CMFA/module_03.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <unistd.h>
//#include "log.h"

#define BOLD_GRAY "\033[1;90m"
#define RED "\033[0;31m"
#define WHITE "\033[0;37m"
#define RESET "\033[0m"

int module_03_run(const char *filename) {
    char log_msg[1024];

    struct stat st;
    if (stat(filename, &st) != 0) {
        snprintf(log_msg, sizeof(log_msg), BOLD_GRAY " Library libstat: " RED "File type not recognized: %s" RESET, strerror(errno));
        printf("%s\n", log_msg);
//        log_message(log_msg);
        return 1;
    }

    const char *type;
    char extra_info[512] = "";
    if (S_ISREG(st.st_mode)) {
        type = "regular file";
    } else if (S_ISDIR(st.st_mode)) {
        type = "directory";
    } else if (S_ISCHR(st.st_mode)) {
        type = "character device";
        snprintf(extra_info, sizeof(extra_info), ", Major: %d, Minor: %d",
                 major(st.st_rdev), minor(st.st_rdev));
    } else if (S_ISBLK(st.st_mode)) {
        type = "block device";
        snprintf(extra_info, sizeof(extra_info), ", Major: %d, Minor: %d",
                 major(st.st_rdev), minor(st.st_rdev));
    } else if (S_ISFIFO(st.st_mode)) {
        type = "FIFO (named pipe)";
    } else if (S_ISSOCK(st.st_mode)) {
        type = "socket";
    } else if (S_ISLNK(st.st_mode)) {
        type = "symbolic link";
        char link_target[256];
        ssize_t len = readlink(filename, link_target, sizeof(link_target) - 1);
        if (len != -1) {
            link_target[len] = '\0';
            snprintf(extra_info, sizeof(extra_info), ", Points to: %s", link_target);
        } else {
            snprintf(extra_info, sizeof(extra_info), ", Error reading link: %s", strerror(errno));
        }
    } else {
        type = "unknown";
    }

    if (strncmp(filename, "/proc/", 6) == 0) {
        type = "procfs pseudo-file";
    } else if (strncmp(filename, "/sys/", 5) == 0) {
        type = "sysfs pseudo-file";
    }

    snprintf(log_msg, sizeof(log_msg), BOLD_GRAY " Library libstat: " WHITE "Size: %ld bytes, Permissions: %o, Type: %s%s" RESET,
             (long)st.st_size, st.st_mode & 0777, type, extra_info);
    printf("%s\n", log_msg);
//    log_message(log_msg);
    return 0;
}