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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2019-2020 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#ifndef HAVE_GETDELIM
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <sudo_compat.h>
ssize_t
sudo_getdelim(char ** restrict buf, size_t * restrict bufsize, int delim,
FILE * restrict fp)
{
char *cp, *ep;
int ch;
if (*buf == NULL || *bufsize == 0) {
char *tmp = realloc(*buf, LINE_MAX);
if (tmp == NULL)
return -1;
*buf = tmp;
*bufsize = LINE_MAX;
}
cp = *buf;
ep = cp + *bufsize;
do {
if (cp + 1 >= ep) {
char *newbuf = reallocarray(*buf, *bufsize, 2);
if (newbuf == NULL)
goto bad;
*bufsize *= 2;
cp = newbuf + (cp - *buf);
ep = newbuf + *bufsize;
*buf = newbuf;
}
if ((ch = getc(fp)) == EOF) {
if (feof(fp))
break;
goto bad;
}
*cp++ = ch;
} while (ch != delim);
/* getdelim(3) should never return a length of 0. */
if (cp != *buf) {
*cp = '\0';
return (ssize_t)(cp - *buf);
}
bad:
/* Error, push back what was read if possible. */
while (cp > *buf) {
if (ungetc(*cp--, fp) == EOF)
break;
}
return -1;
}
#endif /* HAVE_GETDELIM */
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