From f1bba77e6ed7d0fd0b8ad19853492ddab380bc6d Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Mon, 6 Nov 2023 13:41:52 +0300
Subject: [PATCH] truncate

---
 TODO                 | 13 ++++++++----
 coreutils/chown.c    | 19 +++---------------
 coreutils/rm.c       |  2 +-
 coreutils/shred.c    |  1 +
 coreutils/touch.c    |  1 -
 coreutils/truncate.c | 47 ++++++++++++++++++++++++++++++++++++++++++++
 obj/.gitignore       |  0
 7 files changed, 61 insertions(+), 22 deletions(-)
 create mode 100644 coreutils/truncate.c
 create mode 100644 obj/.gitignore

diff --git a/TODO b/TODO
index 08aaddf..82c586b 100644
--- a/TODO
+++ b/TODO
@@ -10,7 +10,6 @@ nice
 renice
 nohup
 split
-truncate
 date
 tee
 tr
@@ -22,10 +21,9 @@ dd
 stty
 stat
 sort
-printf
 test
-install
-dmesg
+tar
+chgrp
 
 Other:
  kill
@@ -41,6 +39,7 @@ Other:
  dhcp-client
  getopt
  fdisk
+ ntpd
 
 Loginutils:
  su
@@ -62,3 +61,9 @@ Findutils:
 
 Shell:
  lsh - lavash
+
+Init:
+ sinit - Simple init
+
+Libs:
+ readline
diff --git a/coreutils/chown.c b/coreutils/chown.c
index 41c7cf8..0511ecf 100644
--- a/coreutils/chown.c
+++ b/coreutils/chown.c
@@ -16,25 +16,12 @@ long gid;
 long uid;
 
 int change(const char *file) {
-	struct stat old_file;
-	if (get_stat("chown", file, &old_file))
+	if (chown_func(file, uid, gid)) {
+		fprintf(stderr, "chown: unable to chown %s: %s\n", file, strerror(errno));
 		return 1;
-
-	if (chown_func(file, uid, gid) == 0) {
-		struct stat new_file;
-		if (get_stat("chown", file, &new_file))
-			return 1;
-
-		if (old_file.st_gid != new_file.st_gid || old_file.st_uid != new_file.st_uid)
-			return 0;
-
-		fprintf(stderr, "chown: %s unchanged\n", file);
 	}
 
-	else
-		fprintf(stderr, "chown: unable to chown %s: %s\n", file, strerror(errno));
-
-	return 1;
+	return 0;
 }
 
 int cntree(const char *dst) {
diff --git a/coreutils/rm.c b/coreutils/rm.c
index e2e2905..d29590e 100644
--- a/coreutils/rm.c
+++ b/coreutils/rm.c
@@ -65,7 +65,7 @@ int main(const int argc, char **argv) {
 			f_flag = 1;
 
 		else if (!strcmp(argv[i], "--help")) {
-			printf("rm [-f force] [src1 src2...]\n");
+			printf("rm [-f force] file1 file2...\n");
 			return 0;
 		}
 	}
diff --git a/coreutils/shred.c b/coreutils/shred.c
index 59d45f9..a45ebf6 100644
--- a/coreutils/shred.c
+++ b/coreutils/shred.c
@@ -83,6 +83,7 @@ int main(const int argc, const char **argv) {
 		}
 
 		shred(rand_fd, fd);
+		fsync(fd);
 		close(fd);
 
 		if (u_flag)
diff --git a/coreutils/touch.c b/coreutils/touch.c
index b18b2f2..b636f9f 100644
--- a/coreutils/touch.c
+++ b/coreutils/touch.c
@@ -1,7 +1,6 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <utime.h>
-
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
diff --git a/coreutils/truncate.c b/coreutils/truncate.c
new file mode 100644
index 0000000..3eee63a
--- /dev/null
+++ b/coreutils/truncate.c
@@ -0,0 +1,47 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(const int argc, const char **argv) {
+	unsigned int c_flag = 0;
+	unsigned int s_size = 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 (!strcmp(argv[i], "-c"))
+			c_flag = 1;
+
+		else if (!strcmp(argv[i], "--help")) {
+			printf("truncate [-c Do not create files] [-s=SIZE] file1 file2...\n");
+			return 0;
+		}
+	}
+
+	int flags = O_WRONLY | O_NONBLOCK;
+	if (!c_flag)
+		flags |= O_CREAT;
+
+	int fd = open(argv[i], flags, 0666);
+	if (fd < 0) {
+		fprintf(stderr, "truncate %s %s\n", argv[i], strerror(errno));
+		return 1;
+	}
+
+	if (ftruncate(fd, s_size) == -1) {
+		close(fd);
+		fprintf(stderr, "truncate %s %s\n", argv[i], strerror(errno));
+		return 1;
+	}
+
+	close(fd);
+	return 0;
+}
diff --git a/obj/.gitignore b/obj/.gitignore
new file mode 100644
index 0000000..e69de29