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64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* Routines for dealing with '\0' separated arg vectors.
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Copyright (C) 1995-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Miles Bader <miles@gnu.ai.mit.edu>
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <argz.h>
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#include <string.h>
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#include <stdlib.h>
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/* Insert ENTRY into ARGZ & ARGZ_LEN before BEFORE, which should be an
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existing entry in ARGZ; if BEFORE is NULL, ENTRY is appended to the end.
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Since ARGZ's first entry is the same as ARGZ, argz_insert (ARGZ, ARGZ_LEN,
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ARGZ, ENTRY) will insert ENTRY at the beginning of ARGZ. If BEFORE is not
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in ARGZ, EINVAL is returned, else if memory can't be allocated for the new
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ARGZ, ENOMEM is returned, else 0. */
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error_t
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__argz_insert (char **argz, size_t *argz_len, char *before, const char *entry)
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{
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if (! before)
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return __argz_add (argz, argz_len, entry);
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if (before < *argz || before >= *argz + *argz_len)
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return EINVAL;
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if (before > *argz)
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/* Make sure before is actually the beginning of an entry. */
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while (before[-1])
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before--;
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{
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size_t after_before = *argz_len - (before - *argz);
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size_t entry_len = strlen (entry) + 1;
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size_t new_argz_len = *argz_len + entry_len;
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char *new_argz = realloc (*argz, new_argz_len);
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if (new_argz)
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{
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before = new_argz + (before - *argz);
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memmove (before + entry_len, before, after_before);
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memmove (before, entry, entry_len);
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*argz = new_argz;
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*argz_len = new_argz_len;
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return 0;
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}
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else
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return ENOMEM;
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}
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}
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weak_alias (__argz_insert, argz_insert)
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