string/argz-addsep.c

   1 /* Copyright (C) 1996-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <argz.h>
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23
  24 error_t
  25 __argz_add_sep (char **argz, size_t *argz_len, const char *string, int delim)
  26 {
  27   size_t nlen = strlen (string) + 1;
  28
  29   if (nlen > 1)
  30     {
  31       const char *rp;
  32       char *wp;
  33
  34       *argz = (char *) realloc (*argz, *argz_len + nlen);
  35       if (*argz == NULL)
  36         return ENOMEM;
  37
  38       wp = *argz + *argz_len;
  39       rp = string;
  40       do
  41         if (*rp == delim)
  42           {
  43             if (wp > *argz && wp[-1] != '\0')
  44               *wp++ = '\0';
  45             else
  46               --nlen;
  47           }
  48         else
  49           *wp++ = *rp;
  50       while (*rp++ != '\0');
  51
  52       *argz_len += nlen;
  53     }
  54
  55   return 0;
  56 }
  57 weak_alias (__argz_add_sep, argz_add_sep)