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sortix--sortix/libc/string/strcspn.c

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/*
* Copyright (c) 2011, 2012, 2014 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* string/strcspn.c
* Search a string for a set of characters.
*/
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#include <stdbool.h>
#include <string.h>
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size_t strcspn(const char* str, const char* reject)
{
size_t reject_length = 0;
while ( reject[reject_length] )
reject_length++;
for ( size_t result = 0; true; result++ )
{
char c = str[result];
if ( !c )
return result;
bool matches = false;
for ( size_t i = 0; i < reject_length; i++ )
{
if ( str[result] != reject[i] )
continue;
matches = true;
break;
}
if ( matches )
return result;
}
}