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3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 | /* vi: set sw=8 ts=8: */ /* * tiny vi.c: A small 'vi' clone * Copyright (C) 2000, 2001 Sterling Huxley <sterling@europa.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ char *vi_Version = "$Id: vi.c,v 1.11 2001/07/02 18:06:14 andersen Exp $"; /* * To compile for standalone use: * gcc -Wall -Os -s -DSTANDALONE -o vi vi.c * or * gcc -Wall -Os -s -DSTANDALONE -DBB_FEATURE_VI_CRASHME -o vi vi.c # include testing features * strip vi */ /* * Things To Do: * EXINIT * $HOME/.exrc and ./.exrc * add magic to search /foo.*bar * add :help command * :map macros * how about mode lines: vi: set sw=8 ts=8: * 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() * ":r !cmd" and "!cmd" to filter text through an external command * A true "undo" facility * An "ex" line oriented mode- maybe using "cmdedit" */ //---- Feature -------------- Bytes to immplement #ifdef STANDALONE #define vi_main main #define BB_FEATURE_VI_COLON // 4288 #define BB_FEATURE_VI_YANKMARK // 1408 #define BB_FEATURE_VI_SEARCH // 1088 #define BB_FEATURE_VI_USE_SIGNALS // 1056 #define BB_FEATURE_VI_DOT_CMD // 576 #define BB_FEATURE_VI_READONLY // 128 #define BB_FEATURE_VI_SETOPTS // 576 #define BB_FEATURE_VI_SET // 224 #define BB_FEATURE_VI_WIN_RESIZE // 256 WIN_RESIZE // To test editor using CRASHME: // vi -C filename // To stop testing, wait until all to text[] is deleted, or // Ctrl-Z and kill -9 %1 // while in the editor Ctrl-T will toggle the crashme function on and off. //#define BB_FEATURE_VI_CRASHME // randomly pick commands to execute #endif /* STANDALONE */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <termios.h> #include <unistd.h> #include <sys/ioctl.h> #include <sys/time.h> #include <sys/types.h> #include <sys/stat.h> #include <time.h> #include <fcntl.h> #include <signal.h> #include <setjmp.h> #include <regex.h> #include <ctype.h> #include <assert.h> #include <errno.h> #include <stdarg.h> #ifndef STANDALONE #include "busybox.h" #endif /* STANDALONE */ #ifndef TRUE #define TRUE ((int)1) #define FALSE ((int)0) #endif /* TRUE */ #define MAX_SCR_COLS BUFSIZ // Misc. non-Ascii keys that report an escape sequence #define VI_K_UP 128 // cursor key Up #define VI_K_DOWN 129 // cursor key Down #define VI_K_RIGHT 130 // Cursor Key Right #define VI_K_LEFT 131 // cursor key Left #define VI_K_HOME 132 // Cursor Key Home #define VI_K_END 133 // Cursor Key End #define VI_K_INSERT 134 // Cursor Key Insert #define VI_K_PAGEUP 135 // Cursor Key Page Up #define VI_K_PAGEDOWN 136 // Cursor Key Page Down #define VI_K_FUN1 137 // Function Key F1 #define VI_K_FUN2 138 // Function Key F2 #define VI_K_FUN3 139 // Function Key F3 #define VI_K_FUN4 140 // Function Key F4 #define VI_K_FUN5 141 // Function Key F5 #define VI_K_FUN6 142 // Function Key F6 #define VI_K_FUN7 143 // Function Key F7 #define VI_K_FUN8 144 // Function Key F8 #define VI_K_FUN9 145 // Function Key F9 #define VI_K_FUN10 146 // Function Key F10 #define VI_K_FUN11 147 // Function Key F11 #define VI_K_FUN12 148 // Function Key F12 static const int YANKONLY = FALSE; static const int YANKDEL = TRUE; static const int FORWARD = 1; // code depends on "1" for array index static const int BACK = -1; // code depends on "-1" for array index static const int LIMITED = 0; // how much of text[] in char_search static const int FULL = 1; // how much of text[] in char_search static const int S_BEFORE_WS = 1; // used in skip_thing() for moving "dot" static const int S_TO_WS = 2; // used in skip_thing() for moving "dot" static const int S_OVER_WS = 3; // used in skip_thing() for moving "dot" static const int S_END_PUNCT = 4; // used in skip_thing() for moving "dot" static const int S_END_ALNUM = 5; // used in skip_thing() for moving "dot" typedef unsigned char Byte; static int editing; // >0 while we are editing a file static int cmd_mode; // 0=command 1=insert static int file_modified; // buffer contents changed static int err_method; // indicate error with beep or flash static int fn_start; // index of first cmd line file name static int save_argc; // how many file names on cmd line static int cmdcnt; // repetition count static fd_set rfds; // use select() for small sleeps static struct timeval tv; // use select() for small sleeps static char erase_char; // the users erase character static int rows, columns; // the terminal screen is this size static int crow, ccol, offset; // cursor is on Crow x Ccol with Horz Ofset static char *SOs, *SOn; // terminal standout start/normal ESC sequence static char *bell; // terminal bell sequence static char *Ceol, *Ceos; // Clear-end-of-line and Clear-end-of-screen ESC sequence static char *CMrc; // Cursor motion arbitrary destination ESC sequence static char *CMup, *CMdown; // Cursor motion up and down ESC sequence static Byte *status_buffer; // mesages to the user static Byte last_input_char; // last char read from user static Byte last_forward_char; // last char searched for with 'f' static Byte *cfn; // previous, current, and next file name static Byte *text, *end, *textend; // pointers to the user data in memory static Byte *screen; // pointer to the virtual screen buffer static int screensize; // and its size static Byte *screenbegin; // index into text[], of top line on the screen static Byte *dot; // where all the action takes place static int tabstop; static struct termios term_orig, term_vi; // remember what the cooked mode was #ifdef BB_FEATURE_VI_OPTIMIZE_CURSOR static int last_row; // where the cursor was last moved to #endif /* BB_FEATURE_VI_OPTIMIZE_CURSOR */ #ifdef BB_FEATURE_VI_USE_SIGNALS static jmp_buf restart; // catch_sig() #endif /* BB_FEATURE_VI_USE_SIGNALS */ #ifdef BB_FEATURE_VI_WIN_RESIZE static struct winsize winsize; // remember the window size #endif /* BB_FEATURE_VI_WIN_RESIZE */ #ifdef BB_FEATURE_VI_DOT_CMD static int adding2q; // are we currently adding user input to q static Byte *last_modifying_cmd; // last modifying cmd for "." static Byte *ioq, *ioq_start; // pointer to string for get_one_char to "read" #endif /* BB_FEATURE_VI_DOT_CMD */ #if defined(BB_FEATURE_VI_DOT_CMD) || defined(BB_FEATURE_VI_YANKMARK) static Byte *modifying_cmds; // cmds that modify text[] #endif /* BB_FEATURE_VI_DOT_CMD || BB_FEATURE_VI_YANKMARK */ #ifdef BB_FEATURE_VI_READONLY static int vi_readonly, readonly; #endif /* BB_FEATURE_VI_READONLY */ #ifdef BB_FEATURE_VI_SETOPTS static int autoindent; static int showmatch; static int ignorecase; #endif /* BB_FEATURE_VI_SETOPTS */ #ifdef BB_FEATURE_VI_YANKMARK static Byte *reg[28]; // named register a-z, "D", and "U" 0-25,26,27 static int YDreg, Ureg; // default delete register and orig line for "U" static Byte *mark[28]; // user marks points somewhere in text[]- a-z and previous context '' static Byte *context_start, *context_end; #endif /* BB_FEATURE_VI_YANKMARK */ #ifdef BB_FEATURE_VI_SEARCH static Byte *last_search_pattern; // last pattern from a '/' or '?' search #endif /* BB_FEATURE_VI_SEARCH */ static void edit_file(Byte *); // edit one file static void do_cmd(Byte); // execute a command static void sync_cursor(Byte *, int *, int *); // synchronize the screen cursor to dot static Byte *begin_line(Byte *); // return pointer to cur line B-o-l static Byte *end_line(Byte *); // return pointer to cur line E-o-l static Byte *dollar_line(Byte *); // return pointer to just before NL static Byte *prev_line(Byte *); // return pointer to prev line B-o-l static Byte *next_line(Byte *); // return pointer to next line B-o-l static