strchr.c File Reference

#include <string.h>

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Functions
char *	__strchrnul (const char *, int)
char *	strchr (const char *s, int c)
	Finds the first occurrence of c in the null-terminated byte string pointed to by s. More...

Function Documentation

__strchrnul()

char* __strchrnul	(	const char *	,
		int
	)

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;
}

Referenced by strchr(), and strcspn().

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strchr()

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

Finds the first occurrence of c in the null-terminated byte string pointed to by s.

Finds the first occurrence of c (after conversion to char as if by (char)c ) in the null-terminated byte string pointed to by s (each character interpreted as unsigned char). The terminating null character is considered to be a part of the string and can be found when searching for '\0'.

The behavior is undefined if s is not a pointer to a null-terminated byte string.

Parameters

s	pointer to the null-terminated byte string to be analyzed
c	character to search for

Returns

a pointer to the found character in s, or null pointer if no such character is found.

Definition at line 7 of file strchr.c.

{
    char* r = __strchrnul(s, c);
    return *(unsigned char*)r == (unsigned char)c ? r : 0;
}

References __strchrnul().