/* chartest.c
 * (C) Will Dyke, 2002
 *
 * chartest goes through an objdump of a file, and outputs all lines
 * containing a compare of a constant (of the form $0x12ab) to something
 * e.g. register, memory address, whatever.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 *
 *
 */

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

int main(int argc, char* argv[]) {

	char address[10], instruction[10], operands[30], *pch, s[30];
	char linebuf[300];
	int num;
	FILE *fptr= stdin;
	char *usage = "Usage: %s [filename]\n";

switch (argc) {
case 1:
fptr = stdin;
	  	break;
	  case 2:
		if (!(fptr = fopen(argv[1], "r"))) {
	      fprintf(stderr,"Couldn't open %s for reading\n", argv[1]);
	      exit(1);
	    }
	    break;
	  default:
	  	printf(usage, argv[0]);
	  	exit(2);
  }

  pch = linebuf;

	  while (*pch = fgetc(fptr)) {
	  int i= 0;

	  if (*pch == EOF) {
		  break;
	  }
	  if (*pch == '\n') {
		  *pch = '\0';
		  pch = linebuf;
	  }
      else {
		  pch++;
		  continue;
	  }

	/* We're looking for lines with three fields only (address, instruction and operands),
	 * where the instruction matches cmp.*, and where the first operand is a constant
	 */

	if (sscanf(linebuf, "%s %s %s %s", address, instruction, operands, s)==3 &&
        !strncmp(instruction, "cmp", 3) && operands[0] == '$') {

      for (pch= operands+1; *pch!=','; pch++) {
        s[i++] = *pch;
      }
      s[i]='\0';
      num = strtol(s, NULL, 16);

	  /* We're only looking for compares with what
	   * look like a typical ASCII printable character
	   */
	  if (num >= 0x20 && num < 0x80) {
        printf("%s %s\t%c%s\n", address, instruction, num,pch);
      }
    }
    pch = linebuf;
  }
}