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| author | Matt Kraai <kraai@debian.org> | 2001-08-10 15:05:27 +0000 |
|---|---|---|
| committer | Matt Kraai <kraai@debian.org> | 2001-08-10 15:05:27 +0000 |
| commit | a7cecbc9170eed93d365c0c38e8ba1477ab0a40c (patch) | |
| tree | 3541c27248b0d143cb06b9f61472b568414cb110 /libbb/simplify_path.c | |
| parent | 4fb0b517035ddc189bd696e3175bf18dbc37d441 (diff) | |
| download | busybox-w32-a7cecbc9170eed93d365c0c38e8ba1477ab0a40c.tar.gz busybox-w32-a7cecbc9170eed93d365c0c38e8ba1477ab0a40c.tar.bz2 busybox-w32-a7cecbc9170eed93d365c0c38e8ba1477ab0a40c.zip | |
Commit Vladimir's simplify_path.
Diffstat (limited to 'libbb/simplify_path.c')
| -rw-r--r-- | libbb/simplify_path.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/libbb/simplify_path.c b/libbb/simplify_path.c new file mode 100644 index 000000000..4641bae88 --- /dev/null +++ b/libbb/simplify_path.c | |||
| @@ -0,0 +1,78 @@ | |||
| 1 | /* vi: set sw=4 ts=4: */ | ||
| 2 | /* | ||
| 3 | * simplify_path implementation for busybox | ||
| 4 | * | ||
| 5 | * | ||
| 6 | * Copyright (C) 2001 Vladimir N. Oleynik <dzo@simtreas.ru> | ||
| 7 | * | ||
| 8 | * | ||
| 9 | * This program is free software; you can redistribute it and/or modify | ||
| 10 | * it under the terms of the GNU General Public License as published by | ||
| 11 | * the Free Software Foundation; either version 2 of the License, or | ||
| 12 | * (at your option) any later version. | ||
| 13 | * | ||
| 14 | * This program is distributed in the hope that it will be useful, | ||
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 17 | * General Public License for more details. | ||
| 18 | * | ||
| 19 | * You should have received a copy of the GNU General Public License | ||
| 20 | * along with this program; if not, write to the Free Software | ||
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| 22 | * | ||
| 23 | */ | ||
| 24 | |||
| 25 | #include <stdlib.h> | ||
| 26 | |||
| 27 | #include "libbb.h" | ||
| 28 | |||
| 29 | static inline char *strcpy_overlap(char *dst, const char *src) | ||
| 30 | { | ||
| 31 | char *ptr = dst; | ||
| 32 | |||
| 33 | do *dst++ = *src; while (*src++); | ||
| 34 | return ptr; | ||
| 35 | } | ||
| 36 | |||
| 37 | char *simplify_path(const char *path) | ||
| 38 | { | ||
| 39 | char *s, *start, *next; | ||
| 40 | |||
| 41 | if (path[0] == '/') | ||
| 42 | start = xstrdup(path); | ||
| 43 | else { | ||
| 44 | s = xgetcwd(NULL); | ||
| 45 | start = concat_path_file(s, path); | ||
| 46 | free(s); | ||
| 47 | } | ||
| 48 | s = start; | ||
| 49 | /* remove . and .. */ | ||
| 50 | while(*s) { | ||
| 51 | if(*s++ == '/' && (*s == '/' || *s == 0)) { | ||
| 52 | /* remove duplicate and trailing slashes */ | ||
| 53 | s = strcpy_overlap(s-1, s); | ||
| 54 | } | ||
| 55 | else if(*(s-1) == '.' && *(s-2)=='/') { | ||
| 56 | if(*s == '/' || *s == 0) { | ||
| 57 | /* remove . */ | ||
| 58 | s = strcpy_overlap(s-1, s); /* maybe set // */ | ||
| 59 | s--; | ||
| 60 | } else if(*s == '.') { | ||
| 61 | next = s+1; /* set after ".." */ | ||
| 62 | if(*next == '/' || *next == 0) { /* "../" */ | ||
| 63 | if((s-=2) > start) | ||
| 64 | /* skip previous dir */ | ||
| 65 | do s--; while(*s != '/'); | ||
| 66 | /* remove previous dir */ | ||
| 67 | strcpy_overlap(s, next); | ||
| 68 | } | ||
| 69 | |||
| 70 | } | ||
| 71 | } | ||
| 72 | } | ||
| 73 | if(start[0]==0) { | ||
| 74 | start[0]='/'; | ||
| 75 | start[1]=0; | ||
| 76 | } | ||
| 77 | return start; | ||
| 78 | } | ||