string/argz-create.c

   1 /* Routines for dealing with '\0' separated arg vectors.
   2    Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Miles Bader <miles@gnu.ai.mit.edu>
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <argz.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 /* Make a '\0' separated arg vector from a unix argv vector, returning it in
  26    ARGZ, and the total length in LEN.  If a memory allocation error occurs,
  27    ENOMEM is returned, otherwise 0.  */
  28 error_t
  29 __argz_create (char *const argv[], char **argz, size_t *len)
  30 {
  31   int argc;
  32   size_t tlen = 0;
  33   char *const *ap;
  34   char *p;
  35
  36   for (argc = 0; argv[argc] != NULL; ++argc)
  37     tlen += strlen (argv[argc]) + 1;
  38
  39   if (tlen == 0)
  40     *argz = NULL;
  41   else
  42     {
  43       *argz = malloc (tlen);
  44       if (*argz == NULL)
  45         return ENOMEM;
  46
  47       for (p = *argz, ap = argv; *ap; ++ap, ++p)
  48         p = __stpcpy (p, *ap);
  49     }
  50   *len = tlen;
  51
  52   return 0;
  53 }
  54 weak_alias (__argz_create, argz_create)