mirror of
https://github.com/nanochess/pretty6502.git
synced 2024-06-02 06:41:33 +00:00
337 lines
7.8 KiB
C
337 lines
7.8 KiB
C
/*
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** Pretty6502
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**
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** by Oscar Toledo G.
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**
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** © Copyright 2017 Oscar Toledo G.
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**
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** Creation date: Nov/03/2017.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#define VERSION "v0.1"
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int tabs;
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/*
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** Request space in line
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*/
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void request_space(FILE *output, int *current, int new, int force)
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{
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/*
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** If already exceeded space...
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*/
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if (*current >= new) {
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if (force)
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fputc(' ', output);
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(*current)++;
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return;
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}
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/*
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** Advance one step at a time
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*/
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while (1) {
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if (tabs == 0) {
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fprintf(output, "%*s", new - *current, "");
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*current = new;
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} else {
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fputc('\t', output);
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*current = (*current + tabs) / tabs * tabs;
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}
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if (*current >= new)
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return;
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}
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}
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/*
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** Main program
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*/
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int main(int argc, char *argv[])
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{
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int c;
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int style;
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int start_mnemonic;
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int start_operand;
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int start_comment;
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int align_comment;
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FILE *input;
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FILE *output;
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int allocation;
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char *data;
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char *p;
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char *p1;
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char *p2;
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int current_column;
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int request;
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/*
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** Show usage if less than 3 arguments (program name counts as one)
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*/
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if (argc < 3) {
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fprintf(stderr, "\n");
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fprintf(stderr, "Pretty6502 " VERSION " by Oscar Toledo G. http://nanochess.org/\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Usage:\n");
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fprintf(stderr, " pretty6502 [args] input.asm output.asm\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "DON'T USE SAME OUTPUT FILE AS INPUT, though it's possible,\n");
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fprintf(stderr, "you can DAMAGE YOUR SOURCE if this program has bugs.\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Arguments:\n");
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fprintf(stderr, " -s0 Code in four columns (default)\n");
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fprintf(stderr, " label: mnemonic operand comment\n");
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fprintf(stderr, " -s1 Code in three columns\n");
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fprintf(stderr, " label: mnemonic+operand comment\n");
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fprintf(stderr, " -m8 Start of mnemonic column (default)\n");
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fprintf(stderr, " -o16 Start of operand column (default)\n");
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fprintf(stderr, " -c32 Start of comment column (default)\n");
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fprintf(stderr, " -t8 Use tabs of size 8 to reach column\n");
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fprintf(stderr, " -t0 Use spaces to align (default)\n");
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fprintf(stderr, " -a0 Align comments to nearest column\n");
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fprintf(stderr, " -a1 Comments at line start are aligned\n");
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fprintf(stderr, " to mnemonic (default)\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Assumes all your labels are at start of line and there is space\n");
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fprintf(stderr, "before mnemonic.\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Accepts any assembler file where ; means comment\n");
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fprintf(stderr, "[label] mnemonic [operand] ; comment\n");
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exit(1);
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}
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/*
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** Default settings
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*/
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style = 0;
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start_mnemonic = 8;
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start_operand = 16;
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start_comment = 32;
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tabs = 0;
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align_comment = 1;
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/*
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** Process arguments
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*/
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c = 1;
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while (c < argc - 2) {
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if (argv[c][0] != '-') {
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fprintf(stderr, "Bad argument\n");
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exit(1);
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}
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switch (argv[c][1]) {
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case 's': /* Style */
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style = atoi(&argv[c][2]);
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if (style != 0 && style != 1) {
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fprintf(stderr, "Bad style code: %d\n", style);
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exit(1);
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}
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break;
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case 'm': /* Mnemonic start */
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start_mnemonic = atoi(&argv[c][2]);
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break;
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case 'o': /* Operand start */
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start_operand = atoi(&argv[c][2]);
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break;
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case 'c': /* Comment start */
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start_comment = atoi(&argv[c][2]);
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break;
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case 't': /* Tab size */
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tabs = atoi(&argv[c][2]);
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break;
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case 'a': /* Comment alignment */
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align_comment = atoi(&argv[c][2]);
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if (align_comment != 0 && align_comment != 1) {
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fprintf(stderr, "Bad comment alignment: %d\n", align_comment);
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exit(1);
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}
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break;
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default: /* Other */
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fprintf(stderr, "Unknown argument: %c\n", argv[c][1]);
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exit(1);
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}
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c++;
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}
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/*
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** Validate constraints
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*/
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if (style == 1) {