Byte *end_screen(void); // get pointer to last char on screen static int count_lines(Byte *, Byte *); // count line from start to stop static Byte *find_line(int); // find begining of line #li static Byte *move_to_col(Byte *, int); // move "p" to column l static int isblnk(Byte); // is the char a blank or tab 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_end(void); // move dot to E-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 void dot_delete(void); // delete the char at 'dot' static Byte *bound_dot(Byte *); // make sure text[0] <= P < "end" static Byte *new_screen(int, int); // malloc virtual screen memory static Byte *new_text(int); // malloc memory for text[] buffer static Byte *char_insert(Byte *, Byte); // insert the char c at 'p' static Byte *stupid_insert(Byte *, Byte); // stupidly insert the char c at 'p' static Byte find_range(Byte **, Byte **, Byte); // return pointers for an object static int st_test(Byte *, int, int, Byte *); // helper for skip_thing() static Byte *skip_thing(Byte *, int, int, int); // skip some object static Byte *find_pair(Byte *, Byte); // find matching pair () [] {} static Byte *text_hole_delete(Byte *, Byte *); // at "p", delete a 'size' byte hole static Byte *text_hole_make(Byte *, int); // at "p", make a 'size' byte hole static Byte *yank_delete(Byte *, Byte *, int, int); // yank text[] into register then delete static void show_help(void); // display some help info static void print_literal(Byte *, Byte *); // copy s to buf, convert unprintable static void rawmode(void); // set "raw" mode on tty static void cookmode(void); // return to "cooked" mode on tty static int mysleep(int); // sleep for 'h' 1/100 seconds static Byte readit(void); // read (maybe cursor) key from stdin static Byte get_one_char(void); // read 1 char from stdin static int file_size(Byte *); // what is the byte size of "fn" static int file_insert(Byte *, Byte *, int); static int file_write(Byte *, Byte *, Byte *); static void place_cursor(int, int, int); static void screen_erase(); static void clear_to_eol(void); static void clear_to_eos(void); static void standout_start(void); // send "start reverse video" sequence static void standout_end(void); // send "end reverse video" sequence static void flash(int); // flash the terminal screen static void beep(void); // beep the terminal static void indicate_error(char); // use flash or beep to indicate error static void show_status_line(void); // put a message on the bottom line static void psb(char *, ...); // Print Status Buf static void psbs(char *, ...); // Print Status Buf in standout mode static void ni(Byte *); // display messages static void edit_status(void); // show file status on status line static void redraw(int); // force a full screen refresh static void format_line(Byte*, Byte*, int); static void refresh(int); // update the terminal from screen[] #ifdef BB_FEATURE_VI_SEARCH static Byte *char_search(Byte *, Byte *, int, int); // search for pattern starting at p static int mycmp(Byte *, Byte *, int); // string cmp based in "ignorecase" #endif /* BB_FEATURE_VI_SEARCH */ #ifdef BB_FEATURE_VI_COLON static void Hit_Return(void); static Byte *get_one_address(Byte *, int *); // get colon addr, if present static Byte *get_address(Byte *, int *, int *); // get two colon addrs, if present static void colon(Byte *); // execute the "colon" mode cmds #endif /* BB_FEATURE_VI_COLON */ static Byte *get_input_line(Byte *); // get input line- use "status line" #ifdef BB_FEATURE_VI_USE_SIGNALS static void winch_sig(int); // catch window size changes static void suspend_sig(int); // catch ctrl-Z static void alarm_sig(int); // catch alarm time-outs static void catch_sig(int); // catch ctrl-C static void core_sig(int); // catch a core dump signal #endif /* BB_FEATURE_VI_USE_SIGNALS */ #ifdef BB_FEATURE_VI_DOT_CMD static void start_new_cmd_q(Byte); // new queue for command static void end_cmd_q(); // stop saving input chars #else /* BB_FEATURE_VI_DOT_CMD */ #define end_cmd_q() #endif /* BB_FEATURE_VI_DOT_CMD */ #ifdef BB_FEATURE_VI_WIN_RESIZE static void window_size_get(int); // find out what size the window is #endif /* BB_FEATURE_VI_WIN_RESIZE */ #ifdef BB_FEATURE_VI_SETOPTS static void showmatching(Byte *); // show the matching pair () [] {} #endif /* BB_FEATURE_VI_SETOPTS */ #if defined(BB_FEATURE_VI_YANKMARK) || defined(BB_FEATURE_VI_COLON) || defined(BB_FEATURE_VI_CRASHME) static Byte *string_insert(Byte *, Byte *); // insert the string at 'p' #endif /* BB_FEATURE_VI_YANKMARK || BB_FEATURE_VI_COLON || BB_FEATURE_VI_CRASHME */ #ifdef BB_FEATURE_VI_YANKMARK static Byte *text_yank(Byte *, Byte *, int); // save copy of "p" into a register static Byte what_reg(void); // what is letter of current YDreg static void check_context(Byte); // remember context for '' command static Byte *swap_context(Byte *); // goto new context for '' command #endif /* BB_FEATURE_VI_YANKMARK */ #ifdef BB_FEATURE_VI_CRASHME static void crash_dummy(); static void crash_test(); static int crashme = 0; #endif /* BB_FEATURE_VI_CRASHME */ extern int vi_main(int argc, char **argv) { int c; #ifdef BB_FEATURE_VI_YANKMARK int i; #endif /* BB_FEATURE_VI_YANKMARK */ CMrc= "\033[%d;%dH"; // Terminal Crusor motion ESC sequence CMup= "\033[A"; // move cursor up one line, same col CMdown="\n"; // move cursor down one line, same col Ceol= "\033[0K"; // Clear from cursor to end of line Ceos= "\033[0J"; // Clear from cursor to end of screen SOs = "\033[7m"; // Terminal standout mode on SOn = "\033[0m"; // Terminal standout mode off bell= "\007"; // Terminal bell sequence #ifdef BB_FEATURE_VI_CRASHME (void) srand((long) getpid()); #endif /* BB_FEATURE_VI_CRASHME */ status_buffer = (Byte *) malloc(200); // hold messages to user #ifdef BB_FEATURE_VI_READONLY vi_readonly = readonly = FALSE; if (strncmp(argv[0], "view", 4) == 0) { readonly = TRUE; vi_readonly = TRUE; } #endif /* BB_FEATURE_VI_READONLY */ #ifdef BB_FEATURE_VI_SETOPTS autoindent = 1; ignorecase = 1; showmatch = 1; #endif /* BB_FEATURE_VI_SETOPTS */ #ifdef BB_FEATURE_VI_YANKMARK for (i = 0; i < 28; i++) { reg[i] = 0; } // init the yank regs #endif /* BB_FEATURE_VI_YANKMARK */ #ifdef BB_FEATURE_VI_DOT_CMD modifying_cmds = (Byte *) "aAcCdDiIJoOpPrRsxX<>~"; // cmds modifying text[] #endif /* BB_FEATURE_VI_DOT_CMD */ // 1- process $HOME/.exrc file // 2- process EXINIT variable from environment // 3- process command line args while ((c = getopt(argc, argv, "hCR")) != -1) { switch (c) { #ifdef BB_FEATURE_VI_CRASHME case 'C': crashme = 1; break; #endif /* BB_FEATURE_VI_CRASHME */ #ifdef BB_FEATURE_VI_READONLY case 'R': // Read-only flag readonly = TRUE; break; #endif /* BB_FEATURE_VI_READONLY */ //case 'r': // recover flag- ignore- we don't use tmp file //case 'x': // encryption flag- ignore //case 'c': // execute command first //case 'h': // help -- just use default default: show_help(); return 1; } } // The argv array can be used by the ":next" and ":rewind" commands // save optind. fn_start = optind; // remember first file name for :next and :rew save_argc = argc; //----- This is the main file handling loop -------------- if (optind >= argc) { editing = 1; // 0= exit, 1= one file, 2= multiple files edit_file(0); } else { for (; optind < argc; optind++) { editing = 1; // 0=exit, 1=one file, 2+ =many files if (cfn != 0) free(cfn); cfn = (Byte *) strdup(argv[optind]); edit_file(cfn); } } //----------------------------------------------------------- return (0); } static void edit_file(Byte * fn) { char c; int cnt, size, ch; #ifdef BB_FEATURE_VI_USE_SIGNALS