glibc/string/argz-create.c

/* Routines for dealing with '\0' separated arg vectors.

   Copyright (C) 1995, 1996 Free Software Foundation, Inc.

   Written by Miles Bader <miles@gnu.ai.mit.edu>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <argz.h>
#include <stdlib.h>
#include <string.h>

/* Make a '\0' separated arg vector from a unix argv vector, returning it in
   ARGZ, and the total length in LEN.  If a memory allocation error occurs,
   ENOMEM is returned, otherwise 0.  */
error_t
__argz_create (char *const argv[], char **argz, size_t *len)
{
  int argc;
  size_t tlen = 0;
  char *const *ap;
  char *p;

  for (argc = 0; argv[argc] != NULL; ++argc)
    tlen += strlen (argv[argc]) + 1;

  if (tlen == 0)
    *argz = NULL;
  else
    {
      *argz = malloc(tlen);
      if (*argz == NULL)
	return ENOMEM;

      for (p = *argz, ap = argv; *ap; ++ap, ++p)
	p = __stpcpy (p, *ap);
    }
  *len = tlen;

  return 0;
}
weak_alias (__argz_create, argz_create)