NetBSD/lib/libedit/chared.c

754 lines
17 KiB
C

/* $NetBSD: chared.c,v 1.57 2017/10/11 06:49:03 abhinav Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Christos Zoulas of Cornell University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#if !defined(lint) && !defined(SCCSID)
#if 0
static char sccsid[] = "@(#)chared.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: chared.c,v 1.57 2017/10/11 06:49:03 abhinav Exp $");
#endif
#endif /* not lint && not SCCSID */
/*
* chared.c: Character editor utilities
*/
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "el.h"
#include "common.h"
#include "fcns.h"
/* value to leave unused in line buffer */
#define EL_LEAVE 2
/* cv_undo():
* Handle state for the vi undo command
*/
libedit_private void
cv_undo(EditLine *el)
{
c_undo_t *vu = &el->el_chared.c_undo;
c_redo_t *r = &el->el_chared.c_redo;
size_t size;
/* Save entire line for undo */
size = (size_t)(el->el_line.lastchar - el->el_line.buffer);
vu->len = (ssize_t)size;
vu->cursor = (int)(el->el_line.cursor - el->el_line.buffer);
(void)memcpy(vu->buf, el->el_line.buffer, size * sizeof(*vu->buf));
/* save command info for redo */
r->count = el->el_state.doingarg ? el->el_state.argument : 0;
r->action = el->el_chared.c_vcmd.action;
r->pos = r->buf;
r->cmd = el->el_state.thiscmd;
r->ch = el->el_state.thisch;
}
/* cv_yank():
* Save yank/delete data for paste
*/
libedit_private void
cv_yank(EditLine *el, const wchar_t *ptr, int size)
{
c_kill_t *k = &el->el_chared.c_kill;
(void)memcpy(k->buf, ptr, (size_t)size * sizeof(*k->buf));
k->last = k->buf + size;
}
/* c_insert():
* Insert num characters
*/
libedit_private void
c_insert(EditLine *el, int num)
{
wchar_t *cp;
if (el->el_line.lastchar + num >= el->el_line.limit) {
if (!ch_enlargebufs(el, (size_t)num))
return; /* can't go past end of buffer */
}
if (el->el_line.cursor < el->el_line.lastchar) {
/* if I must move chars */
for (cp = el->el_line.lastchar; cp >= el->el_line.cursor; cp--)
cp[num] = *cp;
}
el->el_line.lastchar += num;
}
/* c_delafter():
* Delete num characters after the cursor
*/
libedit_private void
c_delafter(EditLine *el, int num)
{
if (el->el_line.cursor + num > el->el_line.lastchar)
num = (int)(el->el_line.lastchar - el->el_line.cursor);
if (el->el_map.current != el->el_map.emacs) {
cv_undo(el);
cv_yank(el, el->el_line.cursor, num);
}
if (num > 0) {
wchar_t *cp;
for (cp = el->el_line.cursor; cp <= el->el_line.lastchar; cp++)
*cp = cp[num];
el->el_line.lastchar -= num;
}
}
/* c_delafter1():
* Delete the character after the cursor, do not yank
*/
libedit_private void
c_delafter1(EditLine *el)
{
wchar_t *cp;
for (cp = el->el_line.cursor; cp <= el->el_line.lastchar; cp++)
*cp = cp[1];
el->el_line.lastchar--;
}
/* c_delbefore():
* Delete num characters before the cursor
*/
libedit_private void
c_delbefore(EditLine *el, int num)
{
if (el->el_line.cursor - num < el->el_line.buffer)
num = (int)(el->el_line.cursor - el->el_line.buffer);
if (el->el_map.current != el->el_map.emacs) {
cv_undo(el);
cv_yank(el, el->el_line.cursor - num, num);
}
if (num > 0) {
wchar_t *cp;
for (cp = el->el_line.cursor - num;
cp <= el->el_line.lastchar;
cp++)
*cp = cp[num];
el->el_line.lastchar -= num;
}
}
/* c_delbefore1():
* Delete the character before the cursor, do not yank
*/
libedit_private void
c_delbefore1(EditLine *el)
{
wchar_t *cp;
for (cp = el->el_line.cursor - 1; cp <= el->el_line.lastchar; cp++)
*cp = cp[1];
el->el_line.lastchar--;
}
/* ce__isword():
* Return if p is part of a word according to emacs
*/
