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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2007, 2013-2016 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>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include <compat/stdbool.h>
#endif
#include <sudo_compat.h>
#include <sudo_util.h>
#include <sudo_debug.h>
/*
* Read a line of input, honoring line continuation chars.
* Remove comments and strip off leading and trailing spaces.
* Returns the line length and updates the buf and bufsize pointers.
* XXX - just use a struct w/ state, including getdelim buffer?
* could also make comment char and line continuation configurable
*/
ssize_t
sudo_parseln_v2(char **bufp, size_t *bufsizep, unsigned int *lineno, FILE *fp, int flags)
{
ssize_t len, total = 0;
size_t bufsize, linesize = 0;
char *cp, *line = NULL;
bool continued, comment;
debug_decl(sudo_parseln, SUDO_DEBUG_UTIL);
do {
comment = false;
continued = false;
len = getdelim(&line, &linesize, '\n', fp);
if (len == -1)
break;
if (lineno != NULL)
(*lineno)++;
/* Remove trailing newline(s) if present. */
while (len > 0 && (line[len - 1] == '\n' || line[len - 1] == '\r'))
line[--len] = '\0';
/* Remove comments or check for line continuation (but not both) */
if ((cp = strchr(line, '#')) != NULL) {
if (cp == line || !ISSET(flags, PARSELN_COMM_BOL)) {
*cp = '\0';
len = (ssize_t)(cp - line);
comment = true;
}
}
if (!comment && !ISSET(flags, PARSELN_CONT_IGN)) {
if (len > 0 && line[len - 1] == '\\' && (len == 1 || line[len - 2] != '\\')) {
line[--len] = '\0';
continued = true;
}
}
/* Trim leading and trailing whitespace */
if (!continued) {
while (len > 0 && isblank((unsigned char)line[len - 1]))
line[--len] = '\0';
}
for (cp = line; isblank((unsigned char)*cp); cp++)
len--;
bufsize = (size_t)(total + len + 1);
if (*bufp == NULL || bufsize > *bufsizep) {
const size_t newsize = sudo_pow2_roundup(bufsize);
void *newbuf;
if (newsize < bufsize) {
/* overflow */
errno = ENOMEM;
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unable to allocate memory");
len = -1;
total = 0;
break;
}
if ((newbuf = realloc(*bufp, newsize)) == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unable to allocate memory");
len = -1;
total = 0;
break;
}
*bufp = newbuf;
*bufsizep = newsize;
}
memcpy(*bufp + total, cp, (size_t)(len + 1));
total += len;
} while (continued);
free(line);
if (len == -1 && total == 0)
debug_return_ssize_t(-1);
debug_return_ssize_t(total);
}
ssize_t
sudo_parseln_v1(char **bufp, size_t *bufsizep, unsigned int *lineno, FILE *fp)
{
return sudo_parseln_v2(bufp, bufsizep, lineno, fp, 0);
}
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