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/* xdirname.c: return the directory part of a path.
Copyright 1999, 2008, 2011, 2016, 2017 Karl Berry.
Copyright 2005 Olaf Weber.
This 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.
This 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 this library; if not, see <http://www.gnu.org/licenses/>. */
/* Return directory for NAME. This is "." if NAME contains no directory
separators (should never happen for selfdir), else whatever precedes
the final directory separator, but with multiple separators stripped.
For example, `xdirname ("/foo//bar.baz")' returns "/foo". Always
return a new string. */
#include <kpathsea/config.h>
#include <kpathsea/c-pathch.h>
string
xdirname (const_string name)
{
string ret;
unsigned limit = 0, loc;
#if defined(WIN32)
string p;
#endif
/* Ignore a NULL name. */
if (!name)
return NULL;
if (NAME_BEGINS_WITH_DEVICE(name)) {
limit = 2;
} else if (IS_UNC_NAME(name)) {
for (limit = 2; name[limit] && !IS_DIR_SEP (name[limit]); limit++)
;
if (name[limit++] && name[limit] && !IS_DIR_SEP (name[limit])) {
for (; name[limit] && !IS_DIR_SEP (name[limit]); limit++)
;
limit--;
} else
/* malformed UNC name, backup */
limit = 0;
}
#if defined(WIN32) && defined (KPSE_COMPAT_API)
for (loc = strlen (name); loc > limit &&
(!IS_DIR_SEP (name[loc-1]) ||
(loc > 1 && IS_KANJI(name+loc-2))); loc--)
;
#else
for (loc = strlen (name); loc > limit && !IS_DIR_SEP (name[loc-1]); loc--)
;
#endif
if (loc == limit) {
if (limit == 0)
ret = xstrdup (".");
else if (limit == 2) {
ret = (string)xmalloc(4);
ret[0] = name[0];
ret[1] = name[1];
ret[2] = '.';
ret[3] = '\0';
} else {
/* UNC name is "//server/share". */
ret = xstrdup (name);
}
} else {
/* If have ///a, must return /, so don't strip off everything. */
#if defined(WIN32) && defined (KPSE_COMPAT_API)
while (loc > limit+1 && IS_DIR_SEP (name[loc-1])) {
if (loc > 1 && IS_KANJI(name+loc-2))
break;
loc--;
}
#else
while (loc > limit+1 && IS_DIR_SEP (name[loc-1])) {
loc--;
}
#endif
ret = (string)xmalloc(loc+1);
strncpy(ret, name, loc);
ret[loc] = '\0';
}
#if defined(WIN32)
for (p = ret; *p; p++) {
if (*p == '\\')
*p = '/';
#if defined (KPSE_COMPAT_API)
else if (IS_KANJI(p))
p++;
#endif
}
#endif
return ret;
}
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