/*
 * 测试通过时输出：
 * "getcwd OK."
 * 测试失败时输出：
 * "getcwd ERROR."
 */
#define __LIBRARY__
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char * getcwd(char * buf, size_t size)
{
    long __res;
    __asm__ volatile ("int $0x80" \
        : "=a" (__res) \
        : "0" (__NR_getcwd),"b" ((long)(buf)),"c" ((long)(size))); \
    if (__res > 0)
        return (char *) __res;
    errno = -__res;
    return NULL;
}

void test_getcwd(void){
    char *cwd = NULL;
    char buf[128] = {0};
    cwd = getcwd(buf, 128);
    if(cwd != NULL) {
        printf("current dir: %s\n", buf);
        printf("getcwd OK.\n");
    } 
    else printf("getcwd ERROR.\n");
}

int main(void){
    test_getcwd();
    return 0;
}