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[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * bb_simplify_path implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2001 Manuel Novoa III <mjn3@codepoet.org>
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| 6 | *
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[1765] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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[821] | 8 | */
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| 9 |
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| 10 | #include "libbb.h"
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| 11 |
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| 12 | char *bb_simplify_path(const char *path)
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| 13 | {
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| 14 | char *s, *start, *p;
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| 15 |
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| 16 | if (path[0] == '/')
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[1765] | 17 | start = xstrdup(path);
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[821] | 18 | else {
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[1765] | 19 | s = xrealloc_getcwd_or_warn(NULL);
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[821] | 20 | start = concat_path_file(s, path);
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| 21 | free(s);
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| 22 | }
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| 23 | p = s = start;
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| 24 |
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| 25 | do {
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| 26 | if (*p == '/') {
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| 27 | if (*s == '/') { /* skip duplicate (or initial) slash */
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| 28 | continue;
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[1765] | 29 | }
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| 30 | if (*s == '.') {
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| 31 | if (s[1] == '/' || !s[1]) { /* remove extra '.' */
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[821] | 32 | continue;
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[1765] | 33 | }
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| 34 | if ((s[1] == '.') && (s[2] == '/' || !s[2])) {
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[821] | 35 | ++s;
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| 36 | if (p > start) {
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[1765] | 37 | while (*--p != '/') /* omit previous dir */
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| 38 | continue;
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[821] | 39 | }
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| 40 | continue;
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| 41 | }
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| 42 | }
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| 43 | }
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| 44 | *++p = *s;
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| 45 | } while (*++s);
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| 46 |
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| 47 | if ((p == start) || (*p != '/')) { /* not a trailing slash */
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| 48 | ++p; /* so keep last character */
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| 49 | }
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| 50 | *p = 0;
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| 51 |
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| 52 | return start;
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| 53 | }
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