Import sources from 2011-03-30 iso image

sys/src/ape/cmd/basename.c

@@ -0,0 +1,44 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+main(int argc, char **argv)
+{
+	char *f, *b, *s;
+	int n;
+
+	if(argc < 2 || argc > 3){
+		fprintf(stderr, "Usage: basename string [suffix]\n");
+		exit(1);
+	}
+	s = argv[1];
+	b = s + strlen(s) - 1;
+	while(b > s && *b == '/')
+		b--;
+	*++b = 0;
+	if(b == s+1 && s[0] == '/') {
+		printf("/");
+		exit(0);
+	}
+	/* now b is after last char of string, trailing slashes removed */
+
+	for(f = b; f >= s; f--)
+		if(*f == '/'){
+			f++;
+			break;
+		}
+	if(f < s)
+		f = s;
+
+	/* now f is first char after last remaining slash, or first char */
+
+	if(argc == 3){
+		n = strlen(argv[2]);
+		if(n < b-f && strncmp(b-n, argv[2], n) == 0){
+			b -= n;
+			*b = 0;
+		}
+	}
+	printf("%s\n", f);
+	exit(0);
+}