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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 // not setting a macro for the argument because they are included in the command)
#define MAX_PATH_LENGTH 1024
struct command {
char *com;
char *arg;
};
struct exec_command {
const char *cmd;
void (*func)(const char *);
};
// code prototype functions
struct command split_command(char *input);
void exec_command(char *input);
// code functions
struct command split_command(char *input) {
struct command 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 {
free(argument);
}
return NEW_COMMAND;
}
void exec_command(char *input) {
struct command NEW_COMMAND = {};
// cycle through the command array and find the matching command and execute it
}
// shell commands functions prototypes
void list(const char *path);
void make_dir(const char *path);
void remove_dir(const char *path);
void remove_file(const char *path);
void copy_files(const char *source, const char *dest);
void move_files(const char *source, const char *dest);
char *print_cdirectory();
void change_directory(const char *path);
void clear();
struct exec_command CommandsList[] = {
{"ls", ls},
};
// code functions
struct command split_command(char *input) {
struct command 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 {
free(argument);
}
return NEW_COMMAND;
}
void exec_command(char *input) {
const struct command user_command = split_command(input);
user_command.com[strcspn(user_command.com, "\n")] = '\0';
if (user_command.arg != NULL) {
user_command.arg[strcspn(user_command.arg, "\n")] = '\0';
}
for (int i = 0; i < sizeof(*CommandsList) / sizeof(CommandsList->cmd[0]); i++) {
// ReSharper disable once CppIncompatiblePointerConversion
if (strcmp(user_command.com, &CommandsList->cmd[i]) == 0) {
CommandsList[i].func(user_command.arg);
}
}
}
// shell command functions
// ls command
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) {
printf("%s\n", entry->d_name);
}
closedir(dP);
}
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");
}
char *print_cdirectory() {
char *current_working_directory = getcwd(NULL, 0);
/* getcwd() command already allocates malloc for the path that should be returned,
to do: should I free it when finished or not?/
so what I understand from the documentation, you should only free it when actually setting an exact size
but when keeping the max size to 0 and relying on the malloc there is no need for it
not sure though
should rely on further debugging
*/
return current_working_directory;
}
void change_directory(const char *path) {
if (path == NULL) {
printf("No path found\n");
}
}
int main(void) {
clear();
while (1) {
printf("\n$ ");
char *input = malloc(sizeof(char *) * MAX_COMMAND_LENGTH);
fgets(input, MAX_COMMAND_LENGTH, stdin);
const struct command 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);
if (new_input.arg != NULL) {
free(new_input.arg);
}
}
if (strcmp(new_input.com, "echo") == 0) {
printf("%s", new_input.arg);
free(new_input.arg);
}
if (strcmp(new_input.com, "clear") == 0) {
clear();
}
}
}
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