From daefcd94fcd5eeed4fe4c679578dc7d6876a50a0 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Fri, 27 Oct 2023 19:55:18 +0300
Subject: [PATCH] chown test

---
 coreutils/chown.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 coreutils/chown.c

diff --git a/coreutils/chown.c b/coreutils/chown.c
new file mode 100644
index 0000000..a317a62
--- /dev/null
+++ b/coreutils/chown.c
@@ -0,0 +1,96 @@
+//TODO
+
+#include <pwd.h>
+#include <grp.h>
+#include <stdio.h>
+#include <errno.h>
+#include <dirent.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+int (*chown_func)(const char *pathname, uid_t owner, gid_t group);
+long gid;
+long uid;
+
+int cntree(const char *dst) {
+	if (chown_func(dst, uid, gid) == 0)
+		puts("changed");
+
+	return 0;
+}
+
+void get_owner(const char *arg) {
+	char *group = strchr(arg, ':');
+
+	unsigned int g_flag = 1;
+	unsigned int u_flag = 1;
+	if (group == arg)
+		u_flag = 0;
+
+	else if (!group)
+		g_flag = 0;
+
+	if (g_flag) {
+		group[0] = '\0';
+		group++;
+
+		struct group *grp = getgrnam(group);
+		if (!grp) {
+			fprintf(stderr, "chown: invalid group: %s\n", group);
+			exit(1);
+		}
+
+		gid = grp->gr_gid;
+	}
+
+	if (u_flag) {
+		struct passwd *pwd = getpwnam(arg);
+		if (!pwd) {
+			fprintf(stderr, "chown: invalid user: %s\n", arg);
+			exit(1);
+		}
+
+		uid = pwd->pw_gid;
+	}
+}
+
+int main(const int argc, char **argv) {
+	chown_func = lchown;
+
+	int i;
+	for (i = 1; i < argc; i++) {
+		if (argv[i][0] != '-')
+			break;
+
+		else if (!strcmp(argv[i], "-H"))
+			chown_func = chown;
+
+		else if (!strcmp(argv[i], "--help")) {
+			printf("chown [-H (if a command line argument is a symbolic link)] [owner]:[group] [file file2...]\n");
+			return 0;
+		}
+	}
+
+	if (argc - i == 0) {
+		fprintf(stderr, "chown: missing operand\n");
+		return 1;
+	}
+
+	gid = -1;
+	uid = -1;
+	get_owner(argv[i++]);
+
+	if (argc - i == 0) {
+		fprintf(stderr, "chown: missing operand\n");
+		return 1;
+	}
+
+	int ret = 0;
+	for (; i < argc; i++)
+		if (cntree(argv[i]))
+			ret = 1;
+
+	return ret;
+}