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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
96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include "libc/calls/calls.h"
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#include "libc/calls/hefty/copyfile.h"
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#include "libc/conv/conv.h"
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#include "libc/errno.h"
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#include "libc/fmt/fmt.h"
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#include "libc/runtime/gc.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/ok.h"
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#include "libc/x/x.h"
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#include "third_party/getopt/getopt.h"
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#define USAGE \
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" SRC... DST\n\
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\n\
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SYNOPSIS\n\
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\n\
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Copies Files\n\
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\n\
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FLAGS\n\
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\n\
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-?\n\
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-h help\n\
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-f force\n\
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-n no clobber\n\
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-a preserve all\n\
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-p preserve owner and timestamps\n\
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\n"
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int flags;
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bool force;
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noreturn void PrintUsage(int rc, FILE *f) {
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fprintf(f, "%s%s%s", "Usage: ", program_invocation_name, USAGE);
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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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while ((opt = getopt(argc, argv, "?hfnap")) != -1) {
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switch (opt) {
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case 'f':
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force = true;
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break;
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case 'n':
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flags |= COPYFILE_NOCLOBBER;
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break;
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case 'a':
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case 'p':
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flags |= COPYFILE_PRESERVE_OWNER;
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flags |= COPYFILE_PRESERVE_TIMESTAMPS;
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break;
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case 'h':
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case '?':
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PrintUsage(EXIT_SUCCESS, stdout);
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default:
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PrintUsage(EX_USAGE, stderr);
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}
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}
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}
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int cp(const char *src, const char *dst) {
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if (endswith(dst, "/") || isdirectory(dst)) {
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dst = gc(xasprintf("%s/%s", dst, basename));
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}
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if (!force && access(dst, W_OK) == -1 && errno != ENOENT) goto OnFail;
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if (copyfile(src, dst, flags) == -1) goto OnFail;
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return 0;
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OnFail:
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fprintf(stderr, "%s %s %s: %s\n", "error: cp", src, dst, strerror(errno));
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return 1;
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}
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int main(int argc, char *argv[]) {
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int i;
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GetOpts(argc, argv);
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if (argc - optind < 2) PrintUsage(EX_USAGE, stderr);
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for (i = optind; i < argc - 1; ++i) {
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if (cp(argv[i], argv[argc - 1]) == -1) {
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return -1;
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}
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}
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return 0;
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}
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