64 lines
2.8 KiB
C
64 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/errno.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/carsort.h"
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#include "tool/build/lib/xlaterrno.h"
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struct LinuxErrno {
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int32_t local;
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int32_t linux;
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};
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extern const char kLinuxErrnosLength[];
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extern const struct LinuxErrno kLinuxErrnos[];
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static struct LinuxErrno *errnos;
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/**
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* Turns local errno into Linux errno.
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*/
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int XlatErrno(int local) {
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static bool once;
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long i, n, m, l, r;
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n = (uintptr_t)kLinuxErrnosLength;
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if (!once) {
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errnos = malloc(sizeof(struct LinuxErrno) * n);
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for (i = 0; i < n; ++i) {
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errnos[i].local =
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*(int *)((intptr_t)kLinuxErrnos + kLinuxErrnos[i].local);
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errnos[i].linux = kLinuxErrnos[i].linux;
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}
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carsort100(n, (void *)errnos);
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once = true;
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}
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l = 0;
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r = n - 1;
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while (l <= r) {
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m = (l + r) / 2;
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if (errnos[m].local < local) {
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l = m + 1;
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} else if (errnos[m].local > local) {
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r = m - 1;
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} else {
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return errnos[m].linux;
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}
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}
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return ENOSYS;
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}
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