diff options
Diffstat (limited to 'REORG.TODO/string/argz-insert.c')
| -rw-r--r-- | REORG.TODO/string/argz-insert.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/REORG.TODO/string/argz-insert.c b/REORG.TODO/string/argz-insert.c new file mode 100644 index 0000000000..e4c78407ff --- /dev/null +++ b/REORG.TODO/string/argz-insert.c @@ -0,0 +1,63 @@ +/* Routines for dealing with '\0' separated arg vectors. + Copyright (C) 1995-2017 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) |