From 0c3ec12ca530d73203590da784ecc484c5f02036 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Mon, 6 Nov 2023 18:32:22 +0300
Subject: [PATCH] chgrp

---
 TODO                   |   2 -
 coreutils/chgrp.c      | 113 +++++++++++++++++++++++++++++++++++++++++
 coreutils/chmod.c      |   5 +-
 coreutils/tee.c        |   6 +++
 coreutils/truncate.c   |   5 ++
 miscutils/getloadavg.c |  13 -----
 6 files changed, 128 insertions(+), 16 deletions(-)
 create mode 100644 coreutils/chgrp.c
 create mode 100644 coreutils/tee.c
 delete mode 100644 miscutils/getloadavg.c

diff --git a/TODO b/TODO
index 82c586b..f703c37 100644
--- a/TODO
+++ b/TODO
@@ -11,7 +11,6 @@ renice
 nohup
 split
 date
-tee
 tr
 cut
 shuf
@@ -23,7 +22,6 @@ stat
 sort
 test
 tar
-chgrp
 
 Other:
  kill
diff --git a/coreutils/chgrp.c b/coreutils/chgrp.c
new file mode 100644
index 0000000..35ea83b
--- /dev/null
+++ b/coreutils/chgrp.c
@@ -0,0 +1,113 @@
+#include <grp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include "make_path.h"
+#include "get_stat.h"
+
+int (*get_stat)(const char *prog_name, const char *path, struct stat *stat_path);
+unsigned int r_flag;
+unsigned int s_flag;
+struct group *grp;
+
+int change(const char *file) {
+	struct stat stat_path;
+	if (mu_get_stat("chgrp", file, &stat_path))
+		return 1;
+
+	if (lchown(file, stat_path.st_uid, grp->gr_gid)) {
+		if (!s_flag)
+			fprintf(stderr, "chgrp: %s: %s\n", file, strerror(errno));
+
+		return 1;
+	}
+
+	return 0;
+}
+
+int chtree(const char *dst) {
+	int ret = change(dst);
+
+	struct stat stat_path;
+	if (get_stat("chgrp", dst, &stat_path))
+		return 1;
+
+	if (!S_ISDIR(stat_path.st_mode) || !r_flag)
+		return ret;
+
+	DIR *dir = opendir(dst);
+	if (dir == NULL) {
+		if (!s_flag)
+			fprintf(stderr, "chgrp: %s: Can`t open directory\n", dst);
+
+		return 1;
+	}
+
+	struct dirent *ep;
+	while ((ep = readdir(dir)) != NULL) {
+		if (!strcmp(ep->d_name, ".") || !strcmp(ep->d_name, ".."))
+			continue;
+
+		char *full_path = mu_make_path("chgrp", dst, ep->d_name);
+		if (full_path == NULL)
+			continue;
+
+		if (chtree(full_path))
+			ret = 1;
+
+		free(full_path);
+	}
+
+	closedir(dir);
+	return ret;
+}
+
+int main(int argc, char **argv) {
+	int i;
+
+	get_stat = mu_get_lstat;
+	for (i = 1; i < argc; i++) {
+		if (argv[i][0] != '-')
+			break;
+
+		else if (!strcmp(argv[i], "-r"))
+			r_flag = 1;
+
+		else if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "-f"))
+			s_flag = 1;
+
+		else if (!strcmp(argv[i], "-H"))
+			get_stat = mu_get_stat;
+
+		else if (!strcmp(argv[i], "--help")) {
+			printf("chgrp [-H if a command line argument is a symbolic link] [-r recursive] [-s silent] [group] [file1 file2...]\n");
+			return 0;
+		}
+	}
+
+	if (argc - i < 2) {
+		fprintf(stderr, "chgrp: missing operand\n");
+		return 1;
+	}
+
+	grp = getgrnam(argv[i]);
+	if (!grp) {
+		fprintf(stderr, "chgrp: unknow group\n");
+		return 1;
+	}
+
+	argv++;
+	argc--;
+
+	int ret = 0;
+	for (; i < argc; i++)
+		if (chtree(argv[i]))
+			ret = 1;
+
+	return ret;
+}
+
+
diff --git a/coreutils/chmod.c b/coreutils/chmod.c
index d45f3da..ed4cc50 100644
--- a/coreutils/chmod.c
+++ b/coreutils/chmod.c
@@ -19,7 +19,9 @@ int change(const char *file, const char *mode_arg) {
 
 	mode_t mode = mu_parse_mode(mode_arg, old_file.st_mode);
 	if (chmod(file, mode) != 0) {
-		fprintf(stderr, "chmod: unable to chown %s: %s\n", file, strerror(errno));
+		if (!s_flag)
+			fprintf(stderr, "chmod: unable to chown %s: %s\n", file, strerror(errno));
+
 		return 1;
 	}
 
@@ -40,6 +42,7 @@ int chtree(const char *dst, const char *mode_arg) {
 	if (dir == NULL) {
 		if (!s_flag)
 			fprintf(stderr, "chown: %s: Can`t open directory\n", dst);
+
 		return 1;
 	}
 
diff --git a/coreutils/tee.c b/coreutils/tee.c
new file mode 100644
index 0000000..fb11188
--- /dev/null
+++ b/coreutils/tee.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main(const int argc, const char **argv) {
+
+	return 0;
+}
diff --git a/coreutils/truncate.c b/coreutils/truncate.c
index 3eee63a..f17172f 100644
--- a/coreutils/truncate.c
+++ b/coreutils/truncate.c
@@ -26,6 +26,11 @@ int main(const int argc, const char **argv) {
 		}
 	}
 
+	if (argc - i == 0) {
+		fprintf(stderr, "truncate: missing operand\n");
+		return 1;
+	}
+
 	int flags = O_WRONLY | O_NONBLOCK;
 	if (!c_flag)
 		flags |= O_CREAT;
diff --git a/miscutils/getloadavg.c b/miscutils/getloadavg.c
deleted file mode 100644
index 0569f5f..0000000
--- a/miscutils/getloadavg.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-int main(void) {
-	double avg[3] = {0, 0, 0};
-
-	if (getloadavg(avg, sizeof(avg) / sizeof(avg[0])) < 0) {
-		fprintf(stderr, "getloadavg: getloadavg() failed\n");
-		return 1;
-	}
-
-	printf("%.2f %.2f %.2f\n", avg[0], avg[1], avg[2]);
-}