/*

 * 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);

}