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https://github.com/jart/cosmopolitan.git
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9e3e985ae5
Here's some screenshots of an emulator tui program that was compiled on Linux, then scp'd it to Windows, Mac, and FreeBSD. https://justine.storage.googleapis.com/blinkenlights-cmdexe.png https://justine.storage.googleapis.com/blinkenlights-imac.png https://justine.storage.googleapis.com/blinkenlights-freebsd.png https://justine.storage.googleapis.com/blinkenlights-lisp.png How is this even possible that we have a nontrivial ui binary that just works on Mac, Windows, Linux, and BSD? Surely a first ever achievement. Fixed many bugs. Bootstrapped John McCarthy's metacircular evaluator on bare metal in half the size of Altair BASIC (about 2.5kb) and ran it in emulator for fun and profit.
112 lines
4.9 KiB
C
112 lines
4.9 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/bits/bits.h"
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#include "libc/bits/pushpop.h"
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#include "libc/bits/safemacros.h"
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#include "libc/runtime/internal.h"
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#include "libc/str/appendchar.h"
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#include "libc/str/str.h"
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#include "libc/str/tpenc.h"
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#include "libc/str/utf16.h"
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/* TODO(jart): Make early-stage data structures happen. */
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#undef isspace
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#undef iswspace
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#define isspace(c) ((c) == ' ' || (c) == '\t' || (c) == '\n' || (c) == '\r')
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#define iswspace(c) isspace(c)
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struct DosArgv {
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const char16_t *s;
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char *p;
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char *pe;
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wint_t wc;
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};
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static textwindows void AppendDosArgv(struct DosArgv *st, wint_t wc) {
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AppendChar(&st->p, st->pe, wc);
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}
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/**
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* Tokenizes and transcodes Windows NT CLI args, thus avoiding
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* CommandLineToArgv() schlepping in forty megs of dependencies.
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*
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* @param s is the command line string provided by the executive
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* @param buf is where we'll store double-NUL-terminated decoded args
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* @param size is how many bytes are available in buf
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* @param argv is where we'll store the decoded arg pointer array, which
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* is guaranteed to be NULL-terminated if max>0
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* @param max specifies the item capacity of argv, or 0 to do scanning
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* @return number of args written, excluding the NULL-terminator; or,
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* if the output buffer wasn't passed, or was too short, then the
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* number of args that *would* have been written is returned; and
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* there are currently no failure conditions that would have this
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* return -1 since it doesn't do system calls
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* @see test/libc/dosarg_test.c
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* @see libc/runtime/ntspawn.c
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* @note kudos to Simon Tatham for figuring out quoting behavior
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*/
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textwindows int GetDosArgv(const char16_t *cmdline, char *buf, size_t size,
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char **argv, size_t max) {
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bool inquote;
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size_t i, argc, slashes, quotes;
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struct DosArgv st;
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st.s = cmdline;
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st.p = buf;
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st.pe = buf + size;
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argc = 0;
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st.wc = DecodeNtsUtf16(&st.s);
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while (st.wc) {
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while (st.wc && iswspace(st.wc)) st.wc = DecodeNtsUtf16(&st.s);
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if (!st.wc) break;
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if (++argc < max) {
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argv[argc - 1] = st.p < st.pe ? st.p : NULL;
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}
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inquote = false;
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while (st.wc) {
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if (!inquote && isspace(st.wc)) break;
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if (st.wc == '"' || st.wc == '\\') {
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slashes = 0;
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quotes = 0;
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while (st.wc == '\\') st.wc = DecodeNtsUtf16(&st.s), slashes++;
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while (st.wc == '"') st.wc = DecodeNtsUtf16(&st.s), quotes++;
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if (!quotes) {
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while (slashes--) AppendDosArgv(&st, '\\');
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} else {
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while (slashes >= 2) AppendDosArgv(&st, '\\'), slashes -= 2;
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if (slashes) AppendDosArgv(&st, '"'), quotes--;
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if (quotes > 0) {
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if (!inquote) quotes--;
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for (i = 3; i <= quotes + 1; i += 3) AppendDosArgv(&st, '"');
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inquote = (quotes % 3 == 0);
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}
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}
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} else {
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AppendDosArgv(&st, st.wc);
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st.wc = DecodeNtsUtf16(&st.s);
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}
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}
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AppendDosArgv(&st, '\0');
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}
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AppendDosArgv(&st, '\0');
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if (size) buf[min(st.p - buf, size - 1)] = '\0';
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if (max) argv[min(argc, max - 1)] = NULL;
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return argc;
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}
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