Add suffix stripping support to basename

-Erik

Changelog

@@ -15,15 +15,17 @@
 		does force anyway
 	    * tail can now accept -<num> commands (e.g. -10) for better 
 		compatibility with the standard tail command
-	    * added a simple id implementation; doesn't support supp. groups yet
+	    * added a simple id implementation; doesn't support sup. groups yet
-	* logname used getlogin(3) which uses utmp under the hood.  Now it behaves. 
+	* logname used getlogin(3) which uses utmp.  Now it doesn't. 
 	* whoami used getpwuid(3) which uses libc NSS.  Now it behaves. 
-	* Due to the license change, I can now use minix code.  Minux tr replaces
+	* Due to the license change, I can now use minix code.  Minux tr 
-	    the BSD derived tr, saving 4k and eliminating bsearch(3) from the
+	    replaces the BSD derived tr, saving 4k and eliminating bsearch(3) 
-	    list of used Libc symbols.
+	    from the list of used Libc symbols.
 	* Add support for "noatime" and "nodiratime" mount flags to mount.
 	* Changed 'umount -f' to mean force, and actually use umount2.
 	* Changed 'umount -l' to mean "Do not free loop device".
+	* Fixed basename to support stripping of suffixes.  Patch thanks
+	    to xiong jianxin <jxiong@uiuc.edu>
 	* More doc updates
 
 	 -Erik

basename.c

@@ -26,12 +26,14 @@
 
 extern int basename_main(int argc, char **argv)
 {
-	char* s, *s1;
+	int m, n;
+	char *s, *s1;
 
 	if ((argc < 2) || (**(argv + 1) == '-')) {
-		usage("basename [FILE ...]\n"
+		usage("basename FILE [SUFFIX]\n"
 #ifndef BB_FEATURE_TRIVIAL_HELP
-				"\nStrips directory path and suffixes from FILE(s).\n"
+				"\nStrips directory path and suffixes from FILE.\n"
+				"If specified, also removes any trailing SUFFIX.\n"
 #endif
 				);
 	}
@@ -40,10 +42,20 @@ extern int basename_main(int argc, char **argv)
 	s1=*argv+strlen(*argv)-1;
 	while (s1 && *s1 == '/') {
 		*s1 = '\0';
-		s1=*argv+strlen(*argv)-1;
+		s1--;
 	}
 	s = strrchr(*argv, '/');
-	printf("%s\n", (s)? s + 1 : *argv);
+	if (s==NULL) s=*argv;
+	else s++;
+
+	if (argc>2) {
+		argv++;
+		n = strlen(*argv);
+		m = strlen(s);
+		if (m>=n && strncmp(s+m-n, *argv, n)==0)
+			s[m-n] = '\0';
+	}
+	printf("%s\n", s);
 	exit(TRUE);
 }
 

coreutils/basename.c

@@ -26,12 +26,14 @@
 
 extern int basename_main(int argc, char **argv)
 {
-	char* s, *s1;
+	int m, n;
+	char *s, *s1;
 
 	if ((argc < 2) || (**(argv + 1) == '-')) {
-		usage("basename [FILE ...]\n"
+		usage("basename FILE [SUFFIX]\n"
 #ifndef BB_FEATURE_TRIVIAL_HELP
-				"\nStrips directory path and suffixes from FILE(s).\n"
+				"\nStrips directory path and suffixes from FILE.\n"
+				"If specified, also removes any trailing SUFFIX.\n"
 #endif
 				);
 	}
@@ -40,10 +42,20 @@ extern int basename_main(int argc, char **argv)
 	s1=*argv+strlen(*argv)-1;
 	while (s1 && *s1 == '/') {
 		*s1 = '\0';
-		s1=*argv+strlen(*argv)-1;
+		s1--;
 	}
 	s = strrchr(*argv, '/');
-	printf("%s\n", (s)? s + 1 : *argv);
+	if (s==NULL) s=*argv;
+	else s++;
+
+	if (argc>2) {
+		argv++;
+		n = strlen(*argv);
+		m = strlen(s);
+		if (m>=n && strncmp(s+m-n, *argv, n)==0)
+			s[m-n] = '\0';
+	}
+	printf("%s\n", s);
 	exit(TRUE);
 }
 

docs/busybox.pod

@@ -71,9 +71,10 @@ uname, uniq, update, uptime, usleep, wc, whoami, yes, zcat, [
 
 =item basename
 
-Usage: basename [file ...]
+Usage: basename FILE [SUFFIX]
 
-Strips directory path and suffixes from FILE(s). 
+Strips directory path and suffixes from FILE.
+If specified, also removes any trailing SUFFIX.
 
 Example: 
 
@@ -81,6 +82,8 @@ Example:
 	foo
 	$ basename /usr/local/bin/
 	bin
+	$ basename /foo/bar.txt .txt
+	bar
 
 -------------------------------
 
@@ -1878,4 +1881,4 @@ Enrique Zanardi <ezanardi@ull.es>
 
 =cut
 
-# $Id: busybox.pod,v 1.28 2000/05/05 19:49:33 erik Exp $
+# $Id: busybox.pod,v 1.29 2000/05/10 05:00:31 erik Exp $