char *msg; int sig; #endif /* BB_FEATURE_VI_USE_SIGNALS */ #ifdef BB_FEATURE_VI_YANKMARK static Byte *cur_line; #endif /* BB_FEATURE_VI_YANKMARK */ rawmode(); rows = 24; columns = 80; ch= -1; #ifdef BB_FEATURE_VI_WIN_RESIZE window_size_get(0); #endif /* BB_FEATURE_VI_WIN_RESIZE */ new_screen(rows, columns); // get memory for virtual screen cnt = file_size(fn); // file size size = 2 * cnt; // 200% of file size new_text(size); // get a text[] buffer screenbegin = dot = end = text; if (fn != 0) { ch= file_insert(fn, text, cnt); } if (ch < 1) { (void) char_insert(text, '\n'); // start empty buf with dummy line } file_modified = FALSE; #ifdef BB_FEATURE_VI_YANKMARK YDreg = 26; // default Yank/Delete reg Ureg = 27; // hold orig line for "U" cmd for (cnt = 0; cnt < 28; cnt++) { mark[cnt] = 0; } // init the marks mark[26] = mark[27] = text; // init "previous context" #endif /* BB_FEATURE_VI_YANKMARK */ err_method = 1; // flash last_forward_char = last_input_char = '\0'; crow = 0; ccol = 0; edit_status(); #ifdef BB_FEATURE_VI_USE_SIGNALS signal(SIGHUP, catch_sig); signal(SIGINT, catch_sig); signal(SIGALRM, alarm_sig); signal(SIGTERM, catch_sig); signal(SIGQUIT, core_sig); signal(SIGILL, core_sig); signal(SIGTRAP, core_sig); signal(SIGIOT, core_sig); signal(SIGABRT, core_sig); signal(SIGFPE, core_sig); signal(SIGBUS, core_sig); signal(SIGSEGV, core_sig); #ifdef SIGSYS signal(SIGSYS, core_sig); #endif signal(SIGWINCH, winch_sig); signal(SIGTSTP, suspend_sig); sig = setjmp(restart); if (sig != 0) { msg = ""; if (sig == SIGWINCH) msg = "(window resize)"; if (sig == SIGHUP) msg = "(hangup)"; if (sig == SIGINT) msg = "(interrupt)"; if (sig == SIGTERM) msg = "(terminate)"; if (sig == SIGBUS) msg = "(bus error)"; if (sig == SIGSEGV) msg = "(I tried to touch invalid memory)"; if (sig == SIGALRM) msg = "(alarm)"; psbs("-- caught signal %d %s--", sig, msg); screenbegin = dot = text; } #endif /* BB_FEATURE_VI_USE_SIGNALS */ editing = 1; cmd_mode = 0; // 0=command 1=insert 2='R'eplace cmdcnt = 0; tabstop = 8; offset = 0; // no horizontal offset c = '\0'; #ifdef BB_FEATURE_VI_DOT_CMD if (last_modifying_cmd != 0) free(last_modifying_cmd); if (ioq_start != NULL) free(ioq_start); ioq = ioq_start = last_modifying_cmd = 0; adding2q = 0; #endif /* BB_FEATURE_VI_DOT_CMD */ redraw(FALSE); // dont force every col re-draw show_status_line(); //------This is the main Vi cmd handling loop ----------------------- while (editing > 0) { #ifdef BB_FEATURE_VI_CRASHME if (crashme > 0) { if ((end - text) > 1) { crash_dummy(); // generate a random command } else { crashme = 0; dot = string_insert(text, (Byte *) "\n\n##### Ran out of text to work on. #####\n\n"); // insert the string refresh(FALSE); } } #endif /* BB_FEATURE_VI_CRASHME */ last_input_char = c = get_one_char(); // get a cmd from user #ifdef BB_FEATURE_VI_YANKMARK // save a copy of the current line- for the 'U" command if (begin_line(dot) != cur_line) { cur_line = begin_line(dot); text_yank(begin_line(dot), end_line(dot), Ureg); } #endif /* BB_FEATURE_VI_YANKMARK */ #ifdef BB_FEATURE_VI_DOT_CMD // These are commands that change text[]. // Remember the input for the "." command if (!adding2q && ioq_start == 0 && strchr((char *) modifying_cmds, c) != NULL) { start_new_cmd_q(c); } #endif /* BB_FEATURE_VI_DOT_CMD */ 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 (mysleep(0) == 0) { // no input pending- so update output refresh(FALSE); show_status_line(); } #ifdef BB_FEATURE_VI_CRASHME if (crashme > 0) crash_test(); // test editor variables #endif /* BB_FEATURE_VI_CRASHME */ } //------------------------------------------------------------------- place_cursor(rows, 0, FALSE); // go to bottom of screen clear_to_eol(); // Erase to end of line cookmode(); } static Byte readbuffer[BUFSIZ]; #ifdef BB_FEATURE_VI_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; char chars[20] = "\t012345 abcdABCD-=.$"; char *words[20] = { "this", "is", "a", "test", "broadcast", "the", "emergency", "of", "system", "quick", "brown", "fox", "jumped", "over", "lazy", "dogs", "back", "January", "Febuary", "March" }; char *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", }; 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^$-+wWeEbBhjklHL"; // is there already a command running? if (strlen((char *) readbuffer) > 0) goto cd1; cd0: startrbi = rbi = 0; sleeptime = 0; // how long to pause between commands memset(readbuffer, '\0', BUFSIZ - 1); // clear the read buffer // generate a command by percentages percent = (int) lrand48() % 100; // get a number from 0-99 if (percent < Mp) { // Movement commands // available commands cmd = cmd1; M++; } else if (percent < Np) { // non-movement commands cmd = "mz<>\'\""; // available commands N++; } else if (percent < Dp) { // Delete commands cmd = "dx"; // available commands D++; } else if (percent < Ip) { // Inset commands cmd = "iIaAsrJ"; // available commands I++; } else if (percent < Yp) { // Yank commands cmd = "yY"; // available commands Y++; } else if (percent < Pp) { // Put commands cmd = "pP"; // available commands P++; } else { // We do not know how to handle this command, try again U++; goto cd0; } // randomly pick one of the available cmds from "cmd[]" i = (int) lrand48() % strlen(cmd); cm = cmd[i]; if (strchr(":\024", cm)) goto cd0; // dont allow colon or ctrl-T commands readbuffer[rbi++] = cm; // put cmd into input buffer // now we have the command- // there are 1, 2, and multi char commands // find out which and generate the rest of command as necessary if (strchr("dmryz<>\'\"", cm)) { // 2-char commands cmd1 = " \n\r0$^-+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((char *) readbuffer, words[(int) lrand48() % 20]); strcat((char *) readbuffer, " "); sleeptime = 0; // how fast to type } else if (thing == 2) { // insert lines strcat((char *) readbuffer, lines[(int) lrand48() % 20]); sleeptime = 0; // how fast to type } else { // insert multi-lines strcat((char *) readbuffer, multilines[(int) lrand48() % 20]); sleeptime = 0; // how fast to type } } strcat((char *) readbuffer, "\033"); } cd1: totalcmds++; if (sleeptime > 0) (void) 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], buf[BUFSIZ], msg[BUFSIZ]; msg[0] = '\0'; if (end < text) { strcat((char *) msg, "end<text "); } if (end > textend) { strcat((char *) msg, "end>textend "); } if (dot < text) { strcat((char *) msg, "dot<text "); } if (dot > end) { strcat((char *) msg, "dot>end "); } if (screenbegin < text) { strcat((char *) msg, "screenbegin<text "); } if (screenbegin > end - 1) { strcat((char *) msg, "screenbegin>end-1 "); } if (strlen(msg) > 0) { alarm(0); sprintf(buf, "\n\n%d: \'%c\' %s\n\n\n%s[Hit return to continue]%s", totalcmds, last_input_char, msg, SOs, SOn); write(1, buf, strlen(buf)); while (read(0, d, 1) > 0) { if (d[0] == '\n' || d[0] == '\r') break; } alarm(3); } tim = (time_t) time((time_t *) 0); if (tim >= (oldtim + 3)) { sprintf((char *) 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; } return; } #endif /* BB_FEATURE_VI_CRASHME */ //--------------------------------------------------------------------- //----- 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 Vi Command ----------------------------------- static void do_cmd(Byte c) { Byte c1, *p, *q, *msg, buf[9], *save_dot; int cnt, i, j, dir, yf; c1 = c; // quiet the compiler cnt = yf = dir = 0; // quiet the compiler p = q = save_dot = msg = buf; // quiet the compiler memset(buf, '\0', 9); // clear buf if (cmd_mode == 2) { // we are 'R'eplacing the current *dot with new char if (*dot == '\n') { // don't Replace past E-o-l cmd_mode = 1; // convert to insert } else { if (1 <= c && c <= 127) { // only ASCII chars if (c != 27) dot = yank_delete(dot, dot, 0, YANKDEL); // delete char dot = char_insert(dot, c); // insert new char } goto dc1; } } if (cmd_mode == 1) { // hitting "Insert" twice means "R" replace mode if (c == VI_K_INSERT) goto dc5; // insert the char c at "dot" if (1 <= c && c <= 127) { dot = char_insert(dot, c); // only ASCII chars } goto dc1; } switch (c) { //case 0x01: // soh //case 0x09: // ht //case 0x0b: // vt //case 0x0e: // so //case 0x0f: // si //case 0x10: // dle //case 0x11: // dc1 //case 0x13: // dc3 #ifdef BB_FEATURE_VI_CRASHME case 0x14: // dc4 ctrl-T crashme = (crashme == 0) ? 