strchrnul.c File Reference

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

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Macros
#define	ALIGN   (sizeof(size_t))
#define	ONES   ((size_t)-1 / UCHAR_MAX)
#define	HIGHS   (ONES * (UCHAR_MAX / 2 + 1))
#define	HASZERO(x)   ((x)-ONES & ~(x)&HIGHS)

Functions
char *	__strchrnul (const char *s, int c)

Macro Definition Documentation

ALIGN

#define ALIGN   (sizeof(size_t))

Definition at line 8 of file strchrnul.c.

HASZERO

#define HASZERO

(

x

)

((x)-ONES & ~(x)&HIGHS)

Definition at line 11 of file strchrnul.c.

HIGHS

#define HIGHS   (ONES * (UCHAR_MAX / 2 + 1))

Definition at line 10 of file strchrnul.c.

ONES

#define ONES   ((size_t)-1 / UCHAR_MAX)

Definition at line 9 of file strchrnul.c.

Function Documentation

__strchrnul()

char* __strchrnul	(	const char *	s,
		int	c
	)

Definition at line 13 of file strchrnul.c.

{
    const size_t* w;
    size_t k;
    c = (unsigned char)c;

    if(!c)
    {
        return (char*)(uintptr_t)s + strlen(s);
    }

    for(; (uintptr_t)s % ALIGN; s++)
    {
        if(!*s || *(const unsigned char*)s == c)
        {
            return (char*)(uintptr_t)s;
        }
    }

    k = ONES * (unsigned long)c;

    for(w = (const void*)s; !HASZERO(*w) && !HASZERO(*w ^ k); w++)
    {
        {
            ;
        }
    }
    for(s = (const void*)w; *s && *(const unsigned char*)s != c; s++)
    {
        {
            ;
        }
    }

    return (char*)(uintptr_t)s;
}

References ALIGN, HASZERO, ONES, and strlen().

Referenced by strchr(), and strcspn().

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