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/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static char sccsid[] = "@(#)util.c 8.74 (Berkeley) 8/17/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "compat.h"
#include <curses.h>
#include <db.h>
#include <regex.h>
#include "vi.h"
/*
* binc --
* Increase the size of a buffer.
*/
void *
binc(sp, bp, bsizep, min)
SCR *sp; /* sp MAY BE NULL!!! */
void *bp;
size_t *bsizep, min;
{
size_t csize;
/* If already larger than the minimum, just return. */
if (min && *bsizep >= min)
return (bp);
csize = *bsizep + MAX(min, 256);
REALLOC(sp, bp, void *, csize);
if (bp == NULL) {
/*
* Theoretically, realloc is supposed to leave any already
* held memory alone if it can't get more. Don't trust it.
*/
*bsizep = 0;
return (NULL);
}
/*
* Memory is guaranteed to be zero-filled, various parts of
* nvi depend on this.
*/
memset((char *)bp + *bsizep, 0, csize - *bsizep);
*bsizep = csize;
return (bp);
}
/*
* nonblank --
* Set the column number of the first non-blank character
* including or after the starting column. On error, set
* the column to 0, it's safest.
*/
int
nonblank(sp, ep, lno, cnop)
SCR *sp;
EXF *ep;
recno_t lno;
size_t *cnop;
{
char *p;
size_t cnt, len, off;
/* Default. */
off = *cnop;
*cnop = 0;
/* Get the line. */
if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
if (file_lline(sp, ep, &lno))
return (1);
if (lno == 0)
return (0);
GETLINE_ERR(sp, lno);
return (1);
}
/* Set the offset. */
if (len == 0 || off >= len)
return (0);
for (cnt = off, p = &p[off],
len -= off; len && isblank(*p); ++cnt, ++p, --len);
/* Set the return. */
*cnop = len ? cnt : cnt - 1;
return (0);
}
/*
* tail --
* Return tail of a path.
*/
char *
tail(path)
char *path;
{
char *p;
if ((p = strrchr(path, '/')) == NULL)
return (path);
return (p + 1);
}
/*
* set_alt_name --
* Set the alternate file name.
*
* Swap the alternate file name. It's a routine because I wanted some place
* to hang this comment. The alternate file name (normally referenced using
* the special character '#' during file expansion) is set by many
* operations. In the historic vi, the commands "ex", and "edit" obviously
* set the alternate file name because they switched the underlying file.
* Less obviously, the "read", "file", "write" and "wq" commands set it as
* well. In this implementation, some new commands have been added to the
* list. Where it gets interesting is that the alternate file name is set
* multiple times by some commands. If an edit attempt fails (for whatever
* reason, like the current file is modified but as yet unwritten), it is
* set to the file name that the user was unable to edit. If the edit
* succeeds, it is set to the last file name that was edited. Good fun.
*
* If the user edits a temporary file, there are time when there isn't an
* alternative file name. A name argument of NULL turns it off.
*/
void
set_alt_name(sp, name)
SCR *sp;
char *name;
{
if (sp->alt_name != NULL)
free(sp->alt_name);
if (name == NULL)
sp->alt_name = NULL;
else if ((sp->alt_name = strdup(name)) == NULL)
msgq(sp, M_SYSERR, NULL);
}
/*
* v_strdup --
* Strdup for wide character strings with an associated length.
*/
CHAR_T *
v_strdup(sp, str, len)
SCR *sp;
CHAR_T *str;
size_t len;
{
CHAR_T *copy;
MALLOC(sp, copy, CHAR_T *, len + 1);
if (copy == NULL)
return (NULL);
memmove(copy, str, len * sizeof(CHAR_T));
copy[len] = '\0';
return (copy);
}
/*
* vi_putchar --
* Functional version of putchar, for tputs.
*/
void
vi_putchar(ch)
int ch;
{
(void)putchar(ch);
}
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