54 lines
1023 B
C
54 lines
1023 B
C
/* vi: set sw=4 ts=4: */
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/*
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* bb_simplify_path implementation for busybox
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*
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* Copyright (C) 2001 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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char *bb_simplify_path(const char *path)
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{
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char *s, *start, *p;
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if (path[0] == '/')
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start = xstrdup(path);
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else {
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s = xrealloc_getcwd_or_warn(NULL);
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start = concat_path_file(s, path);
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free(s);
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}
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p = s = start;
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do {
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if (*p == '/') {
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if (*s == '/') { /* skip duplicate (or initial) slash */
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continue;
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}
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if (*s == '.') {
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if (s[1] == '/' || !s[1]) { /* remove extra '.' */
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continue;
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}
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if ((s[1] == '.') && (s[2] == '/' || !s[2])) {
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++s;
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if (p > start) {
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while (*--p != '/') /* omit previous dir */
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continue;
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}
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continue;
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}
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}
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}
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*++p = *s;
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} while (*++s);
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if ((p == start) || (*p != '/')) { /* not a trailing slash */
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++p; /* so keep last character */
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}
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*p = 0;
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return start;
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}
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