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 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/assert.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/limits.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/overlapped.h"
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#include "libc/sysv/errfuns.h"
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static size_t SumIovecLen(const struct iovec *v, size_t n) {
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size_t i, sum;
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for (sum = i = 0; i < n; ++i) {
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sum += v[i].iov_len;
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}
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return sum;
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}
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textwindows ssize_t write$nt(struct Fd *fd, const struct iovec *iov,
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size_t iovlen, ssize_t opt_offset) {
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uint32_t wrote;
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struct NtOverlapped overlap;
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while (iovlen && !iov[0].iov_len) iov++, iovlen--;
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if (WriteFile(fd->handle, iovlen ? iov[0].iov_base : NULL,
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iovlen ? clampio(iov[0].iov_len) : 0, &wrote,
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offset2overlap(opt_offset, &overlap))) {
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if (!wrote) assert(SumIovecLen(iov, iovlen) > 0);
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FlushFileBuffers(fd->handle);
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return wrote;
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} else {
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return __winerr();
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}
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}
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