/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2021 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.

 */

#include <config.h>

#include <sys/types.h>

#include <stdio.h>

#include <ctype.h>

#include <sudoers.h>

/*

 * Like strlcpy() but collapses non-space chars escaped with a backslash.

 */

size_t

strlcpy_unescape(char *restrict dst, const char *restrict src, size_t size)

{

    size_t len = 0;

    char ch;

    debug_decl(strlcpy_unescape, SUDOERS_DEBUG_UTIL);

    while ((ch = *src++) != '\0') {

  if (ch == '\\' && *src != '\0' && !isspace((unsigned char)*src))

      ch = *src++;

  if (size > 1) {

      *dst++ = ch;

      size--;

  }

  len++;

    }

    if (size > 0)

  *dst = '\0';

    debug_return_size_t(len);

}