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/* String descriptors.
Copyright (C) 2023 Free Software Foundation, Inc.
This file 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 3 of the
License, or (at your option) any later version.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2023. */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
/* Specification. */
#include "string-desc.h"
#include <string.h>
/* This function is in a separate compilation unit, because not all users
of the 'string-desc' module need this function and it depends on 'memmem'
which — depending on platforms — costs up to 2 KB of binary code. */
ptrdiff_t
string_desc_contains (string_desc_t haystack, string_desc_t needle)
{
if (needle._nbytes == 0)
return 0;
void *found =
memmem (haystack._data, haystack._nbytes, needle._data, needle._nbytes);
if (found != NULL)
return (char *) found - haystack._data;
else
return -1;
}
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