/* vi: set sw=4 ts=4: */ /* * simplify_path implementation for busybox * * Copyright (C) 2001 Manuel Novoa III <mjn3@opensource.lineo.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <stdlib.h> #include "libbb.h" char *simplify_path(const char *path) { char *s, *start, *p; if (path[0] == '/') start = xstrdup(path); else { s = xgetcwd(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; }