diff options
| -rw-r--r-- | nanobox.c | 3073 |
1 files changed, 3073 insertions, 0 deletions
diff --git a/nanobox.c b/nanobox.c new file mode 100644 index 0000000..2298d5a --- /dev/null +++ b/nanobox.c @@ -0,0 +1,3073 @@ +/* vi: set sw=4 ts=4: */ +/* + * nanobox:A small 'nano' clone + * Copyright (C) 2000, 2001 Sterling Huxley <sterling@europa.com> + * Copyright (C) 2019 Michele Bini <michele.bini@gmail.com> + * + * Licensed under GPLv2 or later, see file LICENSE in this source tree. + */ + +/* + * Things To Do: + * add help command + * if mark[] values were line numbers rather than pointers + * it would be easier to change the mark when add/delete lines + * More intelligence in refresh() + * filter text through an external command + * An "ex" line oriented mode- maybe using "cmdedit" + */ + +//config:config NANO +//config: bool "nano" +//config: default y +//config: help +//config: 'nano' is a text editor. This is a clone attempt. +//config: +//config:config FEATURE_NANO_MAX_LEN +//config: int "Maximum screen width" +//config: range 256 16384 +//config: default 4096 +//config: depends on NANO +//config: help +//config: Contrary to what you may think, this is not eating much. +//config: Make it smaller than 4k only if you are very limited on memory. +//config: +//config:config FEATURE_NANO_8BIT +//config: bool "Allow to display 8-bit chars (otherwise shows dots)" +//config: default n +//config: depends on NANO +//config: help +//config: If your terminal can display characters with high bit set, +//config: you may want to enable this. Note: nano is not Unicode-capable. +//config: If your terminal combines several 8-bit bytes into one character +//config: (as in Unicode mode), this will not work properly. +//config: +//config:config FEATURE_NANO_UTF8 +//config: bool "Allow editing utf-8 files" +//config: default y +//config: depends on NANO +//config: help +//config: Allow input of utf8 characters. (EXPERIMENTAL) +//config: +//config:config FEATURE_NANO_UTF8_MIXED +//config: bool "Allow editing of utf-8 files containing invalid character sequences" +//config: default y +//config: depends on NANO_UTF8 +//config: help +//config: Allow input of utf8 characters. (EXPERIMENTAL) +//config: +//config:config FEATURE_NANO_COLON +//config: bool "Enable \":\" colon commands (no \"ex\" mode)" +//config: default y +//config: depends on NANO +//config: help +//config: Enable a limited set of colon commands. This does not +//config: provide an "ex" mode. +//config: +//config:config FEATURE_NANO_YANKMARK +//config: bool "Enable yank/put commands and mark cmds" +//config: default y +//config: depends on NANO +//config: help +//config: This will enable you to use yank and put, as well as mark. +//config: +//config:config FEATURE_NANO_SEARCH +//config: bool "Enable search and replace cmds" +//config: default y +//config: depends on NANO +//config: help +//config: Select this if you wish to be able to do search and replace. +//config: +//config:config FEATURE_NANO_REGEX_SEARCH +//config: bool "Enable regex in search and replace" +//config: default n # Uses GNU regex, which may be unavailable. FIXME +//config: depends on FEATURE_NANO_SEARCH +//config: help +//config: Use extended regex search. +//config: +//config:config FEATURE_NANO_USE_SIGNALS +//config: bool "Catch signals" +//config: default y +//config: depends on NANO +//config: help +//config: Selecting this option will make nano signal aware. This will support +//config: SIGWINCH to deal with Window Changes, catch ^Z and ^C and alarms. +//config: +//config:config FEATURE_NANO_READONLY +//config: bool "Enable -R option and \"view\" mode" +//config: default y +//config: depends on NANO +//config: help +//config: Enable the read-only command line option, which allows the user to +//config: open a file in read-only mode. +//config: +//config:config FEATURE_NANO_SETOPTS +//config: bool "Enable settable options, ai ic showmatch" +//config: default y +//config: depends on NANO +//config: help +//config: Enable the editor to set some (ai, ic, showmatch) options. +//config: Consider removing this option! FIXME +//config: +//config:config FEATURE_NANO_SET +//config: bool "Support :set" +//config: default y +//config: depends on NANO +//config: +//config:config FEATURE_NANO_WIN_RESIZE +//config: bool "Handle window resize" +//config: default y +//config: depends on NANO +//config: help +//config: Behave nicely with terminals that get resized. +//config: +//config:config FEATURE_NANO_ASK_TERMINAL +//config: bool "Use 'tell me cursor position' ESC sequence to measure window" +//config: default y +//config: depends on NANO +//config: help +//config: If terminal size can't be retrieved and $LINES/$COLUMNS are not set, +//config: this option makes nano perform a last-ditch effort to find it: +//config: position cursor to 999,999 and ask terminal to report real +//config: cursor position using "ESC [ 6 n" escape sequence, then read stdin. +//config: This is not clean but helps a lot on serial lines and such. +//config: +//config:config FEATURE_NANO_UNDO +//config: bool "Support undo command \"u\"" +//config: default y +//config: depends on NANO +//config: help +//config: Support the 'u' command to undo insertion, deletion, and replacement +//config: of text. +//config: +//config:config FEATURE_NANO_UNDO_QUEUE +//config: bool "Enable undo operation queuing" +//config: default y +//config: depends on FEATURE_NANO_UNDO +//config: help +//config: The nano undo functions can use an intermediate queue to greatly lower +//config: malloc() calls and overhead. When the maximum size of this queue is +//config: reached, the contents of the queue are committed to the undo stack. +//config: This increases the size of the undo code and allows some undo +//config: operations (especially un-typing/backspacing) to be far more useful. +//config: +//config:config FEATURE_NANO_UNDO_QUEUE_MAX +//config: int "Maximum undo character queue size" +//config: default 256 +//config: range 32 65536 +//config: depends on FEATURE_NANO_UNDO_QUEUE +//config: help +//config: This option sets the number of bytes used at runtime for the queue. +//config: Smaller values will create more undo objects and reduce the amount +//config: of typed or backspaced characters that are grouped into one undo +//config: operation; larger values increase the potential size of each undo +//config: and will generally malloc() larger objects and less frequently. +//config: Unless you want more (or less) frequent "undo points" while typing, +//config: you should probably leave this unchanged. +//config: +//config:config FEATURE_NANO_HIGHLIGHT +//config: bool "Support syntax highlighting" +//config: default y +//config: depends on NANO +//config: help +//config: Support syntax highlighting. +//config: +//config:config FEATURE_NANO_HIGHLIGHT_LANGUAGE_C +//config: bool "Support syntax highlighting for C language" +//config: default y +//config: depends on NANO +//config: help +//config: Support syntax highlighting for the C language +//config: + +//applet:IF_NANO(APPLET(nano, BB_DIR_BIN, BB_SUID_DROP)) + +//kbuild:lib-$(CONFIG_NANO) += nano.o + +//usage:#define nano_trivial_usage +//usage: "[OPTIONS] [FILE]..." +//usage:#define nano_full_usage "\n\n" +//usage: "Edit FILE\n" +//usage: IF_FEATURE_NANO_COLON( +//usage: "\n -c CMD Initial command to run ($EXINIT also available)" +//usage: ) +//usage: IF_FEATURE_NANO_READONLY( +//usage: "\n -R Read-only" +//usage: ) +//usage: "\n -H List available features" + +// #include "libbb.h" + +/* Should be after libbb.h: on some systems regex.h needs sys/types.h: */ +#if ENABLE_FEATURE_NANO_REGEX_SEARCH +# include <regex.h> +#endif + +/* the CRASHME code is unmaintained, and doesn't currently build */ +#define ENABLE_FEATURE_NANO_CRASHME 0 + + +#if ENABLE_LOCALE_SUPPORT + +#if ENABLE_FEATURE_NANO_8BIT +//FIXME: this does not work properly for Unicode anyway +# define Isprint(c) (isprint)(c) +#else +# define Isprint(c) isprint_asciionly(c) +#endif + +#else + +/* 0x9b is Meta-ESC */ +#if ENABLE_FEATURE_NANO_8BIT +# define Isprint(c) ((unsigned char)(c) >= ' ' && (c) != 0x7f && (unsigned char)(c) != 0x9b) +#else +# define Isprint(c) ((unsigned char)(c) >= ' ' && (unsigned char)(c) < 0x7f) +#endif + +#endif + + +enum { + MAX_TABSTOP = 32, // sanity limit + // User input len. Need not be extra big. + // Lines in file being edited *can* be bigger than this. + MAX_INPUT_LEN = 128, + // Sanity limits. We have only one buffer of this size. + MAX_SCR_COLS = CONFIG_FEATURE_NANO_MAX_LEN, + MAX_SCR_ROWS = CONFIG_FEATURE_NANO_MAX_LEN, +}; + +/* VT102 ESC sequences. + * See "Xterm Control Sequences" + * http://invisible-island.net/xterm/ctlseqs/ctlseqs.html + */ +/* Inverse/Normal text */ +#define ESC_BOLD_TEXT "\033[7m" +#define ESC_NORM_TEXT "\033[0m" +/* Bell */ +#define ESC_BELL "\007" +/* Clear-to-end-of-line */ +#define ESC_CLEAR2EOL "\033[K" +/* Clear-to-end-of-screen. + * (We use default param here. + * Full sequence is "ESC [ <num> J", + * <num> is 0/1/2 = "erase below/above/all".) + */ +#define ESC_CLEAR2EOS "\033[J" +/* Cursor to given coordinate (1,1: top left) */ +#define ESC_SET_CURSOR_POS "\033[%u;%uH" +//UNUSED +// /* Cursor up and down */ +//#define ESC_CURSOR_UP "\033[A" +//#define ESC_CURSOR_DOWN "\n" + +#if ENABLE_FEATURE_NANO_YANKMARK +// cmds modifying text[] +// vda: removed "aAiIs" as they switch us into insert mode +// and remembering input for replay after them makes no sense +static const char modifying_cmds[] ALIGN1 = "cCdDJoOpPrRxX<>~"; +#endif + +enum { + YANKONLY = FALSE, + YANKDEL = TRUE, + FORWARD = 1, // code depends on "1" for array index + BACK = -1, // code depends on "-1" for array index + LIMITED = 0, // how much of text[] in char_search + FULL = 1, // how much of text[] in char_search +}; + + +/* nano.c expects chars to be unsigned. */ +/* busybox build system provides that, but it's better */ +/* to audit and fix the source */ + +struct globals { + /* many references - keep near the top of globals */ + char *text, *end; // pointers to the user data in memory + char *dot; // where all the action takes place + int text_size; // size of the allocated buffer + + /* the rest */ + smallint nano_setops; +#define NANO_AUTOINDENT 1 +#define NANO_SHOWMATCH 2 +#define NANO_IGNORECASE 4 +#define NANO_ERR_METHOD 8 +#define autoindent (nano_setops & NANO_AUTOINDENT) +#define showmatch (nano_setops & NANO_SHOWMATCH ) +#define ignorecase (nano_setops & NANO_IGNORECASE) + +#if ENABLE_FEATURE_NANO_READONLY + smallint readonly_mode; +#define SET_READONLY_FILE(flags) ((flags) |= 