/* Generates BUZBEE command hash data table asm file */

#include <stdint.h>
#include <stdio.h>

/* Length of commands in printable-char count (excluding NUL terminator). */
const int s_cchCmd = 4;

/* Add your commands here to be hashed. Imprtant that they all be CCH_CMD
 * chars long EXCLUDING the NUL terminator. Order is important here. */
const char *s_ppszCmds[] = {
	"CALL",
	"HELP",
	"PEEK",
	"POKE",
	"SREC",
	/* "BOOT", */
};

int mkHash(const char pszCmd[]);

int main(void) {
	/* Emit file header */
	puts("; CHIBI PC-09 -- BUZBEE -- Command Hash Table\n\
; Copyright (c) 2025 Gale Faraday\n\
; Licensed under MIT\n\
\n\
; This file generated by bbmkhash.c\n\
\n\
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\n\
;;\n\
;; BUZBEE Command Hash Table\n\
;;\n\
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\n\
\n\
  SECTION BBHASHES\n\
\n\
  EXPORT BBCHTC\n\
  EXPORT BBCHT\n");

	/* Command count.
	* NOTE: This is a u16 because it gets emitted into the output assembly. */
	uint16_t cCmds = sizeof(s_ppszCmds) / sizeof(char *);

	/* Emit command count */
	printf("BBCHTC\n  fdb $%.4X\n", cCmds);

	/* Emit table data */
	puts("\nBBCHT");
	for (int iCmd = 0; iCmd < cCmds; iCmd++) {
		uint8_t uHash = mkHash(s_ppszCmds[iCmd]);
		printf("  fcb $%.2X\n", uHash);
	}

	return 0;
}

int mkHash(const char pszCmd[]) {
	uint8_t nhash = 0;

	/* NOTE: Very important that condition is the length of the string MINUS the
	 * NUL terminator, in this case iChar < 4 */
	for (int iChar = 0; iChar < s_cchCmd; iChar++)
		nhash = nhash - pszCmd[iChar];

	return nhash;
}