libedit_private int
ce__isword(wint_t p)
{
return iswalnum(p) || wcschr(L"*?_-.[]~=", p) != NULL;
}
/* cv__isword():
* Return if p is part of a word according to vi
*/
libedit_private int
cv__isword(wint_t p)
{
if (iswalnum(p) || p == L'_')
return 1;
if (iswgraph(p))
return 2;
return 0;
}
/* cv__isWord():
* Return if p is part of a big word according to vi
*/
libedit_private int
cv__isWord(wint_t p)
{
return !iswspace(p);
}
/* c__prev_word():
* Find the previous word
*/
libedit_private wchar_t *
c__prev_word(wchar_t *p, wchar_t *low, int n, int (*wtest)(wint_t))
{
p--;
while (n--) {
while ((p >= low) && !(*wtest)(*p))
p--;
while ((p >= low) && (*wtest)(*p))
p--;
}
/* cp now points to one character before the word */
p++;
if (p < low)
p = low;
/* cp now points where we want it */
return p;
}
/* c__next_word():
* Find the next word
*/
libedit_private wchar_t *
c__next_word(wchar_t *p, wchar_t *high, int n, int (*wtest)(wint_t))
{
while (n--) {
while ((p < high) && !(*wtest)(*p))
p++;
while ((p < high) && (*wtest)(*p))
p++;
}
if (p > high)
p = high;
/* p now points where we want it */
return p;
}
/* cv_next_word():
* Find the next word vi style
*/
libedit_private wchar_t *
cv_next_word(EditLine *el, wchar_t *p, wchar_t *high, int n,
int (*wtest)(wint_t))
{
int test;
while (n--) {
test = (*wtest)(*p);
while ((p < high) && (*wtest)(*p) == test)
p++;
/*
* vi historically deletes with cw only the word preserving the
* trailing whitespace! This is not what 'w' does..
*/
if (n || el->el_chared.c_vcmd.action != (DELETE|INSERT))
while ((p < high) && iswspace(*p))
p++;
}
/* p now points where we want it */
if (p > high)
return high;
else
return p;
}
/* cv_prev_word():
* Find the previous word vi style
*/
libedit_private wchar_t *
cv_prev_word(wchar_t *p, wchar_t *low, int n, int (*wtest)(wint_t))
{
int test;
p--;
while (n--) {
while ((p > low) && iswspace(*p))
p--;
test = (*wtest)(*p);
while ((p >= low) && (*wtest)(*p) == test)
p--;
}
p++;
/* p now points where we want it */
if (p < low)
return low;
else
return p;
}
/* cv_delfini():
* Finish vi delete action
*/
libedit_private void
cv_delfini(EditLine *el)
{
int size;
int action = el->el_chared.c_vcmd.action;
if (action & INSERT)
el->el_map.current = el->el_map.key;
if (el->el_chared.c_vcmd.pos == 0)
/* sanity */
return;
size = (int)(el->el_line.cursor - el->el_chared.c_vcmd.pos);
if (size == 0)
size = 1;
el->el_line.cursor = el->el_chared.c_vcmd.pos;
if (action & YANK) {
if (size > 0)
cv_yank(el, el->el_line.cursor, size);
else
cv_yank(el, el->el_line.cursor + size, -size);
} else {
if (size > 0) {
c_delafter(el, size);
re_refresh_cursor(el);
} else {
c_delbefore(el, -size);
el->el_line.cursor += size;
}
}
el->el_chared.c_vcmd.action = NOP;
}
/* cv__endword():
* Go to the end of this word according to vi
*/
libedit_private wchar_t *
cv__endword(wchar_t *p, wchar_t *high, int n, int (*wtest)(wint_t))
{
int test;
p++;
while (n--) {
while ((p < high) && iswspace(*p))
p++;
test = (*wtest)(*p);
while ((p < high) && (*wtest)(*p) == test)
p++;
}
p--;
return p;
}
/* ch_init():
* Initialize the character editor
*/
libedit_private int
ch_init(EditLine *el)
{
el->el_line.buffer = el_malloc(EL_BUFSIZ *
sizeof(*el->el_line.buffer));
if (el->el_line.buffer == NULL)
return -1;
(void) memset(el->el_line.buffer, 0, EL_BUFSIZ *
sizeof(*el->el_line.buffer));
el->el_line.cursor = el->el_line.buffer;
el->el_line.lastchar = el->el_line.buffer;
el->el_line.limit = &el->el_line.buffer[EL_BUFSIZ - EL_LEAVE];
el->el_chared.c_undo.buf = el_malloc(EL_BUFSIZ *
