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[/] [eco32/] [tags/] [eco32-0.23/] [sim/] [getline/] [getline.c] - Rev 284
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#ifndef lint static char rcsid[] = "$Id: getline.c,v 3.11 1993/12/02 15:54:31 thewalt Exp thewalt $"; static char *copyright = "Copyright (C) 1991, 1992, 1993, Chris Thewalt"; #endif /* * Copyright (C) 1991, 1992, 1993 by Chris Thewalt (thewalt@ce.berkeley.edu) * * Permission to use, copy, modify, and distribute this software * for any purpose and without fee is hereby granted, provided * that the above copyright notices appear in all copies and that both the * copyright notice and this permission notice appear in supporting * documentation. This software is provided "as is" without express or * implied warranty. * * Thanks to the following people who have provided enhancements and fixes: * Ron Ueberschaer, Christoph Keller, Scott Schwartz, Steven List, * DaviD W. Sanderson, Goran Bostrom, Michael Gleason, Glenn Kasten, * Edin Hodzic, Eric J Bivona, Kai Uwe Rommel, Danny Quah, Ulrich Betzler */ #include "getline.h" static int gl_tab(); /* forward reference needed for gl_tab_hook */ /******************** imported interface *********************************/ #include <string.h> #include <ctype.h> #include <errno.h> #include <signal.h> extern int isatty(); extern void *malloc(); extern void free(); /********************* exported interface ********************************/ char *gl_getline(); /* read a line of input */ void gl_setwidth(); /* specify width of screen */ void gl_histadd(); /* adds entries to hist */ void gl_strwidth(); /* to bind gl_strlen */ int (*gl_in_hook)() = 0; int (*gl_out_hook)() = 0; int (*gl_tab_hook)() = gl_tab; /******************** internal interface *********************************/ #define BUF_SIZE 1024 static int gl_init_done = -1; /* terminal mode flag */ static int gl_termw = 80; /* actual terminal width */ static int gl_scroll = 27; /* width of EOL scrolling region */ static int gl_width = 0; /* net size available for input */ static int gl_extent = 0; /* how far to redraw, 0 means all */ static int gl_overwrite = 0; /* overwrite mode */ static int gl_pos, gl_cnt = 0; /* position and size of input */ static char gl_buf[BUF_SIZE]; /* input buffer */ static char gl_killbuf[BUF_SIZE]=""; /* killed text */ static char *gl_prompt; /* to save the prompt string */ static char gl_intrc = 0; /* keyboard SIGINT char */ static char gl_quitc = 0; /* keyboard SIGQUIT char */ static char gl_suspc = 0; /* keyboard SIGTSTP char */ static char gl_dsuspc = 0; /* delayed SIGTSTP char */ static int gl_search_mode = 0; /* search mode flag */ static void gl_init(); /* prepare to edit a line */ static void gl_cleanup(); /* to undo gl_init */ static void gl_char_init(); /* get ready for no echo input */ static void gl_char_cleanup(); /* undo gl_char_init */ static size_t (*gl_strlen)() = (size_t(*)())strlen; /* returns printable prompt width */ static void gl_addchar(); /* install specified char */ static void gl_del(); /* del, either left (-1) or cur (0) */ static void