strncmp.c File Reference

#include <string.h>

Include dependency graph for strncmp.c:

Go to the source code of this file.

Functions
int __cdecl	strncmp (const char *first, const char *last, size_t count)

Function Documentation

strncmp()

int __cdecl strncmp	(	const char *	first,
		const char *	last,
		size_t	count
	)

Definition at line 40 of file strncmp.c.

{
    size_t x = 0;
 
    if (!count)
    {
        return 0;
    }
 
    /*
     * This explicit guard needed to deal correctly with boundary
     * cases: strings shorter than 4 bytes and strings longer than
     * UINT_MAX-4 bytes .
     */
    if( count >= 4 )
    {
        /* unroll by four */
        for (; x < count-4; x+=4)
        {
            first+=4;
            last +=4;
 
            if (*(first-4) == 0 || *(first-4) != *(last-4))
            {
                return(*(unsigned char *)(first-4) - *(unsigned char *)(last-4));
            }
 
            if (*(first-3) == 0 || *(first-3) != *(last-3))
            {
                return(*(unsigned char *)(first-3) - *(unsigned char *)(last-3));
            }
 
            if (*(first-2) == 0 || *(first-2) != *(last-2))
            {
                return(*(unsigned char *)(first-2) - *(unsigned char *)(last-2));
            }
 
            if (*(first-1) == 0 || *(first-1) != *(last-1))
            {
                return(*(unsigned char *)(first-1) - *(unsigned char *)(last-1));
            }
        }
    }
 
    /* residual loop */
    for (; x < count; x++)
    {
        if (*first == 0 || *first != *last)
        {
            return(*(unsigned char *)first - *(unsigned char *)last);
        }
        first+=1;
        last+=1;
    }
 
    return 0;
}

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