sizeof(*el->el_chared.c_undo.buf));
if (el->el_chared.c_undo.buf == NULL)
return -1;
(void) memset(el->el_chared.c_undo.buf, 0, EL_BUFSIZ *
sizeof(*el->el_chared.c_undo.buf));
el->el_chared.c_undo.len = -1;
el->el_chared.c_undo.cursor = 0;
el->el_chared.c_redo.buf = el_malloc(EL_BUFSIZ *
sizeof(*el->el_chared.c_redo.buf));
if (el->el_chared.c_redo.buf == NULL)
return -1;
el->el_chared.c_redo.pos = el->el_chared.c_redo.buf;
el->el_chared.c_redo.lim = el->el_chared.c_redo.buf + EL_BUFSIZ;
el->el_chared.c_redo.cmd = ED_UNASSIGNED;
el->el_chared.c_vcmd.action = NOP;
el->el_chared.c_vcmd.pos = el->el_line.buffer;
el->el_chared.c_kill.buf = el_malloc(EL_BUFSIZ *
sizeof(*el->el_chared.c_kill.buf));
if (el->el_chared.c_kill.buf == NULL)
return -1;
(void) memset(el->el_chared.c_kill.buf, 0, EL_BUFSIZ *
sizeof(*el->el_chared.c_kill.buf));
el->el_chared.c_kill.mark = el->el_line.buffer;
el->el_chared.c_kill.last = el->el_chared.c_kill.buf;
el->el_chared.c_resizefun = NULL;
el->el_chared.c_resizearg = NULL;
el->el_chared.c_aliasfun = NULL;
el->el_chared.c_aliasarg = NULL;
el->el_map.current = el->el_map.key;
el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */
el->el_state.doingarg = 0;
el->el_state.metanext = 0;
el->el_state.argument = 1;
el->el_state.lastcmd = ED_UNASSIGNED;
return 0;
}
/* ch_reset():
* Reset the character editor
*/
libedit_private void
ch_reset(EditLine *el)
{
el->el_line.cursor = el->el_line.buffer;
el->el_line.lastchar = el->el_line.buffer;
el->el_chared.c_undo.len = -1;
el->el_chared.c_undo.cursor = 0;
el->el_chared.c_vcmd.action = NOP;
el->el_chared.c_vcmd.pos = el->el_line.buffer;
el->el_chared.c_kill.mark = el->el_line.buffer;
el->el_map.current = el->el_map.key;
el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */
el->el_state.doingarg = 0;
el->el_state.metanext = 0;
el->el_state.argument = 1;
el->el_state.lastcmd = ED_UNASSIGNED;
el->el_history.eventno = 0;
}
/* ch_enlargebufs():
* Enlarge line buffer to be able to hold twice as much characters.
* Returns 1 if successful, 0 if not.
*/
libedit_private int
ch_enlargebufs(EditLine *el, size_t addlen)
{
size_t sz, newsz;
wchar_t *newbuffer, *oldbuf, *oldkbuf;
sz = (size_t)(el->el_line.limit - el->el_line.buffer + EL_LEAVE);
newsz = sz * 2;
/*
* If newly required length is longer than current buffer, we need
* to make the buffer big enough to hold both old and new stuff.
*/
if (addlen > sz) {
while(newsz - sz < addlen)
newsz *= 2;
}
/*
* Reallocate line buffer.
*/
newbuffer = el_realloc(el->el_line.buffer, newsz * sizeof(*newbuffer));
if (!newbuffer)
return 0;
/* zero the newly added memory, leave old data in */
(void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer));
oldbuf = el->el_line.buffer;
el->el_line.buffer = newbuffer;
el->el_line.cursor = newbuffer + (el->el_line.cursor - oldbuf);
el->el_line.lastchar = newbuffer + (el->el_line.lastchar - oldbuf);
/* don't set new size until all buffers are enlarged */
el->el_line.limit = &newbuffer[sz - EL_LEAVE];
/*
* Reallocate kill buffer.
*/
newbuffer = el_realloc(el->el_chared.c_kill.buf, newsz *
sizeof(*newbuffer));
if (!newbuffer)
return 0;
/* zero the newly added memory, leave old data in */
(void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer));
oldkbuf = el->el_chared.c_kill.buf;
el->el_chared.c_kill.buf = newbuffer;
el->el_chared.c_kill.last = newbuffer +
(el->el_chared.c_kill.last - oldkbuf);
el->el_chared.c_kill.mark = el->el_line.buffer +
(el->el_chared.c_kill.mark - oldbuf);
/*
* Reallocate undo buffer.