gl_error(); /* write error msg and die */ static void gl_fixup(); /* fixup state variables and screen */ static int gl_getc(); /* read one char from terminal */ static void gl_kill(); /* delete to EOL */ static void gl_newline(); /* handle \n or \r */ static void gl_putc(); /* write one char to terminal */ static void gl_puts(); /* write a line to terminal */ static void gl_redraw(); /* issue \n and redraw all */ static void gl_transpose(); /* transpose two chars */ static void gl_yank(); /* yank killed text */ static void gl_word(); /* move a word */ static void hist_init(); /* initializes hist pointers */ static char *hist_next(); /* return ptr to next item */ static char *hist_prev(); /* return ptr to prev item */ static char *hist_save(); /* makes copy of a string, without NL */ static void search_addchar(); /* increment search string */ static void search_term(); /* reset with current contents */ static void search_back(); /* look back for current string */ static void search_forw(); /* look forw for current string */ /************************ nonportable part *********************************/ extern int write(); extern void exit(); #ifdef unix #ifndef __unix__ #define __unix__ #endif /* not __unix__ */ #endif /* unix */ #ifdef _IBMR2 #ifndef __unix__ #define __unix__ #endif #endif #ifdef __GO32__ #include <pc.h> #undef MSDOS #undef __unix__ #endif #ifdef MSDOS #include <bios.h> #endif #ifdef __unix__ #ifndef __convexc__ extern int read(); extern int kill(); extern int ioctl(); #endif /* not __convexc__ */ #ifdef POSIX /* use POSIX interface */ #include <termios.h> struct termios new_termios, old_termios; #else /* not POSIX */ #include <sys/ioctl.h> #ifdef M_XENIX /* does not really use bsd terminal interface */ #undef TIOCSETN #endif /* M_XENIX */ #ifdef TIOCSETN /* use BSD interface */ #include <sgtty.h> struct sgttyb new_tty, old_tty; struct tchars tch; struct ltchars ltch; #else /* use SYSV interface */ #include <termio.h> struct termio new_termio, old_termio; #endif /* TIOCSETN */ #endif /* POSIX */ #endif /* __unix__ */ #ifdef vms #include <descrip.h> #include <ttdef.h> #include <iodef.h> #include unixio static int setbuff[2]; /* buffer to set terminal attributes */ static short chan = -1; /* channel to terminal */ struct dsc$descriptor_s descrip; /* VMS descriptor */ #endif static void gl_char_init() /* turn off input echo */ { #ifdef __unix__ #ifdef POSIX tcgetattr(0, &old_termios); gl_intrc = old_termios.c_cc[VINTR]; gl_quitc = old_termios.c_cc[VQUIT]; #ifdef VSUSP gl_suspc = old_termios.c_cc[VSUSP]; #endif #ifdef VDSUSP gl_dsuspc = old_termios.c_cc[VDSUSP]; #endif new_termios = old_termios; new_termios.c_iflag &= ~(BRKINT|ISTRIP|IXON|IXOFF); new_termios.c_iflag |= (IGNBRK|IGNPAR); new_termios.