0x01) +#define SET_READONLY_MODE(flags) ((flags) |= 0x02) +#define UNSET_READONLY_FILE(flags) ((flags) &= 0xfe) +#else +#define SET_READONLY_FILE(flags) ((void)0) +#define SET_READONLY_MODE(flags) ((void)0) +#define UNSET_READONLY_FILE(flags) ((void)0) +#endif + + smallint editing; // >0 while we are editing a file + // [code audit says "can be 0, 1 or 2 only"] + int modified_count; // buffer contents changed if !0 + int last_modified_count; // = -1; + int save_argc; // how many file names on cmd line + unsigned rows, columns; // the terminal screen is this size +#if ENABLE_FEATURE_NANO_ASK_TERMINAL + int get_rowcol_error; +#endif + int crow, ccol; // cursor is on Crow x Ccol + int offset; // chars scrolled off the screen to the left + int have_status_msg; // is default edit status needed? + // [don't make smallint!] + int last_status_cksum; // hash of current status line + char *current_filename; + char *screenbegin; // index into text[], of top line on the screen + char *screen; // pointer to the virtual screen buffer + int screensize; // and its size + int tabstop; + int last_forward_char; // last char searched for with 'f' (int because of Unicode) + char erase_char; // the users erase character + char last_input_char; // last char read from user + +#if ENABLE_FEATURE_NANO_USE_SIGNALS || ENABLE_FEATURE_NANO_CRASHME + int my_pid; +#endif +#if ENABLE_FEATURE_NANO_SEARCH + char *last_search_pattern; // last pattern from a '/' or '?' search +#endif + + /* former statics */ +#if ENABLE_FEATURE_NANO_YANKMARK + char *edit_file__cur_line; +#endif + int refresh__old_offset; + int format_edit_status__tot; + + /* a few references only */ +#if ENABLE_FEATURE_NANO_YANKMARK + // char *reg[28]; // named register a-z, "D", and "U" 0-25,26,27 + char *clipboard; + char *mark[28]; // user marks points somewhere in text[]- a-z and previous context '' + char *context_start, *context_end; +#endif +#if ENABLE_FEATURE_NANO_USE_SIGNALS + sigjmp_buf restart; // catch_sig() +#endif + struct termios term_orig; // remember what the cooked mode was +#if ENABLE_FEATURE_NANO_COLON + char *initial_cmds[3]; // currently 2 entries, NULL terminated +#endif + // Should be just enough to hold a key sequence, + // but CRASHME mode uses it as generated command buffer too +#if ENABLE_FEATURE_NANO_CRASHME + char readbuffer[128]; +#else + char readbuffer[KEYCODE_BUFFER_SIZE]; +#endif +#define STATUS_BUFFER_LEN 200 + char status_buffer[STATUS_BUFFER_LEN]; // messages to the user + char get_input_line__buf[MAX_INPUT_LEN]; + char search__buf[MAX_INPUT_LEN]; + + char scr_out_buf[MAX_SCR_COLS + MAX_TABSTOP * 2]; +#if ENABLE_FEATURE_NANO_UNDO +// undo_push() operations +#define UNDO_INS 0 +#define UNDO_DEL 1 +#define UNDO_INS_CHAIN 2 +#define UNDO_DEL_CHAIN 3 +// UNDO_*_QUEUED must be equal to UNDO_xxx ORed with UNDO_QUEUED_FLAG +#define UNDO_QUEUED_FLAG 4 +#define UNDO_INS_QUEUED 4 +#define UNDO_DEL_QUEUED 5 +#define UNDO_USE_SPOS 32 +#define UNDO_EMPTY 64 +// Pass-through flags for functions that can be undone +#define NO_UNDO 0 +#define ALLOW_UNDO 1 +#define ALLOW_UNDO_CHAIN 2 +# if ENABLE_FEATURE_NANO_UNDO_QUEUE +#define ALLOW_UNDO_QUEUED 3 + char undo_queue_state; + int undo_q; + char *undo_queue_spos; // Start position of queued operation + char undo_queue[CONFIG_FEATURE_NANO_UNDO_QUEUE_MAX]; +# else +// If undo queuing disabled, don't invoke the missing queue logic +#define ALLOW_UNDO_QUEUED 1 +# endif + + struct undo_object { + struct undo_object *prev; // Linking back avoids list traversal (LIFO) + int start; // Offset where the data should be restored/deleted + int length; // total data size + uint8_t u_type; // 0=deleted, 1=inserted, 2=swapped + char undo_text[1]; // text that was deleted (if deletion) + } *undo_stack_tail; +#endif /* ENABLE_FEATURE_NANO_UNDO */ +}; +#define G (*ptr_to_globals) +#define text (G.text ) +#define text_size (G.text_size ) +#define end (G.end ) +#define dot (G.dot ) +#define clipboard (G.clipboard ) + +#define nano_setops (G.nano_setops ) +#define editing (G.editing ) +#define modified_count (G.modified_count ) +#define last_modified_count (G.last_modified_count) +#define save_argc (G.save_argc ) +#define rows (G.rows ) +#define columns (G.columns ) +#define crow (G.crow ) +#define ccol (G.ccol ) +#define offset (G.offset ) +#define status_buffer (G.status_buffer ) +#define have_status_msg (G.have_status_msg ) +#define last_status_cksum (G.last_status_cksum ) +#define current_filename (G.current_filename ) +#define screen (G.screen ) +#define screensize (G.screensize ) +#define screenbegin (G.screenbegin ) +#define tabstop (G.tabstop ) +#define last_forward_char (G.last_forward_char ) +#define erase_char (G.erase_char ) +#define last_input_char (G.last_input_char ) +#if ENABLE_FEATURE_NANO_READONLY +#define readonly_mode (G.readonly_mode ) +#else +#define readonly_mode 0 +#endif +#define adding2q (G.adding2q ) +#define lmc_len (G.lmc_len ) +#define ioq (G.ioq ) +#define ioq_start (G.ioq_start ) +#define my_pid (G.my_pid ) +#define last_search_pattern (G.last_search_pattern) + +#define edit_file__cur_line (G.edit_file__cur_line) +#define refresh__old_offset (G.refresh__old_offset) +#define format_edit_status__tot (G.format_edit_status__tot) + +#define mark (G.mark ) +#define context_start (G.context_start ) +#define context_end (G.context_end ) +#define restart (G.restart ) +#define term_orig (G.term_orig ) +#define initial_cmds (G.initial_cmds ) +#define readbuffer (G.readbuffer ) +#define scr_out_buf (G.scr_out_buf ) +#define last_modifying_cmd (G.last_modifying_cmd ) +#define get_input_line__buf (G.get_input_line__buf) +#define search__buf (G.search__buf) + +#if ENABLE_FEATURE_NANO_UNDO +#define undo_stack_tail (G.undo_stack_tail ) +# if ENABLE_FEATURE_NANO_UNDO_QUEUE +#define undo_queue_state (G.undo_queue_state) +#define undo_q (G.undo_q ) +#define undo_queue (G.undo_queue ) +#define undo_queue_spos (G.undo_queue_spos ) +# endif +#endif + +#define INIT_G() do { \ + SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ + last_modified_count = -1; \ + /* "" but has space for 2 chars: */ \ + IF_FEATURE_NANO_SEARCH(last_search_pattern = xzalloc(2);) \ +} while (0) + + +static void edit_file(char *); // edit one file +static void do_cmd(int); // execute a command +static int next_tabstop(int); +static void sync_cursor(char *, int *, int *); // synchronize the screen cursor to dot +static char *begin_line(char *); // return pointer to cur line B-o-l +static char *end_line(char *); // return pointer to cur line E-o-l +static char *prev_line(char *); // return pointer to prev line B-o-l +static char *next_line(char *); // return pointer to next line B-o-l +static char *end_screen(void); // get pointer to last char on screen +static int count_lines(char *, char *); // count line from start to stop +static char *move_to_col(char *, int); // move "p" to column l +static void dot_left(void); // move dot left- dont leave line +static void dot_right(void); // move dot right- dont leave line +static void dot_begin(void); // move dot to B-o-l +static void dot_next(void); // move dot to next line B-o-l +static void dot_prev(void); // move dot to prev line B-o-l +static void dot_scroll(int, int); // move the screen up or down +static void dot_skip_over_ws(void); // move dot pat WS +static char *bound_dot(char *); // make sure text[0] <= P < "end" +static char *new_screen(int, int); // malloc virtual screen memory +#if !ENABLE_FEATURE_NANO_UNDO +#define char_insert(a,b,c) char_insert(a,b) +#endif +static char *char_insert(char *, char, int); // insert the char c at 'p' +// might reallocate text[]! use p += stupid_insert(p, ...), +// and be careful to not use pointers into potentially freed text[]! +static uintptr_t stupid_insert(char *, char); // stupidly insert the char c at 'p' +static char *find_pair(char *, char); // find matching pair () [] {} +#if !ENABLE_FEATURE_NANO_UNDO +#define text_hole_delete(a,b,c) text_hole_delete(a,b) +#endif +static char *text_hole_delete(char *, char *, int); // at "p", delete a 'size' byte hole +// might reallocate text[]! use p += text_hole_make(p, ...), +// and be careful to not use pointers into potentially freed text[]! +static uintptr_t text_hole_make(char *, int); // at "p", make a 'size' byte hole +#if !ENABLE_FEATURE_NANO_UNDO +#define yank_delete(a,b,c,d,e) yank_delete(a,b,c,d) +#endif +static char *yank_delete(char *, char *, int, int, int); // yank text[] into register then delete +static void show_help(void); // display some help info +static void rawmode(void); // set "raw" mode on tty +static void cookmode(void); // return to "cooked" mode on tty +// sleep for 'h' 1/100 seconds, return 1/0 if stdin is (ready for read)/(not ready) +static int mysleep(int); +static int get_one_char(void); // read 1 char from stdin +// file_insert might reallocate text[]! +static int file_insert(const char *, char *, int); +static int file_write(char *, char *, char *); +static void place_cursor(int, int); +static void screen_erase(void); +static void clear_to_eol(void); +static void clear_to_eos(void); +static void go_bottom_and_clear_to_eol(void); +static void standout_start(void); // send "start reverse video" sequence +static void standout_end(void); // send "end reverse video" sequence +static void show_status_line(void); // put a message on the bottom line +static void status_line(const char *, ...); // print to status buf +static void status_line_bold(const char *, ...); +static void status_line_bold_errno(const char *fn); +static void not_implemented(const char *); // display "Not implemented" message +static int format_edit_status(void); // format file status on status line +static void redraw(int); // force a full screen refresh +static char* format_line(char* /*, int*/); +static void refresh(int); // update the terminal from screen[] + +static void indicate_error(void); // beep to indicate error +static void Hit_Return(void); + +#if ENABLE_FEATURE_NANO_USE_SIGNALS +static void winch_sig(int); // catch window size changes +static void suspend_sig(int); // catch ctrl-Z +static void catch_sig(int); // catch ctrl-C and alarm time-outs +#endif +#define end_cmd_q() ((void)0) +#if ENABLE_FEATURE_NANO_SETOPTS +static void showmatching(char *); // show the matching pair () [] {} +#endif +#if ENABLE_FEATURE_NANO_YANKMARK || (ENABLE_FEATURE_NANO_COLON && ENABLE_FEATURE_NANO_SEARCH) || ENABLE_FEATURE_NANO_CRASHME +// might reallocate text[]! use p += string_insert(p, ...), +// and be careful to not use pointers into potentially freed text[]! +# if !ENABLE_FEATURE_NANO_UNDO +#define