Adding ARGBEGIN for basename.

Makefile

@@ -1,6 +1,6 @@
 include config.mk
 
-HDR = fs.h text.h util.h
+HDR = fs.h text.h util.h arg.h
 LIB = \
 	util/afgets.o    \
 	util/agetcwd.o   \

arg.h

@@ -0,0 +1,31 @@
+extern char *argv0;
+
+#define USED(x) ((void)(x))
+
+#define ARGBEGIN	for (argv0 = *argv, argv++, argc--;\
+					argv[0] && argv[0][1]\
+					&& argv[0][0] == '-';\
+					argc--, argv++) {\
+				char _argc;\
+				char **_argv;\
+				if (argv[0][1] == '-' && argv[0][2] == '\0') {\
+					argv++;\
+					argc--;\
+					break;\
+				}\
+				for (argv[0]++, _argv = argv; argv[0][0];\
+						argv[0]++) {\
+					if (_argv != argv)\
+						break;\
+					_argc = argv[0][0];\
+					switch (_argc)
+
+#define ARGEND			}\
+				USED(_argc);\
+			}\
+			USED(argv);\
+			USED(argc);
+
+#define EARGF(x)	((argv[1] == NULL)? ((x), abort(), (char *)0) :\
+			(argc--, argv++, argv[0]))
+

basename.1

@@ -3,6 +3,10 @@
 basename \- strip leading path component
 .SH SYNOPSIS
 .B basename
+.RB [ \-a ]
+.RB [ \-z ]
+.RB [ \-s
+.IR suffix ]
 .I string
 .RI [ suffix ]
 .SH DESCRIPTION
@@ -12,6 +16,17 @@ prints the
 with any leading path components, and the
 .IR suffix ,
 removed.
+.SH OPTIONS
+.TP
+.BI \-a
+multiple arguments will each be treated as strings
+.TP
+.BI \-s " suffix"
+specifies the suffix that should be removed
+.TP
+.BI \-z
+output will be separated with NUL
+.TP
 .SH SEE ALSO
 .IR dirname (1),
 .IR basename (3)

basename.c

@@ -4,25 +4,63 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <stdbool.h>
+
+#include "arg.h"
 #include "util.h"
 
+char *argv0;
+
+void
+usage(void)
+{
+	eprintf("usage: %s [-ahz] [-s suffix] name [suffix]\n",
+			basename(argv0));
+}
+
 int
 main(int argc, char *argv[])
 {
-	char *s;
-	size_t n;
+	char *s, *suffix = NULL;
+	size_t n, sn;
+	bool aflag = false, zflag = false;
 
-	if(getopt(argc, argv, "") != -1)
-		exit(EXIT_FAILURE);
-	if(optind == argc)
-		eprintf("usage: %s string [suffix]\n", argv[0]);
+	ARGBEGIN {
+	case 'a':
+		aflag = true;
+		break;
+	case 's':
+		suffix = EARGF(usage());
+		break;
+	case 'z':
+		zflag = true;
+		break;
+	case 'h':
+	default:
+		usage();
+	} ARGEND;
 
-	s = basename(argv[optind++]);
-	if(optind < argc && strlen(s) > strlen(argv[optind])) {
-		n = strlen(s) - strlen(argv[optind]);
-		if(!strcmp(&s[n], argv[optind]))
+	if (argc < 1)
+		usage();
+
+	if (!aflag && argc == 2)
+		suffix = argv[1];
+	if (suffix)
+		sn = strlen(suffix);
+
+	for (; argc > 0; argc--, argv++) {
+		s = basename(argv[0]);
+		if (suffix) {
+			n = strlen(s) - sn;
+			if (!strcmp(&s[n], suffix))
 				s[n] = '\0';
 		}
-	puts(s);
+		printf("%s%c", s, (zflag)? '\0' : '\n');
+
+		if (!aflag)
+			break;
+	}
+
 	return EXIT_SUCCESS;
 }
+