micro-utils/coreutils/ls.c

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>

int list(const char *path, int flag, int label) {
	struct stat statbuf;
	if (stat(path, &statbuf)) {
		fprintf(stderr, "ls: unable to stat %s: %s\n", path, strerror(errno));
		return 1;
	}

	/* If its file */
	if (S_ISDIR(statbuf.st_mode) == 0) {
		puts(path);
		return 0;
	}

	/* Make label */
	if (label)
		printf("\n%s: \n", path);

	/* Open and print dir */
	struct dirent *ep;
	DIR *dp = opendir(path);
	if (dp == NULL) {
		fprintf(stderr, "ls: %s: %s\n", path, strerror(errno));
		return 1;
	}

	while ((ep = readdir(dp)) != NULL) {
		if (ep->d_name[0] == '.' && !flag)
			continue;

		printf("%s ", ep->d_name);
	}

	closedir(dp);
	printf("\n");
	return 0;
}



int main(const int argc, const char **argv) {
	int flag = 0;

	int i;
	for (i = 1; i < argc; i++) {
		if (argv[i][0] != '-')
			break;

		else if (!strcmp(argv[i], "-a"))
			flag = 1;

		else if (!strcmp(argv[i], "-h")) {
			printf("ls [-a (Show hidden files)] [Path]\n");
			return 0;
		}
	}

	if (i == argc)
		return list(".", flag, 0);

	if (i == argc - 1)
		return list(argv[i], flag, 0);

	else
		for (int i = 1; i < argc; i++)
			if (list(argv[i], flag, 1))
				return 1;
	return 0;
}