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO); new_termios.c_cc[VMIN] = 1; new_termios.c_cc[VTIME] = 0; tcsetattr(0, TCSANOW, &new_termios); #else /* not POSIX */ #ifdef TIOCSETN /* BSD */ ioctl(0, TIOCGETC, &tch); ioctl(0, TIOCGLTC, <ch); gl_intrc = tch.t_intrc; gl_quitc = tch.t_quitc; gl_suspc = ltch.t_suspc; gl_dsuspc = ltch.t_dsuspc; ioctl(0, TIOCGETP, &old_tty); new_tty = old_tty; new_tty.sg_flags |= RAW; new_tty.sg_flags &= ~ECHO; ioctl(0, TIOCSETN, &new_tty); #else /* SYSV */ ioctl(0, TCGETA, &old_termio); gl_intrc = old_termio.c_cc[VINTR]; gl_quitc = old_termio.c_cc[VQUIT]; new_termio = old_termio; new_termio.c_iflag &= ~(BRKINT|ISTRIP|IXON|IXOFF); new_termio.c_iflag |= (IGNBRK|IGNPAR); new_termio.c_lflag &= ~(ICANON|ISIG|ECHO); new_termio.c_cc[VMIN] = 1; new_termio.c_cc[VTIME] = 0; ioctl(0, TCSETA, &new_termio); #endif /* TIOCSETN */ #endif /* POSIX */ #endif /* __unix__ */ #ifdef vms descrip.dsc$w_length = strlen("tt:"); descrip.dsc$b_dtype = DSC$K_DTYPE_T; descrip.dsc$b_class = DSC$K_CLASS_S; descrip.dsc$a_pointer = "tt:"; (void)sys$assign(&descrip,&chan,0,0); (void)sys$qiow(0,chan,IO$_SENSEMODE,0,0,0,setbuff,8,0,0,0,0); setbuff[1] |= TT$M_NOECHO; (void)sys$qiow(0,chan,IO$_SETMODE,0,0,0,setbuff,8,0,0,0,0); #endif /* vms */ } static void gl_char_cleanup() /* undo effects of gl_char_init */ { #ifdef __unix__ #ifdef POSIX tcsetattr(0, TCSANOW, &old_termios); #else /* not POSIX */ #ifdef TIOCSETN /* BSD */ ioctl(0, TIOCSETN, &old_tty); #else /* SYSV */ ioctl(0, TCSETA, &old_termio); #endif /* TIOCSETN */ #endif /* POSIX */ #endif /* __unix__ */ #ifdef vms setbuff[1] &= ~TT$M_NOECHO; (void)sys$qiow(0,chan,IO$_SETMODE,0,0,0,setbuff,8,0,0,0,0); sys$dassgn(chan); chan = -1; #endif } #if MSDOS || __EMX__ || __GO32__ int pc_keymap(c) int c; { switch (c) { case 72: c = 16; /* up -> ^P */ break; case 80: c = 14; /* down -> ^N */ break; case 75: c = 2; /* left -> ^B */ break; case 77: c = 6; /* right -> ^F */ break; default: c = 0; /* make it garbage */ } return c; } #endif /* MSDOS || __EMX__ || __GO32__ */ static int gl_getc() /* get a character without echoing it to screen */ { int c; #ifdef __unix__ char ch; #endif #ifdef __unix__ while ((c = read(0, &ch, 1)) == -1) { if (errno != EINTR) break; } c = (ch <= 0)? -1 : ch; #endif /* __unix__ */ #ifdef MSDOS c = _bios_keybrd(_NKEYBRD_READ); #endif /* MSDOS */ #ifdef __GO32__ c = getkey () ; if (c > 255) c = pc_keymap(c & 0377); #endif /* __GO32__ */ #ifdef __TURBOC__ while(!bioskey(1)) ; c = bioskey(0); #endif #if MSDOS || __TURBOC__ if ((c & 0377) == 224) { c = pc_keymap((c >> 8) & 0377); } else { c &= 0377; } #endif /* MSDOS || __TURBOC__ */ #ifdef __EMX__ c = _read_kbd(0, 1, 0); if (c == 224 || c == 0) { c = pc_keymap(_read_kbd(0, 1, 0)); } else { c &= 0377; } #endif #ifdef vms if(chan < 0) { c='\0'; } (void)sys$qiow(0,chan,IO$_TTYREADALL,0,0,0,&c,1,0,0,0,0); c &= 0177; /* get a char */ #endif return c; } static void gl_putc(c) int c; { char ch = c; write(1, &ch, 1); if (ch == '\n') { ch = '\r'; write(1, &ch, 1); /* RAW mode needs '\r', does not hurt */ } } /******************** fairly portable part *********************************/ static void gl_puts(buf) char *buf; { int len; if (buf) { len = strlen(buf); write(1, buf, len); } } static void gl_error(buf) char *buf; { int len = strlen(buf); gl_cleanup(); write(2, buf, len); exit(1); } static void gl_init() /* set up variables and terminal */ { if (gl_init_done < 0) { /* -1 only on startup */ hist_init(); } if (isatty(0) == 0 || isatty(1) == 0) gl_error("\n*** Error: getline(): not interactive, use stdio.