126 lines
2.6 KiB
C
126 lines
2.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <sys/wait.h>
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#include "commands.h"
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#include "history.h"
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// Function declarations for builtin commands
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int cd(char **args);
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int help(char **args);
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int quit(char **args);
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int history(char **args);
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// List of builtin commands' names
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char *builtin_cmds[] = {
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"cd",
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"help",
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"exit",
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"history"
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};
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int (*builtin_func[]) (char **) = {
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&cd,
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&help,
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&quit, // cant name it exit as it is taken
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&history
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};
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// number of built in commands
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int num_builtins() {
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return sizeof(builtin_cmds) / sizeof(char *);
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}
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// change directory
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int cd(char **args) {
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if (args[1] == NULL) {
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char *home = getenv("HOME");
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if (chdir(home) != 0) {
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perror("rush");
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}
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} else {
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if (chdir(args[1]) != 0) {
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perror("rush");
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}
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}
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return 1;
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}
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// show help menu
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int help(char **args) {
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printf("rush v0.01-alpha\n");
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printf("Built in commands:\n");
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for (int i = 0; i < num_builtins(); i++) {
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printf(" %s\n", builtin_cmds[i]);
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}
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printf("Use 'man' to read manual of programs\n");
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printf("Licensed under GPL v3\n");
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return 1;
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}
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int quit(char **args) {
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return 0; // exit prompting loop, which also the shell
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}
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int history(char **args) {
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char **history = get_all_history();
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for (int i = 0; history[i] != NULL; ++i) {
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printf("%s\n", history[i]);
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free(history[i]);
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}
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free(history);
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return 1;
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}
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bool is_builtin(char *command) {
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for (int i = 0; i < num_builtins(); i++) {
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if (strcmp(command, builtin_cmds[i]) == 0) {
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return true;
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}
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}
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return false;
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}
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// execute built in commands or launch commands and wait it to terminate, return 1 to keep shell running
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int execute(char **args) {
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if (args[0] == NULL) { // An empty command was entered.
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return 1;
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}
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for (int i = 0; i < num_builtins(); i++) {
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if (strcmp(args[0], builtin_cmds[i]) == 0) {
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return (*builtin_func[i])(args);
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}
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}
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pid_t pid, wpid;
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int status;
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pid = fork();
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if (pid == 0) {
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// Child process
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if (execvp(args[0], args) == -1) {
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if (errno == ENOENT) {
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fprintf(stderr, "rush: command not found: %s\n", args[0]);
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}
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}
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exit(EXIT_FAILURE);
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} else if (pid < 0) {
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perror("Cannot fork");
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} else {
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// Parent process
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do {
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wpid = waitpid(pid, &status, WUNTRACED);
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} while (!WIFEXITED(status) && !WIFSIGNALED(status));
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}
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return 1;
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}
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