Initial release; not functional yet

src/chown.c

@@ -0,0 +1,123 @@
+/* chown.c */
+
+
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <grp.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+
+/* types */
+#define OPT_h 1
+#define OPT_R 2
+#define OPT_H 4
+#define OPT_L 8
+#define OPT_P 12
+
+
+/* chown */
+static int _chown_owner(char * owner, uid_t * uid, gid_t * gid);
+static int _chown_do(int opts, uid_t uid, gid_t gid, int argc, char * argv[]);
+static int _chown(int opts, char * owner, int argc, char * argv[])
+{
+	uid_t uid;
+	gid_t gid;
+
+	if(_chown_owner(owner, &uid, &gid) != 0)
+		return 2;
+	return _chown_do(opts, uid, gid, argc, argv);
+}
+
+/* PRE
+ * POST
+ * 		0	success
+ * 		else	failure */
+static uid_t _chown_uid(char * owner);
+static gid_t _chown_gid(char * group);
+static int _chown_owner(char * owner, uid_t * uid, gid_t * gid)
+{
+	int i;
+
+	for(i = 0; owner[i] != 0; i++)
+		if(owner[i] == ':')
+		{
+			owner[i++] = '\0';
+			break;
+		}
+	if((*uid = _chown_uid(owner)) == -1)
+		return 1;
+	if(owner[i] != '\0' && (*gid = _chown_gid(&owner[i])) == -1)
+		return 1;
+	else
+		*gid = -1;
+	return 0;
+}
+
+static uid_t _chown_uid(char * owner)
+{
+	struct passwd * pwd;
+
+	if((pwd = getpwnam(owner)) == NULL)
+		return -1;
+	return pwd->pw_uid;
+}
+
+static gid_t _chown_gid(char * group)
+{
+	struct group * gr;
+
+	if((gr = getgrnam(group)) == NULL)
+		return -1;
+	return gr->gr_gid;
+}
+
+static int _chown_do(int opts, uid_t uid, gid_t gid, int argc, char * argv[])
+{
+	return 2;
+}
+
+
+/* usage */
+static int _usage(void)
+{
+	fprintf(stderr, "%s", "Usage: chown [-hR] owner[:group] file ...\n\
+       chown -R [-H | -L | -P] owner[:group] file ...\n");
+	return 1;
+}
+
+/* main */
+int main(int argc, char * argv[])
+{
+	int o;
+	int opts = 0;
+
+	while((o = getopt(argc, argv, "hRHLP")) != -1)
+	{
+		switch(o)
+		{
+			case 'h':
+				opts |= OPT_h;
+				break;
+			case 'R':
+				opts |= OPT_R;
+				break;
+			case 'H':
+			case 'L':
+			case 'P':
+				fprintf(stderr, "%s%c%s", "chown: -", o,
+						": Not yet implemented\n");
+			default:
+				return _usage();
+		}
+	}
+	if(argc - optind < 2)
+		return _usage();
+	return _chown(opts, argv[optind], argc - optind - 1, &argv[optind+1]);
+}