52 lines
2.8 KiB
C
52 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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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