From c9f0ec1bda7b53f7bea01e8e02c9b9b1e843ce38 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Wed, 22 Nov 2023 21:36:45 +0300
Subject: [PATCH] rc

---
 TODO              |   2 +-
 builder/builder.c |   4 +-
 config.h          |   6 ++
 libmu/unused.h    |   2 +-
 shell/rc.c        | 141 +++++++++++++++++++++++++++++++++++++++++++++-
 sysutils/mount.c  |  18 ++++++
 6 files changed, 168 insertions(+), 5 deletions(-)
 create mode 100644 sysutils/mount.c

diff --git a/TODO b/TODO
index f9c7d30..ba44dd9 100644
--- a/TODO
+++ b/TODO
@@ -62,7 +62,7 @@ Findutils:
  xargs
 
 Shell:
- rc - run command
+ rc - run command (pipe, ~ | <> <<>> & " parsing)
 
 Init:
  sinit - Simple init
diff --git a/builder/builder.c b/builder/builder.c
index ed1bd1c..cf4195e 100644
--- a/builder/builder.c
+++ b/builder/builder.c
@@ -19,7 +19,7 @@ void remove_suffix(char *base, const char *suffix) {
 char *MakePath(const char *src, const char *output_dir) {
 	char *dup = strdup(src);
 	if (dup == NULL) {
-		fprintf(stderr, "builder: strdup failed");
+		fprintf(stderr, "builder: strdup failed\n");
 		exit(1);
 	}
 
@@ -51,7 +51,7 @@ void Compile(const char *src, const char *output_dir) {
 	}
 
 	else if (pid == -1) {
-		fprintf(stderr, "builder: fork failed");
+		fprintf(stderr, "builder: fork failed\n");
 		exit(1);
 	}
 
diff --git a/config.h b/config.h
index 62de33d..5b1760e 100644
--- a/config.h
+++ b/config.h
@@ -13,6 +13,12 @@
 /* block size (du)*/
 #define BLK_SIZE 512
 
+/* mount config */
+#define MOUNT_CFG "/etc/fstab"
+
+/* RunComm prompt */
+#define RC_PS "> "
+
 /* Options: To disable, comment line */
 /* Add escape-char support in echo */
 #define ECHO_FANCY
diff --git a/libmu/unused.h b/libmu/unused.h
index b31a8e3..09dfc9c 100644
--- a/libmu/unused.h
+++ b/libmu/unused.h
@@ -1,6 +1,6 @@
 #ifndef _UNUSED_H
 #define _UNUSED_H
 
-#define UNUSED(p) (void)p
+#define UNUSED(p) ((void)p)
 
 #endif
diff --git a/shell/rc.c b/shell/rc.c
index 061ed7e..ce4afeb 100644
--- a/shell/rc.c
+++ b/shell/rc.c
@@ -1,3 +1,142 @@
-int main(void) {
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include "config.h"
+#include "unused.h"
+
+#define TOK_DELIM " \t\r\n\a"
+unsigned int exit_flag;
+
+int rc_cd(char **args, char **envp);
+int rc_exit(char **args, char **envp);
+
+/* Builtin commands */
+char *cmd[] = {"cd", "exit", "which"};
+int (*func[])(char **args, char **envp) = {rc_cd, rc_exit};
+
+int rc_exit(char **args, char **envp) {
+	UNUSED(args);
+	UNUSED(envp);
+	exit_flag = 1;
+	return 0;
+}
+
+int rc_cd(char **args, char **envp) {
+	UNUSED(envp);
+
+	int status = 0;
+	if (args[0] == NULL)
+		status = chdir(getenv("HOME"));
+
+	else
+		status = chdir(args[0]);
+
+	if (status < 0) {
+		fprintf(stderr, "rc: cd: Not such directory\n");
+		return 1;
+	}
+
+	return 0;
+}
+
+/* Shell */
+int execute(char **tok, char **envp) {
+	if (tok[0] == NULL)
+		return 0;
+
+	for (size_t i = 0; i < sizeof(cmd) / sizeof(char *); i++)
+		if (!strcmp(tok[0], cmd[i]))
+			return func[i](tok + 1, envp);
+
+	/* TODO: pipe */
+	/* If its not builtin cmd */
+	pid_t pid;
+	if ((pid = fork()) == 0) {
+		if (pid == 1)
+			exit(1);
+
+		execvp(tok[0], tok);
+		exit(1);
+	}
+
+	if (pid == -1) {
+		fprintf(stderr, "rc: fork failed\n");
+		return 1;
+	}
+
+	int status = 0;
+	waitpid(pid, &status, 0);
+	return status;
+}
+
+char **tokenize(char *str) {
+	size_t buflen = 0;
+
+	char *p = str;
+	while (*p++)
+		if (*p == ' ')
+			buflen++;
+
+	char **tokens = malloc(sizeof(char *) * buflen);
+	if (tokens == NULL) {
+		fprintf(stderr, "rc: malloc failed\n");
+		exit(1);
+	}
+
+	char *token = strtok(str, TOK_DELIM);
+
+	int i = 0;
+	while (token != NULL) {
+		tokens[i] = token;
+		token = strtok(NULL, TOK_DELIM);
+		i++;
+	}
+
+	tokens[i] = NULL;
+	return tokens;
+}
+
+char *readline(FILE *fp, char *prompt) {
+	printf("%s", prompt);
+
+	char *str = NULL;
+	size_t len = 0;
+	if (getline(&str, &len, fp) == -1)
+		return NULL;
+
+	return str;
+}
+
+int main(int argc, char **argv, char **envp) {
+	UNUSED(argc);
+	UNUSED(argv);
+
+	char *prompt = RC_PS;
+	if (!isatty(STDIN_FILENO))
+		prompt = "";
+
+	while (!exit_flag) {
+		char *str = readline(stdin, prompt);
+		if (str == NULL)
+			break;
+
+		char **tok = tokenize(str);
+
+		int status = execute(tok, envp);
+		if (status)
+			setenv("status", "1", 1);
+
+		else
+			setenv("status", "0", 1);
+
+		free(tok);
+		free(str);
+	}
+
+	putchar('\n');
 	return 0;
 }
diff --git a/sysutils/mount.c b/sysutils/mount.c
new file mode 100644
index 0000000..4c8c128
--- /dev/null
+++ b/sysutils/mount.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "config.h"
+
+int main(int argc, char **argv) {
+	int opt;
+	while ((opt = getopt(argc, argv, "aro")) != -1) {
+		switch (opt) {
+			default:
+				printf("mount [DEVICE] [NODE]\n\t[-r Read only] [-o Options]\n\t[-a Mount all fs in %s]\n\nOptions:\n\tremount - Remount a mounted filesystem\n\tro - Read only\n", MOUNT_CFG);
+				return 0;
+		}
+	}
+
+	return 0;
+}