| /* Routines for dealing with '\0' separated arg vectors. |
| Copyright (C) 1995-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Written by Miles Bader <miles@gnu.ai.mit.edu> |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <argz.h> |
| #include <string.h> |
| #include <stdlib.h> |
| |
| /* Insert ENTRY into ARGZ & ARGZ_LEN before BEFORE, which should be an |
| existing entry in ARGZ; if BEFORE is NULL, ENTRY is appended to the end. |
| Since ARGZ's first entry is the same as ARGZ, argz_insert (ARGZ, ARGZ_LEN, |
| ARGZ, ENTRY) will insert ENTRY at the beginning of ARGZ. If BEFORE is not |
| in ARGZ, EINVAL is returned, else if memory can't be allocated for the new |
| ARGZ, ENOMEM is returned, else 0. */ |
| error_t |
| __argz_insert (char **argz, size_t *argz_len, char *before, const char *entry) |
| { |
| if (! before) |
| return __argz_add (argz, argz_len, entry); |
| |
| if (before < *argz || before >= *argz + *argz_len) |
| return EINVAL; |
| |
| if (before > *argz) |
| /* Make sure before is actually the beginning of an entry. */ |
| while (before[-1]) |
| before--; |
| |
| { |
| size_t after_before = *argz_len - (before - *argz); |
| size_t entry_len = strlen (entry) + 1; |
| size_t new_argz_len = *argz_len + entry_len; |
| char *new_argz = realloc (*argz, new_argz_len); |
| |
| if (new_argz) |
| { |
| before = new_argz + (before - *argz); |
| memmove (before + entry_len, before, after_before); |
| memmove (before, entry, entry_len); |
| *argz = new_argz; |
| *argz_len = new_argz_len; |
| return 0; |
| } |
| else |
| return ENOMEM; |
| } |
| } |
| weak_alias (__argz_insert, argz_insert) |
