mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-17 02:52:40 +00:00
2ab9e9f7fd
- Introduce portable sched_getcpu() api - Support GCC's __target_clones__ feature - Make fma() go faster on x86 in default mode - Remove some asan checks from core libraries - WinMain() now ensures $HOME and $USER are defined
51 lines
2.7 KiB
C
51 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/stdio/rand.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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static char g_tmpnam[L_tmpnam];
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/**
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* Generates temporary file name.
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*
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* @param buf may be null to generate `/tmp/tmpnam_XXXXXX` to a static
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* buffer (it works on Windows) that is not thread safe; otherwise
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* the caller must supply a buffer with `L_tmpnam` bytes available
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* @return unique generated filename, or null on failure; `buf` memory
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* is only mutated on success
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*/
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char *tmpnam(char *buf) {
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char path[] = P_tmpdir "/tmpnam_XXXXXX";
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for (int t = 0; t < 100; ++t) {
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int w = _rand64();
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for (int i = 0; i < 6; ++i) {
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path[sizeof(path) - 1 - 6 + i] =
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"0123456789abcdefghikmnpqrstvwxyz"[w & 31];
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w >>= 5;
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}
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if (!fileexists(path)) {
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return strcpy(buf ? buf : g_tmpnam, path);
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}
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}
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return 0;
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}
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