1 : 0; break; #endif /* BB_FEATURE_VI_CRASHME */ //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 '@': // @- //case 'F': // F- //case 'K': // K- //case 'Q': // Q- //case 'S': // S- //case 'T': // T- //case 'V': // V- //case '[': // [- //case '\\': // \- //case ']': // ]- //case '_': // _- //case '`': // `- //case 'g': // g- //case 'u': // u- FIXME- there is no undo //case 'v': // v- default: // unrecognised command buf[0] = c; buf[1] = '\0'; if (c <= ' ') { buf[0] = '^'; buf[1] = c + '@'; buf[2] = '\0'; } ni((Byte *) buf); end_cmd_q(); // stop adding to q case 0x00: // nul- ignore break; case 2: // ctrl-B scroll up full screen case VI_K_PAGEUP: // Cursor Key Page Up dot_scroll(rows - 2, -1); break; #ifdef BB_FEATURE_VI_USE_SIGNALS case 0x03: // ctrl-C interrupt longjmp(restart, 1); break; case 26: // ctrl-Z suspend suspend_sig(SIGTSTP); break; #endif /* BB_FEATURE_VI_USE_SIGNALS */ 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 VI_K_PAGEDOWN: // Cursor Key Page Down dot_scroll(rows - 2, 1); break; case 7: // ctrl-G show current status edit_status(); break; case 'h': // h- move left case VI_K_LEFT: // cursor key Left case 8: // ctrl-H- move left (This may be ERASE char) case 127: // DEL- move left (This may be ERASE char) if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dot_left(); break; case 10: // Newline ^J case 'j': // j- goto next line, same col case VI_K_DOWN: // cursor key Down if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dot_next(); // go to next B-o-l dot = move_to_col(dot, ccol + offset); // try stay in same col break; case 12: // ctrl-L force redraw whole screen case 18: // ctrl-R force redraw place_cursor(0, 0, FALSE); // put cursor in correct place clear_to_eos(); // tel terminal to erase display (void) mysleep(10); screen_erase(); // erase the internal screen buffer refresh(TRUE); // this will redraw the entire display break; case 13: // Carriage Return ^M case '+': // +- goto next line if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dot_next(); dot_skip_over_ws(); break; case 21: // ctrl-U scroll up half screen dot_scroll((rows - 2) / 2, -1); break; case 25: // ctrl-Y scroll up one line dot_scroll(1, -1); break; case 27: // esc if (cmd_mode == 0) indicate_error(c); cmd_mode = 0; // stop insrting end_cmd_q(); *status_buffer = '\0'; // clear status buffer break; case ' ': // move right case 'l': // move right case VI_K_RIGHT: // Cursor Key Right if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dot_right(); break; #ifdef BB_FEATURE_VI_YANKMARK case '"': // "- name a register to use for Delete/Yank c1 = get_one_char(); c1 = tolower(c1); if (islower(c1)) { YDreg = c1 - 'a'; } else { indicate_error(c); } break; case '\'': // '- goto a specific mark c1 = get_one_char(); c1 = tolower(c1); if (islower(c1)) { c1 = c1 - 'a'; // get the b-o-l q = mark[(int) c1]; if (text <= q && q < end) { dot = q; dot_begin(); // go to B-o-l dot_skip_over_ws(); } } else if (c1 == '\'') { // goto previous context dot = swap_context(dot); // swap current and previous context dot_begin(); // go to B-o-l dot_skip_over_ws(); } else { indicate_error(c); } break; case 'm': // m- Mark a line // this is really stupid. If there are any inserts or deletes // between text[0] and dot then this mark will not point to the // correct location! It could be off by many lines! // Well..., at least its quick and dirty. c1 = get_one_char(); c1 = tolower(c1); if (islower(c1)) { c1 = c1 - 'a'; // remember the line mark[(int) c1] = dot; } else { indicate_error(c); } break; case 'P': // P- Put register before case 'p': // p- put register after p = reg[YDreg]; if (p == 0) { psbs("Nothing in register %c", what_reg()); break; } // are we putting whole lines or strings if (strchr((char *) p, '\n') != NULL) { if (c == 'P') { dot_begin(); // putting lines- Put above } if (c == 'p') { // are we putting after very last line? if (end_line(dot) == (end - 1)) { dot = end; // force dot to end of text[] } else { dot_next(); // next line, then put before } } } else { if (c == 'p') dot_right(); // move to right, can move to NL } dot = string_insert(dot, p); // insert the string end_cmd_q(); // stop adding to q break; case 'U': // U- Undo; replace current line with original version if (reg[Ureg] != 0) { p = begin_line(dot); q = end_line(dot); p = text_hole_delete(p, q); // delete cur line p = string_insert(p, reg[Ureg]); // insert orig line dot = p; dot_skip_over_ws(); } break; #endif /* BB_FEATURE_VI_YANKMARK */ case '$': // $- goto end of line case VI_K_END: // Cursor Key End if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dot = end_line(dot + 1); break; case '%': // %- find matching char of pair () [] {} for (q = dot; q < end && *q != '\n'; q++) { if (strchr("()[]{}", *q) != NULL) { // we found half of a pair p = find_pair(q, *q); if (p == NULL) { indicate_error(c); } else { dot = p; } break; } } if (*q == '\n') indicate_error(c); break; case 'f': // f- forward to a user specified char last_forward_char = get_one_char(); // get the search char // // dont seperate these two commands. 'f' depends on ';' // //**** fall thru to ... 'i' case ';': // ;- look at rest of line for last forward char if (cmdcnt-- > 1) { do_cmd(';'); } // repeat cnt if (last_forward_char == 0) break; q = dot + 1; while (q < end - 1 && *q != '\n' && *q != last_forward_char) { q++; } if (*q == last_forward_char) dot = q; break; case '-': // -- goto prev line if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dot_prev(); dot_skip_over_ws(); break; #ifdef BB_FEATURE_VI_DOT_CMD case '.': // .- repeat the last modifying command // Stuff the last_modifying_cmd back into stdin // and let it be re-executed. if (last_modifying_cmd != 0) { ioq = ioq_start = (Byte *) strdup((char *) last_modifying_cmd); } break; #endif /* BB_FEATURE_VI_DOT_CMD */ #ifdef BB_FEATURE_VI_SEARCH case '?': // /- search for a pattern case '/': // /- search for a pattern buf[0] = c; buf[1] = '\0'; q = get_input_line(buf); // get input line- use "status line" if (strlen((char *) q) == 1) goto dc3; // if no pat re-use old pat if (strlen((char *) q) > 1) { // new pat- save it and find // there is a new pat if (last_search_pattern != 0) { free(last_search_pattern); } last_search_pattern = (Byte *) strdup((char *) q); goto dc3; // now find the pattern } // user changed mind and erased the "/"- do nothing break; case 'N': // N- backward search for last pattern if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dir = BACK; // assume BACKWARD search p = dot - 1; if (last_search_pattern[0] == '?') { dir = FORWARD; p = dot + 1; } goto dc4; // now search for pattern break; case 'n': // n- repeat search for last pattern // search rest of text[] starting at next char // if search fails return orignal "p" not the "p+1" address if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dc3: if (last_search_pattern == 0) { msg = (Byte *) "No previous regular expression"; goto dc2; } if (last_search_pattern[0] == '/') { dir = FORWARD; // assume FORWARD search p = dot + 1; } if (last_search_pattern[0] == '?') { dir = BACK; p = dot - 1; } dc4: q = char_search(p, last_search_pattern + 1, dir, FULL); if (q != NULL) { dot = q; // good search, update "dot" msg = (Byte *) ""; goto dc2; } // no pattern found between "dot" and "end"- continue at top p = text; if (dir == BACK) { p = end - 1; } q = char_search(p, last_search_pattern + 1, dir, FULL); if (q != NULL) { // found something dot = q; // found new pattern- goto it msg = (Byte *) "search hit BOTTOM, continuing at TOP"; if (dir == BACK) { msg = (Byte *) "search hit TOP, continuing at BOTTOM"; } } else { msg = (Byte *) "Pattern not found"; } dc2: psbs("%s", msg); break; case '{': // {- move backward paragraph q = char_search(dot, (Byte *) "\n\n", BACK, FULL); if (q != NULL) { // found blank line dot = next_line(q); // move to next blank line } break; case '}': // }- move forward paragraph q = char_search(dot, (Byte *) "\n\n", FORWARD, FULL); if (q != NULL) { // found blank line dot = next_line(q); // move to next blank line } break; #endif /* BB_FEATURE_VI_SEARCH */ case '0': // 0- goto begining of line case '1': // 1- case '2': // 2- case '3': // 3- case '4': // 4- case '5': // 5- case '6': // 6- case '7': // 7- case '8': // 8- case '9': // 9- if (c == '0' && cmdcnt < 1) { dot_begin(); // this was a standalone zero } else { cmdcnt = cmdcnt * 10 + (c - '0'); // this 0 is part of a number } break; case ':': // :- the colon mode commands p = get_input_line((Byte *) ":"); // get input line- use "status line" #ifdef BB_FEATURE_VI_COLON colon(p); // execute the command #else /* BB_FEATURE_VI_COLON */ if (*p == ':') p++; // move past the ':' cnt = strlen((char *) p); if (cnt <= 0) break; if (strncasecmp((char *) p, "quit", cnt) == 0 || strncasecmp((char *) p, "q!", cnt) == 0) { // delete lines if (file_modified == TRUE && p[1] != '!') { psbs("No write since last change (:quit! overrides)"); } else { editing = 0; } } else if (strncasecmp((char *) p, "write", cnt) == 0 || strncasecmp((char *) p, "wq", cnt) == 0) { cnt = file_write(cfn, text, end - 1); file_modified = FALSE; psb("\"%s\" %dL, %dC", cfn, count_lines(text, end - 1), cnt); if (p[1] == 'q') { editing = 0; } } else if (strncasecmp((char *) p, "file", cnt) == 0 ) { edit_status(); // show current file status } else if (sscanf((char *) p, "%d", &j) > 0) { dot = find_line(j); // go to line # j dot_skip_over_ws(); } else { // unrecognised cmd ni((Byte *) p); } #endif /* BB_FEATURE_VI_COLON */ break; case '<': // <- Left shift something case '>': // >- Right shift something cnt = count_lines(text, dot); // remember what line we are on c1 = get_one_char(); // get the type of thing to delete find_range(&p, &q, c1); (void) yank_delete(p, q, 1, YANKONLY); // save copy before change p = begin_line(p); q = end_line(q); i = count_lines(p, q); // # of lines we are shifting for ( ; i > 0; i--, p = next_line(p)) { if (c == '<') { // shift left- remove tab or 8 spaces if (*p == '\t') { // shrink buffer 1 char (void) text_hole_delete(p, p); } else if (*p == ' ') { // we should be calculating columns, not just SPACE for (j = 0; *p == ' ' && j < tabstop; j++) { (void) text_hole_delete(p, p); } } } else if (c == '>') { // shift right -- add tab or 8 spaces (void) char_insert(p, '\t'); } } dot = find_line(cnt); // what line were we on dot_skip_over_ws(); end_cmd_q(); // stop adding to q break; case 'A': // A- append at e-o-l dot_end(); // go to e-o-l //**** fall thru to ... 'a' case 'a': // a- append after current char if (*dot != '\n') dot++; goto dc_i; break; case 'B': // B- back a blank-delimited Word case 'E': // E- end of a blank-delimited word case 'W': // W- forward a blank-delimited word if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dir = FORWARD; if (c == 'B') dir = BACK; if (c == 'W' || isspace(dot[dir])) { dot = skip_thing(dot, 1, dir, S_TO_WS); dot = skip_thing(dot, 2, dir, S_OVER_WS); } if (c != 'W') dot = skip_thing(dot, 1, dir, S_BEFORE_WS); break; case 'C': // C- Change to e-o-l case 'D': // D- delete to e-o-l save_dot = dot; dot = dollar_line(dot); // move to before NL // copy text into a register and delete dot = yank_delete(save_dot, dot, 0, YANKDEL); // delete to e-o-l if (c == 'C') goto dc_i; // start inserting #ifdef BB_FEATURE_VI_DOT_CMD if (c == 'D') end_cmd_q(); // stop adding to q #endif /* BB_FEATURE_VI_DOT_CMD */ break; case 'G': // G- goto to a line number (default= E-O-F) dot = end - 1; // assume E-O-F if (cmdcnt > 0) { dot = find_line(cmdcnt); // what line is #cmdcnt } dot_skip_over_ws(); break; case 'H': // H- goto top line on screen dot = screenbegin; if (cmdcnt > (rows - 1)) { cmdcnt = (rows - 1); } if (cmdcnt-- > 1) { do_cmd('+'); } // repeat cnt dot_skip_over_ws(); break; case 'I': // I- insert before first non-blank dot_begin(); // 0 dot_skip_over_ws(); //**** fall thru to ... 'i' case 'i': // i- insert before current char case VI_K_INSERT: // Cursor Key Insert dc_i: cmd_mode = 1; // start insrting psb("-- Insert --"); break; case 'J': // J- join current and next lines together if (cmdcnt-- > 2) { do_cmd(c); } // repeat cnt dot_end(); // move to NL if (dot < end - 1) { // make sure not last char in text[] *dot++ = ' '; // replace NL with space while (isblnk(*dot)) { // delete leading WS dot_delete(); } } end_cmd_q(); // stop adding to q break; case 'L': // L- goto bottom line on screen dot = end_screen(); if (cmdcnt > (rows - 1)) { cmdcnt = (rows - 1); } if (cmdcnt-- > 1) { do_cmd('-'); } // repeat cnt dot_begin(); dot_skip_over_ws(); break; case 'M': // M- goto middle line on screen dot = screenbegin; for (cnt = 0; cnt < (rows-1) / 2; cnt++) dot = next_line(dot); break; case 'O': // O- open a empty line above // 0i\n ESC -i p = begin_line(dot); if (p[-1] == '\n') { dot_prev(); case 'o': // o- open a empty line below; Yes, I know it is in the middle of the "if (..." dot_end(); dot = char_insert(dot, '\n'); } else { dot_begin(); // 0 dot = char_insert(dot, '\n'); // i\n ESC dot_prev(); // - } goto dc_i; break; case 'R': // R- continuous Replace char dc5: cmd_mode = 2; psb("-- Replace --"); break; case 'X': // X- delete char before dot case 'x': // x- delete the current char case 's': // s- substitute the current char if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dir = 0; if (c == 'X') dir = -1; if (dot[dir] != '\n') { if (c == 'X') dot--; // delete prev char dot = yank_delete(dot, dot, 0, YANKDEL); // delete char } if (c == 's') goto dc_i; // start insrting end_cmd_q(); // stop adding to q break; case 'Z': // Z- if modified, {write}; exit // ZZ means to save file (if necessary), then exit c1 = get_one_char(); if (c1 != 'Z') { indicate_error(c); break; } if (file_modified == TRUE #ifdef BB_FEATURE_VI_READONLY && vi_readonly == FALSE && readonly == FALSE #endif /* BB_FEATURE_VI_READONLY */ ) { cnt = file_write(cfn, text, end - 1); if (cnt == (end - 1 - text + 1)) { editing = 0; } } else { editing = 0; } break; case '^': // ^- move to first non-blank on line dot_begin(); dot_skip_over_ws(); break; case 'b': // b- back a word case 'e': // e- end of word if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dir = FORWARD; if (c == 'b') dir = BACK; if ((dot + dir) < text || (dot + dir) > end - 1) break; dot += dir; if (isspace(*dot)) { dot = skip_thing(dot, (c == 'e') ? 