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Diffstat (limited to 'REORG.TODO/misc/dirname.c')
-rw-r--r-- | REORG.TODO/misc/dirname.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/REORG.TODO/misc/dirname.c b/REORG.TODO/misc/dirname.c new file mode 100644 index 0000000000..7400354c8e --- /dev/null +++ b/REORG.TODO/misc/dirname.c @@ -0,0 +1,80 @@ +/* dirname - return directory part of PATH. + Copyright (C) 1996-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <libgen.h> +#include <string.h> + + +char * +dirname (char *path) +{ + static const char dot[] = "."; + char *last_slash; + + /* Find last '/'. */ + last_slash = path != NULL ? strrchr (path, '/') : NULL; + + if (last_slash != NULL && last_slash != path && last_slash[1] == '\0') + { + /* Determine whether all remaining characters are slashes. */ + char *runp; + + for (runp = last_slash; runp != path; --runp) + if (runp[-1] != '/') + break; + + /* The '/' is the last character, we have to look further. */ + if (runp != path) + last_slash = __memrchr (path, '/', runp - path); + } + + if (last_slash != NULL) + { + /* Determine whether all remaining characters are slashes. */ + char *runp; + + for (runp = last_slash; runp != path; --runp) + if (runp[-1] != '/') + break; + + /* Terminate the path. */ + if (runp == path) + { + /* The last slash is the first character in the string. We have to + return "/". As a special case we have to return "//" if there + are exactly two slashes at the beginning of the string. See + XBD 4.10 Path Name Resolution for more information. */ + if (last_slash == path + 1) + ++last_slash; + else + last_slash = path + 1; + } + else + last_slash = runp; + + last_slash[0] = '\0'; + } + else + /* This assignment is ill-designed but the XPG specs require to + return a string containing "." in any case no directory part is + found and so a static and constant string is required. */ + path = (char *) dot; + + return path; +} |