ref: cb5b36f7c62545b92bbe577175de82c6c6cc9be9
dir: /sys/src/ape/cmd/basename.c/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
void
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);
}