/*

 * 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 <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sudoers.h>

#ifdef HAVE_STRLCPY

# define cpy_default  strlcpy

#else

# define cpy_default  sudo_strlcpy

#endif

/*

 * Join a NULL-terminated array of strings using the specified separator

 * char.  If non-NULL, the copy function must have strlcpy-like semantics.

 */

char *

strvec_join(char *const argv[], char sep, size_t (*cpy)(char * restrict, const char * restrict, size_t))

{

    char *dst, *result = NULL;

    char *const *av;

    size_t n, size = 0;

    debug_decl(strvec_join, SUDOERS_DEBUG_UTIL);

    for (av = argv; *av != NULL; av++)

  size += strlen(*av) + 1;

    if (size == 0 || (result = malloc(size)) == NULL) {

  sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));

  debug_return_ptr(NULL);

    }

    if (cpy == NULL)

  cpy = cpy_default;

    for (dst = result, av = argv; *av != NULL; av++) {

  n = cpy(dst, *av, size);

  if (n >= size) {

      sudo_warnx(U_("internal error, %s overflow"), __func__);

      free(result);

      debug_return_ptr(NULL);

  }

  dst += n;

  size -= n;

  *dst++ = sep;

  size--;

    }

    dst[-1] = '\0';

    debug_return_str(result);

}