From 076ec8f540b8c90d66170b0b307dbebc291681b4 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Sun, 5 Nov 2023 21:42:26 +0300
Subject: [PATCH] dmesg

---
 builder/builder.c | 12 ++++-----
 builder/config.h  |  4 ++-
 coreutils/cmp.c   |  3 +++
 obj/.gitignore    |  0
 sysutils/dmesg.c  | 65 +++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 77 insertions(+), 7 deletions(-)
 delete mode 100644 obj/.gitignore
 create mode 100644 sysutils/dmesg.c

diff --git a/builder/builder.c b/builder/builder.c
index d4da446..34010c7 100644
--- a/builder/builder.c
+++ b/builder/builder.c
@@ -33,6 +33,7 @@ char *MakePath(const char *src, const char *output_dir) {
 
 void Compile(const char *src, const char *output_dir) {
 	char *path = MakePath(src, output_dir);
+	printf("[CC] Building %s -> %s\n", src, path);
 
 	size_t len = strlen(CC) + strlen(CFLAGS) + strlen(src) + strlen(path) + 7;
 	char *arg = malloc(len + 1);
@@ -50,21 +51,20 @@ void Compile(const char *src, const char *output_dir) {
 }
 
 void ListAndCompile(const char *dir, const char *output_dir) {
-	chdir(dir);
-	DIR *dp = opendir(".");
-	if (dp == NULL) {
-		fprintf(stderr, "builder: %s\n", strerror(errno));
+	printf("[CHDIR] %s\n", dir);
+	if (chdir(dir) < 0) {
+		fprintf(stderr, "builder: %s: %s\n", dir, strerror(errno));
 		exit(1);
 	}
 
+	DIR *dp = opendir(".");
+
 	struct dirent *ep;
 	while ((ep = readdir(dp)) != NULL) {
 		if (!strcmp(ep->d_name, ".") || !strcmp(ep->d_name, ".."))
 			continue;
 
-		printf("[INFO] Building %s\n", ep->d_name);
 		Compile(ep->d_name, output_dir);
-
 	}
 
 	closedir(dp);
diff --git a/builder/config.h b/builder/config.h
index 7878969..1041f5a 100644
--- a/builder/config.h
+++ b/builder/config.h
@@ -4,6 +4,8 @@
 const char *objects[] = {
 	"console-tools",
 	"coreutils",
+	"loginutils",
+	"sysutils",
 	"networking",
 	"procps",
 	"shell"
@@ -14,5 +16,5 @@ const char *libs[] = {
 };
 
 #define CFLAGS "-Wall -Wextra -pedantic -Os -s -I ../libmu"
-#define CC "tcc"
+#define CC "cc"
 #endif
diff --git a/coreutils/cmp.c b/coreutils/cmp.c
index c1af7d9..6073494 100644
--- a/coreutils/cmp.c
+++ b/coreutils/cmp.c
@@ -77,12 +77,15 @@ int main(const int argc, const char **argv) {
 	switch (argc - i) {
 		case 4:
 			skip2 = parse_int(argv[i + 3]);
+			/* fallthrough */
 
 		case 3:
 			skip1 = parse_int(argv[i + 2]);
+			/* fallthrough */
 
 		case 2:
 			fp2 = file_open(argv[i + 1]);
+			/* fallthrough */
 
 		case 1:
 			fp1 = file_open(argv[i]);
diff --git a/obj/.gitignore b/obj/.gitignore
deleted file mode 100644
index e69de29..0000000
diff --git a/sysutils/dmesg.c b/sysutils/dmesg.c
new file mode 100644
index 0000000..2bbe110
--- /dev/null
+++ b/sysutils/dmesg.c
@@ -0,0 +1,65 @@
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/klog.h>
+#define BUF_SIZE 8196
+
+int main(const int argc, const char **argv) {
+	unsigned int s_size = 0;
+	unsigned int n_level = 0;
+
+	int i;
+	for (i = 1; i < argc; i++) {
+		if (argv[i][0] != '-')
+			break;
+
+		else if (!strncmp(argv[i], "-s=", 3))
+			s_size = atoi(argv[i] + 3);
+
+		else if (!strncmp(argv[i], "-n=", 3))
+			n_level = atoi(argv[i] + 3);
+
+		else if (!strcmp(argv[i], "--help")) {
+			printf("dmesg [-n=L Set console logging level] [-s=S Buffer Size]\n");
+			return 0;
+		}
+	}
+
+	/* Setup */
+	if (n_level)
+		if (klogctl(8, NULL, (long)n_level) < 0) {
+			fprintf(stderr, "dmesg: %s\n", strerror(errno));
+			return 1;
+		}
+
+	if (!s_size)
+		s_size = klogctl(10, NULL, 0);
+
+	/* Get kernel log */
+	char *buf = malloc(s_size + 1);
+	if (buf == NULL) {
+		fprintf(stderr, "dmesg: malloc failed\n");
+		return 1;
+	}
+
+	int n = klogctl(3, buf, s_size);
+	if (n <= 0) {
+		free(buf);
+		if (n == 0)
+			return 0;
+
+		fprintf(stderr, "dmesg: %s\n", strerror(errno));
+		return 1;
+	}
+
+	/* Print */
+	write(STDOUT_FILENO, buf, n);
+	putchar('\n');
+
+	free(buf);
+	return 0;
+}
+