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https://github.com/jart/cosmopolitan.git
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51 lines
2.6 KiB
C
51 lines
2.6 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/errno.h"
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#include "libc/intrin/bits.h"
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#include "libc/stdio/rand.h"
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#include "libc/stdio/temp.h"
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#include "libc/str/str.h"
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/**
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* Generates temporary filename.
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*
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* char tmp[14] = "/tmp/hiXXXXXX";
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* puts(mkstemp(tmp));
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*
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* @param template is mutated to replace last six X's with rng
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* @raise EINVAL if `template` didn't end with `XXXXXX`
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* @return pointer to mutated `template`, or 0 w/ errno
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* @see mkstemp()
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*/
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char *mktemp(char *template) {
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int i, n;
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uint64_t w;
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if ((n = strlen(template)) < 6 ||
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READ16LE(template + n - 2) != READ16LE("XX") ||
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READ32LE(template + n - 6) != READ32LE("XXXX")) {
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errno = EINVAL;
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return 0;
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}
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w = _rand64();
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for (i = 0; i < 6; ++i) {
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template[n - 6 + i] = "0123456789abcdefghijklmnopqrstuvwxyz"[w % 36];
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w /= 36;
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}
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return template;
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}
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