add chown

Makefile

@@ -1,8 +1,8 @@
 include config.mk
 
-LIB = util/enmasse.o util/eprintf.o
-SRC = basename.c cat.c date.c dirname.c echo.c false.c grep.c ln.c pwd.c rm.c \
-      sleep.c tee.c touch.c true.c wc.c
+LIB = util/enmasse.o util/eprintf.o util/recurse.o
+SRC = basename.c cat.c chown.c date.c dirname.c echo.c false.c grep.c ln.c \
+      pwd.c rm.c sleep.c tee.c touch.c true.c wc.c
 OBJ = $(SRC:.c=.o) $(LIB)
 BIN = $(SRC:.c=)
 MAN = $(SRC:.c=.1)

chown.1

@@ -0,0 +1,15 @@
+.TH CHOWN 1 sbase\-VERSION
+.SH NAME
+chown \- change file ownership
+.SH SYNOPSIS
+.B chown
+.RB [ -Rr ]
+.RI [ owner ][: group ]
+.RI [ files ...]
+.SH DESCRIPTION
+.B chown
+changes the user or group ownership for the given files.
+.SH OPTIONS
+.TP
+.B -R, -r
+change directory ownership recursively.

chown.c

@@ -0,0 +1,66 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "util.h"
+
+static void chownpwgr(const char *);
+
+static bool rflag = false;
+static struct passwd *pw = NULL;
+static struct group *gr = NULL;
+
+int
+main(int argc, char *argv[])
+{
+	char c, *owner, *group;
+
+	while((c = getopt(argc, argv, "Rr")) != -1)
+		switch(c) {
+		case 'R':
+		case 'r':
+			rflag = true;
+			break;
+		default:
+			exit(EXIT_FAILURE);
+		}
+	if(optind == argc)
+		eprintf("usage: %s [-Rr] [owner][:group] [file...]\n", argv[0]);
+	owner = argv[optind++];
+	if((group = strchr(owner, ':')))
+		*group++ = '\0';
+
+	if(owner && *owner) {
+		errno = 0;
+		pw = getpwnam(owner);
+		if(errno != 0)
+			eprintf("getpwnam %s:", owner);
+		else if(!pw)
+			eprintf("getpwnam %s: no such user\n", owner);
+	}
+	if(group && *group) {
+		errno = 0;
+		gr = getgrnam(group);
+		if(errno != 0)
+			eprintf("getgrnam %s:", group);
+		else if(!gr)
+			eprintf("getgrnam %s: no such user\n", group);
+	}
+	for(; optind < argc; optind++)
+		chownpwgr(argv[optind]);
+	return EXIT_SUCCESS;
+}
+
+void
+chownpwgr(const char *path)
+{
+	if(chown(path, pw ? pw->pw_uid : -1, gr ? gr->gr_gid : -1) != 0)
+		eprintf("chown %s:", path);
+	if(rflag)
+		recurse(path, chownpwgr);
+}

rm.c

@@ -1,10 +1,7 @@
 /* See LICENSE file for copyright and license details. */
-#include <dirent.h>
-#include <errno.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <unistd.h>
 #include "util.h"
 
@@ -34,36 +31,11 @@ main(int argc, char *argv[])
 	return EXIT_SUCCESS;
 }
 
-void rm(const char *path)
+void
+rm(const char *path)
 {
-	if(remove(path) == 0)
-		return;
-	if(errno == ENOTEMPTY && rflag) {
-		char *buf;
-		long size;
-		struct dirent *d;
-		DIR *dp;
-
-		if((size = pathconf(".", _PC_PATH_MAX)) < 0)
-			size = BUFSIZ;
-		if(!(buf = malloc(size)))
-			eprintf("malloc:");
-		if(!getcwd(buf, size))
-			eprintf("getcwd:");
-		if(!(dp = opendir(path)))
-			eprintf("opendir %s:", path);
-		if(chdir(path) != 0)
-			eprintf("chdir %s:", path);
-		while((d = readdir(dp)))
-			if(strcmp(d->d_name, ".") && strcmp(d->d_name, ".."))
-				rm(d->d_name);
-
-		closedir(dp);
-		if(chdir(buf) != 0)
-			eprintf("chdir %s:", buf);
-		if(remove(path) == 0)
-			return;
-	}
-	if(!fflag)
+	if(rflag)
+		recurse(path, rm);
+	if(remove(path) != 0 && !fflag)
 		eprintf("remove %s:", path);
 }

util.h

@@ -2,3 +2,4 @@
 
 void enmasse(int, char **, int (*)(const char *, const char *));
 void eprintf(const char *, ...);
+void recurse(const char *, void (*)(const char *));

util/recurse.c

@@ -0,0 +1,40 @@
+/* See LICENSE file for copyright and license details. */
+#include <dirent.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "../util.h"
+
+void
+recurse(const char *path, void (*fn)(const char *))
+{
+	char *buf;
+	long size;
+	struct dirent *d;
+	DIR *dp;
+
+	if(!(dp = opendir(path))) {
+		if(errno == ENOTDIR)
+			return;
+		else
+			eprintf("opendir %s:", path);
+	}
+	if((size = pathconf(".", _PC_PATH_MAX)) < 0)
+		size = BUFSIZ;
+	if(!(buf = malloc(size)))
+		eprintf("malloc:");
+	if(!getcwd(buf, size))
+		eprintf("getcwd:");
+	if(chdir(path) != 0)
+		eprintf("chdir %s:", path);
+	while((d = readdir(dp)))
+		if(strcmp(d->d_name, ".") && strcmp(d->d_name, ".."))
+			fn(d->d_name);
+
+	closedir(dp);
+	if(chdir(buf) != 0)
+		eprintf("chdir %s:", buf);
+	free(buf);
+}