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ls.c
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ls.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
int main(int argc, char** argv) {
int i, option_flag = 0, a_flag = 0, i_flag = 0, number_directories = 0;
char* directory_names[100];
for (i = 1; i < argc; i++) {
if (argv[i][strlen(argv[i]) - 1] == '\n')
argv[i][strlen(argv[i]) - 1] = '\0';
if (argv[i][0] == '-') {
option_flag = 1;
if (!strcmp(argv[i], "-a")) a_flag = 1;
else if (!strcmp(argv[i], "-i")) i_flag = 1;
else printf("Invalid option '%s'!!\n", argv[i]);
}
else {
directory_names[number_directories++] = argv[i];
}
}
if (number_directories == 0) {
char directory[1000];
getcwd(directory, sizeof(directory));
char* wdirectory = strdup(directory);
DIR* mydir = opendir(wdirectory);
if (mydir == NULL) {
printf("Directory '%s' not found!!\n", wdirectory);
}
else {
struct dirent* dentry;
while ((dentry = readdir(mydir)) != NULL) {
if (!a_flag && dentry->d_name[0] == '.') {
continue;
}
else {
if (i_flag) printf("%lu ", dentry->d_ino);
printf("%s\t", dentry->d_name);
}
}
printf("\n");
}
}
else {
for (i = 0; i < number_directories; i++) {
char* dirname = directory_names[i];
DIR* mydir = opendir(dirname);
if (mydir == NULL) {
printf("Directory '%s' not found!!\n", dirname);
}
else {
struct dirent* dentry;
printf("%s:\n", dirname);
while ((dentry = readdir(mydir)) != NULL) {
if (!a_flag && dentry->d_name[0] == '.') {
continue;
}
else {
if (i_flag) printf("%lu ", dentry->d_ino);
printf("%s\t", dentry->d_name);
}
}
printf("\n");
}
}
}
return 0;
}