*/
newbuffer = el_realloc(el->el_chared.c_undo.buf,
newsz * sizeof(*newbuffer));
if (!newbuffer)
return 0;
/* zero the newly added memory, leave old data in */
(void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer));
el->el_chared.c_undo.buf = newbuffer;
newbuffer = el_realloc(el->el_chared.c_redo.buf,
newsz * sizeof(*newbuffer));
if (!newbuffer)
return 0;
el->el_chared.c_redo.pos = newbuffer +
(el->el_chared.c_redo.pos - el->el_chared.c_redo.buf);
el->el_chared.c_redo.lim = newbuffer +
(el->el_chared.c_redo.lim - el->el_chared.c_redo.buf);
el->el_chared.c_redo.buf = newbuffer;
if (!hist_enlargebuf(el, sz, newsz))
return 0;
/* Safe to set enlarged buffer size */
el->el_line.limit = &el->el_line.buffer[newsz - EL_LEAVE];
if (el->el_chared.c_resizefun)
(*el->el_chared.c_resizefun)(el, el->el_chared.c_resizearg);
return 1;
}
/* ch_end():
* Free the data structures used by the editor
*/
libedit_private void
ch_end(EditLine *el)
{
el_free(el->el_line.buffer);
el->el_line.buffer = NULL;
el->el_line.limit = NULL;
el_free(el->el_chared.c_undo.buf);
el->el_chared.c_undo.buf = NULL;
el_free(el->el_chared.c_redo.buf);
el->el_chared.c_redo.buf = NULL;
el->el_chared.c_redo.pos = NULL;
el->el_chared.c_redo.lim = NULL;
el->el_chared.c_redo.cmd = ED_UNASSIGNED;
el_free(el->el_chared.c_kill.buf);
el->el_chared.c_kill.buf = NULL;
ch_reset(el);
}
/* el_insertstr():
* Insert string at cursor
*/
int
el_winsertstr(EditLine *el, const wchar_t *s)
{
size_t len;
if (s == NULL || (len = wcslen(s)) == 0)
return -1;
if (el->el_line.lastchar + len >= el->el_line.limit) {
if (!ch_enlargebufs(el, len))
return -1;
}
c_insert(el, (int)len);
while (*s)
*el->el_line.cursor++ = *s++;
return 0;
}
/* el_deletestr():
* Delete num characters before the cursor
*/
void
el_deletestr(EditLine *el, int n)
{
if (n <= 0)
return;
if (el->el_line.cursor < &el->el_line.buffer[n])
return;
c_delbefore(el, n); /* delete before dot */
el->el_line.cursor -= n;
if (el->el_line.cursor < el->el_line.buffer)
el->el_line.cursor = el->el_line.buffer;
}
/* el_cursor():
* Move the cursor to the left or the right of the current position
*/
int
el_cursor(EditLine *el, int n)
{
if (n == 0)
goto out;
el->el_line.cursor += n;
if (el->el_line.cursor < el->el_line.buffer)
el->el_line.cursor = el->el_line.buffer;
if (el->el_line.cursor > el->el_line.lastchar)
el->el_line.cursor = el->el_line.lastchar;
out:
return (int)(el->el_line.cursor - el->el_line.buffer);
}
/* c_gets():
* Get a string
*/
libedit_private int
c_gets(EditLine *el, wchar_t *buf, const wchar_t *prompt)
{
ssize_t len;
wchar_t *cp = el->el_line.buffer, ch;
if (prompt) {
len = (ssize_t)wcslen(prompt);
(void)memcpy(cp, prompt, (size_t)len * sizeof(*cp));
cp += len;
}
len = 0;
for (;;) {
el->el_line.cursor = cp;
*cp = ' ';
el->el_line.lastchar = cp + 1;
re_refresh(el);
if (el_wgetc(el, &ch) != 1) {
ed_end_of_file(el, 0);
len = -1;
break;
}
switch (ch) {
case L'\b': /* Delete and backspace */
case 0177:
if (len == 0) {
len = -1;
break;
}
len--;
cp--;
continue;
case 0033: /* ESC */
case L'\r': /* Newline */
case L'\n':
buf[len] = ch;
break;
default:
if (len >= (ssize_t)(EL_BUFSIZ - 16))
terminal_beep(el);
else {
buf[len++] = ch;
*cp++ = ch;
}
continue;
}
break;
}
el->el_line.buffer[0] = '\0';
el->el_line.lastchar = el->el_line.buffer;
el->el_line.cursor = el->el_line.buffer;
return (int)len;
}
/* c_hpos():
* Return the current horizontal position of the cursor
*/
libedit_private int
c_hpos(EditLine *el)
{
wchar_t *ptr;
/*
* Find how many characters till the beginning of this line.
*/
if (el->el_line.cursor == el->el_line.buffer)
return 0;
else {
for (ptr = el->el_line.cursor - 1;
ptr >= el->el_line.buffer && *ptr != '\n';
ptr--)
continue;
return (int)(el->el_line.cursor - ptr - 1);
}
}
libedit_private int
ch_resizefun(EditLine *el, el_zfunc_t f, void *a)
{
el->el_chared.c_resizefun = f;
el->el_chared.c_resizearg = a;
return 0;
}
libedit_private int
ch_aliasfun(EditLine *el, el_afunc_t f, void *a)
{
el->el_chared.c_aliasfun = f;
el->el_chared.c_aliasarg = a;
return 0;
}