mirror of
https://github.com/jart/cosmopolitan.git
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58 lines
3.4 KiB
C
58 lines
3.4 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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│ This is free and unencumbered software released into the public domain. │
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│ │
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│ Anyone is free to copy, modify, publish, use, compile, sell, or │
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│ distribute this software, either in source code form or as a compiled │
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│ binary, for any purpose, commercial or non-commercial, and by any │
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│ means. │
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│ │
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│ In jurisdictions that recognize copyright laws, the author or authors │
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│ of this software dedicate any and all copyright interest in the │
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│ software to the public domain. We make this dedication for the benefit │
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│ of the public at large and to the detriment of our heirs and │
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│ successors. We intend this dedication to be an overt act of │
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│ relinquishment in perpetuity of all present and future rights to this │
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│ software under copyright law. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
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│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
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│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
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│ OTHER DEALINGS IN THE SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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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/vga/vga.internal.h"
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#ifdef __x86_64__
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ssize_t sys_readv_vga(struct Fd *fd, const struct iovec *iov, int iovlen) {
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/*
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* NOTE: this routine is always non-blocking.
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*
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* sys_readv_metal() calls here to ask if the VGA teletypewriter has any
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* "status reports" escape sequences to send out.
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*
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* If there are no such status reports, then immediately return ≤ 0.
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* sysv_readv_metal() will then try to read from an actual input device.
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*/
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size_t i, redd = 0;
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ssize_t res = 0;
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for (i = 0; i < iovlen; ++i) {
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void *input = iov[i].iov_base;
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size_t len = iov[i].iov_len;
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res = _TtyRead(&_vga_tty, input, len);
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if (res < 0) break;
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redd += res;
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if (redd != len) return redd;
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}
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if (!redd) return res;
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return redd;
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}
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#endif /* __x86_64__ */
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