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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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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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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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17 | start = xstrdup(path);
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18 | else {
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19 | s = xrealloc_getcwd_or_warn(NULL);
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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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29 | }
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30 | if (*s == '.') {
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31 | if (s[1] == '/' || !s[1]) { /* remove extra '.' */
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32 | continue;
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33 | }
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34 | if ((s[1] == '.') && (s[2] == '/' || !s[2])) {
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35 | ++s;
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36 | if (p > start) {
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37 | while (*--p != '/') /* omit previous dir */
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38 | continue;
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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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