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Add wcsstr(3).

This commit is contained in:
Jonas 'Sortie' Termansen 2013-09-16 14:41:16 +02:00
parent 2e46a6ce8c
commit f32e1c7951
3 changed files with 50 additions and 2 deletions
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1
libc/Makefile
View File

@ -192,6 +192,7 @@ wchar/wcspbrk.o \
wchar/wcsrchr.o \
wchar/wcsrtombs.o \
wchar/wcsspn.o \
wchar/wcsstr.o \
wchar/wcstok.o \
wchar/wcstoll.o \
wchar/wcstol.o \

3
libc/include/wchar.h
View File

@ -80,6 +80,7 @@ wchar_t* wcspbrk(const wchar_t*, const wchar_t*);
wchar_t* wcsrchr(const wchar_t*, wchar_t);
size_t wcsrtombs(char* __restrict, const wchar_t** __restrict, size_t, mbstate_t* __restrict);
size_t wcsspn(const wchar_t*, const wchar_t*);
wchar_t* wcsstr(const wchar_t* __restrict, const wchar_t* __restrict);
wchar_t* wcstok(wchar_t* __restrict, const wchar_t* __restrict, wchar_t** __restrict);
long long wcstoll(const wchar_t* __restrict, wchar_t** __restrict, int);
long wcstol(const wchar_t* __restrict, wchar_t** __restrict, int);
@ -114,8 +115,6 @@ int wscanf(const wchar_t* __restrict, ...);
long double wcstold(const wchar_t* __restrict, wchar_t** __restrict);
size_t wcsftime(wchar_t* __restrict, size_t, const wchar_t* __restrict, const struct tm* __restrict);
wchar_t* fgetws(wchar_t* __restrict, int, FILE* __restrict);
wchar_t* wcsstr(const wchar_t* __restrict, const wchar_t* __restrict);
wchar_t* wcswcs(const wchar_t*, const wchar_t*);
wchar_t* wmemchr(const wchar_t*, wchar_t, size_t);
wchar_t* wmemcpy(wchar_t* __restrict, const wchar_t* __restrict, size_t);
wchar_t* wmemmove(wchar_t*, const wchar_t*, size_t);

48
libc/wchar/wcsstr.cpp Normal file
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@ -0,0 +1,48 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix 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 3 of the License, or (at your
option) any later version.
The Sortix 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 Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
wchar/wcsstr.cpp
Locate a wide substring.
*******************************************************************************/
#include <wchar.h>
// TODO: This simple and hacky implementation runs in O(N^2) even though this
// problem can be solved in O(N).
extern "C"
wchar_t* wcsstr(const wchar_t* restrict haystack,
const wchar_t* restrict needle)
{
if ( !needle[0] )
return (wchar_t*) haystack;
for ( size_t i = 0; haystack[i]; i++ )
{
bool diff = false;
for ( size_t j = 0; needle[j]; j++ )
{
if ( (diff = haystack[i+j] != needle[j]) )
break;
}
if ( diff )
continue;
return (wchar_t*) haystack + i;
}
return NULL;
}