From 6666ac42a5cd63a8b18ec72f6c1364f31ef53921 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko
Date: Fri, 24 Aug 2007 21:46:24 +0000
Subject: cp,mv: simpler arg[cv] handling -> smallish code savings

---
 coreutils/cp.c      | 30 ++++++++++++++++--------------
 coreutils/install.c |  6 ++++--
 coreutils/mv.c      | 37 +++++++++++++++++++------------------
 3 files changed, 39 insertions(+), 34 deletions(-)

(limited to 'coreutils')

diff --git a/coreutils/cp.c b/coreutils/cp.c
index 884fbf7..5b57581 100644
--- a/coreutils/cp.c
+++ b/coreutils/cp.c
@@ -40,12 +40,16 @@ int cp_main(int argc, char **argv)
 		OPT_L = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+3),
 	};
 
+	// Need at least two arguments
 	// Soft- and hardlinking don't mix
 	// -P and -d are the same (-P is POSIX, -d is GNU)
 	// -r and -R are the same
 	// -a = -pdR
-	opt_complementary = "l--s:s--l:Pd:rR:apdR";
+	opt_complementary = "-2:l--s:s--l:Pd:rR:apdR";
 	flags = getopt32(argv, FILEUTILS_CP_OPTSTR "arPHL");
+	argc -= optind;
+	argv += optind;
+	flags ^= FILEUTILS_DEREFERENCE;		/* The sense of this flag was reversed. */
 	/* Default behavior of cp is to dereference, so we don't have to do
 	 * anything special when we are given -L.
 	 * The behavior of -H is *almost* like -L, but not quite, so let's
@@ -60,19 +64,12 @@ int cp_main(int argc, char **argv)
 	}
 #endif
 
-	flags ^= FILEUTILS_DEREFERENCE;		/* The sense of this flag was reversed. */
-
-	if (optind + 2 > argc) {
-		bb_show_usage();
-	}
-
 	last = argv[argc - 1];
-	argv += optind;
-
 	/* If there are only two arguments and...  */
-	if (optind + 2 == argc) {
+	if (argc == 2) {
 		s_flags = cp_mv_stat2(*argv, &source_stat,
 				      (flags & FILEUTILS_DEREFERENCE) ? stat : lstat);
+		/* TODO: does coreutils cp exit? "cp BAD GOOD dir"... */
 		if (s_flags < 0)
 			return EXIT_FAILURE;
 		d_flags = cp_mv_stat(last, &dest_stat);
@@ -85,19 +82,24 @@ int cp_main(int argc, char **argv)
 			((flags & FILEUTILS_RECUR) && (s_flags & 2) && !d_flags)
 		) {
 			/* ...do a simple copy.  */
-			dest = xstrdup(last);
-			goto DO_COPY; /* Note: optind+2==argc implies argv[1]==last below. */
+			dest = last;
+			goto DO_COPY; /* NB: argc==2 -> *++argv==last */
 		}
 	}
 
-	do {
+	while (1) {
 		dest = concat_path_file(last, bb_get_last_path_component(*argv));
  DO_COPY:
 		if (copy_file(*argv, dest, flags) < 0) {
 			status = 1;
 		}
+		if (*++argv == last) {
+			/* possibly leaking dest... */
+			break;
+		}
 		free((void*)dest);
-	} while (*++argv != last);
+	}
 
+	/* Exit. We are NOEXEC, not NOFORK. We do exit at the end of main() */
 	return status;
 }
diff --git a/coreutils/install.c b/coreutils/install.c
index cf62a00..d087306 100644
--- a/coreutils/install.c
+++ b/coreutils/install.c
@@ -123,10 +123,12 @@ int install_main(int argc, char **argv)
 		copy_flags |= FILEUTILS_PRESERVE_STATUS;
 	}
 	mode = 0666;
-	if (flags & OPT_MODE) bb_parse_mode(mode_str, &mode);
+	if (flags & OPT_MODE)
+		bb_parse_mode(mode_str, &mode);
 	uid = (flags & OPT_OWNER) ? get_ug_id(uid_str, xuname2uid) : getuid();
 	gid = (flags & OPT_GROUP) ? get_ug_id(gid_str, xgroup2gid) : getgid();
-	if (flags & (OPT_OWNER|OPT_GROUP)) umask(0);
+	if (flags & (OPT_OWNER|OPT_GROUP))
+		umask(0);
 
 	/* Create directories
 	 * don't use bb_make_directory() as it can't change uid or gid
diff --git a/coreutils/mv.c b/coreutils/mv.c
index 553bb6e..1d29770 100644
--- a/coreutils/mv.c
+++ b/coreutils/mv.c
@@ -47,16 +47,15 @@ int mv_main(int argc, char **argv)
 #if ENABLE_FEATURE_MV_LONG_OPTIONS
 	applet_long_options = mv_longopts;
 #endif
-	opt_complementary = "f-i:i-f";
+	// Need at least two arguments
+	// -f unsets -i, -i unsets -f
+	opt_complementary = "-2:f-i:i-f";
 	flags = getopt32(argv, "fi");
-	if (optind + 2 > argc) {
-		bb_show_usage();
-	}
-
-	last = argv[argc - 1];
+	argc -= optind;
 	argv += optind;
+	last = argv[argc - 1];
 
-	if (optind + 2 == argc) {
+	if (argc == 2) {
 		dest_exists = cp_mv_stat(last, &dest_stat);
 		if (dest_exists < 0) {
 			return 1;
@@ -75,11 +74,11 @@ int mv_main(int argc, char **argv)
 			goto RET_1;
 		}
 
-DO_MOVE:
-
-		if (dest_exists && !(flags & OPT_FILEUTILS_FORCE) &&
-			((access(dest, W_OK) < 0 && isatty(0)) ||
-			(flags & OPT_FILEUTILS_INTERACTIVE))) {
+ DO_MOVE:
+		if (dest_exists && !(flags & OPT_FILEUTILS_FORCE)
+		 && ((access(dest, W_OK) < 0 && isatty(0))
+		    || (flags & OPT_FILEUTILS_INTERACTIVE))
+		) {
 			if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
 				goto RET_1;	/* Ouch! fprintf failed! */
 			}
@@ -91,8 +90,9 @@ DO_MOVE:
 			struct stat source_stat;
 			int source_exists;
 
-			if (errno != EXDEV ||
-				(source_exists = cp_mv_stat(*argv, &source_stat)) < 1) {
+			if (errno != EXDEV
+			 || (source_exists = cp_mv_stat(*argv, &source_stat)) < 1
+			) {
 				bb_perror_msg("cannot rename '%s'", *argv);
 			} else {
 				if (dest_exists) {
@@ -116,15 +116,16 @@ DO_MOVE:
 #if ENABLE_SELINUX
 				copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 #endif
-				if ((copy_file(*argv, dest, copy_flag) >= 0) &&
-					(remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)) {
+				if ((copy_file(*argv, dest, copy_flag) >= 0)
+				 && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
+				) {
 					goto RET_0;
 				}
 			}
-RET_1:
+ RET_1:
 			status = 1;
 		}
-RET_0:
+ RET_0:
 		if (dest != last) {
 			free((void *) dest);
 		}
-- 
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