getcwd

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define MAX 512

int main(int argc, char * argv[])
{
    // 方法一
    char path[MAX];
    path[0] = '\0';
    getcwd(path, sizeof(path));
    puts(path);

    // 方法二
    char * buf = NULL;
    buf = getcwd(NULL, 0);
    puts(buf);
    free(buf);

    exit(EXIT_SUCCESS);
}