string_insert(a,b,c) string_insert(a,b) +# endif +static uintptr_t string_insert(char *, const char *, int); // insert the string at 'p' +#endif +#if ENABLE_FEATURE_NANO_YANKMARK +static char *text_yank(char *, char *); // save copy of "p" into a register +static void check_context(char); // remember context for '' command +static int yank_append = 0; +static int previous_yank_position = -1; +#endif +#if ENABLE_FEATURE_NANO_UNDO +static void flush_undo_data(void); +static void undo_push(char *, unsigned int, unsigned char); // Push an operation on the undo stack +static void undo_pop(void); // Undo the last operation +# if ENABLE_FEATURE_NANO_UNDO_QUEUE +static void undo_queue_commit(void); // Flush any queued objects to the undo stack +# else +# define undo_queue_commit() ((void)0) +# endif +#else +#define flush_undo_data() ((void)0) +#define undo_queue_commit() ((void)0) +#endif + +#if ENABLE_FEATURE_NANO_CRASHME +static void crash_dummy(); +static void crash_test(); +static int crashme = 0; +#endif + +#if ENABLE_FEATURE_NANO_HIGHLIGHT +#endif + +static void write1(const char *out) +{ + fputs(out, stdout); +} + +int nano_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int nano_main(int argc, char **argv) +{ + int c; + + INIT_G(); + +#if ENABLE_FEATURE_NANO_UNDO + /* undo_stack_tail = NULL; - already is */ +#if ENABLE_FEATURE_NANO_UNDO_QUEUE + undo_queue_state = UNDO_EMPTY; + /* undo_q = 0; - already is */ +#endif +#endif + +#if ENABLE_FEATURE_NANO_USE_SIGNALS || ENABLE_FEATURE_NANO_CRASHME + my_pid = getpid(); +#endif +#if ENABLE_FEATURE_NANO_CRASHME + srand((long) my_pid); +#endif +#ifdef NO_SUCH_APPLET_YET + /* If we aren't "nano", we are "view" */ + if (ENABLE_FEATURE_NANO_READONLY && applet_name[2]) { + SET_READONLY_MODE(readonly_mode); + } +#endif + + // autoindent is not default in vi 7.3 + nano_setops = /*NANO_AUTOINDENT |*/ NANO_SHOWMATCH | NANO_IGNORECASE; + // 1- process $HOME/.exrc file (not inplemented yet) + // 2- process EXINIT variable from environment + // 3- process command line args +#if ENABLE_FEATURE_NANO_COLON + { + char *p = getenv("EXINIT"); + if (p && *p) + initial_cmds[0] = xstrndup(p, MAX_INPUT_LEN); + } +#endif + while ((c = getopt(argc, argv, "hCRH" IF_FEATURE_NANO_COLON("c:"))) != -1) { + switch (c) { +#if ENABLE_FEATURE_NANO_CRASHME + case 'C': + crashme = 1; + break; +#endif +#if ENABLE_FEATURE_NANO_READONLY + case 'R': // Read-only flag + SET_READONLY_MODE(readonly_mode); + break; +#endif +#if ENABLE_FEATURE_NANO_COLON + case 'c': // cmd line nano command + if (*optarg) + initial_cmds[initial_cmds[0] != NULL] = xstrndup(optarg, MAX_INPUT_LEN); + break; +#endif + case 'H': + show_help(); + /* fall through */ + default: + bb_show_usage(); + return 1; + } + } + + // The argv array can be used by the ":next" and ":rewind" commands + argv += optind; + argc -= optind; + + //----- This is the main file handling loop -------------- + save_argc = argc; + optind = 0; + // "Save cursor, use alternate screen buffer, clear screen" + write1("\033[?1049h"); + while (1) { + edit_file(argv[optind]); /* param might be NULL */ + if (++optind >= argc) + break; + } + // "Use normal screen buffer, restore cursor" + write1("\033[?1049l"); + //----------------------------------------------------------- + + return 0; +} + +/* read text from file or create an empty buf */ +/* will also update current_filename */ +static int init_text_buffer(char *fn) +{ + int rc; + + /* allocate/reallocate text buffer */ + free(text); + text_size = 10240; + screenbegin = dot = end = text = xzalloc(text_size); + + if (fn != current_filename) { + free(current_filename); + current_filename = xstrdup(fn); + } + rc = file_insert(fn, text, 1); + if (rc < 0) { + // file doesnt exist. Start empty buf with dummy line + char_insert(text, '\n', NO_UNDO); + } + + flush_undo_data(); + modified_count = 0; + last_modified_count = -1; +#if ENABLE_FEATURE_NANO_YANKMARK + /* init the marks */ + memset(mark, 0, sizeof(mark)); +#endif + return rc; +} + +#if ENABLE_FEATURE_NANO_WIN_RESIZE +static int query_screen_dimensions(void) +{ + int err = get_terminal_width_height(STDIN_FILENO, &columns, &rows); + if (rows > MAX_SCR_ROWS) + rows = MAX_SCR_ROWS; + if (columns > MAX_SCR_COLS) + columns = MAX_SCR_COLS; + return err; +} +#else +# define query_screen_dimensions() (0) +#endif + +static void edit_file(char *fn) +{ +#if ENABLE_FEATURE_NANO_YANKMARK +#define cur_line edit_file__cur_line +#endif + int c; +#if ENABLE_FEATURE_NANO_USE_SIGNALS + int sig; +#endif + + editing = 1; // 0 = exit, 1 = one file, 2 = multiple files + rawmode(); + rows = 24; + columns = 80; + IF_FEATURE_NANO_ASK_TERMINAL(G.get_rowcol_error =) query_screen_dimensions(); +#if ENABLE_FEATURE_NANO_ASK_TERMINAL + if (G.get_rowcol_error /* TODO? && no input on stdin */) { + uint64_t k; + write1("\033[999;999H" "\033[6n"); + fflush_all(); + k = read_key(STDIN_FILENO, readbuffer, /*timeout_ms:*/ 100); + if ((int32_t)k == KEYCODE_CURSOR_POS) { + uint32_t rc = (k >> 32); + columns = (rc & 0x7fff); + if (columns > MAX_SCR_COLS) + columns = MAX_SCR_COLS; + rows = ((rc >> 16) & 0x7fff); + if (rows > MAX_SCR_ROWS) + rows = MAX_SCR_ROWS; + } + } +#endif + new_screen(rows, columns); // get memory for virtual screen + init_text_buffer(fn); + +#if ENABLE_FEATURE_NANO_YANKMARK + mark[26] = mark[27] = text; // init "previous context" +#endif + + last_forward_char = last_input_char = '\0'; + crow = 0; + ccol = 0; + +#if ENABLE_FEATURE_NANO_USE_SIGNALS + signal(SIGINT, catch_sig); + signal(SIGWINCH, winch_sig); + signal(SIGTSTP, suspend_sig); + sig = sigsetjmp(restart, 1); + if (sig != 0) { + screenbegin = dot = text; + } +#endif + + tabstop = 8; + offset = 0; // no horizontal offset + c = '\0'; + + redraw(FALSE); // dont force every col re-draw + //------This is the main Nano cmd handling loop ----------------------- + while (editing > 0) { +#if ENABLE_FEATURE_NANO_CRASHME + if (crashme > 0) { + if ((end - text) > 1) { + crash_dummy(); // generate a random command + } else { + crashme = 0; + string_insert(text, "\n\n##### Ran out of text to work on. #####\n\n", NO_UNDO); // insert the string + dot = text; + refresh(FALSE); + } + } +#endif + last_input_char = c = get_one_char(); // get a cmd from user + do_cmd(c); // execute the user command + + // poll to see if there is input already waiting. if we are + // not able to display output fast enough to keep up, skip + // the display update until we catch up with input. + if (!readbuffer[0] && mysleep(0) == 0) { + // no input pending - so update output + refresh(FALSE); + show_status_line(); + } +#if ENABLE_FEATURE_NANO_CRASHME + if (crashme > 0) + crash_test(); // test editor variables +#endif + } + //------------------------------------------------------------------- + + go_bottom_and_clear_to_eol(); + cookmode(); +#undef cur_line +} + +static void Hit_Return(void) +{ + int c; + + standout_start(); + write1("[Hit return to continue]"); + standout_end(); + while ((c = get_one_char()) != '\n' && c != '\r') + continue; + redraw(TRUE); // force redraw all +} + +static int next_tabstop(int col) +{ + return col + ((tabstop - 1) - (col % tabstop)); +} + +#if ENABLE_FEATURE_NANO_UTF8 +static int utf8_char_len(unsigned char c) +{ + return + (c & 0x40) ? + ((c & 0x20) ? + ((c & 0x10) ? + ((c & 0x8) ? 1 : 4) + : 3) + : 2) + : 1; +} +#endif + +//----- Synchronize the cursor to Dot -------------------------- +static NOINLINE void sync_cursor(char *d, int *row, int *col) +{ + char *beg_cur; // begin and end of "d" line + char *tp; + int cnt, ro, co; + + beg_cur = begin_line(d); // first char of cur line + + if (beg_cur < screenbegin) { + // "d" is before top line on screen + // how many lines do we have to move + cnt = count_lines(beg_cur, screenbegin); + sc1: + screenbegin = beg_cur; + if (cnt > (rows - 1) / 2) { + // we moved too many lines. put "dot" in middle of screen + for (cnt = 0; cnt < (rows - 1) / 2; cnt++) { + screenbegin = prev_line(screenbegin); + } + } + } else { + char *end_scr; // begin and end of screen + end_scr = end_screen(); // last char of screen + if (beg_cur > end_scr) { + // "d" is after bottom line on screen + // how many lines do we have to move + cnt = count_lines(end_scr, beg_cur); + if (cnt > (rows - 1) / 2) + goto sc1; // too many lines + for (ro = 0; ro < cnt - 1; ro++) { + // move screen begin the same amount + screenbegin = next_line(screenbegin); + // now, move the end of screen + end_scr = next_line(end_scr); + end_scr = end_line(end_scr); + } + } + } + // "d" is on screen- find out which row + tp = screenbegin; + for (ro = 0; ro < rows - 1; ro++) { // drive "ro" to correct row + if (tp == beg_cur) + break; + tp = next_line(tp); + } + + // find out what col "d" is on + co = 0; + while (tp < d) { // drive "co" to correct column + if (*tp == '\n') //vda || *tp == '\0') + break; + if (*tp == '\t') { + // handle tabs like real nano + if (d == tp) { + break; + } + co = next_tabstop(co); + } else if ((unsigned char)*tp < ' ' || *tp == 0x7f) { + co++; // display as ^X, use 2 columns +#if ENABLE_FEATURE_NANO_UTF8 + } else if (*tp & 0x80) { +#if ENABLE_FEATURE_NANO_UTF8_MIXED + char *tp_orig = tp; + int char_len = utf8_char_len(*tp) - 1; + do { + tp++; + if ((*tp & 0xC0) != 0x80) { + tp = tp_orig; + break; + } + if (!(--char_len > 0)) break; + if (!