mirror of
https://github.com/jart/cosmopolitan.git
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58 lines
2.8 KiB
C
58 lines
2.8 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 2020 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/fmt/conv.h"
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#include "libc/str/path.h"
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#include "libc/str/str.h"
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/**
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* Returns directory portion of path, e.g.
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*
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* path │ dirname() │ basename()
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* ─────────────────────────────────
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* . │ . │ .
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* .. │ . │ ..
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* / │ / │ /
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* usr │ . │ usr
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* /usr/ │ / │ usr
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* /usr/lib │ /usr │ lib
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*
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* @param path is UTF-8 and may be mutated, but not expanded in length
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* @return pointer to path, or inside path, or to a special r/o string
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* @see basename()
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* @see SUSv2
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*/
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char *dirname(char *path) {
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size_t i;
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if (path && *path) {
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i = strlen(path) - 1;
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for (; _isdirsep(path[i]); i--) {
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if (!i) return "/";
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}
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for (; !_isdirsep(path[i]); i--) {
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if (!i) return ".";
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}
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for (; _isdirsep(path[i]); i--) {
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if (!i) return "/";
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}
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path[i + 1] = 0;
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return path;
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} else {
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return ".";
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}
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}
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