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 | * This program is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * This program is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 | * General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 | *
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21 | */
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22 |
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23 | #include <stdlib.h>
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24 | #include "libbb.h"
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25 |
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26 | char *bb_simplify_path(const char *path)
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27 | {
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28 | char *s, *start, *p;
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29 |
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30 | if (path[0] == '/')
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31 | start = bb_xstrdup(path);
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32 | else {
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33 | s = xgetcwd(NULL);
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34 | start = concat_path_file(s, path);
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35 | free(s);
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36 | }
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37 | p = s = start;
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38 |
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39 | do {
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40 | if (*p == '/') {
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41 | if (*s == '/') { /* skip duplicate (or initial) slash */
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42 | continue;
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43 | } else if (*s == '.') {
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44 | if (s[1] == '/' || s[1] == 0) { /* remove extra '.' */
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45 | continue;
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46 | } else if ((s[1] == '.') && (s[2] == '/' || s[2] == 0)) {
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47 | ++s;
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48 | if (p > start) {
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49 | while (*--p != '/'); /* omit previous dir */
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50 | }
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51 | continue;
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52 | }
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53 | }
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54 | }
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55 | *++p = *s;
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56 | } while (*++s);
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57 |
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58 | if ((p == start) || (*p != '/')) { /* not a trailing slash */
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59 | ++p; /* so keep last character */
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60 | }
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61 | *p = 0;
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62 |
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63 | return start;
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64 | }
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