mirror of
https://github.com/jart/cosmopolitan.git
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6e6fc38935
Commit bc6c183 introduced a bunch of discrepancies between what files
look like in the repo and what clang-format says they should look like.
However, there were already a few discrepancies prior to that. Most of
these discrepancies seemed to be unintentional, but a few of them were
load-bearing (e.g., a #include that violated header ordering needing
something to have been #defined by a 'later' #include.)
I opted to take what I hope is a relatively smooth-brained approach: I
reverted the .clang-format change, ran clang-format on the whole repo,
reapplied the .clang-format change, reran clang-format again, and then
reverted the commit that contained the first run. Thus the full effect
of this PR should only be to apply the changed formatting rules to the
repo, and from skimming the results, this seems to be the case.
My work can be checked by applying the short, manual commits, and then
rerunning the command listed in the autogenerated commits (those whose
messages I have prefixed auto:) and seeing if your results agree.
It might be that the other diffs should be fixed at some point but I'm
leaving that aside for now.
fd '\.c(c|pp)?$' --print0| xargs -0 clang-format -i
266 lines
8.3 KiB
C
266 lines
8.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/errno.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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* "\e[38;5;202m" ORANGERED
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* "\e[A" UP
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* "\e\e[A" ALT-UP
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* "\001" CTRL-ALFA
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* "\e\001" ALT-CTRL-ALFA
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* "\eOP" PF1
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* "\000" NUL
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* "\e]rm -rf /\e\\" OSC
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* "\302\233A" UP
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* "\300\200" NUL
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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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* @param p is guaranteed to receive a NUL terminator if n>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 *p, size_t n) {
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wint_t x;
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ssize_t rc;
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int e, i, j;
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unsigned char c;
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enum { kAscii, kUtf8, kEsc, kCsi1, kCsi2, kSs, kNf, kStr, kStr2, kDone } t;
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e = errno;
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t = kAscii;
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x = i = j = 0;
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if (n)
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p[0] = 0;
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do {
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for (;;) {
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if (n) {
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rc = read(fd, &c, 1);
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} else {
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rc = read(fd, 0, 0);
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}
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if (rc == -1 && errno == EINTR) {
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if (!i) {
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return -1;
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}
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} else if (rc == -1) {
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return -1;
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} else if (!rc) {
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if (!i) {
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errno = e;
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return 0;
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} else {
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return eilseq();
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}
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} else {
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break;
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}
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}
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if (i + 1 < n) {
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p[i] = c;
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p[i + 1] = 0;
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} else if (i < n) {
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p[i] = 0;
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}
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++i;
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switch (t) {
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Whoopsie:
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if (n)
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p[0] = c;
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t = kAscii;
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i = 1;
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/* fallthrough */
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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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t = kDone;
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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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} else {
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/* ignore overlong sequences */
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}
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break;
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case kUtf8:
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if ((c & 0300) == 0200) {
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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; /* parsed but not canonicalized */
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break;
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case 0x9b:
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t = kCsi1; /* unusual but legal */
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break;
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case 0x8e:
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case 0x8f:
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t = kSs; /* unusual but legal */
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break;
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case 0x90: /* DCS (Device Control String) */
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case 0x98: /* SOS (Start of String) */
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case 0x9d: /* OSC (Operating System Command) */
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case 0x9e: /* PM (Privacy Message) */
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case 0x9f: /* APC (Application Program Command) */
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t = kStr;
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break;
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default:
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t = kDone;
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break;
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}
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}
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} else {
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goto Whoopsie; /* ignore underlong sequences if not eof */
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}
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break;
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case kEsc:
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if (0x20 <= c && c <= 0x2f) { /* Nf */
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/*
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* Almost no one uses ANSI Nf sequences
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* They overlaps with alt+graphic keystrokes
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* We care more about being able to type alt-/
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*/
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if (c == ' ' || c == '#') {
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t = kNf;
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} else {
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t = kDone;
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}
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} else if (0x30 <= c && c <= 0x3f) { /* Fp */
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t = kDone;
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} else if (0x20 <= c && c <= 0x5F) { /* Fe */
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switch (c) {
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case '[':
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t = kCsi1;
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break;
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case 'N': /* SS2 */
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case 'O': /* SS3 */
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t = kSs;
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break;
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case 'P': /* DCS (Device Control String) */
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case 'X': /* SOS (Start of String) */
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case ']': /* DCS (Operating System Command) */
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case '^': /* PM (Privacy Message) */
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case '_': /* DCS (Application Program Command) */
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t = kStr;
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break;
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default:
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t = kDone;
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break;
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}
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} else if (0x60 <= c && c <= 0x7e) { /* Fs */
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t = kDone;
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} else if (c == '\e') {
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if (i < 3) {
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t = kEsc; /* alt chording */
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} else {
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t = kDone; /* esc mashing */
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i = 1;
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}
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} else {
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t = kDone;
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}
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break;
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case kSs:
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t = kDone;
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break;
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case kNf:
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if (0x30 <= c && c <= 0x7e) {
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t = kDone;
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} else if (!(0x20 <= c && c <= 0x2f)) {
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goto Whoopsie;
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}
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break;
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case kCsi1:
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if (0x20 <= c && c <= 0x2f) {
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t = kCsi2;
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} else if (c == '[' && (i == 3 || (i == 4 && p[1] == '\e'))) {
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/* linux function keys */
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} else if (0x40 <= c && c <= 0x7e) {
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t = kDone;
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} else if (!(0x30 <= c && c <= 0x3f)) {
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goto Whoopsie;
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}
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break;
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case kCsi2:
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if (0x40 <= c && c <= 0x7e) {
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t = kDone;
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} else if (!(0x20 <= c && c <= 0x2f)) {
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goto Whoopsie;
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}
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break;
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case kStr:
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switch (c) {
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case '\a':
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t = kDone;
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break;
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case '\e': /* ESC */
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case 0302: /* C1 (UTF-8) */
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t = kStr2;
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break;
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default:
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break;
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}
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break;
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case kStr2:
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switch (c) {
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case '\a':
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t = kDone;
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break;
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case '\\': /* ST (ASCII) */
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case 0234: /* ST (UTF-8) */
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t = kDone;
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break;
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default:
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t = kStr;
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break;
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}
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break;
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default:
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__builtin_unreachable();
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}
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} while (t != kDone);
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errno = e;
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return i;
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}
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