/*
  test.c
  Change ^^ab in foo.ind into an unsigned char without test
  Usage: test foo.ind
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define  TMPNAM "ind-tmp-x.xxx"

unsigned char tohex(unsigned char c)
{
  unsigned char ret;
  if(c >= 'a' && c <= 'f')
    ret = c - 'a' + 10;
  else if(c >= '0' && c <= '9')
    ret = c - '0';

  return ret;
}

int main(int argc, char **argv)
{
  FILE *fin, *fout;
  unsigned char ibuff[4096], obuff[4096];
  unsigned char *p, *q;
  fin = fopen(argv[1], "r");
  fout = fopen(TMPNAM, "w");
  while(fgets(ibuff, 4094, fin)) {
    p = ibuff;
    q = obuff;
    while(*p) {
      if(strncmp(p, "^^", 2) == 0) {
	p += 2;
	*q = tohex(*p) * 16;
	p++;
	*q += tohex(*p);
	q++;
	p++;
      } else {
	*q++ = *p++;
      }
    }
    *q = '\0';
    fputs(obuff, fout);
  }
  fclose(fin);
  fclose(fout);
  unlink(argv[1]);
  rename(TMPNAM, argv[1]);
  return 0;
}