mirror of
https://github.com/jart/cosmopolitan.git
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88 lines
3.5 KiB
C
88 lines
3.5 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=8 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/calls/calls.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/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/stdio/internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/o.h"
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/**
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* Writes data to stream.
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*
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* @param stride specifies the size of individual items
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* @param count is the number of strides to write
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* @return count on success, [0,count) on EOF, 0 on error or count==0
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*/
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size_t fwrite(const void *data, size_t stride, size_t count, FILE *f) {
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ldiv_t d;
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ssize_t rc;
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size_t n, m;
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const char *p;
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struct iovec iov[2];
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if ((f->iomode & O_ACCMODE) == O_RDONLY) {
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f->state = errno = EBADF;
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return 0;
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}
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n = stride * count;
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m = f->size - f->beg;
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if (n <= m && f->bufmode != _IONBF) {
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memcpy(f->buf + f->beg, data, n);
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f->beg += n;
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if (f->fd != -1 && f->bufmode == _IOLBF &&
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(p = memrchr(f->buf, '\n', f->beg))) {
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n = p + 1 - f->buf;
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if ((rc = write(f->fd, f->buf, n)) == -1) {
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if (errno == EINTR || errno == EAGAIN) return count;
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f->state = errno;
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return 0;
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}
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n = rc;
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memmove(f->buf, f->buf + n, f->beg - n);
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f->beg -= n;
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}
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return count;
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}
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if (f->fd == -1) {
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n = MIN(n, m);
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d = ldiv(n, stride);
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n -= d.rem;
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memcpy(f->buf + f->beg, data, n);
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f->beg += n;
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f->state = -1;
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return d.quot;
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}
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iov[0].iov_base = f->buf;
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iov[0].iov_len = f->beg;
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iov[1].iov_base = data;
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iov[1].iov_len = n;
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n += f->beg;
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if (WritevUninterruptible(f->fd, iov, 2) == -1) {
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f->state = errno;
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return 0;
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}
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f->beg = 0;
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return count;
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}
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