#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>
#include <stdlib.h>
/********************* exported interface ********************************/
char *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(void); /* prepare to edit a line */
static void gl_cleanup(void); /* to undo gl_init */
static void gl_char_init(void); /* get ready for no echo input */
static void gl_char_cleanup(void); /* undo gl_char_init */
static size_t (*gl_strlen)() = (size_t(*)())strlen;
/* returns printable prompt width */
static void gl_addchar(int c); /* install specified char */
static void gl_del(int loc); /* del, either left (-1) or cur (0) */
static void gl_error(char *buf); /* write error msg and die */
static void gl_fixup(char*,int,int);/* fixup state variables and screen */
static int gl_getc(void); /* read one char from terminal */
static void gl_kill(int pos); /* delete to EOL */
static void gl_newline(void); /* handle \n or \r */
static void gl_putc(int c); /* write one char to terminal */
static void gl_puts(char *buf); /* write a line to terminal */
static void gl_redraw(void); /* issue \n and redraw all */
static void gl_transpose(void); /* transpose two chars */
static void gl_yank(void); /* yank killed text */
static void gl_word(int dir); /* move a word */
static void hist_init(void); /* initializes hist pointers */
static char *hist_next(void); /* return ptr to next item */
static char *hist_prev(void); /* return ptr to prev item */
static char *hist_save(char *p); /* makes copy of a string, without NL */
static void search_addchar(int c); /* increment search string */
static void search_term(void); /* reset with current contents */
static void search_back(int new); /* look back for current string */
static void search_forw(int new); /* look forw for current string */
/************************ nonportable part *********************************/
#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__
#include <unistd.h>
#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 *
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 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(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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