Slightly modified version using header guards

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// bin2c.c
//
// convert a binary file into a C source vector
//
// THE "BEER-WARE LICENSE" (Revision 3.1415):
// sandro AT sigala DOT it wrote this file. As long as you retain this notice you can do
// whatever you want with this stuff.  If we meet some day, and you think this stuff is
// worth it, you can buy me a beer in return.  Sandro Sigala
//
// syntax:  bin2c [-c] [-z] <input_file> <output_file>
//
//          -c    add the "const" keyword to definition
//          -z    terminate the array with a zero (useful for embedded C strings)
//
// examples:
//     bin2c -c myimage.png myimage_png.cpp
//     bin2c -z sometext.txt sometext_txt.cpp
 
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#ifndef PATH_MAX
#define PATH_MAX 1024
#endif
 
int useconst = 0;
int zeroterminated = 0;
 
int myfgetc(FILE *f)
{
  int c = fgetc(f);
  if (c == EOF && zeroterminated) {
    zeroterminated = 0;
    return 0;
  }
  return c;
}


char* str2upr(char *s)
{
  char * r = (char *) calloc(strlen(s)+1, sizeof(char));
  
  int i = 0;
  while(*s)
    {
      r[i] = toupper(*s);
      ++i;
      ++s;
    }
  return r;
} 


 
void process(const char *ifname, const char *ofname)
{
  FILE *ifile, *ofile;
  ifile = fopen(ifname, "rb");
  if (ifile == NULL) {
    fprintf(stderr, "cannot open %s for reading\n", ifname);
    exit(1);
  }
  ofile = fopen(ofname, "wb");
  if (ofile == NULL) {
    fprintf(stderr, "cannot open %s for writing\n", ofname);
    exit(1);
  }
  char buf[PATH_MAX], *p;
  const char *cp;
  if ((cp = strrchr(ifname, '/')) != NULL)
    ++cp;
  else {
    if ((cp = strrchr(ifname, '\\')) != NULL)
      ++cp;
    else
      cp = ifname;
  }
  strcpy(buf, cp);
  for (p = buf; *p != '\0'; ++p)
    if (!isalnum(*p))
      *p = '_';
  fprintf(ofile, "#ifndef %s_H\n#define %s_H\nstatic %sunsigned char %s[] = {\n",
         str2upr(buf), str2upr(buf), useconst ? "const " : "", buf);
  int c, col = 1;
  while ((c = myfgetc(ifile)) != EOF) {
    if (col >= 78 - 6) {
      fputc('\n', ofile);
      col = 1;
    }
    fprintf(ofile, "0x%.2x, ", c);
    col += 6;
 
  }
  fprintf(ofile, "\n};\n#endif\n");
 
  fclose(ifile);
  fclose(ofile);
}
 
void usage(void)
{
  fprintf(stderr, "usage: bin2c [-cz] <input_file> <output_file>\n");
  exit(1);
}
 
int main(int argc, char **argv)
{
  while (argc > 3) {
    if (!strcmp(argv[1], "-c")) {
      useconst = 1;
      --argc;
      ++argv;
    } else if (!strcmp(argv[1], "-z")) {
      zeroterminated = 1;
      --argc;
      ++argv;
    } else {
      usage();
    }
  }
  if (argc != 3) {
    usage();
  }
  process(argv[1], argv[2]);
  return 0;
}