1  /* Routines for dealing with '\0' separated arg vectors.
       2     Copyright (C) 1995-2023 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)