| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Routines for dealing with '\0' separated arg vectors. |
| 2 | Copyright (C) 1995-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Written by Miles Bader <miles@gnu.ai.mit.edu> |
| 5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the License, or (at your option) any later version. |
| 10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <argz.h> |
| 21 | #include <string.h> |
| 22 | #include <stdlib.h> |
| 23 | |
| 24 | /* Insert ENTRY into ARGZ & ARGZ_LEN before BEFORE, which should be an |
| 25 | existing entry in ARGZ; if BEFORE is NULL, ENTRY is appended to the end. |
| 26 | Since ARGZ's first entry is the same as ARGZ, argz_insert (ARGZ, ARGZ_LEN, |
| 27 | ARGZ, ENTRY) will insert ENTRY at the beginning of ARGZ. If BEFORE is not |
| 28 | in ARGZ, EINVAL is returned, else if memory can't be allocated for the new |
| 29 | ARGZ, ENOMEM is returned, else 0. */ |
| 30 | error_t |
| 31 | __argz_insert (char **argz, size_t *argz_len, char *before, const char *entry) |
| 32 | { |
| 33 | if (! before) |
| 34 | return __argz_add (argz, argz_len, entry); |
| 35 | |
| 36 | if (before < *argz || before >= *argz + *argz_len) |
| 37 | return EINVAL; |
| 38 | |
| 39 | if (before > *argz) |
| 40 | /* Make sure before is actually the beginning of an entry. */ |
| 41 | while (before[-1]) |
| 42 | before--; |
| 43 | |
| 44 | { |
| 45 | size_t after_before = *argz_len - (before - *argz); |
| 46 | size_t entry_len = strlen (entry) + 1; |
| 47 | size_t new_argz_len = *argz_len + entry_len; |
| 48 | char *new_argz = realloc (*argz, new_argz_len); |
| 49 | |
| 50 | if (new_argz) |
| 51 | { |
| 52 | before = new_argz + (before - *argz); |
| 53 | memmove (before + entry_len, before, after_before); |
| 54 | memmove (before, entry, entry_len); |
| 55 | *argz = new_argz; |
| 56 | *argz_len = new_argz_len; |
| 57 | return 0; |
| 58 | } |
| 59 | else |
| 60 | return ENOMEM; |
| 61 | } |
| 62 | } |
| 63 | weak_alias (__argz_insert, argz_insert) |