Add option to disable padding in rgblink

Fixes #307

RGBFIX can handle padding, so there's no reason why
we can't add an option to disable padding in rgblink.

Signed-off-by: JL2210 <larrowe.semaj11@gmail.com>

include/link/main.h

@@ -27,6 +27,7 @@ extern uint8_t padValue;
 extern bool is32kMode;
 extern bool beVerbose;
 extern bool isWRA0Mode;
+extern bool disablePadding;
 
 /* Helper macro for printing verbose-mode messages */
 #define verbosePrint(...)   do { \

src/link/main.c

@@ -34,6 +34,7 @@ uint8_t padValue;             /* -p */
 bool is32kMode;               /* -t */
 bool beVerbose;               /* -v */
 bool isWRA0Mode;              /* -w */
+bool disablePadding;          /* -x */
 
 static uint32_t nbErrors = 0;
 
@@ -83,7 +84,7 @@ FILE *openFile(char const *fileName, char const *mode)
 }
 
 /* Short options */
-static char const *optstring = "dl:m:n:O:o:p:s:tVvw";
+static char const *optstring = "dl:m:n:O:o:p:s:tVvwx";
 
 /*
  * Equivalent long options
@@ -108,6 +109,7 @@ static struct option const longopts[] = {
 	{ "version",      no_argument,       NULL, 'V' },
 	{ "verbose",      no_argument,       NULL, 'v' },
 	{ "wramx",        no_argument,       NULL, 'w' },
+	{ "nopad",        no_argument,       NULL, 'x' },
 	{ NULL,           no_argument,       NULL, 0   }
 };
 
@@ -126,6 +128,7 @@ static void printUsage(void)
 "    -n, --sym <path>           set the output symbol list file\n"
 "    -o, --output <path>        set the output file\n"
 "    -p, --pad <value>          set the value to pad between sections with\n"
+"    -x, --nopad                disable padding of output binary\n"
 "    -V, --version              print RGBLINK version and exits\n"
 "\n"
 "For help, use `man rgblink' or go to https://rednex.github.io/rgbds/\n",
@@ -199,6 +202,11 @@ int main(int argc, char *argv[])
 		case 'w':
 			isWRA0Mode = true;
 			break;
+		case 'x':
+			disablePadding = true;
+			/* implies tiny mode */
+			is32kMode = true;
+			break;
 		default:
 			printUsage();
 			exit(1);

src/link/output.c

@@ -175,9 +175,13 @@ static void writeBank(struct SortedSection *bankSections, uint16_t baseOffset,
 		bankSections = bankSections->next;
 	}
 
-	while (offset < size) {
-		putc(overlayFile ? getc(overlayFile) : padValue, outputFile);
-		offset++;
+	if (!disablePadding) {
+		while (offset < size) {
+			putc(overlayFile ? getc(overlayFile)
+					 : padValue,
+			     outputFile);
+			offset++;
+		}
 	}
 }