\n"); gl_char_init(); gl_init_done = 1; } static void gl_cleanup() /* undo effects of gl_init, as necessary */ { if (gl_init_done > 0) gl_char_cleanup(); gl_init_done = 0; } void gl_setwidth(w) int w; { if (w > 20) { gl_termw = w; gl_scroll = w / 3; } else { gl_error("\n*** Error: minimum screen width is 21\n"); } } char * gl_getline(prompt) char *prompt; { int c, loc, tmp; #ifdef __unix__ int sig; #endif gl_init(); gl_prompt = (prompt)? prompt : ""; gl_buf[0] = 0; if (gl_in_hook) gl_in_hook(gl_buf); gl_fixup(gl_prompt, -2, BUF_SIZE); while ((c = gl_getc()) >= 0) { gl_extent = 0; /* reset to full extent */ if (isprint(c)) { if (gl_search_mode) search_addchar(c); else gl_addchar(c); } else { if (gl_search_mode) { if (c == '\033' || c == '\016' || c == '\020') { search_term(); c = 0; /* ignore the character */ } else if (c == '\010' || c == '\177') { search_addchar(-1); /* unwind search string */ c = 0; } else if (c != '\022' && c != '\023') { search_term(); /* terminate and handle char */ } } switch (c) { case '\n': case '\r': /* newline */ gl_newline(); gl_cleanup(); return gl_buf; /*NOTREACHED*/ break; case '\001': gl_fixup(gl_prompt, -1, 0); /* ^A */ break; case '\002': gl_fixup(gl_prompt, -1, gl_pos-1); /* ^B */ break; case '\004': /* ^D */ if (gl_cnt == 0) { gl_buf[0] = 0; gl_cleanup(); gl_putc('\n'); return gl_buf; } else { gl_del(0); } break; case '\005': gl_fixup(gl_prompt, -1, gl_cnt); /* ^E */ break; case '\006': gl_fixup(gl_prompt, -1, gl_pos+1); /* ^F */ break; case '\010': case '\177': gl_del(-1); /* ^H and DEL */ break; case '\t': /* TAB */ if (gl_tab_hook) { tmp = gl_pos; loc = gl_tab_hook(gl_buf, gl_strlen(gl_prompt), &tmp); if (loc >= 0 || tmp != gl_pos) gl_fixup(gl_prompt, loc, tmp); } break; case '\013': gl_kill(gl_pos); /* ^K */ break; case '\014': gl_redraw(); /* ^L */ break; case '\016': /* ^N */ strcpy(gl_buf, hist_next()); if (gl_in_hook) gl_in_hook(gl_buf); gl_fixup(gl_prompt, 0, BUF_SIZE); break; case '\017': gl_overwrite = !gl_overwrite; /* ^O */ break; case '\020': /* ^P */ strcpy(gl_buf, hist_prev()); if (gl_in_hook) gl_in_hook(gl_buf); gl_fixup(gl_prompt, 0, BUF_SIZE); break; case '\022': search_back(1); /* ^R */ break; case '\023': search_forw(1); /* ^S */ break; case '\024': gl_transpose(); /* ^T */ break; case '\025': gl_kill(0); /* ^U */ break; case '\031': gl_yank(); /* ^Y */ break; case '\033': /* ansi arrow keys */ c = gl_getc(); if (c == '[') { switch(c = gl_getc()) { case 'A': /* up */ strcpy(gl_buf, hist_prev()); if (gl_in_hook) gl_in_hook(gl_buf); gl_fixup(gl_prompt, 0, BUF_SIZE); break; case 'B': /* down */ strcpy(gl_buf, hist_next()); if (gl_in_hook) gl_in_hook(gl_buf); gl_fixup(gl_prompt, 0, BUF_SIZE); break; case 'C': gl_fixup(gl_prompt, -1, gl_pos+1); /* right */ break; case 'D': gl_fixup(gl_prompt, -1, gl_pos-1); /* left */ break; default: gl_putc('\007'); /* who knows */ break; } } else if (c == 'f' || c == 'F') { gl_word(1); } else if (c == 'b' || c == 'B') { gl_word(-1); } else gl_putc('\007'); break; default: /* check for a