2 : 1, dir, S_OVER_WS); } if (isalnum(*dot) || *dot == '_') { dot = skip_thing(dot, 1, dir, S_END_ALNUM); } else if (ispunct(*dot)) { dot = skip_thing(dot, 1, dir, S_END_PUNCT); } break; case 'c': // c- change something case 'd': // d- delete something #ifdef BB_FEATURE_VI_YANKMARK case 'y': // y- yank something case 'Y': // Y- Yank a line #endif /* BB_FEATURE_VI_YANKMARK */ yf = YANKDEL; // assume either "c" or "d" #ifdef BB_FEATURE_VI_YANKMARK if (c == 'y' || c == 'Y') yf = YANKONLY; #endif /* BB_FEATURE_VI_YANKMARK */ c1 = 'y'; if (c != 'Y') c1 = get_one_char(); // get the type of thing to delete find_range(&p, &q, c1); if (c1 == 27) { // ESC- user changed mind and wants out c = c1 = 27; // Escape- do nothing } else if (strchr("wW", c1)) { if (c == 'c') { // don't include trailing WS as part of word while (isblnk(*q)) { if (q <= text || q[-1] == '\n') break; q--; } } dot = yank_delete(p, q, 0, yf); // delete word } else if (strchr("^0bBeEft$", c1)) { // single line copy text into a register and delete dot = yank_delete(p, q, 0, yf); // delete word } else if (strchr("cdykjHL%+-{}\r\n", c1)) { // multiple line copy text into a register and delete dot = yank_delete(p, q, 1, yf); // delete lines if (c == 'c') { dot = char_insert(dot, '\n'); // on the last line of file don't move to prev line if (dot != (end-1)) { dot_prev(); } } else if (c == 'd') { dot_begin(); dot_skip_over_ws(); } } else { // could not recognize object c = c1 = 27; // error- indicate_error(c); } if (c1 != 27) { // if CHANGING, not deleting, start inserting after the delete if (c == 'c') { strcpy((char *) buf, "Change"); goto dc_i; // start inserting } if (c == 'd') { strcpy((char *) buf, "Delete"); } #ifdef BB_FEATURE_VI_YANKMARK if (c == 'y' || c == 'Y') { strcpy((char *) buf, "Yank"); } p = reg[YDreg]; q = p + strlen((char *) p); for (cnt = 0; p <= q; p++) { if (*p == '\n') cnt++; } psb("%s %d lines (%d chars) using [%c]", buf, cnt, strlen((char *) reg[YDreg]), what_reg()); #endif /* BB_FEATURE_VI_YANKMARK */ end_cmd_q(); // stop adding to q } break; case 'k': // k- goto prev line, same col case VI_K_UP: // cursor key Up if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt dot_prev(); dot = move_to_col(dot, ccol + offset); // try stay in same col break; case 'r': // r- replace the current char with user input c1 = get_one_char(); // get the replacement char if (*dot != '\n') { *dot = c1; file_modified = TRUE; // has the file been modified } end_cmd_q(); // stop adding to q break; case 't': // t- move to char prior to next x last_forward_char = get_one_char(); do_cmd(';'); if (*dot == last_forward_char) dot_left(); last_forward_char= 0; break; case 'w': // w- forward a word if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt if (isalnum(*dot) || *dot == '_') { // we are on ALNUM dot = skip_thing(dot, 1, FORWARD, S_END_ALNUM); } else if (ispunct(*dot)) { // we are on PUNCT dot = skip_thing(dot, 1, FORWARD, S_END_PUNCT); } if (dot < end - 1) dot++; // move over word if (isspace(*dot)) { dot = skip_thing(dot, 2, FORWARD, S_OVER_WS); } break; case 'z': // z- c1 = get_one_char(); // get the replacement char cnt = 0; if (c1 == '.') cnt = (rows - 2) / 2; // put dot at center if (c1 == '-') cnt = rows - 2; // put dot at bottom screenbegin = begin_line(dot); // start dot at top dot_scroll(cnt, -1); break; case '|': // |- move to column "cmdcnt" dot = move_to_col(dot, cmdcnt - 1); // try to move to column break; case '~': // ~- flip the case of letters a-z -> A-Z if (cmdcnt-- > 1) { do_cmd(c); } // repeat cnt if (islower(*dot)) { *dot = toupper(*dot); file_modified = TRUE; // has the file been modified } else if (isupper(*dot)) { *dot = tolower(*dot); file_modified = TRUE; // has the file been modified } dot_right(); end_cmd_q(); // stop adding to q break; //----- The Cursor and Function Keys ----------------------------- case VI_K_HOME: // Cursor Key Home dot_begin(); break; // The Fn keys could point to do_macro which could translate them case VI_K_FUN1: // Function Key F1 case VI_K_FUN2: // Function Key F2 case VI_K_FUN3: // Function Key F3 case VI_K_FUN4: // Function Key F4 case VI_K_FUN5: // Function Key F5 case VI_K_FUN6: // Function Key F6 case VI_K_FUN7: // Function Key F7 case VI_K_FUN8: // Function Key F8 case VI_K_FUN9: // Function Key F9 case VI_K_FUN10: // Function Key F10 case VI_K_FUN11: // Function Key F11 case VI_K_FUN12: // Function Key F12 break; } dc1: // if text[] just became empty, add back an empty line if (end == text) { (void) char_insert(text, '\n'); // start empty buf with dummy line dot = text; } // 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 } #ifdef BB_FEATURE_VI_YANKMARK check_context(c); // update the current context #endif /* BB_FEATURE_VI_YANKMARK */ if (!isdigit(c)) cmdcnt = 0; // cmd was not a number, reset cmdcnt cnt = dot - begin_line(dot); // Try to stay off of the Newline if (*dot == '\n' && cnt > 0 && cmd_mode == 0) dot--; } //----- The Colon commands ------------------------------------- #ifdef BB_FEATURE_VI_COLON static Byte *get_one_address(Byte * p, int *addr) // get colon addr, if present { int st; Byte *q; #ifdef BB_FEATURE_VI_YANKMARK Byte c; #endif /* BB_FEATURE_VI_YANKMARK */ #ifdef BB_FEATURE_VI_SEARCH Byte *pat, buf[BUFSIZ]; #endif /* BB_FEATURE_VI_SEARCH */ *addr = -1; // assume no addr if (*p == '.') { // the current line p++; q = begin_line(dot); *addr = count_lines(text, q); #ifdef BB_FEATURE_VI_YANKMARK } else if (*p == '\'') { // is this a mark addr p++; c = tolower(*p); p++; if (c >= 'a' && c <= 'z') { // we have a mark c = c - 'a'; q = mark[(int) c]; if (q != NULL) { // is mark valid *addr = count_lines(text, q); // count lines } } #endif /* BB_FEATURE_VI_YANKMARK */ #ifdef BB_FEATURE_VI_SEARCH } else if (*p == '/') { // a search pattern q = buf; for (p++; *p; p++) { if (*p == '/') break; *q++ = *p; *q = '\0'; } pat = (Byte *) strdup((char *) buf); // save copy of pattern if (*p == '/') p++; q = char_search(dot, pat, FORWARD, FULL); if (q != NULL) { *addr = count_lines(text, q); } free(pat); #endif /* BB_FEATURE_VI_SEARCH */ } else if (*p == '$') { // the last line in file p++; q = begin_line(end - 1); *addr = count_lines(text, q); } else if (isdigit(*p)) { // specific line number sscanf((char *) p, "%d%n", addr, &st); p += st; } else { // I don't reconise this // unrecognised address- assume -1 *addr = -1; } return (p); } static Byte *get_address(Byte *p, int *b, int *e) // get two colon addrs, if present { //----- get the address' i.e., 1,3 'a,'b ----- // get FIRST addr, if present while (isblnk(*p)) p++; // skip over leading spaces if (*p == '%') { // alias for 1,$ p++; *b = 1; *e = count_lines(text, end-1); goto ga0; } p = get_one_address(p, b); while (isblnk(*p)) p++; if (*p == ',') { // is there a address seperator p++; while (isblnk(*p)) p++; // get SECOND addr, if present p = get_one_address(p, e); } ga0: while (isblnk(*p)) p++; // skip over trailing spaces return (p); } static void colon(Byte * buf) { Byte c, *orig_buf, *buf1, *q, *r; Byte *fn, cmd[BUFSIZ], args[BUFSIZ]; int i, l, li, ch, st, b, e; int useforce, forced; struct stat st_buf; // :3154 // if (-e line 3154) goto it else stay put // :4,33w! foo // write a portion of buffer to file "foo" // :w // write all of buffer to current file // :q // quit // :q! // quit- dont care about modified file // :'a,'z!sort -u // filter block through sort // :'f // goto mark "f" // :'fl // list literal the mark "f" line // :.r bar // read file "bar" into buffer before dot // :/123/,/abc/d // delete lines from "123" line to "abc" line // :/xyz/ // goto the "xyz" line // :s/find/replace/ // substitute pattern "find" with "replace" // :!