mirror of
https://github.com/jart/cosmopolitan.git
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5b60e5a37d
The termios::c_cc field turned out to be incorrectly defined on Linux due to some confusion between the glibc and kernel definitions. We'll be using the kernel definition, since it has the strongest consensus. Fields have been have been added to struct stat for BSD compatibility such as st_birthtim, plus the GLIBC compatibility of isystem/sys/stat has been improved.
140 lines
5 KiB
C
140 lines
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=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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│ 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/str/thompike.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Reads single keystroke or control sequence from character device.
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*
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* When reading ANSI UTF-8 text streams, characters and control codes
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* are oftentimes encoded as multi-byte sequences. This function knows
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* how long each sequence is, so that each read consumes a single thing
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* from the underlying file descriptor, e.g.
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*
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* "a" ALFA
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* "\316\261" ALPHA
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* "\033[A" CURSOR UP
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* "\033[38;5;202m" ORANGERED
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* "\eOP" PF1
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*
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* This routine generalizes to ascii, utf-8, chorded modifier keys,
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* function keys, color codes, c0/c1 control codes, cursor movement,
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* mouse movement, etc.
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*
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* Userspace buffering isn't required, since ANSI escape sequences and
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* UTF-8 are decoded without peeking. Noncanonical overlong encodings
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* can cause the stream to go out of sync. This function recovers such
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* events by ignoring continuation bytes at the beginning of each read.
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*
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* String control sequences, e.g. "\e_hello\e\\" currently are not
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* tokenized as a single read. Lastly note, this function has limited
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* support for UNICODE representations of C0/C1 control codes, e.g.
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*
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* "\000" NUL
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* "\300\200" NUL
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* "\302\233A" CURSOR UP
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*
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* @param buf is guaranteed to receive a NUL terminator if size>0
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* @return number of bytes read (helps differentiate "\0" vs. "")
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* @see examples/ttyinfo.c
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* @see ANSI X3.64-1979
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* @see ISO/IEC 6429
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* @see FIPS-86
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* @see ECMA-48
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*/
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ssize_t readansi(int fd, char *buf, size_t size) {
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wint_t x;
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uint8_t c;
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int i, j, rc;
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enum { kAscii, kUtf8, kEsc, kCsi, kSs } t;
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if (size) buf[0] = 0;
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for (j = i = 0, t = kAscii;;) {
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if (i + 2 >= size) return enomem();
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if ((rc = read(fd, &c, 1)) != 1) return rc;
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buf[i++] = c;
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buf[i] = 0;
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switch (t) {
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case kAscii:
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if (c < 0200) {
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if (c == '\e') {
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t = kEsc;
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} else {
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return i;
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}
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} else if (c >= 0300) {
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t = kUtf8;
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x = ThomPikeByte(c);
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j = ThomPikeLen(c) - 1;
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}
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break;
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case kUtf8:
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x = ThomPikeMerge(x, c);
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if (!--j) {
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switch (x) {
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case '\e':
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t = kEsc;
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break;
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case 0x9b:
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t = kCsi;
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break;
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default:
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return i;
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}
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}
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break;
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case kEsc:
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switch (c) {
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case '[':
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t = kCsi;
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break;
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case 'N':
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case 'O':
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t = kSs;
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break;
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case '\e':
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case 0x20 ... 0x2F:
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break;
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default:
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return i;
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}
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break;
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case kCsi:
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switch (c) {
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case '[':
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case ':':
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case ';':
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case '<':
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case '=':
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case '>':
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case '?':
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case '0' ... '9':
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break;
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default:
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return i;
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}
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break;
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case kSs:
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return i;
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default:
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unreachable;
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}
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}
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}
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