🚀 go-pugleaf

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/* Program to create a binary file from a hex file.
   by Moshe braner, 860606.

   Will read data with any amount of parsing characters between
    the hex codes (including none).
   Rest of a line after a '*' is regarded as a comment.
   Can be used to create keyboard translation tables, etc.
*/

#include <stdio.h>

#define  ishex(c)  ((c>='0'&&c<='9')||(c>='A'&&c<='F')||(c>='a'&&c<='f'))

/* the following macro assumes ishex(c) and ASCII: */
#define  hexval(c) ((c<'A')?(c-'0'):((c<'a')?(c-'A'+0xA):(c-'a'+0xA)))

main() {
	register int c, b, n;
	FILE *infp, *outfp;
	char infname[80], outfname[80];

	printf("\n\nHex To Binary conversion program.  MB 8606.\n\n");
	printf("Enter name of source file: ",stdout);
	gets(infname);
	if ((infp=fopen(infname,"r")) == NULL) {
		printf("cannot open source file!\n");
		exit(0);
	}
	printf("Enter name of output file: ");
	gets(outfname);
	/* open file with "bw" to avoid translation of '\n's
	   to \r\n by Megamax library
	*/
	if ((outfp=fopen(outfname,"bw")) == NULL) {
		printf("cannot open output file!\n");
		exit(0);
	}
	n = 0;
	while ((c=getc(infp)) != EOF) {
		/* rest of line after '*' is a comment: */
		if (c == '*') {
			while ((c=getc(infp)) != '\n' && c != EOF);
			continue;
		}
		/* read one or two characters for one output byte: */
		if (ishex(c)) {
			b = hexval(c);
			if ((c=getc(infp)) == EOF)
				break;
			if (ishex(c))
				b = 16*b + hexval(c);
			if (putc(b,outfp) != b) {
				printf("error writing file!\n");
				exit(0);
			}
			n++;
		}
	}
	printf("\nWrote %d bytes.\n", n);
}

/* - Moshe Braner, Cornell, 607-255-3498 */