(tp < d)) { + tp = tp_orig; + break; + } + } while (1); +#else + int char_len = utf8_char_len(*tp) - 1; + do { tp++; } while (tp < d && (--char_len > 0)); +#endif +#endif + } + co++; + tp++; + } + + // "co" is the column where "dot" is. + // The screen has "columns" columns. + // The currently displayed columns are 0+offset -- columns+ofset + // |-------------------------------------------------------------| + // ^ ^ ^ + // offset | |------- columns ----------------| + // + // If "co" is already in this range then we do not have to adjust offset + // but, we do have to subtract the "offset" bias from "co". + // If "co" is outside this range then we have to change "offset". + // If the first char of a line is a tab the cursor will try to stay + // in column 7, but we have to set offset to 0. + + if (co < 0 + offset) { + offset = co; + } + if (co >= columns + offset) { + offset = co - columns + 1; + } + // if the first char of the line is a tab, and "dot" is sitting on it + // force offset to 0. + if (d == beg_cur && *d == '\t') { + offset = 0; + } + co -= offset; + + *row = ro; + *col = co; +} + +//----- Text Movement Routines --------------------------------- +static char *begin_line(char *p) // return pointer to first char cur line +{ + if (p > text) { + p = memrchr(text, '\n', p - text); + if (!p) + return text; + return p + 1; + } + return p; +} + +static char *end_line(char *p) // return pointer to NL of cur line +{ + if (p < end - 1) { + p = memchr(p, '\n', end - p - 1); + if (!p) + return end - 1; + } + return p; +} + +static char *prev_line(char *p) // return pointer first char prev line +{ + p = begin_line(p); // goto beginning of cur line + if (p > text && p[-1] == '\n') + p--; // step to prev line + p = begin_line(p); // goto beginning of prev line + return p; +} + +static char *next_line(char *p) // return pointer first char next line +{ + p = end_line(p); + if (p < end - 1 && *p == '\n') + p++; // step to next line + return p; +} + +//----- Text Information Routines ------------------------------ +static char *end_screen(void) +{ + char *q; + int cnt; + + // find new bottom line + q = screenbegin; + for (cnt = 0; cnt < rows - 2; cnt++) + q = next_line(q); + q = end_line(q); + return q; +} + +// count line from start to stop +static int count_lines(char *start, char *stop) +{ + char *q; + int cnt; + + if (stop < start) { // start and stop are backwards- reverse them + q = start; + start = stop; + stop = q; + } + cnt = 0; + stop = end_line(stop); + while (start <= stop && start <= end - 1) { + start = end_line(start); + if (*start == '\n') + cnt++; + start++; + } + return cnt; +} + +//----- Dot Movement Routines ---------------------------------- +static void dot_left(void) +{ + undo_queue_commit(); +#if 0 + // Vi-like movement + if (dot > text && dot[-1] != '\n') + dot--; +#else + if (dot > text) dot--; +#if ENABLE_FEATURE_NANO_UTF8 + if (*dot & 0x80) { + char *utf8_char_start = dot; +#if ENABLE_FEATURE_NANO_UTF8_MIXED + do { + if (*utf8_char_start & 0x40) break; + if (utf8_char_start <= text) goto unrecognized_utf8_code; + utf8_char_start--; + if (!(*utf8_char_start & 0x80)) goto unrecognized_utf8_code; + if (dot - utf8_char_start > 3) goto unrecognized_utf8_code; + } while (1); + if (utf8_char_len(*utf8_char_start) == (dot - utf8_char_start + 1)) { + dot = utf8_char_start; + } +#else + do { + if (*utf8_char_start & 0x40) break; + if (utf8_char_start <= text) goto unrecognized_utf8_code; + utf8_char_start--; + } while (1); + dot = utf8_char_start; +#endif + unrecognized_utf8_code: ; + } +#endif +#endif +} + +static void dot_right(void) +{ + undo_queue_commit(); +#if 0 + // Vi-like movement + if (dot < end - 1 && *dot != '\n') + dot++; +#else +#if ENABLE_FEATURE_NANO_UTF8 + if (*dot & 0x80) { +#if ENABLE_FEATURE_NANO_UTF8_MIXED + char *orig_dot = dot; + int char_len = utf8_char_len(*dot); + while (dot < end - 1 && --char_len > 0) { + dot++; + if (*dot & 0xC0 != 0x80) { + dot = orig_dot; + break; + } + } +#else + int char_len = utf8_char_len(*dot); + while (dot < end - 1 && --char_len > 0) dot++; +#endif + } +#endif + if (dot < end - 1) dot++; +#endif +} + +static void dot_begin(void) +{ + undo_queue_commit(); + dot = begin_line(dot); // return pointer to first char cur line +} + +static char *move_to_col(char *p, int l) +{ + int co; + + p = begin_line(p); + co = 0; + while (co < l && p < end) { + if (*p == '\n') //vda || *p == '\0') + break; + if (*p == '\t') { + co = next_tabstop(co); + } else if (*p < ' ' || *p == 127) { + co++; // display as ^X, use 2 columns + } + co++; + p++; + } + return p; +} + +static void dot_next(void) +{ + undo_queue_commit(); + dot = next_line(dot); +} + +static void dot_prev(void) +{ + undo_queue_commit(); + dot = prev_line(dot); +} + +static void dot_scroll(int cnt, int dir) +{ + char *q; + + undo_queue_commit(); + for (; cnt > 0; cnt--) { + if (dir < 0) { + // scroll Backwards + // ctrl-Y scroll up one line + screenbegin = prev_line(screenbegin); + } else { + // scroll Forwards + // ctrl-E scroll down one line + screenbegin = next_line(screenbegin); + } + } + // make sure "dot" stays on the screen so we dont scroll off + if (dot < screenbegin) + dot = screenbegin; + q = end_screen(); // find new bottom line + if (dot > q) + dot = begin_line(q); // is dot is below bottom line? + dot_skip_over_ws(); +} + +static void dot_skip_over_ws(void) +{ + // skip WS + while (isspace(*dot) && *dot != '\n' && dot < end - 1) + dot++; +} + +static char *bound_dot(char *p) // make sure text[0] <= P < "end" +{ + if (p >= end && end > text) { + p = end - 1; + indicate_error(); + } + if (p < text) { + p = text; + indicate_error(); + } + return p; +} + +//----- Helper Utility Routines -------------------------------- + +//---------------------------------------------------------------- +//----- Char Routines -------------------------------------------- +/* Chars that are part of a word- + * 0123456789_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz + * Chars that are Not part of a word (stoppers) + * !"#$%&'()*+,-./:;<=>?@[\]^`{|}~ + * Chars that are WhiteSpace + * TAB NEWLINE VT FF RETURN SPACE + * DO NOT COUNT NEWLINE AS WHITESPACE + */ + +static char *new_screen(int ro, int co) +{ + int li; + + free(screen); + screensize = ro * co + 8; + screen = xmalloc(screensize); + // initialize the new screen. assume this will be a empty file. + screen_erase(); + // non-existent text[] lines start with a tilde (~). + for (li = 1; li < ro - 1; li++) { + screen[(li * co) + 0] = '~'; + } + return screen; +} + +#if ENABLE_FEATURE_NANO_SEARCH + +# if ENABLE_FEATURE_NANO_REGEX_SEARCH + +# else + +# if ENABLE_FEATURE_NANO_SETOPTS +static int mycmp(const char *s1, const char *s2, int len) +{ + if (ignorecase) { + return strncasecmp(s1, s2, len); + } + return strncmp(s1, s2, len); +} +# else +# define mycmp strncmp +# endif + +# endif + +#endif /* FEATURE_NANO_SEARCH */ + +#define CTRL_CODE(x) (1+x-'A') + +static char *char_insert(char *p, char c, int undo) // insert the char c at 'p' +{ + switch (c) { + case CTRL_CODE('V'): + p += stupid_insert(p, '^'); // use ^ to indicate literal next + refresh(FALSE); // show the ^ + c = get_one_char(); + *p = c; +#if ENABLE_FEATURE_NANO_UNDO + switch (undo) { + case ALLOW_UNDO: + undo_push(p, 1, UNDO_INS); + break; + case ALLOW_UNDO_CHAIN: + undo_push(p, 1, UNDO_INS_CHAIN); + break; +# if ENABLE_FEATURE_NANO_UNDO_QUEUE + case ALLOW_UNDO_QUEUED: + undo_push(p, 1, UNDO_INS_QUEUED); + break; +# endif + } +#else + modified_count++; +#endif /* ENABLE_FEATURE_NANO_UNDO */ + p++; + break; +#if 0 + // Vi specific + case 27: // Is this an ESC? + cmd_mode = 0; + undo_queue_commit(); + end_cmd_q(); // stop adding to q + last_status_cksum = 0; // force status update + if ((p[-1] != '\n') && (dot > text)) { + p--; + } + break; +#endif + case 8: case 127: + backspace: + if (p > text) { + p--; + p = text_hole_delete(p, p, ALLOW_UNDO_QUEUED); // shrink buffer 1 char + } + break; + default: + if (c == erase_char) goto backspace; + // insert a char into text[] + if (c == 13) + c = '\n'; // translate \r to \n +#if ENABLE_FEATURE_NANO_UNDO +# if ENABLE_FEATURE_NANO_UNDO_QUEUE + if (c == '\n') + undo_queue_commit(); +# endif + switch (undo) { + case ALLOW_UNDO: + undo_push(p, 1, UNDO_INS); + break; + case ALLOW_UNDO_CHAIN: + undo_push(p, 1, UNDO_INS_CHAIN); + break; +# if ENABLE_FEATURE_NANO_UNDO_QUEUE + case ALLOW_UNDO_QUEUED: + undo_push(p, 1, UNDO_INS_QUEUED); + break; +# endif + } +#else + modified_count++; +#endif /* ENABLE_FEATURE_NANO_UNDO */ + p += 1 + stupid_insert(p, c); // insert the char +#if 0&&ENABLE_FEATURE_NANO_UTF8 + // Causes segfault! + if (c & 0x80) { + int utf8_len = utf8_char_len(c); + while (--utf8_len > 0) { + c = get_one_char(); + p += 1 + stupid_insert(p, c); // this may break undo? FIXME + } + c = 0; + } +#endif +#if ENABLE_FEATURE_NANO_SETOPTS + if (showmatch && strchr(")]}", c) != NULL) { + showmatching(p - 1); + } + if (autoindent && c == '\n') { // auto indent the new line + char *q; + size_t len; + q = prev_line(p); // use prev line as template + len = strspn(q, " \t"); // space or tab + if (len) { + uintptr_t bias; + bias = text_hole_make(p, len); + p += bias; + q += bias; +#if ENABLE_FEATURE_NANO_UNDO + undo_push(p, len, UNDO_INS); +#endif + memcpy(p, q, len); + p += len; + } + } +#endif + } + return p; +} + +// might reallocate text[]! use p += stupid_insert(p, ...), +// and be careful to not use pointers into potentially freed text[]! +static uintptr_t stupid_insert(char *p, char c) // stupidly insert the char c at 'p' +{ + uintptr_t bias; + bias = text_hole_make(p, 1); + p += bias; + *p = c; + return bias; +} + +// find matching char of pair () [] {} +// will crash if c is not one of these +static char *find_pair(char *p, const char c) +{ + const char *braces = "()[]{}"; + char match; + int dir, level; + + dir = strchr(braces, c) - braces; + dir ^= 1; + match = braces[dir]; + dir = ((dir & 1) << 1) - 1; /* 1 for ([{, -1 for )\} */ + + // look for match, count levels of pairs (( )) + level = 1; + for (;;) { + p += dir; + if (p < text || p >= end) + return NULL; + if (*p == c) + level++; // increase pair levels + if (*p == match) { + level--; // reduce pair level + if (level == 0) + return p; // found matching pair + } + } +} + +#if ENABLE_FEATURE_NANO_SETOPTS +// show the matching char of a pair, () [] {} +static void showmatching(char *p) +{ + char *q, *save_dot; + + // we found half of a pair + q = find_pair(p, *p); // get loc of matching char + if (q == NULL) { + indicate_error(); // no matching char + } else { + // "q" now points to matching pair + save_dot = dot; // remember where we are + dot = q; // go to new loc + refresh(FALSE); // let the user see it + mysleep(40); // give user some time + dot = save_dot; // go back to old loc + refresh(FALSE); + } +} +#endif /* FEATURE_NANO_SETOPTS */ + +#if ENABLE_FEATURE_NANO_UNDO +static void flush_undo_data(void) +{ + struct undo_object *undo_entry; + + while (undo_stack_tail) { + undo_entry = undo_stack_tail; + undo_stack_tail = undo_entry->prev; + free(undo_entry); + } +} + +// Undo functions and hooks added by Jody Bruchon (jody@jodybruchon.com) +static void undo_push(char *src, unsigned int length, uint8_t u_type) // Add to the undo stack +{ + struct undo_object *undo_entry; + + // "u_type" values + // UNDO_INS: insertion, undo will remove from buffer + // UNDO_DEL: deleted text, undo will restore to buffer + // UNDO_{INS,DEL}_CHAIN: Same as above but also calls undo_pop() when complete + // The CHAIN operations are for handling multiple operations that the user + // performs with a single action, i.e. REPLACE mode or find-and-replace commands + // UNDO_{INS,DEL}_QUEUED: If queuing feature is enabled, allow use of the queue + // for the INS/DEL operation. The raw values should be equal to the values of + // UNDO_{INS,DEL} ORed with