mirror of https://github.com/sudo-project/sudo.git
131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2007, 2013-2016 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_STDBOOL_H
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# include <stdbool.h>
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#else
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# include <compat/stdbool.h>
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#endif
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#include <sudo_compat.h>
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#include <sudo_util.h>
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#include <sudo_debug.h>
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/*
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* Read a line of input, honoring line continuation chars.
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* Remove comments and strip off leading and trailing spaces.
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* Returns the line length and updates the buf and bufsize pointers.
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* XXX - just use a struct w/ state, including getdelim buffer?
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* could also make comment char and line continuation configurable
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*/
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ssize_t
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sudo_parseln_v2(char **bufp, size_t *bufsizep, unsigned int *lineno, FILE *fp, int flags)
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{
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ssize_t len, total = 0;
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size_t bufsize, linesize = 0;
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char *cp, *line = NULL;
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bool continued, comment;
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debug_decl(sudo_parseln, SUDO_DEBUG_UTIL);
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do {
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comment = false;
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continued = false;
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len = getdelim(&line, &linesize, '\n', fp);
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if (len == -1)
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break;
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if (lineno != NULL)
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(*lineno)++;
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/* Remove trailing newline(s) if present. */
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while (len > 0 && (line[len - 1] == '\n' || line[len - 1] == '\r'))
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line[--len] = '\0';
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/* Remove comments or check for line continuation (but not both) */
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if ((cp = strchr(line, '#')) != NULL) {
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if (cp == line || !ISSET(flags, PARSELN_COMM_BOL)) {
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*cp = '\0';
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len = (ssize_t)(cp - line);
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comment = true;
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}
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}
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if (!comment && !ISSET(flags, PARSELN_CONT_IGN)) {
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if (len > 0 && line[len - 1] == '\\' && (len == 1 || line[len - 2] != '\\')) {
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line[--len] = '\0';
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continued = true;
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}
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}
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/* Trim leading and trailing whitespace */
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if (!continued) {
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while (len > 0 && isblank((unsigned char)line[len - 1]))
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line[--len] = '\0';
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}
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for (cp = line; isblank((unsigned char)*cp); cp++)
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len--;
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bufsize = (size_t)(total + len + 1);
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if (*bufp == NULL || bufsize > *bufsizep) {
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const size_t newsize = sudo_pow2_roundup(bufsize);
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void *newbuf;
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if (newsize < bufsize) {
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/* overflow */
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errno = ENOMEM;
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
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"unable to allocate memory");
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len = -1;
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total = 0;
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break;
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}
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if ((newbuf = realloc(*bufp, newsize)) == NULL) {
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
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"unable to allocate memory");
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len = -1;
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total = 0;
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break;
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}
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*bufp = newbuf;
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*bufsizep = newsize;
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}
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memcpy(*bufp + total, cp, (size_t)(len + 1));
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total += len;
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} while (continued);
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free(line);
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if (len == -1 && total == 0)
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debug_return_ssize_t(-1);
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debug_return_ssize_t(total);
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}
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ssize_t
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sudo_parseln_v1(char **bufp, size_t *bufsizep, unsigned int *lineno, FILE *fp)
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{
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return sudo_parseln_v2(bufp, bufsizep, lineno, fp, 0);
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}
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