<cmd> // run <cmd> then return // if (strlen((char *) buf) <= 0) goto vc1; if (*buf == ':') buf++; // move past the ':' forced = useforce = FALSE; li = st = ch = i = 0; b = e = -1; q = text; // assume 1,$ for the range r = end - 1; li = count_lines(text, end - 1); fn = cfn; // default to current file memset(cmd, '\0', BUFSIZ); // clear cmd[] memset(args, '\0', BUFSIZ); // clear args[] // look for optional address(es) :. :1 :1,9 :'q,'a :% buf = get_address(buf, &b, &e); // remember orig command line orig_buf = buf; // get the COMMAND into cmd[] buf1 = cmd; while (*buf != '\0') { if (isspace(*buf)) break; *buf1++ = *buf++; } // get any ARGuments while (isblnk(*buf)) buf++; strcpy((char *) args, (char *) buf); buf1 = last_char_is((char *)cmd, '!'); if (buf1) { useforce = TRUE; *buf1 = '\0'; // get rid of ! } if (b >= 0) { // if there is only one addr, then the addr // is the line number of the single line the // user wants. So, reset the end // pointer to point at end of the "b" line q = find_line(b); // what line is #b r = end_line(q); li = 1; } if (e >= 0) { // we were given two addrs. change the // end pointer to the addr given by user. r = find_line(e); // what line is #e r = end_line(r); li = e - b + 1; } // ------------ now look for the command ------------ i = strlen((char *) cmd); if (i == 0) { // :123CR goto line #123 if (b >= 0) { dot = find_line(b); // what line is #b dot_skip_over_ws(); } } else if (strncmp((char *) cmd, "!", 1) == 0) { // run a cmd // :!ls run the <cmd> (void) alarm(0); // wait for input- no alarms place_cursor(rows - 1, 0, FALSE); // go to Status line clear_to_eol(); // clear the line cookmode(); system(orig_buf+1); // run the cmd rawmode(); Hit_Return(); // let user see results (void) alarm(3); // done waiting for input } else if (strncmp((char *) cmd, "=", i) == 0) { // where is the address if (b < 0) { // no addr given- use defaults b = e = count_lines(text, dot); } psb("%d", b); } else if (strncasecmp((char *) cmd, "delete", i) == 0) { // delete lines if (b < 0) { // no addr given- use defaults q = begin_line(dot); // assume .,. for the range r = end_line(dot); } dot = yank_delete(q, r, 1, YANKDEL); // save, then delete lines dot_skip_over_ws(); } else if (strncasecmp((char *) cmd, "edit", i) == 0) { // Edit a file int sr; sr= 0; // don't edit, if the current file has been modified if (file_modified == TRUE && useforce != TRUE) { psbs("No write since last change (:edit! overrides)"); goto vc1; } if (strlen(args) > 0) { // the user supplied a file name fn= args; } else if (cfn != 0 && strlen(cfn) > 0) { // no user supplied name- use the current filename fn= cfn; goto vc5; } else { // no user file name, no current name- punt psbs("No current filename"); goto vc1; } // see if file exists- if not, its just a new file request if ((sr=stat((char*)fn, &st_buf)) < 0) { // This is just a request for a new file creation. // The file_insert below will fail but we get // an empty buffer with a file name. Then the "write" // command can do the create. } else { if ((st_buf.st_mode & (S_IFREG)) == 0) { // This is not a regular file psbs("\"%s\" is not a regular file", fn); goto vc1; } if ((st_buf.st_mode & (S_IRUSR | S_IRGRP | S_IROTH)) == 0) { // dont have any read permissions psbs("\"%s\" is not readable", fn); goto vc1; } } // There is a read-able regular file // make this the current file q = (Byte *) strdup((char *) fn); // save the cfn if (cfn != 0) free(cfn); // free the old name cfn = q; // remember new cfn vc5: // delete all the contents of text[] new_text(2 * file_size(fn)); screenbegin = dot = end = text; // insert new file ch = file_insert(fn, text, file_size(fn)); if (ch < 1) { // start empty buf with dummy line (void) char_insert(text, '\n'); ch= 1; } file_modified = FALSE; #ifdef BB_FEATURE_VI_YANKMARK if (Ureg >= 0 && Ureg < 28 && reg[Ureg] != 0) { free(reg[Ureg]); // free orig line reg- for 'U' reg[Ureg]= 0; } if (YDreg >= 0 && YDreg < 28 && reg[YDreg] != 0) { free(reg[YDreg]); // free default yank/delete register reg[YDreg]= 0; } for (li = 0; li < 28; li++) { mark[li] = 0; } // init the marks #endif /* BB_FEATURE_VI_YANKMARK */ // how many lines in text[]? li = count_lines(text, end - 1); psb("\"%s\"%s" #ifdef BB_FEATURE_VI_READONLY "%s" #endif /* BB_FEATURE_VI_READONLY */ " %dL, %dC", cfn, (sr < 0 ? " [New file]" : ""), #ifdef BB_FEATURE_VI_READONLY ((vi_readonly == TRUE || readonly == TRUE) ? " [Read only]" : ""), #endif /* BB_FEATURE_VI_READONLY */ li, ch); } else if (strncasecmp((char *) cmd, "file", i) == 0) { // what File is this if (b != -1 || e != -1) { ni((Byte *) "No address allowed on this command"); goto vc1; } if (strlen((char *) args) > 0) { // user wants a new filename if (cfn != NULL) free(cfn); cfn = (Byte *) strdup((char *) args); } else { // user wants file status info edit_status(); } } else if (strncasecmp((char *) cmd, "features", i) == 0) { // what features are available // print out values of all features place_cursor(rows - 1, 0, FALSE); // go to Status line, bottom of screen clear_to_eol(); // clear the line cookmode(); show_help(); rawmode(); Hit_Return(); } else if (strncasecmp((char *) cmd, "list", i) == 0) { // literal print line if (b < 0) { // no addr given- use defaults q = begin_line(dot); // assume .,. for the range r = end_line(dot); } place_cursor(rows - 1, 0, FALSE); // go to Status line, bottom of screen clear_to_eol(); // clear the line write(1, "\r\n", 2); for (; q <= r; q++) { c = *q; if (c > '~') standout_start(); if (c == '\n') { write(1, "$\r", 2); } else if (*q < ' ') { write(1, "^", 1); c += '@'; } write(1, &c, 1); if (c > '~') standout_end(); } #ifdef BB_FEATURE_VI_SET vc2: #endif /* BB_FEATURE_VI_SET */ Hit_Return(); } else if ((strncasecmp((char *) cmd, "quit", i) == 0) || // Quit (strncasecmp((char *) cmd, "next", i) == 0)) { // edit next file if (useforce == TRUE) { // force end of argv list if (*cmd == 'q') { optind = save_argc; } editing = 0; goto vc1; } // don't exit if the file been modified if (file_modified == TRUE) { psbs("No write since last change (:%s! overrides)", (*cmd == 'q' ? "quit" : "next")); goto vc1; } // are there other file to edit if (*cmd == 'q' && optind < save_argc - 1) { psbs("%d more file to edit", (save_argc - optind - 1)); goto vc1; } if (*cmd == 'n' && optind >= save_argc - 1) { psbs("No more files to edit"); goto vc1; } editing = 0; } else if (strncasecmp((char *) cmd, "read", i) == 0) { // read file into text[] fn = args; if (strlen((char *) fn) <= 0) { psbs("No filename given"); goto vc1; } if (b < 0) { // no addr given- use defaults q = begin_line(dot); // assume "dot" } // read after current line- unless user said ":0r foo" if (b != 0) q = next_line(q); l= readonly; // remember current files' status ch = file_insert(fn, q, file_size(fn)); readonly= l; if (ch < 0) goto vc1; // nothing was inserted // how many lines in text[]? li = count_lines(q, q + ch - 1); psb("\"%s\"" #ifdef BB_FEATURE_VI_READONLY "%s" #endif /* BB_FEATURE_VI_READONLY */ " %dL, %dC", fn, #ifdef BB_FEATURE_VI_READONLY ((vi_readonly == TRUE || readonly == TRUE) ? " [Read only]" : ""), #endif /* BB_FEATURE_VI_READONLY */ li, ch); if (ch > 0) { // if the insert is before "dot" then we need to update if (q <= dot) dot += ch; file_modified = TRUE; } } else if (strncasecmp((char *) cmd, "rewind", i) == 0) { // rewind cmd line args if (file_modified == TRUE && useforce != TRUE) { psbs("No write since last change (:rewind! overrides)"); } else { // reset the filenames to edit optind = fn_start - 1; editing = 0; } #ifdef BB_FEATURE_VI_SET } else if (strncasecmp((char *) cmd, "set", i) == 0) { // set or clear features i = 0; // offset into args if (strlen((char *) args) == 0) { // print out values of all options place_cursor(rows - 1, 0, FALSE); // go to Status line, bottom of screen clear_to_eol(); // clear the line printf("----------------------------------------\r\n"); #ifdef BB_FEATURE_VI_SETOPTS if (!autoindent) printf("no"); printf("autoindent "); if (!err_method) printf("no"); printf("flash "); if (!ignorecase) printf("no"); printf("ignorecase "); if (!showmatch) printf("no"); printf("showmatch "); printf("tabstop=%d ", tabstop); #endif /* BB_FEATURE_VI_SETOPTS */ printf("\r\n"); goto vc2; } if (strncasecmp((char *) args, "no", 2) == 0) i = 2; // ":set noautoindent" #ifdef BB_FEATURE_VI_SETOPTS if (strncasecmp((char *) args + i, "autoindent", 10) == 0 || strncasecmp((char *) args + i, "ai", 2) == 0) { autoindent = (i == 2) ? 