mirror of
https://github.com/jart/cosmopolitan.git
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63 lines
3.2 KiB
C
63 lines
3.2 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 2021 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/calls/metalfile.internal.h"
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#include "libc/calls/struct/fd.internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/calls/struct/iovec.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/macros.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/vga/vga.internal.h"
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#ifdef __x86_64__
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ssize_t sys_readv_metal(int fd, const struct iovec *iov, int iovlen) {
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int i;
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size_t got, toto;
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struct MetalFile *file;
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switch (g_fds.p[fd].kind) {
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case kFdConsole:
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/*
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* The VGA teletypewriter code may wish to send out "status report"
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* escape sequences, in response to requests sent to it via write().
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* Read & return these if they are available.
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*/
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if (_weaken(sys_readv_vga)) {
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ssize_t res = _weaken(sys_readv_vga)(g_fds.p + fd, iov, iovlen);
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if (res > 0) return res;
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}
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/* fall through */
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case kFdSerial:
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return sys_readv_serial(fd, iov, iovlen);
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case kFdFile:
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file = (struct MetalFile *)g_fds.p[fd].handle;
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for (toto = i = 0; i < iovlen && file->pos < file->size; ++i) {
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got = MIN(iov[i].iov_len, file->size - file->pos);
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if (got) memcpy(iov[i].iov_base, file->base, got);
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toto += got;
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}
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return toto;
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default:
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return ebadf();
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}
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}
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#endif /* __x86_64__ */
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