Generate C code from a file

cdump.c

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char **argv)
{
  FILE *file;
  FILE *out_file;
  unsigned char c;
  int i;

  if (argc < 3) {
    fprintf(stderr, "Usage: cdump file var_name [out_file]\n");
    return EXIT_FAILURE;
  }

  if (argc >= 4) {
    out_file = fopen(argv[3], "w");
    if (out_file == NULL) {
      fprintf(stderr, "Could not open output file: %s\n", strerror(errno));
      return EXIT_FAILURE;
    }
  } else {
    out_file = stdout;
  }

  file = fopen(argv[1], "rb");
  if (file == NULL) {
    fprintf(stderr, "Could not open input file: %s\n", strerror(errno));
    return EXIT_FAILURE;
  }

  fprintf(out_file,
    "/* This file was automatically generated by cdump. DO NOT EDIT. */\n\n");
  fprintf(out_file, "static const char %s[] = {\n", argv[2]);

  i = 0;
  while ((fread(&c, sizeof(c), 1, file)) != 0) {
    if (i == 0) {
      fprintf(out_file, "\t\"");
    }
    if (c >= 32 && c <= 126) {
      if (c == '"') {
        fputs("\\\"", out_file);
        i += 2;
      } else if (c == '\\') {
        fputs("\\\\", out_file);
        i += 2;
      } else {
        putc(c, out_file);
        i += 1;
      }
    } else {
      fprintf(out_file, "\\x%02x", c);
      i += 4;
    }
    if (i >= 68) {
      fputs("\"\n", out_file);
      i = 0;
    }
  }

  if (i != 0) {
    fputs("\"\n", out_file);
  }
  fprintf(out_file, "\n};\n");

  return EXIT_SUCCESS;
}