Microchip Technology XC8 Standard Compiler (Workstation) SW006021-1 SW006021-1 ユーザーズマニュアル

 2012 Microchip Technology Inc.

DS52053B-page 345

#include <string.h>

#include <stdio.h>

unsigned int ary[] = {1, 5, 0x6789, 0x23};

void 

main (void)

{

    char * cp;

    cp = memchr(ary, 0x89, sizeof ary);

    if(!cp)

        printf("Not found\n");

    else

        printf("Found at offset %u\n", cp - (char *)ary);

}

strchr()

A pointer to the first byte matching the argument if one exists; NULL otherwise.

#include <string.h>

 

int memcmp (const void * s1, const void * s2, size_t n)

The 

memcmp()

 function compares two blocks of memory, of length 

n

, and returns a 

signed value similar to strncmp(). Unlike strncmp() the comparison does not stop 
on a null character.

#include <stdio.h>

#include <string.h>

void 

main (void)

{

    int buf[10], cow[10], i;

    buf[0] = 1;

    buf[2] = 4;

    cow[0] = 1;

    cow[2] = 5;

    buf[1] = 3;

    cow[1] = 3;

    i = memcmp(buf, cow, 3*sizeof(int));

    if(i < 0)

        printf("Less than\n");

    else if(i > 0)

        printf("Greater than\n");

    else

        printf("Equal\n");

}