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Add an optional value parameter to -p (lmod)

--- a/src/fix/main.c

+++ b/src/fix/main.c

@@ -132,6 +132,7 @@

 	char filename[512];

 	char cartname[32];

 	FILE *f;

+	int pad_value = 0;

 	ulOptions = 0;

@@ -150,6 +151,13 @@

 				break;

 			case 'p':

 				ulOptions |= OPTF_PAD;

+				if (strlen(argv[argn] + 2) > 0 && strlen(argv[argn] + 2) <= 2) {

+					int result;

+					result = sscanf(argv[argn] + 2, "%x", &pad_value);

+					if (!((result == EOF) || (result == 1))) {

+						FatalError("Invalid argument for option 'p'");

+					}

+				}

 				break;

 			case 'r':

 				ulOptions |= OPTF_TRUNCATE;

@@ -203,7 +211,7 @@

 				padto *= 2;

 			if (!(ulOptions & OPTF_QUIET)) {

-				printf("Padding to %ldkB:\n", padto / 1024);

+				printf("Padding to %ldkB with pad value %#02X\n", padto / 1024, pad_value & 0xFF);

 			}

 			/*

 			   if( padto<=0x80000L )

@@ -216,7 +224,7 @@

 				while (size < padto) {

 					size += 1;

 					if ((ulOptions & OPTF_DEBUG) == 0)

-						fputc(0, f);

+						fputc(pad_value & 0xFF, f);

 					bytesadded += 1;

 				}

 				fflush(f);