strcspn.c File Reference

#include "strchrnul.h"
#include <stdint.h>
#include <string.h>

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Macros
#define	BITOP(a, b, op)   ((a)[(size_t)(b) / (8 * sizeof *(a))] op(size_t) 1 << ((size_t)(b) % (8 * sizeof *(a))))

Functions
size_t	strcspn (const char *s, const char *c)

Macro Definition Documentation

BITOP

#define BITOP	(		a,
			b,
			op
	)		((a)[(size_t)(b) / (8 * sizeof *(a))] op(size_t) 1 << ((size_t)(b) % (8 * sizeof *(a))))

Definition at line 5 of file strcspn.c.

Function Documentation

strcspn()

size_t strcspn	(	const char *	s,
		const char *	c
	)

Definition at line 8 of file strcspn.c.

{
    const char* a = s;
    size_t byteset[32 / sizeof(size_t)];

    if(!c[0] || !c[1])
    {
        return (uintptr_t)(__strchrnul(s, *c) - (uintptr_t)a);
    }

    memset(byteset, 0, sizeof byteset);
    for(; *c && BITOP(byteset, *(const unsigned char*)c, |=); c++)
    {
        {
            ;
        }
    }
    for(; *s && !BITOP(byteset, *(const unsigned char*)s, &); s++)
    {
        {
            ;
        }
    }
    return (uintptr_t)s - (uintptr_t)a;
}

References __strchrnul(), BITOP, and memset().

Referenced by strpbrk().

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