terminal signal */ #ifdef __unix__ if (c > 0) { /* ignore 0 (reset above) */ sig = 0; #ifdef SIGINT if (c == gl_intrc) sig = SIGINT; #endif #ifdef SIGQUIT if (c == gl_quitc) sig = SIGQUIT; #endif #ifdef SIGTSTP if (c == gl_suspc || c == gl_dsuspc) sig = SIGTSTP; #endif if (sig != 0) { gl_cleanup(); kill(0, sig); gl_init(); gl_redraw(); c = 0; } } #endif /* __unix__ */ if (c > 0) gl_putc('\007'); break; } } } gl_cleanup(); gl_buf[0] = 0; return gl_buf; } static void gl_addchar(c) int c; /* adds the character c to the input buffer at current location */ { int i; if (gl_cnt >= BUF_SIZE - 1) gl_error("\n*** Error: getline(): input buffer overflow\n"); if (gl_overwrite == 0 || gl_pos == gl_cnt) { for (i=gl_cnt; i >= gl_pos; i--) gl_buf[i+1] = gl_buf[i]; gl_buf[gl_pos] = c; gl_fixup(gl_prompt, gl_pos, gl_pos+1); } else { gl_buf[gl_pos] = c; gl_extent = 1; gl_fixup(gl_prompt, gl_pos, gl_pos+1); } } static void gl_yank() /* adds the kill buffer to the input buffer at current location */ { int i, len; len = strlen(gl_killbuf); if (len > 0) { if (gl_overwrite == 0) { if (gl_cnt + len >= BUF_SIZE - 1) gl_error("\n*** Error: getline(): input buffer overflow\n"); for (i=gl_cnt; i >= gl_pos; i--) gl_buf[i+len] = gl_buf[i]; for (i=0; i < len; i++) gl_buf[gl_pos+i] = gl_killbuf[i]; gl_fixup(gl_prompt, gl_pos, gl_pos+len); } else { if (gl_pos + len > gl_cnt) { if (gl_pos + len >= BUF_SIZE - 1) gl_error("\n*** Error: getline(): input buffer overflow\n"); gl_buf[gl_pos + len] = 0; } for (i=0; i < len; i++) gl_buf[gl_pos+i] = gl_killbuf[i]; gl_extent = len; gl_fixup(gl_prompt, gl_pos, gl_pos+len); } } else gl_putc('\007'); } static void gl_transpose() /* switch character under cursor and to left of cursor */ { int c; if (gl_pos > 0 && gl_cnt > gl_pos) { c = gl_buf[gl_pos-1]; gl_buf[gl_pos-1] = gl_buf[gl_pos]; gl_buf[gl_pos] = c; gl_extent = 2; gl_fixup(gl_prompt, gl_pos-1, gl_pos); } else gl_putc('\007'); } static void gl_newline() /* * Cleans up entire line before returning to caller. A \n is appended. * If line longer than screen, we redraw starting at beginning */ { int change = gl_cnt; int len = gl_cnt; int loc = gl_width - 5; /* shifts line back to start position */ if (gl_cnt >= BUF_SIZE - 1) gl_error("\n*** Error: getline(): input buffer overflow\n"); if (gl_out_hook) { change = gl_out_hook(gl_buf); len = strlen(gl_buf); } if (loc > len) loc = len; gl_fixup(gl_prompt, change, loc); /* must do this before appending \n */ gl_buf[len] = '\n'; gl_buf[len+1] = '\0'; gl_putc('\n'); } static void gl_del(loc) int loc; /* * Delete a character. The loc variable can be: * -1 : delete character to left of cursor * 0 : delete character under cursor */ { int i; if ((loc == -1 && gl_pos > 0) || (loc == 0 && gl_pos < gl_cnt)) { for (i=gl_pos+loc; i < gl_cnt; i++) gl_buf[i] = gl_buf[i+1]; gl_fixup(gl_prompt, gl_pos+loc, gl_pos+loc); } else gl_putc('\007'); } static void gl_kill(pos) int pos; /* delete from pos to the end of line */ { if (pos < gl_cnt) { strcpy(gl_killbuf, gl_buf + pos); gl_buf[pos] = '\0'; gl_fixup(gl_prompt, pos, pos); } else gl_putc('\007'); } static void gl_word(direction) int