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