UNDO_QUEUED_FLAG + +#if ENABLE_FEATURE_NANO_UNDO_QUEUE + // This undo queuing functionality groups multiple character typing or backspaces + // into a single large undo object. This greatly reduces calls to malloc() for + // single-character operations while typing and has the side benefit of letting + // an undo operation remove chunks of text rather than a single character. + switch (u_type) { + case UNDO_EMPTY: // Just in case this ever happens... + return; + case UNDO_DEL_QUEUED: + if (length != 1) + return; // Only queue single characters + switch (undo_queue_state) { + case UNDO_EMPTY: + undo_queue_state = UNDO_DEL; + case UNDO_DEL: + undo_queue_spos = src; + undo_q++; + undo_queue[CONFIG_FEATURE_NANO_UNDO_QUEUE_MAX - undo_q] = *src; + // If queue is full, dump it into an object + if (undo_q == CONFIG_FEATURE_NANO_UNDO_QUEUE_MAX) + undo_queue_commit(); + return; + case UNDO_INS: + // Switch from storing inserted text to deleted text + undo_queue_commit(); + undo_push(src, length, UNDO_DEL_QUEUED); + return; + } + break; + case UNDO_INS_QUEUED: + if (length != 1) + return; + switch (undo_queue_state) { + case UNDO_EMPTY: + undo_queue_state = UNDO_INS; + undo_queue_spos = src; + case UNDO_INS: + undo_q++; // Don't need to save any data for insertions + if (undo_q == CONFIG_FEATURE_NANO_UNDO_QUEUE_MAX) + undo_queue_commit(); + return; + case UNDO_DEL: + // Switch from storing deleted text to inserted text + undo_queue_commit(); + undo_push(src, length, UNDO_INS_QUEUED); + return; + } + break; + } +#else + // If undo queuing is disabled, ignore the queuing flag entirely + u_type = u_type & ~UNDO_QUEUED_FLAG; +#endif + + // Allocate a new undo object + if (u_type == UNDO_DEL || u_type == UNDO_DEL_CHAIN) { + // For UNDO_DEL objects, save deleted text + if ((src + length) == end) + length--; + // If this deletion empties text[], strip the newline. When the buffer becomes + // zero-length, a newline is added back, which requires this to compensate. + undo_entry = xzalloc(offsetof(struct undo_object, undo_text) + length); + memcpy(undo_entry->undo_text, src, length); + } else { + undo_entry = xzalloc(sizeof(*undo_entry)); + } + undo_entry->length = length; +#if ENABLE_FEATURE_NANO_UNDO_QUEUE + if ((u_type & UNDO_USE_SPOS) != 0) { + undo_entry->start = undo_queue_spos - text; // use start position from queue + } else { + undo_entry->start = src - text; // use offset from start of text buffer + } + u_type = (u_type & ~UNDO_USE_SPOS); +#else + undo_entry->start = src - text; +#endif + undo_entry->u_type = u_type; + + // Push it on undo stack + undo_entry->prev = undo_stack_tail; + undo_stack_tail = undo_entry; + modified_count++; +} + +static void undo_pop(void) // Undo the last operation +{ + int repeat; + char *u_start, *u_end; + struct undo_object *undo_entry; + + // Commit pending undo queue before popping (should be unnecessary) + undo_queue_commit(); + + undo_entry = undo_stack_tail; + // Check for an empty undo stack + if (!undo_entry) { + status_line("Already at oldest change"); + return; + } + + switch (undo_entry->u_type) { + case UNDO_DEL: + case UNDO_DEL_CHAIN: + // make hole and put in text that was deleted; deallocate text + u_start = text + undo_entry->start; + text_hole_make(u_start, undo_entry->length); + memcpy(u_start, undo_entry->undo_text, undo_entry->length); + status_line("Undo [%d] %s %d chars at position %d", + modified_count, "restored", + undo_entry->length, undo_entry->start + ); + break; + case UNDO_INS: + case UNDO_INS_CHAIN: + // delete what was inserted + u_start = undo_entry->start + text; + u_end = u_start - 1 + undo_entry->length; + text_hole_delete(u_start, u_end, NO_UNDO); + status_line("Undo [%d] %s %d chars at position %d", + modified_count, "deleted", + undo_entry->length, undo_entry->start + ); + break; + } + repeat = 0; + switch (undo_entry->u_type) { + // If this is the end of a chain, lower modification count and refresh display + case UNDO_DEL: + case UNDO_INS: + dot = (text + undo_entry->start); + refresh(FALSE); + break; + case UNDO_DEL_CHAIN: + case UNDO_INS_CHAIN: + repeat = 1; + break; + } + // Deallocate the undo object we just processed + undo_stack_tail = undo_entry->prev; + free(undo_entry); + modified_count--; + // For chained operations, continue popping all the way down the chain. + if (repeat) { + undo_pop(); // Follow the undo chain if one exists + } +} + +#if ENABLE_FEATURE_NANO_UNDO_QUEUE +static void undo_queue_commit(void) // Flush any queued objects to the undo stack +{ + // Pushes the queue object onto the undo stack + if (undo_q > 0) { + // Deleted character undo events grow from the end + undo_push(undo_queue + CONFIG_FEATURE_NANO_UNDO_QUEUE_MAX - undo_q, + undo_q, + (undo_queue_state | UNDO_USE_SPOS) + ); + undo_queue_state = UNDO_EMPTY; + undo_q = 0; + } +} +#endif + +#endif /* ENABLE_FEATURE_NANO_UNDO */ + +// open a hole in text[] +// might reallocate text[]! use p += text_hole_make(p, ...), +// and be careful to not use pointers into potentially freed text[]! +static uintptr_t text_hole_make(char *p, int size) // at "p", make a 'size' byte hole +{ + uintptr_t bias = 0; + + if (size <= 0) + return bias; + end += size; // adjust the new END + if (end >= (text + text_size)) { + char *new_text; + text_size += end - (text + text_size) + 10240; + new_text = xrealloc(text, text_size); + bias = (new_text - text); + screenbegin += bias; + dot += bias; + end += bias; + p += bias; +#if ENABLE_FEATURE_NANO_YANKMARK + { + int i; + for (i = 0; i < ARRAY_SIZE(mark); i++) + if (mark[i]) + mark[i] += bias; + } +#endif + text = new_text; + } + memmove(p + size, p, end - size - p); + memset(p, ' ', size); // clear new hole + return bias; +} + +// close a hole in text[] +// "undo" value indicates if this operation should be undo-able +static char *text_hole_delete(char *p, char *q, int undo) // delete "p" through "q", inclusive +{ + char *src, *dest; + int cnt, hole_size; + + // move forwards, from beginning + // assume p <= q + src = q + 1; + dest = p; + if (q < p) { // they are backward- swap them + src = p + 1; + dest = q; + } + hole_size = q - p + 1; + cnt = end - src; +#if ENABLE_FEATURE_NANO_UNDO + switch (undo) { + case NO_UNDO: + break; + case ALLOW_UNDO: + undo_push(p, hole_size, UNDO_DEL); + break; + case ALLOW_UNDO_CHAIN: + undo_push(p, hole_size, UNDO_DEL_CHAIN); + break; +# if ENABLE_FEATURE_NANO_UNDO_QUEUE + case ALLOW_UNDO_QUEUED: + undo_push(p, hole_size, UNDO_DEL_QUEUED); + break; +# endif + } + modified_count--; +#endif + if (src < text || src > end) + goto thd0; + if (dest < text || dest >= end) + goto thd0; + modified_count++; + if (src >= end) + goto thd_atend; // just delete the end of the buffer + memmove(dest, src, cnt); + thd_atend: + end = end - hole_size; // adjust the new END + if (dest >= end) + dest = end - 1; // make sure dest in below end-1 + if (end <= text) + dest = end = text; // keep pointers valid + thd0: + return dest; +} + +// copy text into register, then delete text. +// if dist <= 0, do not include, or go past, a NewLine +// +static char *yank_delete(char *start, char *stop, int dist, int yf, int undo) +{ + char *p; + + // make sure start <= stop + if (start > stop) { + // they are backwards, reverse them + p = start; + start = stop; + stop = p; + } + if (dist <= 0) { + // we cannot cross NL boundaries + p = start; + if (*p == '\n') + return p; + // dont go past a NewLine + for (; p + 1 <= stop; p++) { + if (p[1] == '\n') { + stop = p; // "stop" just before NewLine + break; + } + } + } + p = start; +#if ENABLE_FEATURE_NANO_YANKMARK + text_yank(start, stop); +#endif + if (yf == YANKDEL) { + p = text_hole_delete(start, stop, undo); + } // delete lines + return p; +} + +static void show_help(void) +{ + puts("These features are available:" +#if ENABLE_FEATURE_NANO_SEARCH + "\n\tPattern searches with / and ?" +#endif +#if ENABLE_FEATURE_NANO_YANKMARK + "\n\tLine marking with 'x" + "\n\tNamed buffers with \"x" +#endif +#if ENABLE_FEATURE_NANO_READONLY + //not implemented: "\n\tReadonly if nano is called as \"view\"" + //redundant: usage text says this too: "\n\tReadonly with -R command line arg" +#endif +#if ENABLE_FEATURE_NANO_SET + "\n\tSome colon mode commands with :" +#endif +#if ENABLE_FEATURE_NANO_SETOPTS + "\n\tSettable options with \":set\"" +#endif +#if ENABLE_FEATURE_NANO_USE_SIGNALS + "\n\tSignal catching- ^C" + "\n\tJob suspend and resume with ^Z" +#endif +#if ENABLE_FEATURE_NANO_WIN_RESIZE + "\n\tAdapt to window re-sizes" +#endif + ); +} + +#if ENABLE_FEATURE_NANO_YANKMARK \ + || (ENABLE_FEATURE_NANO_COLON && ENABLE_FEATURE_NANO_SEARCH) \ + || ENABLE_FEATURE_NANO_CRASHME +// might reallocate text[]! use p += string_insert(p, ...), +// and be careful to not use pointers into potentially freed text[]! +static uintptr_t string_insert(char *p, const char *s, int undo) // insert the string at 'p' +{ + uintptr_t bias; + int i; + + i = strlen(s); +#if ENABLE_FEATURE_NANO_UNDO + switch (undo) { + case ALLOW_UNDO: + undo_push(p, i, UNDO_INS); + break; + case ALLOW_UNDO_CHAIN: + undo_push(p, i, UNDO_INS_CHAIN); + break; + } +#endif + bias = text_hole_make(p, i); + p += bias; + memcpy(p, s, i); +#if ENABLE_FEATURE_NANO_YANKMARK + { + int cnt; + for (cnt = 0; *s != '\0'; s++) { + if (*s == '\n') + cnt++; + } + status_line("Put %d lines (%d chars)", cnt, i); + } +#endif + return bias; +} +#endif + +#if ENABLE_FEATURE_NANO_YANKMARK +static char *text_yank(char *p, char *q) // copy text into a register +{ + int cnt = q - p; + if (cnt < 0) { // they are backwards- reverse them + p = q; + cnt = -cnt; + } + if (yank_append) { + int l = strlen(clipboard); + clipboard = xrealloc(clipboard, l + cnt + 2); + memcpy(clipboard + l, p, cnt + 1); + clipboard[l + cnt + 1] = 0; + } else { + free(clipboard); // if already a yank register, free it + clipboard = xstrndup(p, cnt + 1); + } + return p; +} + +static void check_context(char cmd) +{ + // A context is defined to be "modifying text" + // Any modifying command establishes a new context. + + if (dot < context_start || dot > context_end) { + if (strchr(modifying_cmds, cmd) != NULL) { + // we are trying to modify text[]- make this the current context + mark[27] = mark[26]; // move cur to prev + mark[26] = dot; // move local to cur + context_start = prev_line(prev_line(dot)); + context_end = next_line(next_line(dot)); + //loiter= start_loiter= now; + } + } +} + +#endif /* FEATURE_NANO_YANKMARK */ + +//----- Set terminal attributes -------------------------------- +static void rawmode(void) +{ + // no TERMIOS_CLEAR_ISIG: leave ISIG on - allow signals + set_termios_to_raw(STDIN_FILENO, &term_orig, TERMIOS_RAW_CRNL); + erase_char = term_orig.c_cc[VERASE]; +} + +static void cookmode(void) +{ + fflush_all(); + tcsetattr_stdin_TCSANOW(&term_orig); +} + +#if ENABLE_FEATURE_NANO_USE_SIGNALS +//----- Come here when we get a window resize signal --------- +static void winch_sig(int sig UNUSED_PARAM) +{ + int save_errno = errno; + // FIXME: do it in main loop!!! + signal(SIGWINCH, winch_sig); + query_screen_dimensions(); + new_screen(rows, columns); // get memory for virtual screen + redraw(TRUE); // re-draw the screen + errno = save_errno; +} + +//----- Come here when we get a continue signal ------------------- +static void cont_sig(int sig UNUSED_PARAM) +{ + int save_errno = errno; + rawmode(); // terminal to "raw" + last_status_cksum = 0; // force status update + redraw(TRUE); // re-draw the screen + + signal(SIGTSTP, suspend_sig); + signal(SIGCONT, SIG_DFL); + //kill(my_pid, SIGCONT); // huh? why? we are already "continued"... + errno = save_errno; +} + +//----- Come here when we get a Suspend signal ------------------- +static void suspend_sig(int sig UNUSED_PARAM) +{ + int save_errno = errno; + go_bottom_and_clear_to_eol(); + cookmode(); // terminal to "cooked" + + signal(SIGCONT, cont_sig); + signal(SIGTSTP, SIG_DFL); + kill(my_pid, SIGTSTP); + errno = save_errno; +} + +//----- Come here when we get a signal --------------------------- +static void catch_sig(int sig) +{ + signal(SIGINT, catch_sig); + siglongjmp(restart, sig); +} +#endif /* FEATURE_NANO_USE_SIGNALS */ + +static int mysleep(int hund) // sleep for 'hund' 1/100 seconds or stdin ready +{ + struct pollfd pfd[1]; + + if (hund != 0) + fflush_all(); + + pfd[0].fd = STDIN_FILENO; + pfd[0].events = POLLIN; + return safe_poll(pfd, 1, hund*10) > 0; +} + +static int get_one_char(void) // read (maybe cursor) key from stdin +{ + int c; + + fflush_all(); + + // Wait for input. TIMEOUT = -1 makes read_key wait even + // on nonblocking stdin. + // Note: read_key sets errno to 0 on success. + again: + c = read_key(STDIN_FILENO, readbuffer, /*timeout:*/ -1); + if (c == -1) { // EOF/error + if (errno == EAGAIN) // paranoia + goto again; + go_bottom_and_clear_to_eol(); + cookmode(); // terminal to "cooked" + bb_error_msg_and_die("can't read user input"); + } + return c; +} + +// Get input line (uses "status line" area) +static char *get_input_line(const char *prompt, const char *value) +{ + // char [MAX_INPUT_LEN] +#define buf get_input_line__buf + + int c; + int i; + int selected = 0; + + int prompt_len = strlen(prompt); + strcpy(buf, prompt); + strncat(buf, value, sizeof(buf)); + last_status_cksum = 0; // force status update + go_bottom_and_clear_to_eol(); + write1(buf); // write out the :, /, or ? prompt + if (value != NULL && value[0]) { + place_cursor(rows - 1, prompt_len); + selected = 1; + } + + i = strlen(buf); + while (i < MAX_INPUT_LEN) { + c = get_one_char(); + if (selected) { + switch (c) { + case 0: case 27: case '\n': case '\r': + break; + case KEYCODE_RIGHT: case KEYCODE_END: + place_cursor(rows - 1, i = strlen(buf)); + selected = 0; + c = 0; + break; + default: + strcpy(buf, prompt); + i = prompt_len; + clear_to_eol(); + selected = 0; + } + } + switch (c) { + case 27: + get_one_char(); + // fallthrough + case 0: + break; + case '\n': case '\r': + goto end_of_input; + case 8: case 127: + backspace_2: + if (i > prompt_len) { + // erase prev char + buf[--i] = '\0'; + write1("\b \b"); + } + break; + default: + if (c == erase_char) goto backspace_2; +#if 0 // ENABLE_FEATURE_NANO_UTF8 this shouldn't actually be needed as handling is equivalent here, this may change if more complex line editing is required + char_len = utf8_char_len(c); + do { +#endif + buf[i] = c; + buf[++i] = '\0'; + bb_putchar(c); +#if 0 // ENABLE_FEATURE_NANO_UTF8 ditto + } while (--char_len > 0); +#endif + } + } + end_of_input: + refresh(FALSE); + return buf + prompt_len; +#undef buf +} + +// might reallocate text[]! +static int file_insert(const char *fn, char *p, int initial) +{ + int cnt = -1; + int fd, size; + struct stat statbuf; + + if (p < text) + p = text; + if (p > end) + p = end; + + fd = open(fn, O_RDONLY); + if (fd < 0) { + if (!initial) + status_line_bold_errno(fn); + return cnt; + } + + /* Validate file */ + if (fstat(fd, &statbuf) < 0) { + status_line_bold_errno(fn); + goto fi; + } + if (!S_ISREG(statbuf.st_mode)) { + status_line_bold("'%s' is not a regular file", fn); + goto fi; + } + size = (statbuf.st_size < INT_MAX ? (int)statbuf.st_size : INT_MAX); + p += text_hole_make(p, size); + cnt = full_read(fd, p, size); + if (cnt < 0) { + status_line_bold_errno(fn); + p = text_hole_delete(p, p + size - 1, NO_UNDO); // un-do buffer insert + } else if (cnt < size) { + // There was a partial read, shrink unused space + p = text_hole_delete(p + cnt, p + size - 1, NO_UNDO); + status_line_bold("can't read '%s'", fn); + } + fi: + close(fd); + +#if ENABLE_FEATURE_NANO_READONLY + if (initial + && ((access(fn, W_OK) < 0) || + /* root will always have access() + * so we check fileperms too */ + !(statbuf.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) + ) + ) { + SET_READONLY_FILE(readonly_mode); + } +#endif + return cnt; +} + +static int file_write(char *fn, char *first, char *last) +{ + int fd, cnt, charcnt; + + if (fn == 0) { + status_line_bold("No current filename"); + return -2; + } + /* By popular request we do not open file with O_TRUNC, + * but instead ftruncate() it _after_ successful write. + * Might reduce amount of data lost on power fail etc. + */ + fd = open(fn, (O_WRONLY | O_CREAT), 0666); + if (fd < 0) + return -1; + cnt = last - first + 1; + charcnt = full_write(fd, first, cnt); + ftruncate(fd, charcnt); + if (charcnt == cnt) { + // good write + //modified_count = FALSE; + } else { + charcnt = 0; + } + close(fd); + return charcnt; +} + +//----- Terminal Drawing --------------------------------------- +// The terminal is made up of 'rows' line of 'columns' columns. +// classically this would be 24 x 80. +// screen coordinates +// 0,0 ... 0,79 +// 1,0 ... 1,79 +// . ... . +// . ... . +// 22,0 ... 22,79 +// 23,0 ... 23,79 <- status line + +//----- Move the cursor to row x col (count from 0, not 1) ------- +static void place_cursor(int row, int col) +{ + char cm1[sizeof(ESC_SET_CURSOR_POS) + sizeof(int)*3 * 2]; + + if (row < 0) row = 0; + if (row >= rows) row = rows - 1; + if (col < 0) col = 0; + if (col >= columns) col = columns - 1; + + sprintf(cm1, ESC_SET_CURSOR_POS, row + 1, col + 1); + write1(cm1); +} + +//----- Erase from cursor to end of line ----------------------- +static void clear_to_eol(void) +{ + write1(ESC_CLEAR2EOL); +} + +static void go_bottom_and_clear_to_eol(void) +{ + place_cursor(rows - 1, 0); + clear_to_eol(); +} + +//----- Erase from cursor to end of screen ----------------------- +static void clear_to_eos(void) +{ + write1(ESC_CLEAR2EOS); +} + +//----- Start standout mode ------------------------------------ +static void standout_start(void) +{ + write1(ESC_BOLD_TEXT); +} + +//----- End standout mode -------------------------------------- +static void standout_end(void) +{ + write1(ESC_NORM_TEXT); +} + +static void indicate_error(void) +{ +#if ENABLE_FEATURE_NANO_CRASHME + if (crashme > 0) + return; // generate a random command +#endif + write1(ESC_BELL); +} + +//----- Screen[] Routines -------------------------------------- +//----- Erase the Screen[] memory ------------------------------ +static void screen_erase(void) +{ + memset(screen, ' ', screensize); // clear new screen +} + +static int bufsum(char *buf, int count) +{ + int sum = 0; + char *e = buf + count; + + while (buf < e) + sum += (unsigned char) *buf++; + return sum; +} + +//----- Draw the status line at bottom of the screen ------------- +static void show_status_line(void) +{ + int cnt = 0, cksum = 0; + + // either we already have an error or status message, or we + // create one. + if (!have_status_msg) { + cnt = format_edit_status(); + cksum = bufsum(status_buffer, cnt); + } + if (have_status_msg || ((cnt > 0 && last_status_cksum != cksum))) { + last_status_cksum = cksum; // remember if we have seen this line + go_bottom_and_clear_to_eol(); + write1(status_buffer); + if (have_status_msg) { + if (((int)strlen(status_buffer) - (have_status_msg - 1)) > + (columns - 1) ) { + have_status_msg = 0; + Hit_Return(); + } + have_status_msg = 0; + } + place_cursor(crow, ccol); // put cursor back in correct place + } + fflush_all(); +} + +//----- format the status buffer, the bottom line of screen ------ +// format status buffer, with STANDOUT mode +static void status_line_bold(const char *format, ...) +{ + va_list args; + + va_start(args, format); + strcpy(status_buffer, ESC_BOLD_TEXT); + vsprintf(status_buffer + sizeof(ESC_BOLD_TEXT)-1, format, args); + strcat(status_buffer, ESC_NORM_TEXT); + va_end(args); + + have_status_msg = 1 + sizeof(ESC_BOLD_TEXT) + sizeof(ESC_NORM_TEXT) - 2; +} + +static void status_line_bold_errno(const char *fn) +{ + status_line_bold("'%s' %s", fn, strerror(errno)); +} + +// format status buffer +static void status_line(const char *format, ...) +{ + va_list args; + + va_start(args, format); + vsprintf(status_buffer, format, args); + va_end(args); + + have_status_msg = 1; +} + +// copy s to buf, convert unprintable +static void print_literal(char *buf, const char *s) +{ + char *d; + unsigned char c; + + buf[0] = '\0'; + if (!s[0]) + s = "(NULL)"; + + d = buf; + for (; *s; s++) { + int c_is_no_print; + + c = *s; + c_is_no_print = (c & 0x80) && !Isprint(c); + if (c_is_no_print) { + strcpy(d, ESC_NORM_TEXT); + d += sizeof(ESC_NORM_TEXT)-1; + c = '.'; + } + if (c < ' ' || c == 0x7f) { + *d++ = '^'; + c |= '@'; /* 0x40 */ + if (c == 0x7f) + c = '?'; + } + *d++ = c; + *d = '\0'; + if (c_is_no_print) { + strcpy(d, ESC_BOLD_TEXT); + d += sizeof(ESC_BOLD_TEXT)-1; + } + if (*s == '\n') { + *d++ = '$'; + *d = '\0'; + } + if (d - buf > MAX_INPUT_LEN - 10) // paranoia + break; + } +} + +static void not_implemented(const char *s) +{ + char buf[MAX_INPUT_LEN]; + + print_literal(buf, s); + status_line_bold("\'%s\' is not implemented", buf); +} + +#define NANO_DEBUG 0 +#if NANO_DEBUG +static char last_key_code = 0; +#endif + +// show file status on status line +static int format_edit_status(void) +{ +#define tot format_edit_status__tot + + int cur, percent, ret, trunc_at; + + // modified_count is now a counter rather than a flag. this + // helps reduce the amount of line counting we need to do. + // (this will cause a mis-reporting of modified status + // once every MAXINT editing operations.) + + // it would be nice to do a