revpath.c revision bb2e14f3 
1/*
2 * Copyright 1999 by The XFree86 Project, Inc.
3 */
4/* $XFree86: xc/config/util/revpath.c,v 1.2 1999/02/01 11:55:49 dawes Exp $ */
5
6/*
7 * Reverse a pathname.  It returns a relative path that can be used to undo
8 * 'cd argv[1]'.
9 *
10 * It is impossible to do this in general, but this handles the cases that
11 * come up in imake.  Maybe imake should use an absolute path for $(TOP)
12 * instead of a relative path so that this problem can be avoided?
13 */
14
15#include <stdio.h>
16#include <string.h>
17#include <stdlib.h>
18
19int
20main(int argc, char *argv[])
21{
22    int levels = 0;
23    char *p;
24
25    /* Silently ignore invalid usage */
26    if (argc != 2)
27	exit(0);
28
29    /* Split the path and count the levels */
30    p = strtok(argv[1], "/");
31    while (p) {
32	if (strcmp(p, ".") == 0)
33	    ;
34	else if (strcmp(p, "..") == 0)
35	    levels--;
36	else
37	    levels++;
38	p = strtok(NULL, "/");
39    }
40
41    while (levels-- > 0)
42	printf("../");
43
44    printf("\n");
45
46    exit(0);
47}
48