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sortix--sortix/libc/strspn.cpp
2012-12-14 14:13:36 +01:00

44 lines
1.4 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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/>.
strspn.cpp
Search a string for a set of characters.
*******************************************************************************/
#include <string.h>
extern "C" size_t strspn(const char* str, const char* accept)
{
size_t acceptlen = 0;
while ( accept[acceptlen] ) { acceptlen++; }
for ( size_t result = 0; true; result++ )
{
char c = str[result];
if ( !c ) { return result; }
bool matches = false;
for ( size_t i = 0; i < acceptlen; i++ )
{
if ( str[result] != accept[i] ) { continue; }
matches = true;
break;
}
if ( !matches ) { return result; }
}
}