cosmopolitan/tool/viz/dumphexc.c

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/fmt/fmt.h"
#include "libc/macros.internal.h"
#include "libc/stdio/append.internal.h"
#include "libc/stdio/hex.internal.h"
#include "libc/stdio/stdio.h"

/**
 * @fileoverview Hex String Literal Converter, e.g.
 *
 *     $ echo hello | o/tool/viz/dumphexc.com
 *     "\
 *     \x68\x65\x6c\x6c\x6f\x0a"
 */

int main(int argc, char *argv[]) {
  char *p;
  size_t n, g;
  char *b = 0;
  char buf[512];
  while ((g = fread(buf, 1, sizeof(buf), stdin))) {
    appendd(&b, buf, g);
  }
  if (!ferror(stdin)) {
    p = DumpHexc(b, appendz(b).i, &n);
    fwrite(p, 1, n, stdout);
    free(p);
  }
  printf("\n");
  return ferror(stdin) || ferror(stdout) ? 1 : 0;
}