direction; /* move forward or backword one word */ { int pos = gl_pos; if (direction > 0) { /* forward */ while (!isspace(gl_buf[pos]) && pos < gl_cnt) pos++; while (isspace(gl_buf[pos]) && pos < gl_cnt) pos++; } else { /* backword */ if (pos > 0) pos--; while (isspace(gl_buf[pos]) && pos > 0) pos--; while (!isspace(gl_buf[pos]) && pos > 0) pos--; if (pos < gl_cnt && isspace(gl_buf[pos])) /* move onto word */ pos++; } gl_fixup(gl_prompt, -1, pos); } static void gl_redraw() /* emit a newline, reset and redraw prompt and current input line */ { if (gl_init_done > 0) { gl_putc('\n'); gl_fixup(gl_prompt, -2, gl_pos); } } static void gl_fixup(prompt, change, cursor) char *prompt; int change, cursor; /* * This function is used both for redrawing when input changes or for * moving within the input line. The parameters are: * prompt: compared to last_prompt[] for changes; * change : the index of the start of changes in the input buffer, * with -1 indicating no changes, -2 indicating we're on * a new line, redraw everything. * cursor : the desired location of the cursor after the call. * A value of BUF_SIZE can be used to indicate the cursor should * move just past the end of the input line. */ { static int gl_shift; /* index of first on screen character */ static int off_right; /* true if more text right of screen */ static int off_left; /* true if more text left of screen */ static char last_prompt[80] = ""; int left = 0, right = -1; /* bounds for redraw */ int pad; /* how much to erase at end of line */ int backup; /* how far to backup before fixing */ int new_shift; /* value of shift based on cursor */ int extra; /* adjusts when shift (scroll) happens */ int i; int new_right = -1; /* alternate right bound, using gl_extent */ int l1, l2; if (change == -2) { /* reset */ gl_pos = gl_cnt = gl_shift = off_right = off_left = 0; gl_putc('\r'); gl_puts(prompt); strcpy(last_prompt, prompt); change = 0; gl_width = gl_termw - gl_strlen(prompt); } else if (strcmp(prompt, last_prompt) != 0) { l1 = gl_strlen(last_prompt); l2 = gl_strlen(prompt); gl_cnt = gl_cnt + l1 - l2; strcpy(last_prompt, prompt); gl_putc('\r'); gl_puts(prompt); gl_pos = gl_shift; gl_width = gl_termw - l2; change = 0; } pad = (off_right)? gl_width - 1 : gl_cnt - gl_shift; /* old length */ backup = gl_pos - gl_shift; if (change >= 0) { gl_cnt = strlen(gl_buf); if (change > gl_cnt) change = gl_cnt; } if (cursor > gl_cnt) { if (cursor != BUF_SIZE) /* BUF_SIZE means end of line */ gl_putc('\007'); cursor = gl_cnt; } if (cursor < 0) { gl_putc('\007'); cursor = 0; } if (off_right || (off_left && cursor < gl_shift + gl_width - gl_scroll / 2)) extra = 2; /* shift the scrolling boundary */ else extra = 0; new_shift = cursor + extra + gl_scroll - gl_width; if (new_shift > 0) { new_shift /= gl_scroll; new_shift *= gl_scroll; } else new_shift = 0; if (new_shift != gl_shift) { /* scroll occurs */ gl_shift = new_shift; off_left = (gl_shift)? 1 : 0; off_right = (gl_cnt > gl_shift + gl_width - 1)? 