mirror of
https://github.com/jart/cosmopolitan.git
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7b284f6bda
This change gets the pledge (formerly pledge.com) command back in tip top shape for a 3.0.1 cosmos release. It now runs on all platforms, even though it's mostly a no-op on ones that lack the kernel security stuff. The binary footprint is now smaller, since it no longer needs to link malloc. It's also now able to be built as a fat binary.
69 lines
3.1 KiB
C
69 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/str.h"
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/**
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* Joins paths, e.g.
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*
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* 0 + 0 → 0
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* "" + "" → ""
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* "a" + 0 → "a"
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* "a" + "" → "a/"
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* 0 + "b" → "b"
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* "" + "b" → "b"
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* "." + "b" → "./b"
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* "b" + "." → "b/."
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* "a" + "b" → "a/b"
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* "a/" + "b" → "a/b"
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* "a" + "b/" → "a/b/"
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* "a" + "/b" → "/b"
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*
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* @return joined path, which may be `buf`, `path`, or `other`, or null
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* if (1) `buf` didn't have enough space, or (2) both `path` and
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* `other` were null
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*/
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char *__join_paths(char *buf, size_t size, const char *path,
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const char *other) {
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size_t pathlen, otherlen;
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if (!other) return (char *)path;
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if (!path) return (char *)other;
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pathlen = strlen(path);
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if (!pathlen || *other == '/') {
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return (/*unconst*/ char *)other;
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}
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otherlen = strlen(other);
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if (path[pathlen - 1] == '/') {
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if (pathlen + otherlen + 1 <= size) {
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memmove(buf, path, pathlen);
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memmove(buf + pathlen, other, otherlen + 1);
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return buf;
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} else {
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return 0;
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}
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} else {
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if (pathlen + 1 + otherlen + 1 <= size) {
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memmove(buf, path, pathlen);
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buf[pathlen] = '/';
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memmove(buf + pathlen + 1, other, otherlen + 1);
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return buf;
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} else {
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return 0;
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}
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}
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}
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