cosmopolitan/libc/conv/basename_n.c

51 lines
2.7 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ 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; version 2 of the License. │
│ │
│ 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., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/conv/conv.h"
#include "libc/conv/isslash.internal.h"
/**
* Returns pointer to last filename component in path.
*
* Both / and \ are are considered valid component separators on all
* platforms. Trailing slashes are ignored. We don't grant special
* consideration to things like foo/., c:/, \\?\Volume, etc.
*
* @param path is UTF-8 path
* @param size is byte length of path
* @return pointer inside path or path itself
*/
textstartup char *basename_n(const char *path, size_t size) {
size_t i, l;
if (size) {
if (isslash(path[size - 1])) {
l = size - 1;
while (l && isslash(path[l - 1])) --l;
if (!l) return (/*unconst*/ char *)&path[size - 1];
size = l;
}
for (i = size; i > 0; --i) {
if (isslash(path[i - 1])) {
return (/*unconst*/ char *)&path[i];
}
}
}
return (/*unconst*/ char *)path;
}