1 : 0; left = gl_shift; new_right = right = (off_right)? gl_shift + gl_width - 2 : gl_cnt; } else if (change >= 0) { /* no scroll, but text changed */ if (change < gl_shift + off_left) { left = gl_shift; } else { left = change; backup = gl_pos - change; } off_right = (gl_cnt > gl_shift + gl_width - 1)? 1 : 0; right = (off_right)? gl_shift + gl_width - 2 : gl_cnt; new_right = (gl_extent && (right > left + gl_extent))? left + gl_extent : right; } pad -= (off_right)? gl_width - 1 : gl_cnt - gl_shift; pad = (pad < 0)? 0 : pad; if (left <= right) { /* clean up screen */ for (i=0; i < backup; i++) gl_putc('\b'); if (left == gl_shift && off_left) { gl_putc('$'); left++; } for (i=left; i < new_right; i++) gl_putc(gl_buf[i]); gl_pos = new_right; if (off_right && new_right == right) { gl_putc('$'); gl_pos++; } else { for (i=0; i < pad; i++) /* erase remains of prev line */ gl_putc(' '); gl_pos += pad; } } i = gl_pos - cursor; /* move to final cursor location */ if (i > 0) { while (i--) gl_putc('\b'); } else { for (i=gl_pos; i < cursor; i++) gl_putc(gl_buf[i]); } gl_pos = cursor; } static int gl_tab(buf, offset, loc) char *buf; int offset; int *loc; /* default tab handler, acts like tabstops every 8 cols */ { int i, count, len; len = strlen(buf); count = 8 - (offset + *loc) % 8; for (i=len; i >= *loc; i--) buf[i+count] = buf[i]; for (i=0; i < count; i++) buf[*loc+i] = ' '; i = *loc; *loc = i + count; return i; } /******************* strlen stuff **************************************/ void gl_strwidth(func) size_t (*func)(); { if (func != 0) { gl_strlen = func; } } /******************* History stuff **************************************/ #ifndef HIST_SIZE #define HIST_SIZE 100 #endif static int hist_pos = 0, hist_last = 0; static char *hist_buf[HIST_SIZE]; static void hist_init() { int i; hist_buf[0] = ""; for (i=1; i < HIST_SIZE; i++) hist_buf[i] = (char *)0; } void gl_histadd(buf) char *buf; { static char *prev = 0; char *p = buf; int len; /* in case we call gl_histadd() before we call gl_getline() */ if (gl_init_done < 0) { /* -1 only on startup */ hist_init(); gl_init_done = 0; } while (*p == ' ' || *p == '\t' || *p == '\n') p++; if (*p) { len = strlen(buf); if (strchr(p, '\n')) /* previously line already has NL stripped */ len--; if (prev == 0 || strlen(prev) != len || strncmp(prev, buf, len) != 0) { hist_buf[hist_last] = hist_save(buf); prev = hist_buf[hist_last]; hist_last = (hist_last + 1) % HIST_SIZE; if (hist_buf[hist_last] && *hist_buf[hist_last]) { free(hist_buf[hist_last]); } hist_buf[hist_last] = ""; } } hist_pos = hist_last; } static char * hist_prev() /* loads previous hist entry into input buffer, sticks on first */ { char *p = 0; int next = (hist_pos - 1 + HIST_SIZE) % HIST_SIZE; if (hist_buf[hist_pos] != 0 && next != hist_last) { hist_pos = next; p = hist_buf[hist_pos]; } if (p == 0) { p = ""; gl_putc('\007'); } return p; } static char * hist_next() /* loads next hist entry into input buffer, clears on last */ { char *p = 0; if (hist_pos != hist_last) { hist_pos = (hist_pos+1) % HIST_SIZE; p = hist_buf[hist_pos]; } if (p == 0) { p = ""; gl_putc('\007'); } return p; } static char * hist_save(p) char *p; /* makes a copy of the string */ { char *s = 0; int len = strlen(p); char *nl = strchr(p, '\n'); if (nl) { if ((s = malloc(len)) != 0) { strncpy(s, p, len-1); s[len-1] = 0; } } else { if ((s = malloc(len+1)) != 0) { strcpy(s, p); } } if (s == 0) gl_error("\n*** Error: hist_save() failed on malloc\n"); return s; } /******************* Search stuff **************************************/ static char search_prompt[101]; /* prompt includes search string */ static char search_string[100]; static int search_pos = 0; /* current location in search_string */ static int search_forw_flg = 0; /* search direction flag */ static int search_last = 0; /* last match found */ static void search_update(c) int c; { if (c == 0) { search_pos = 0; search_string[0] = 0; search_prompt[0] = '?'; search_prompt[1] = ' '; search_prompt[2] = 0; } else if (c > 0) { search_string[search_pos] = c; search_string[search_pos+1] = 0; search_prompt[search_pos] = c; search_prompt[search_pos+1] = '?'; search_prompt[search_pos+2] = ' '; search_prompt[search_pos+3] = 0; search_pos++; } else { if (search_pos > 0) { search_pos--; search_string[search_pos] = 0; search_prompt[search_pos] = '?'; search_prompt[search_pos+1] = ' '; search_prompt[search_pos+2] = 0; } else { gl_putc('\007'); hist_pos = hist_last; } } } static void search_addchar(c) int c; { char *loc; search_update(c); if (c < 0) { if (search_pos > 0) { hist_pos = search_last; } else { gl_buf[0] = 0; hist_pos = hist_last; } strcpy(gl_buf, hist_buf[hist_pos]); } if ((loc = strstr(gl_buf, search_string)) != 0) { gl_fixup(search_prompt, 0, loc - gl_buf); } else if (search_pos > 0) { if (search_forw_flg) { search_forw(0); } else { search_back(0); } } else { gl_fixup(search_prompt, 0, 0); } } static void search_term() { gl_search_mode = 0; if (gl_buf[0] == 0) /* not found, reset hist list */ hist_pos = hist_last; if (gl_in_hook) gl_in_hook(gl_buf); gl_fixup(gl_prompt, 0, gl_pos); } static void search_back(new_search) int new_search; { int found = 0; char *p, *loc; search_forw_flg = 0; if (gl_search_mode == 0) { search_last = hist_pos = hist_last; search_update(0); gl_search_mode = 1; gl_buf[0] = 0; gl_fixup(search_prompt, 0, 0); } else if (search_pos > 0) { while (!found) { p = hist_prev(); if (*p == 0) { /* not found, done looking */ gl_buf[0] = 0; gl_fixup(search_prompt, 0, 0); found = 1; } else if ((loc = strstr(p, search_string)) != 0) { strcpy(gl_buf, p); gl_fixup(search_prompt, 0, loc - p); if (new_search) search_last = hist_pos; found = 1; } } } else { gl_putc('\007'); } } static void search_forw(new_search) int new_search; { int found = 0; char *p, *loc; search_forw_flg = 1; if (gl_search_mode == 0) { search_last = hist_pos = hist_last; search_update(0); gl_search_mode = 1; gl_buf[0] = 0; gl_fixup(search_prompt, 0, 0); } else if (search_pos > 0) { while (!found) { p = hist_next(); if (*p == 0) { /* not found, done looking */ gl_buf[0] = 0; gl_fixup(search_prompt, 0, 0); found = 1; } else if ((loc = strstr(p, search_string)) != 0) { strcpy(gl_buf, p); gl_fixup(search_prompt, 0, loc - p); if (new_search) search_last = hist_pos; found = 1; } } } else { gl_putc('\007'); } }
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