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Bare metal VGA: implement "status report" escape codes (#613)

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* Bare metal VGA: implement "status report" escape codes
* Minor fix to pseudoteletypewriter code

Co-authored-by: tkchia <tkchia-cosmo@gmx.com>
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tkchia 2022-09-13 17:14:10 +08:00 • committed by GitHub
parent e0fabd1d49
commit df08b541af
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8 changed files with 113 additions and 10 deletions
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libc/vga/readv-vga.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ This is free and unencumbered software released into the public domain. │
│ │
│ Anyone is free to copy, modify, publish, use, compile, sell, or │
│ distribute this software, either in source code form or as a compiled │
│ binary, for any purpose, commercial or non-commercial, and by any │
│ means. │
│ │
│ In jurisdictions that recognize copyright laws, the author or authors │
│ of this software dedicate any and all copyright interest in the │
│ software to the public domain. We make this dedication for the benefit │
│ of the public at large and to the detriment of our heirs and │
│ successors. We intend this dedication to be an overt act of │
│ relinquishment in perpetuity of all present and future rights to this │
│ software under copyright law. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
│ OTHER DEALINGS IN THE SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/struct/fd.internal.h"
#include "libc/calls/struct/iovec.h"
#include "libc/calls/struct/iovec.internal.h"
#include "libc/vga/vga.internal.h"
ssize_t sys_readv_vga(struct Fd *fd, const struct iovec *iov, int iovlen) {
/* NOTE: this routine is always non-blocking. */
size_t i, redd = 0;
ssize_t res = 0;
for (i = 0; i < iovlen; ++i) {
void *input = iov[i].iov_base;
size_t len = iov[i].iov_len;
res = _TtyRead(&_vga_tty, input, len);
if (res < 0)
break;
redd += res;
if (redd != len)
return redd;
}
if (!redd)
return res;
return redd;
}