string/argz-create.c

   1 /* Routines for dealing with '\0' separated arg vectors.
   2    Copyright (C) 1995-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <argz.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 /* Make a '\0' separated arg vector from a unix argv vector, returning it in
  24    ARGZ, and the total length in LEN.  If a memory allocation error occurs,
  25    ENOMEM is returned, otherwise 0.  */
  26 error_t
  27 __argz_create (char *const argv[], char **argz, size_t *len)
  28 {
  29   int argc;
  30   size_t tlen = 0;
  31   char *const *ap;
  32   char *p;
  33
  34   for (argc = 0; argv[argc] != NULL; ++argc)
  35     tlen += strlen (argv[argc]) + 1;
  36
  37   if (tlen == 0)
  38     *argz = NULL;
  39   else
  40     {
  41       *argz = malloc (tlen);
  42       if (*argz == NULL)
  43         return ENOMEM;
  44
  45       for (p = *argz, ap = argv; *ap; ++ap, ++p)
  46         p = __stpcpy (p, *ap);
  47     }
  48   *len = tlen;
  49
  50   return 0;
  51 }
  52 weak_alias (__argz_create, argz_create)