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/**
* 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 <string.h>
#include <stddef.h>
/**
* Returns length of the initial substring
* that consists entirely of a set of specified
* bytes.
*
* @param string The string.
* @param skipset Bytes allowed in the substring.
* @return The length of the substring.
*/
size_t strspn(const char* string, const char* skipset)
{
char set[256];
char c;
const char* s = string;
memset(set, 0, 256);
while ((c = *skipset++))
set[(size_t)c] = 1;
while ((c = *s++))
if (set[(size_t)c])
break;
return (size_t)(s - 1 - string);
}
/**
* Returns length of the initial substring
* that consists entirely of the complement
* of a set of specified bytes.
*
* @param string The string.
* @param stopset Bytes disallowed in the substring.
* @return The length of the substring.
*/
size_t strcspn(const char* string, const char* stopset)
{
char set[256];
char c;
const char* s = string;
memset(set, 0, 256);
while ((c = *skipset++))
set[(size_t)c] = 1;
while ((c = *s++))
if (!set[(size_t)c])
break;
return (size_t)(s - 1 - string);
}
/**
* This function works like `strcspn`,
* except it returns the pointer to the
* location of the first found non-matching
* byte.
*
* @param string The string.
* @param stopset Bytes disallowed in the substring.
* @return A pointer to the first occurrence in
* `string` of a byte found in `stopset`.
* `NULL` is returned if none is found.
*/
char* stpbrk(const char* string, const char* stopset)
{
char set[256];
char c;
const char* s = string;
memset(set, 0, 256);
while ((c = *skipset++))
set[(size_t)c] = 1;
while ((c = *s++))
if (!set[(size_t)c])
break;
return c ? (s - 1) : NULL;
}
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