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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <unistd.h>
#define MAX_HISTORY 100
#define MAX_COMMAND_LENGTH 255
struct com_struct {
char *com;
char *arg;
int error; // 0: okay 1: not okay
};
void test() {
printf("\nprint to output");
}
// ls command
// get the requested path and put it into a const later on when getting the user input
void ls(const char *path) {
struct dirent *entry;
if (path == NULL) {
printf("No path found\n");
return;
}
DIR *dP = opendir(path);
// check if the directory got opened successfully
if (dP == NULL) {
perror("opendir");
return;
}
// print the folder|directory name
while ((entry = readdir(dP)) != NULL) {
char *temporary_variable = entry->d_name;
printf("%s\n", entry->d_name);
}
closedir(dP);
}
struct com_struct split_command(char *input) {
struct com_struct NEW_COMMAND = {};
char *command = strtok(input, " ");
char *argument = strtok(NULL, " ");
if (command != NULL) {
NEW_COMMAND.com = strdup(command);
} else {
printf("failed, null pointer detected, no initial command has been inserted");
free(command);
}
if (argument != NULL) {
NEW_COMMAND.arg = strdup(argument);
} else {
printf("failed, null pointer detected, no argument has been added");
free(argument);
}
return NEW_COMMAND;
}
void clear() {
// clear the visible part of the terminal -> see man pages clear command
printf("\033[2J");
// clear the input buffer of the terminal -> see man pages clear command
printf("\033[3J");
}
void change_directory(const char *path) {
if (path == NULL) {
printf("No path found\n");
return;
}
}
int main(void) {
clear();
while (1) {
printf("\n$ ");
char *input = malloc(sizeof(char *) * MAX_COMMAND_LENGTH);
fgets(input, MAX_COMMAND_LENGTH, stdin);
const struct com_struct new_input = split_command(input);
new_input.com[strcspn(new_input.com, "\n")] = '\0';
if (new_input.arg != NULL) {
new_input.arg[strcspn(new_input.arg, "\n")] = '\0';
}
if (strcmp(new_input.com, "exit") == 0) {
free(input);
return 0;
}
if (strcmp(new_input.com, "ls") == 0) {
ls(new_input.arg);
free(new_input.com);
free(new_input.arg);
}
if (strcmp(new_input.com, "echo") == 0) {
printf("%s", new_input.arg);
free(new_input.arg);
}
}
}
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