/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <wchar.h>
#include <stddef.h>
/**
* Find the first occurrence of a wide character
* in a memory segment.
*
* @param segment The memory segment to search.
* @param c The sought after character.
* @param size The size of the memory segment.
* @return Pointer to the first occurrence of `c`,
* `NULL` if none were found.
*/
wchar_t* wmemchr(const wchar_t* segment, wchar_t c, size_t size)
{
while (size--)
if (*segment++ == c)
return segment - 1;
return NULL;
}
/**
* Find the first occurrence of a wide character in a
* memory segment. The memory segment must be known to
* contain the sought after character.
*
* This is a slibc extension added for completeness.
*
* @param segment The memory segment to search.
* @param c The sought after character.
* @return Pointer to the first occurrence of `c`.
*/
wchar_t* rawwmemchr(const wchar_t* segment, wchar_t c)
{
for (;;)
if (*segment++ == c)
return segment - 1;
}
/**
* Find the last occurrence of a wide character in
* a memory segment.
*
* For improved performace, use this function instead
* of `wcssrchr` if you already know the length of the
* string.
*
* This is a slibc extension added for completeness.
*
* @param segment The memory segment to search.
* @param c The sought after character.
* @param size The size of the memory segment.
* @return Pointer to the last occurrence of `c`,
* `NULL` if none were found.
*/
wchar_t* wmemrchr(const wchar_t* segment, wchar_t c, size_t size)
{
while (size--)
if (segment[size] == c)
return segment + size;
return NULL;
}
/**
* Find the first occurrence of a wide character in a string.
*
* @param string The string to search.
* The terminating NUL character is
* considered a part of the string.
* @param c The sought after character.
* @return Pointer to the first occurrence of `c`,
* `NULL` if none were found.
*/
wchar_t* wcschr(const wchar_t* string, wchar_t c)
{
for (;;)
if (*string == c)
return string;
else if (!*string++)
return NULL;
}
/**
* Find the first occurrence of a wide character in a
* string, or if there is no such character, the end of
* the string.
*
* This is a GNU-compliant slibc extension.
*
* @param string The string to search.
* The terminating NUL character is
* considered a part of the string.
* @param c The sought after character.
* @return Pointer to the first occurrence of `c`,
* Pointer to the terminating NUL character
* if none were found.
*/
wchar_t* wcschrnul(const wchar_t* string, wchar_t c)
{
for (;; string++)
if (*string == c)
return string;
else if (!*string)
return string;
}
/**
* Find the last occurrence of a wide character in a string.
*
* For improved performace, use `wmemrchr` instead of
* this function if you already know the length of the
* string.
*
* @param string The string to search.
* The terminating NUL character is
* considered a part of the string.
* @param c The sought after character.
* @return Pointer to the last occurrence of `c`,
* `NULL` if none were found.
*/
wchar_t* wcsrchr(const wchar_t* string, wchar_t c)
{
wchar_t* r = NULL;
for (;;)
if (*string == c)
r = string;
else if (!*string++)
return r;
}
