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https://github.com/jart/cosmopolitan.git
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f4f4caab0e
I wanted a tiny scriptable meltdown proof way to run userspace programs and visualize how program execution impacts memory. It helps to explain how things like Actually Portable Executable works. It can show you how the GCC generated code is going about manipulating matrices and more. I didn't feel fully comfortable with Qemu and Bochs because I'm not smart enough to understand them. I wanted something like gVisor but with much stronger levels of assurances. I wanted a single binary that'll run, on all major operating systems with an embedded GPL barrier ZIP filesystem that is tiny enough to transpile to JavaScript and run in browsers too. https://justine.storage.googleapis.com/emulator625.mp4
122 lines
5.1 KiB
C
122 lines
5.1 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/bits/safemacros.h"
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#include "libc/calls/calls.h"
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#include "libc/conv/conv.h"
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#include "libc/log/check.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/ex.h"
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#include "libc/sysv/consts/exit.h"
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#include "libc/sysv/consts/fileno.h"
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#include "third_party/getopt/getopt.h"
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#include "third_party/zlib/zlib.h"
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#include "tool/decode/lib/bitabuilder.h"
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static size_t linecap;
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static FILE *fin, *fout;
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static uint32_t bit, maxbit;
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static struct BitaBuilder *bitset;
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static char *line, *tok, *s1, *category, *g_inpath, *g_outpath;
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noreturn void ShowUsage(FILE *f, int rc) {
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fprintf(f, "Usage: %s [-o OUTPUT] [INPUT]\n", "Usage",
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program_invocation_name);
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exit(rc);
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}
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void GetOpts(int argc, char *argv[]) {
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int opt;
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g_inpath = "/dev/stdin";
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g_outpath = "/dev/stdout";
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while ((opt = getopt(argc, argv, "?ho:")) != -1) {
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switch (opt) {
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case 'o':
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g_outpath = optarg;
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break;
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case 'h':
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case '?':
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ShowUsage(stdout, EXIT_SUCCESS);
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default:
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ShowUsage(stderr, EX_USAGE);
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}
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}
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if (argc - optind) {
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g_inpath = argv[optind];
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}
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}
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/**
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* Builds sparse unicode dataset for combining codepoints, e.g.
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*
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* UNDERLINING
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*
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* - COMBINING MACRON BELOW U+0331 (\xCC\xB1)
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* e.g. A̱ḆC̱Ḏ (too short) 41CCB1 42CCB1 43CCB1 44CCB1
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*
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* - COMBINING DOUBLE MACRON BELOW U+035F (\xCD\x9F)
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* e.g. A͟B͟C͟D͟ (too long) 41CD9F 42CD9F 43CD9F 44CD9F
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*
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* - DOUBLE PLUS COMBINING MACRON BELOW 3×U+035F + 1×U+0331
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* e.g. A͟B͟C͟Ḏ (just right) 41CCB1 42CCB1 43CCB1 44CD9F
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*
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* STRIKETHROUGH
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*
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* - COMBINING LONG STROKE OVERLAY U+0336 (\xCC\xB6)
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* e.g. A̶B̶C̶D̶ 41CCB6 42CCB6 43CCB6 44CCB6
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*
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* - COMBINING SHORT STROKE OVERLAY U+0335 (\xCC\xB5)
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* e.g. A̵B̵C̵D̵ 41CCB5 42CCB5 43CCB5 44CCB5
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*
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* - COMBINING SHORT SOLIDUS OVERLAY U+0337 (\xCC\xB7)
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* e.g. A̷B̷C̷D̷ 41CCB7 42CCB7 43CCB7 44CCB7
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*
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* - COMBINING LONG SOLIDUS OVERLAY U+0338 (\xCC\xB8)
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* e.g. A̸B̸C̸D̸ 41CCB8 42CCB8 43CCB8 44CCB8
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*
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* @see unicode.org/reports/tr11/#Definitions
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* @see https://www.compart.com/en/unicode/category/Sk (Modifier Symbol)
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*/
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int main(int argc, char *argv[]) {
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GetOpts(argc, argv);
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CHECK_NOTNULL(fin = fopen(g_inpath, "r"));
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bitset = bitabuilder_new();
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while ((getline(&line, &linecap, fin)) != -1) {
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tok = line;
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s1 = strsep(&tok, ";");
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strsep(&tok, ";");
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category = strsep(&tok, ";");
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if (!s1 || !category) continue;
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bit = strtoimax(s1, NULL, 16);
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if (bit != 0x00AD &&
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((0x1160 <= bit && bit <= 0x11FF) ||
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(strcmp(category, "Me") == 0 || strcmp(category, "Mn") == 0 ||
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strcmp(category, "Cf") == 0))) {
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maxbit = max(bit, maxbit);
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CHECK(bitabuilder_setbit(bitset, bit));
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}
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}
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CHECK_NOTNULL(fout = fopen(g_outpath, "wb"));
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CHECK(bitabuilder_fwrite(bitset, fout));
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bitabuilder_free(&bitset);
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return fclose(fin) | fclose(fout);
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}
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