myfind/is_newer/is_newer.c


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#include <stdio.h>
#include <sys/stat.h>

#define _POSIX_C_SOURCE 200809L

int main(int argc, char **argv)
{
    if (argc != 3)
        return 2;

    struct stat f1;
    if (stat(argv[1], &f1))
        return 2;
    struct stat f2;
    if (stat(argv[2], &f2))
        return 2;

    printf("%s is ", argv[1]);
    if (f2.st_mtime == f1.st_mtime)
    {
        if (f2.st_mtim.tv_nsec >= f1.st_mtim.tv_nsec)
            printf("not ");
    }
    else if (f2.st_mtime > f1.st_mtime)
        printf("not ");
    printf("newer than %s\n", argv[2]);

    return 0;
}