mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
71 lines
3.2 KiB
C
71 lines
3.2 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 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/intrin/bits.h"
|
|
#include "libc/str/path.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Joins paths, e.g.
|
|
*
|
|
* 0 + 0 → 0
|
|
* "" + "" → ""
|
|
* "a" + 0 → "a"
|
|
* "a" + "" → "a/"
|
|
* 0 + "b" → "b"
|
|
* "" + "b" → "b"
|
|
* "." + "b" → "./b"
|
|
* "b" + "." → "b/."
|
|
* "a" + "b" → "a/b"
|
|
* "a/" + "b" → "a/b"
|
|
* "a" + "b/" → "a/b/"
|
|
* "a" + "/b" → "/b"
|
|
*
|
|
* @return joined path, which may be `buf`, `path`, or `other`, or null
|
|
* if (1) `buf` didn't have enough space, or (2) both `path` and
|
|
* `other` were null
|
|
*/
|
|
char *_joinpaths(char *buf, size_t size, const char *path, const char *other) {
|
|
size_t pathlen, otherlen;
|
|
if (!other) return path;
|
|
if (!path) return other;
|
|
pathlen = strlen(path);
|
|
if (!pathlen || *other == '/') {
|
|
return (/*unconst*/ char *)other;
|
|
}
|
|
otherlen = strlen(other);
|
|
if (path[pathlen - 1] == '/') {
|
|
if (pathlen + otherlen + 1 <= size) {
|
|
memmove(buf, path, pathlen);
|
|
memmove(buf + pathlen, other, otherlen + 1);
|
|
return buf;
|
|
} else {
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (pathlen + 1 + otherlen + 1 <= size) {
|
|
memmove(buf, path, pathlen);
|
|
buf[pathlen] = '/';
|
|
memmove(buf + pathlen + 1, other, otherlen + 1);
|
|
return buf;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|