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glibc  2.9
argz-create.c
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00001 /* Routines for dealing with '\0' separated arg vectors.
00002    Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Written by Miles Bader <miles@gnu.ai.mit.edu>
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <argz.h>
00022 #include <stdlib.h>
00023 #include <string.h>
00024 
00025 /* Make a '\0' separated arg vector from a unix argv vector, returning it in
00026    ARGZ, and the total length in LEN.  If a memory allocation error occurs,
00027    ENOMEM is returned, otherwise 0.  */
00028 error_t
00029 __argz_create (char *const argv[], char **argz, size_t *len)
00030 {
00031   int argc;
00032   size_t tlen = 0;
00033   char *const *ap;
00034   char *p;
00035 
00036   for (argc = 0; argv[argc] != NULL; ++argc)
00037     tlen += strlen (argv[argc]) + 1;
00038 
00039   if (tlen == 0)
00040     *argz = NULL;
00041   else
00042     {
00043       *argz = malloc (tlen);
00044       if (*argz == NULL)
00045        return ENOMEM;
00046 
00047       for (p = *argz, ap = argv; *ap; ++ap, ++p)
00048        p = __stpcpy (p, *ap);
00049     }
00050   *len = tlen;
00051 
00052   return 0;
00053 }
00054 weak_alias (__argz_create, argz_create)