0 : 1; } if (strncasecmp((char *) args + i, "flash", 5) == 0 || strncasecmp((char *) args + i, "fl", 2) == 0) { err_method = (i == 2) ? 0 : 1; } if (strncasecmp((char *) args + i, "ignorecase", 10) == 0 || strncasecmp((char *) args + i, "ic", 2) == 0) { ignorecase = (i == 2) ? 0 : 1; } if (strncasecmp((char *) args + i, "showmatch", 9) == 0 || strncasecmp((char *) args + i, "sm", 2) == 0) { showmatch = (i == 2) ? 0 : 1; } if (strncasecmp((char *) args + i, "tabstop", 7) == 0) { sscanf(strchr((char *) args + i, '='), "=%d", &ch); if (ch > 0 && ch < columns - 1) tabstop = ch; } #endif /* BB_FEATURE_VI_SETOPTS */ #endif /* BB_FEATURE_VI_SET */ #ifdef BB_FEATURE_VI_SEARCH } else if (strncasecmp((char *) cmd, "s", 1) == 0) { // substitute a pattern with a replacement pattern Byte *ls, *F, *R; int gflag; // F points to the "find" pattern // R points to the "replace" pattern // replace the cmd line delimiters "/" with NULLs gflag = 0; // global replace flag c = orig_buf[1]; // what is the delimiter F = orig_buf + 2; // start of "find" R = (Byte *) strchr((char *) F, c); // middle delimiter if (!R) goto colon_s_fail; *R++ = '\0'; // terminate "find" buf1 = (Byte *) strchr((char *) R, c); if (!buf1) goto colon_s_fail; *buf1++ = '\0'; // terminate "replace" if (*buf1 == 'g') { // :s/foo/bar/g buf1++; gflag++; // turn on gflag } q = begin_line(q); if (b < 0) { // maybe :s/foo/bar/ q = begin_line(dot); // start with cur line b = count_lines(text, q); // cur line number } if (e < 0) e = b; // maybe :.s/foo/bar/ for (i = b; i <= e; i++) { // so, :20,23 s \0 find \0 replace \0 ls = q; // orig line start vc4: buf1 = char_search(q, F, FORWARD, LIMITED); // search cur line only for "find" if (buf1 != NULL) { // we found the "find" pattern- delete it (void) text_hole_delete(buf1, buf1 + strlen((char *) F) - 1); // inset the "replace" patern (void) string_insert(buf1, R); // insert the string // check for "global" :s/foo/bar/g if (gflag == 1) { if ((buf1 + strlen((char *) R)) < end_line(ls)) { q = buf1 + strlen((char *) R); goto vc4; // don't let q move past cur line } } } q = next_line(ls); } #endif /* BB_FEATURE_VI_SEARCH */ } else if (strncasecmp((char *) cmd, "version", i) == 0) { // show software version psb("%s", vi_Version); } else if ((strncasecmp((char *) cmd, "write", i) == 0) || // write text to file (strncasecmp((char *) cmd, "wq", i) == 0)) { // write text to file // is there a file name to write to? if (strlen((char *) args) > 0) { fn = args; } #ifdef BB_FEATURE_VI_READONLY if ((vi_readonly == TRUE || readonly == TRUE) && useforce == FALSE) { psbs("\"%s\" File is read only", fn); goto vc3; } #endif /* BB_FEATURE_VI_READONLY */ // how many lines in text[]? li = count_lines(q, r); ch = r - q + 1; // see if file exists- if not, its just a new file request if (useforce == TRUE) { // if "fn" is not write-able, chmod u+w // sprintf(syscmd, "chmod u+w %s", fn); // system(syscmd); forced = TRUE; } l = file_write(fn, q, r); if (useforce == TRUE && forced == TRUE) { // chmod u-w // sprintf(syscmd, "chmod u-w %s", fn); // system(syscmd); forced = FALSE; } psb("\"%s\" %dL, %dC", fn, li, l); if (q == text && r == end - 1 && l == ch) file_modified = FALSE; if (cmd[1] == 'q' && l == ch) { editing = 0; } #ifdef BB_FEATURE_VI_READONLY vc3:; #endif /* BB_FEATURE_VI_READONLY */ #ifdef BB_FEATURE_VI_YANKMARK } else if (strncasecmp((char *) cmd, "yank", i) == 0) { // yank lines if (b < 0) { // no addr given- use defaults q = begin_line(dot); // assume .,. for the range r = end_line(dot); } text_yank(q, r, YDreg); li = count_lines(q, r); psb("Yank %d lines (%d chars) into [%c]", li, strlen((char *) reg[YDreg]), what_reg()); #endif /* BB_FEATURE_VI_YANKMARK */ } else { // cmd unknown ni((Byte *) cmd); } vc1: dot = bound_dot(dot); // make sure "dot" is valid return; #ifdef BB_FEATURE_VI_SEARCH colon_s_fail: psb(":s expression missing delimiters"); return; #endif } static void Hit_Return(void) { char c; standout_start(); // start reverse video write(1, "[Hit return to continue]", 24); standout_end(); // end reverse video while ((c = get_one_char()) != '\n' && c != '\r') /*do nothing */ ; redraw(TRUE); // force redraw all } #endif /* BB_FEATURE_VI_COLON */ //----- Synchronize the cursor to Dot -------------------------- static void sync_cursor(Byte * d, int *row, int *col) { Byte *beg_cur, *end_cur; // begin and end of "d" line Byte *beg_scr, *end_scr; // begin and end of screen Byte *tp; int cnt, ro, co; beg_cur = begin_line(d); // first char of cur line end_cur = end_line(d); // last char of cur line beg_scr = end_scr = screenbegin; // first char of screen end_scr = end_screen(); // last char of screen 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 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; do { // drive "co" to correct column if (*tp == '\n' || *tp == '\0') break; if (*tp == '\t') { // 7 - (co % 8 ) co += ((tabstop - 1) - (co % tabstop)); } else if (*tp < ' ') { co++; // display as ^X, use 2 columns } } while (tp++ < d && ++co); // "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 Byte *begin_line(Byte * p) // return pointer to first char cur line { while (p > text && p[-1] != '\n') p--; // go to cur line B-o-l return (p); } static Byte *end_line(Byte * p) // return pointer to NL of cur line line { while (p < end - 1 && *p != '\n') p++; // go to cur line E-o-l return (p); } static Byte *dollar_line(Byte * p) // return pointer to just before NL line { while (p < end - 1 && *p != '\n') p++; // go to cur line E-o-l // Try to stay off of the Newline if (*p == '\n' && (p - begin_line(p)) > 0) p--; return (p); } static Byte *prev_line(Byte * p) // return pointer first char prev line { p = begin_line(p); // goto begining of cur line if (p[-1] == '\n' && p > text) p--; // step to prev line p = begin_line(p); // goto begining of prev line return (p); } static Byte *next_line(Byte * p) // return pointer first char next line { p = end_line(p); if (*p == '\n' && p < end - 1) p++; // step to next line return (p); } //----- Text Information Routines ------------------------------ static Byte *end_screen(void) { Byte *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); } static int count_lines(Byte * start, Byte * stop) // count line from start to stop { Byte *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); // get to end of this line for (q = start; q <= stop && q <= end - 1; q++) { if (*q == '\n') cnt++; } return (cnt); } static Byte *find_line(int li) // find begining of line #li { Byte *q; for (q = text; li > 1; li--) { q = next_line(q); } return (q); } //----- Dot Movement Routines ---------------------------------- static void dot_left(void) { if (dot > text && dot[-1] != '\n') |