similar optimization here -- if + // we haven't done a motion that could have changed which line + // we're on, then we shouldn't have to do this count_lines() + cur = count_lines(text, dot); + + // count_lines() is expensive. + // Call it only if something was changed since last time + // we were here: + if (modified_count != last_modified_count) { + tot = cur + count_lines(dot, end - 1) - 1; + last_modified_count = modified_count; + } + + // current line percent + // ------------- ~~ ---------- + // total lines 100 + if (tot > 0) { + percent = (100 * cur) / tot; + } else { + cur = tot = 0; + percent = 100; + } + + trunc_at = columns < STATUS_BUFFER_LEN-1 ? + columns : STATUS_BUFFER_LEN-1; + + ret = snprintf(status_buffer, trunc_at+1, +#if ENABLE_FEATURE_NANO_READONLY + " %s%s%s %d/%d %d%%" +#else + " %s%s %d/%d %d%%" +#endif +#if 0 + " %02x %02x %02x %02x %02x" +#endif +#if NANO_DEBUG + " %08x" +#endif +#if 0 + " %ld" +#endif + " ^X=Exit ^O=Save ^W=Search ^K=Cut ^U=Paste M-u Undo", + (current_filename != NULL ? current_filename : "No file"), +#if ENABLE_FEATURE_NANO_READONLY + (readonly_mode ? " [Readonly]" : ""), +#endif + (modified_count ? " [Modified]" : ""), + cur, tot, percent +#if 0 + (dot < end) ? dot[0] : 0, + (dot + 1 < end) ? dot[1] : 0, + (dot + 2 < end) ? dot[2] : 0, + (dot + 3 < end) ? dot[3] : 0, + (dot + 4 < end) ? dot[4] : 0, + (dot + 5 < end) ? dot[5] : 0, +#endif +#if NANO_DEBUG + last_key_code, +#endif +#if 0 + dot - text +#endif + ); + + if (ret >= 0 && ret < trunc_at) + return ret; /* it all fit */ + + return trunc_at; /* had to truncate */ +#undef tot +} + +//----- Force refresh of all Lines ----------------------------- +static void redraw(int full_screen) +{ + place_cursor(0, 0); + clear_to_eos(); + screen_erase(); // erase the internal screen buffer + last_status_cksum = 0; // force status update + refresh(full_screen); // this will redraw the entire display + show_status_line(); +} + +//----- Format a text[] line into a buffer --------------------- +static char* format_line(char *src /*, int li*/) +{ + unsigned char c; + int co; + int ofs = offset; + char *dest = scr_out_buf; // [MAX_SCR_COLS + MAX_TABSTOP * 2] + + c = '~'; // char in col 0 in non-existent lines is '~' + co = 0; + while (co < columns + tabstop) { + // have we gone past the end? + if (src < end) { + c = *src++; + if (c == '\n') + break; +#if 0 && ENABLE_FEATURE_NANO_UTF8 + // breaks redraw! + if (c & 0x80) { + do { + dest[co++] = c; + if (src < end) { + c = *src++; + } + } while (c & 0x80); + goto continue_printing; + } + if (!Isprint(c)) { + c = '.'; + } +#else + if ((c & 0x80) && !Isprint(c)) { + c = '.'; + } +#endif + if (c < ' ' || c == 0x7f) { + if (c == '\t') { + c = ' '; + // co % 8 != 7 + while ((co % tabstop) != (tabstop - 1)) { + dest[co++] = c; + } + } else { + dest[co++] = '^'; + if (c == 0x7f) + c = '?'; + else + c += '@'; // Ctrl-X -> 'X' + } + } + } + continue_printing: + dest[co++] = c; + // discard scrolled-off-to-the-left portion, + // in tabstop-sized pieces + if (ofs >= tabstop && co >= tabstop) { + memmove(dest, dest + tabstop, co); + co -= tabstop; + ofs -= tabstop; + } + if (src >= end) + break; + } + // check "short line, gigantic offset" case + if (co < ofs) + ofs = co; + // discard last scrolled off part + co -= ofs; + dest += ofs; + // fill the rest with spaces + if (co < columns) + memset(&dest[co], ' ', columns - co); + return dest; +} + +//----- Refresh the changed screen lines ----------------------- +// Copy the source line from text[] into the buffer and note +// if the current screenline is different from the new buffer. +// If they differ then that line needs redrawing on the terminal. +// +static void refresh(int full_screen) +{ +#define old_offset refresh__old_offset + + int li, changed; + char *tp, *sp; // pointer into text[] and screen[] + + if (ENABLE_FEATURE_NANO_WIN_RESIZE IF_FEATURE_NANO_ASK_TERMINAL(&& !G.get_rowcol_error) ) { + unsigned c = columns, r = rows; + query_screen_dimensions(); + full_screen |= (c - columns) | (r - rows); + } + sync_cursor(dot, &crow, &ccol); // where cursor will be (on "dot") + tp = screenbegin; // index into text[] of top line + + // compare text[] to screen[] and mark screen[] lines that need updating + for (li = 0; li < rows - 1; li++) { + int cs, ce; // column start & end + char *out_buf; + // format current text line + out_buf = format_line(tp /*, li*/); + + // skip to the end of the current text[] line + if (tp < end) { + char *t = memchr(tp, '\n', end - tp); + if (!t) t = end - 1; + tp = t + 1; + } + + // see if there are any changes between virtual screen and out_buf + changed = FALSE; // assume no change + cs = 0; + ce = columns - 1; + sp = &screen[li * columns]; // start of screen line + if (full_screen) { + // force re-draw of every single column from 0 - columns-1 + goto re0; + } + // compare newly formatted buffer with virtual screen + // look forward for first difference between buf and screen + for (; cs <= ce; cs++) { + if (out_buf[cs] != sp[cs]) { + changed = TRUE; // mark for redraw + break; + } + } + + // look backward for last difference between out_buf and screen + for (; ce >= cs; ce--) { + if (out_buf[ce] != sp[ce]) { + changed = TRUE; // mark for redraw + break; + } + } + // now, cs is index of first diff, and ce is index of last diff + + // if horz offset has changed, force a redraw + if (offset != old_offset) { + re0: + changed = TRUE; + } + + // make a sanity check of columns indexes + if (cs < 0) cs = 0; + if (ce > columns - 1) ce = columns - 1; + if (cs > ce) { cs = 0; ce = columns - 1; } + // is there a change between virtual screen and out_buf + if (changed) { + // copy changed part of buffer to virtual screen + memcpy(sp+cs, out_buf+cs, ce-cs+1); + place_cursor(li, cs); + // write line out to terminal + fwrite(&sp[cs], ce - cs + 1, 1, stdout); + } + } + + place_cursor(crow, ccol); + + old_offset = offset; +#undef old_offset +} + +static int save_file(void) +{ + int cnt; + if (ENABLE_FEATURE_NANO_READONLY && readonly_mode) { + status_line_bold("'%s' is read only", current_filename); + return 0; + } + cnt = file_write(current_filename, text, end - 1); + if (cnt < 0) { + if (cnt == -1) + status_line_bold("Write error: %s", strerror(errno)); + return 0; + } + if (cnt != (end - 1 - text + 1)) { + status_line_bold("File truncated: %s", strerror(errno)); + return 0; + } + modified_count = 0; + return 1; +} + +static int get_filename(void) +{ + char *p = get_input_line("Save to file: ", current_filename); + if (p == NULL || p[0] == 0) return 0; + free(current_filename); + current_filename = xstrdup(p); + return 1; +} + +//--------------------------------------------------------------------- +//----- the Ascii Chart ----------------------------------------------- +// +// 00 nul 01 soh 02 stx 03 etx 04 eot 05 enq 06 ack 07 bel +// 08 bs 09 ht 0a nl 0b vt 0c np 0d cr 0e so 0f si +// 10 dle 11 dc1 12 dc2 13 dc3 14 dc4 15 nak 16 syn 17 etb +// 18 can 19 em 1a sub 1b esc 1c fs 1d gs 1e rs 1f us +// 20 sp 21 ! 22 " 23 # 24 $ 25 % 26 & 27 ' +// 28 ( 29 ) 2a * 2b + 2c , 2d - 2e . 2f / +// 30 0 31 1 32 2 33 3 34 4 35 5 36 6 37 7 +// 38 8 39 9 3a : 3b ; 3c < 3d = 3e > 3f ? +// 40 @ 41 A 42 B 43 C 44 D 45 E 46 F 47 G +// 48 H 49 I 4a J 4b K 4c L 4d M 4e N 4f O +// 50 P 51 Q 52 R 53 S 54 T 55 U 56 V 57 W +// 58 X 59 Y 5a Z 5b [ 5c \ 5d ] 5e ^ 5f _ +// 60 ` 61 a 62 b 63 c 64 d 65 e 66 f 67 g +// 68 h 69 i 6a j 6b k 6c l 6d m 6e n 6f o +// 70 p 71 q 72 r 73 s 74 t 75 u 76 v 77 w +// 78 x 79 y 7a z 7b { 7c | 7d } 7e ~ 7f del +//--------------------------------------------------------------------- + +//----- Execute a Nano Command ----------------------------------- +static void do_cmd(int c) +{ + char *p, *q, *save_dot; + char buf[12]; + +// c1 = c; // quiet the compiler +// cnt = yf = 0; // quiet the compiler +// p = q = save_dot = buf; // quiet the compiler + memset(buf, '\0', sizeof(buf)); + +#if NANO_DEBUG + last_key_code = c; +#endif + // show_status_line(); // isn't this called twice per character? + + /* if this is a cursor key, skip these checks */ + switch (c) { +#if ENABLE_FEATURE_NANO_INSERT + // Unsupported yet, should insert file at point + case KEYCODE_INSERT: +#endif + default: + if (1 <= c || Isprint(c)) { + dot = char_insert(dot, c, ALLOW_UNDO_QUEUED); + break; + } + buf[0] = c; + buf[1] = '\0'; + not_implemented(buf); + end_cmd_q(); + break; + //case 0x01: // soh + //case 0x09: // ht + //case 0x0b: // vt + //case 0x0e: // so + //case 0x0f: // si + //case 0x10: // dle + //case 0x11: // dc1 + //case 0x13: // dc3 +#if ENABLE_FEATURE_NANO_CRASHME + case 0x14: // dc4 ctrl-T + crashme = (crashme == 0) ? 1 : 0; + break; +#endif + //case 0x16: // syn + //case 0x17: // etb + //case 0x18: // can + //case 0x1c: // fs + //case 0x1d: // gs + //case 0x1e: // rs + //case 0x1f: // us + //case '!': // !- + //case '#': // #- + //case '&': // &- + //case '(': // (- + //case ')': // )- + //case '*': // *- + //case '=': // =- + //case '@': // @- + //case 'F': // F- + //case 'K': // K- + //case 'Q': // Q- + //case 'S': // S- + //case 'T': // T- + //case 'V': // V- + //case '[': // [- + //case '\\': // \- + //case ']': // ]- + //case '_': // _- + //case '`': // `- + //case 'v': // v- + case 0x00: // nul- ignore + break; + case 2: // ctrl-B scroll up full screen + case KEYCODE_PAGEUP: // Cursor Key Page Up + dot_scroll(rows - 2, -1); + break; + case 4: // ctrl-D scroll down half screen + dot_scroll((rows - 2) / 2, 1); + break; + case 5: // ctrl-E scroll down one line + dot_scroll(1, 1); + break; + case 6: // ctrl-F scroll down full screen + case KEYCODE_PAGEDOWN: // Cursor Key Page Down + dot_scroll(rows - 2, 1); + break; + case 7: // ctrl-G show current status + last_status_cksum = 0; // force status update + break; + case KEYCODE_LEFT: // cursor key Left + dot_left(); + break; + case 8: + case 0x7f: + undo_queue_commit(); + save_dot = dot; + dot_left(); + if (dot != save_dot) { + dot = text_hole_delete(dot, save_dot-1, ALLOW_UNDO); + } + break; + case 10: // Newline ^J + case KEYCODE_DOWN: // cursor key Down + dot_next(); // go to next B-o-l + // try stay in same col + dot = move_to_col(dot, ccol + offset); + break; + case 12: // ctrl-L force redraw whole screen + case 18: // ctrl-R force redraw + place_cursor(0, 0); + clear_to_eos(); + //mysleep(10); // why??? + screen_erase(); // erase the internal screen buffer + last_status_cksum = 0; // force status update + refresh(TRUE); // this will redraw the entire display + break; + case CTRL_CODE('K'): +#if ENABLE_FEATURE_NANO_YANKMARK + if (yank_append && (dot - text) != previous_yank_position) { + yank_append = 0; + } +#endif + save_dot = begin_line(dot); + dot = end_line(dot); + dot = yank_delete(save_dot, dot, 1, YANKDEL, ALLOW_UNDO); +#if ENABLE_FEATURE_NANO_YANKMARK + yank_append = 1; + previous_yank_position = dot - text; +#endif + break; + case CTRL_CODE('O'): + undo_queue_commit(); + if (get_filename()) save_file(); + break; +#if ENABLE_FEATURE_NANO_YANKMARK + case CTRL_CODE('U'): + if (clipboard == NULL) { + status_line_bold("Nothing in clipboard"); + break; + } + dot += string_insert(dot, clipboard, ALLOW_UNDO); // insert the string + yank_append = 0; + break; +#endif + case CTRL_CODE('X'): + undo_queue_commit(); + if (modified_count != 0) { + go_bottom_and_clear_to_eol(); + write1("Save? [y/n]"); + switch (get_one_char()) { + case 'n': case 'N': + // modified_count = 0; + break; + case 'y': case 'Y': + if ((current_filename != NULL || get_filename()) && save_file()) break; + // fallthrough + default: + goto continue_editing; + } + } + editing = 0; + continue_editing: + break; +#if ENABLE_FEATURE_NANO_SEARCH + case CTRL_CODE('W'): +#define buf search__buf + p = get_input_line("Search: ", buf); + strcpy(buf, p); + q = dot + 1 < end ? strstr(dot+1, p) : NULL; + if (q != NULL) { + dot = q; + } else { + // This may scan parts of the buffer twice but is still correct and much simpler to implement. + q = strstr(text, p); + if (q != NULL) { + status_line_bold("Search wrapped!", p); + dot = q; + } else { + status_line_bold("String not found: %s", p); + } + } +#undef buf + break; +#endif + case 25: // ctrl-Y scroll up one line + dot_scroll(1, -1); + break; + case KEYCODE_RIGHT: // Cursor Key Right + dot_right(); + break; + case 27: + switch (get_one_char()) { +#if ENABLE_FEATURE_NANO_UNDO + case 'u': // u- undo last operation + undo_pop(); + break; +#endif + } + break; + case KEYCODE_END: // Cursor Key End + dot = end_line(dot); + break; + case KEYCODE_DELETE: + undo_queue_commit(); + save_dot = dot; + dot_right(); + if (dot != save_dot) { + dot = text_hole_delete(save_dot, dot-1, ALLOW_UNDO); + } + break; + case KEYCODE_UP: // cursor key Up + dot_prev(); + dot = move_to_col(dot, ccol + offset); // try stay in same col + break; + case KEYCODE_HOME: // Cursor Key Home + dot_begin(); + break; + // The Fn keys could point to do_macro which could translate them +#if 0 + case KEYCODE_FUN1: // Function Key F1 + case KEYCODE_FUN2: // Function Key F2 + case KEYCODE_FUN3: // Function Key F3 + case KEYCODE_FUN4: // Function Key F4 + case KEYCODE_FUN5: // Function Key F5 + case KEYCODE_FUN6: // Function Key F6 + case KEYCODE_FUN7: // Function Key F7 + case KEYCODE_FUN8: // Function Key F8 + case KEYCODE_FUN9: // Function Key F9 + case KEYCODE_FUN10: // Function Key F10 + case KEYCODE_FUN11: // Function Key F11 + case KEYCODE_FUN12: // Function Key F12 + break; +#endif + } + + // if text[] just became empty, add back an empty line +#if 0 + // I tried disabling this by two newlines are added instead! + if (end == text) { + char_insert(text, '\n', NO_UNDO); // start empty buf with dummy line + dot = text; + } +#endif + // it is OK for dot to exactly equal to end, otherwise check dot validity + if (dot != end) { + dot = bound_dot(dot); // make sure "dot" is valid + } +#if ENABLE_FEATURE_NANO_YANKMARK + check_context(c); // update the current context +#endif +} + +/* NB! the CRASHME code is unmaintained, and doesn't currently build */ +#if ENABLE_FEATURE_NANO_CRASHME +static int totalcmds = 0; +static int Mp = 85; // Movement command Probability +static int Np = 90; // Non-movement command Probability +static int Dp = 96; // Delete command Probability +static int Ip = 97; // Insert command Probability +static int Yp = 98; // Yank command Probability +static int Pp = 99; // Put command Probability +static int M = 0, N = 0, I = 0, D = 0, Y = 0, P = 0, U = 0; +static const char chars[20] = "\t012345 abcdABCD-=.$"; +static const char *const words[20] = { + "this", "is", "a", "test", + "broadcast", "the", "emergency", "of", + "system", "quick", "brown", "fox", + "jumped", "over", "lazy", "dogs", + "back", "January", "Febuary", "March" +}; +static const char *const lines[20] = { + "You should have received a copy of the GNU General Public License\n", + "char c, cm, *cmd, *cmd1;\n", + "generate a command by percentages\n", + "Numbers may be typed as a prefix to some commands.\n", + "Quit, discarding changes!\n", + "Forced write, if permission originally not valid.\n", + "In general, any ex or ed command (such as substitute or delete).\n", + "I have tickets available for the Blazers vs LA Clippers for Monday, Janurary 1 at 1:00pm.\n", + "Please get w/ me and I will go over it with you.\n", + "The following is a list of scheduled, committed changes.\n", + "1. Launch Norton Antivirus (Start, Programs, Norton Antivirus)\n", + "Reminder....Town Meeting in Central Perk cafe today at 3:00pm.\n", + "Any question about transactions please contact Sterling Huxley.\n", + "I will try to get back to you by Friday, December 31.\n", + "This Change will be implemented on Friday.\n", + "Let me know if you have problems accessing this;\n", + "Sterling Huxley recently added you to the access list.\n", + "Would you like to go to lunch?\n", + "The last command will be automatically run.\n", + "This is too much english for a computer geek.\n", +}; +static char *multilines[20] = { + "You should have received a copy of the GNU General Public License\n", + "char c, cm, *cmd, *cmd1;\n", + "generate a command by percentages\n", + "Numbers may be typed as a prefix to some commands.\n", + "Quit, discarding changes!\n", + "Forced write, if permission originally not valid.\n", + "In general, any ex or ed command (such as substitute or delete).\n", + "I have tickets available for the Blazers vs LA Clippers for Monday, Janurary 1 at 1:00pm.\n", + "Please get w/ me and I will go over it with you.\n", + "The following is a list of scheduled, committed changes.\n", + "1. Launch Norton Antivirus (Start, Programs, Norton Antivirus)\n", + "Reminder....Town Meeting in Central Perk cafe today at 3:00pm.\n", + "Any question about transactions please contact Sterling Huxley.\n", + "I will try to get back to you by Friday, December 31.\n", + "This Change will be implemented on Friday.\n", + "Let me know if you have problems accessing this;\n", + "Sterling Huxley recently added you to the access list.\n", + "Would you like to go to lunch?\n", + "The last command will be automatically run.\n", + "This is too much english for a computer geek.\n", +}; + +// create a random command to execute +static void crash_dummy() +{ + static int sleeptime; // how long to pause between commands + char c, cm, *cmd, *cmd1; + int i, cnt, thing, rbi, startrbi, percent; + + // "dot" movement commands + cmd1 = " \n\r\002\004\005\006\025\0310^$-+wWeEbBhjklHL"; + + // is there already a command running? + if (readbuffer[0] > 0) + goto cd1; + cd0: + readbuffer[0] = 'X'; + startrbi = rbi = 1; + sleeptime = 0; // how long to pause between commands + memset(readbuffer, '\0', sizeof(readbuffer)); + // generate a command by percentages + percent = (int) lrand48() % 100; // get a number from 0-99 + if (percent < Mp) { // Movement commands + // available commands + cmd = cmd1; + M++; + } else if (percent < Np) { // non-movement commands + cmd = "mz<>\'\""; // available commands + N++; + } else if (percent < Dp) { // Delete commands + cmd = "dx"; // available commands + D++; + } else if (percent < Ip) { // Inset commands + cmd = "iIaAsrJ"; // available commands + I++; + } else if (percent < Yp) { // Yank commands + cmd = "yY"; // available commands + Y++; + } else if (percent < Pp) { // Put commands + cmd = "pP"; // available commands + P++; + } else { + // We do not know how to handle this command, try again + U++; + goto cd0; + } + // randomly pick one of the available cmds from "cmd[]" + i = (int) lrand48() % strlen(cmd); + cm = cmd[i]; + if (strchr(":\024", cm)) + goto cd0; // dont allow colon or ctrl-T commands + readbuffer[rbi++] = cm; // put cmd into input buffer + + // now we have the command- + // there are 1, 2, and multi char commands + // find out which and generate the rest of command as necessary + if (strchr("dmryz<>\'\"", cm)) { // 2-char commands + cmd1 = " \n\r0$^-+wWeEbBhjklHL"; + if (cm == 'm' || cm == '\'' || cm == '\"') { // pick a reg[] + cmd1 = "abcdefghijklmnopqrstuvwxyz"; + } + thing = (int) lrand48() % strlen(cmd1); // pick a movement command + c = cmd1[thing]; + readbuffer[rbi++] = c; // add movement to input buffer + } + if (strchr("iIaAsc", cm)) { // multi-char commands + if (cm == 'c') { + // change some thing + thing = (int) lrand48() % strlen(cmd1); // pick a movement command + c = cmd1[thing]; + readbuffer[rbi++] = c; // add movement to input buffer + } + thing = (int) lrand48() % 4; // what thing to insert + cnt = (int) lrand48() % 10; // how many to insert + for (i = 0; i < cnt; i++) { + if (thing == 0) { // insert chars + readbuffer[rbi++] = chars[((int) lrand48() % strlen(chars))]; + } else if (thing == 1) { // insert words + strcat(readbuffer, words[(int) lrand48() % 20]); + strcat(readbuffer, " "); + sleeptime = 0; // how fast to type + } else if (thing == 2) { // insert lines + strcat(readbuffer, lines[(int) lrand48() % 20]); + sleeptime = 0; // how fast to type + } else { // insert multi-lines + strcat(readbuffer, multilines[(int) lrand48() % 20]); + sleeptime = 0; // how fast to type + } + } + strcat(readbuffer, "\033"); + } + readbuffer[0] = strlen(readbuffer + 1); + cd1: + totalcmds++; + if (sleeptime > 0) + mysleep(sleeptime); // sleep 1/100 sec +} + +// test to see if there are any errors +static void crash_test() +{ + static time_t oldtim; + + time_t tim; + char d[2], msg[80]; + + msg[0] = '\0'; + if (end < text) { + strcat(msg, "end<text "); + } + if (end > textend) { + strcat(msg, "end>textend "); + } + if (dot < text) { + strcat(msg, "dot<text "); + } + if (dot > end) { + strcat(msg, "dot>end "); + } + if (screenbegin < text) { + strcat(msg, "screenbegin<text "); + } + if (screenbegin > end - 1) { + strcat(msg, "screenbegin>end-1 "); + } + + if (msg[0]) { + printf("\n\n%d: \'%c\' %s\n\n\n%s[Hit return to continue]%s", + totalcmds, last_input_char, msg, ESC_BOLD_TEXT, ESC_NORM_TEXT); + fflush_all(); + while (safe_read(STDIN_FILENO, d, 1) > 0) { + if (d[0] == '\n' || d[0] == '\r') + break; + } + } + tim = time(NULL); + if (tim >= (oldtim + 3)) { + sprintf(status_buffer, + "Tot=%d: M=%d N=%d I=%d D=%d Y=%d P=%d U=%d size=%d", + totalcmds, M, N, I, D, Y, P, U, end - text + 1); + oldtim = tim; + } +} +#endif |