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45 lines
2.6 KiB
C
45 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 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/internal.h"
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#include "libc/intrin/atomic.h"
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#include "libc/limits.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/accounting.h"
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static uint32_t __kmp32(const void *buf, size_t size) {
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size_t i;
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uint32_t h;
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const uint32_t kPhiPrime = 0x9e3779b1;
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const unsigned char *p = (const unsigned char *)buf;
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for (h = i = 0; i < size; i++) h = (p[i] + h) * kPhiPrime;
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return h;
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}
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textwindows uint32_t __synthesize_uid(void) {
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char16_t buf[257];
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static atomic_uint uid;
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uint32_t tmp, size = ARRAYLEN(buf);
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if (!(tmp = atomic_load_explicit(&uid, memory_order_acquire))) {
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GetUserName(&buf, &size);
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tmp = __kmp32(buf, size >> 1) & INT_MAX;
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if (!tmp) ++tmp;
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atomic_store_explicit(&uid, tmp, memory_order_release);
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}
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return tmp;
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}
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