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if (start_mnemonic > start_comment) {
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fprintf(stderr, "Operand error: -m%d > -c%d\n", start_mnemonic, start_comment);
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exit(1);
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}
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start_operand = start_mnemonic;
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} else if (style == 0) {
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if (start_mnemonic > start_operand) {
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fprintf(stderr, "Operand error: -m%d > -o%d\n", start_mnemonic, start_operand);
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exit(1);
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}
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if (start_operand > start_comment) {
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fprintf(stderr, "Operand error: -o%d > -c%d\n", start_operand, start_comment);
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exit(1);
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}
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}
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if (tabs > 0) {
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if (start_mnemonic % tabs) {
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fprintf(stderr, "Operand error: -m%d isn't a multiple of %d\n", start_mnemonic, tabs);
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exit(1);
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}
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if (start_operand % tabs) {
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fprintf(stderr, "Operand error: -m%d isn't a multiple of %d\n", start_operand, tabs);
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exit(1);
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}
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if (start_comment % tabs) {
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fprintf(stderr, "Operand error: -m%d isn't a multiple of %d\n", start_comment, tabs);
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exit(1);
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}
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}
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/*
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** Open input file, measure it and read it into buffer
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*/
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input = fopen(argv[c], "rb");
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if (input == NULL) {
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fprintf(stderr, "Unable to open input file: %s\n", argv[c]);
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exit(1);
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}
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fprintf(stderr, "Processing %s...\n", argv[c]);
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fseek(input, 0, SEEK_END);
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allocation = ftell(input);
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data = malloc(allocation + sizeof(char));
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if (data == NULL) {
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fprintf(stderr, "Unable to allocate memory\n");
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fclose(input);
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exit(1);
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}
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fseek(input, 0, SEEK_SET);
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if (fread(data, sizeof(char), allocation, input) != allocation) {
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fprintf(stderr, "Something went wrong reading the input file\n");
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fclose(input);
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free(data);
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exit(1);
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}
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fclose(input);
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/*
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** Ease processing of input file
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*/
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request = 0;
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p1 = data;
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p2 = data;
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while (p1 < data + allocation) {
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if (*p1 == '\r') { /* Ignore \r characters */
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p1++;
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continue;
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}
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if (*p1 == '\n') {
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p1++;
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*p2++ = '\0'; /* Break line */
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request = 1;
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continue;
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}
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*p2++ = *p1++;
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request = 0;
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}
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if (request == 0)
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*p2++ = '\0'; /* Force line break */
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allocation = p2 - data;
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/*
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** Now generate output file
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*/
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c++;
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output = fopen(argv[c], "w");
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if (output == NULL) {
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fprintf(stderr, "Unable to open output file: %s\n", argv[c]);
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exit(1);
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}
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p = data;
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while (p < data + allocation) {
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current_column = 0;
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p1 = p;
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if (*p1 && !isspace(*p1) && *p1 != ';') { /* Label */
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while (*p1 && !isspace(*p1) && *p1 != ';')
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p1++;
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fwrite(p, sizeof(char), p1 - p, output);
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current_column = p1 - p;
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} else {
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current_column = 0;
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}
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while (*p1 && isspace(*p1))
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p1++;
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if (*p1 && *p1 != ';') { /* Mnemonic */
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if (*p1 == '=')
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request = start_operand;
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else
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request = start_mnemonic;
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request_space(output, ¤t_column, request, 1);
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p2 = p1;
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while (*p2 && !isspace(*p2))
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p2++;
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fwrite(p1, sizeof(char), p2 - p1, output);
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current_column += p2 - p1;
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p1 = p2;
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while (*p1 && isspace(*p1))
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p1++;
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if (*p1 && *p1 != ';') { /* Operand */
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request = start_operand;
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request_space(output, ¤t_column, request, 1);
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p2 = p1;
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while (*p2 && *p2 != ';') {
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if (*p2 == '"') {
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p2++;
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while (*p2 && *p2 != '"')
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p2++;
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p2++;
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} else if (*p2 == '\'') {
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p2++;
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while (*p2 && *p2 != '"')
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p2++;
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p2++;
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} else {
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p2++;
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}
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}
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while (p2 > p1 && isspace(*(p2 - 1)))
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p2--;
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fwrite(p1, sizeof(char), p2 - p1, output);
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current_column += p2 - p1;
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p1 = p2;
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while (*p1 && isspace(*p1))
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p1++;
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}
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}
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if (*p1 == ';') { /* Comment */
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if (current_column == 0)
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request = 0;
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else if (current_column < start_mnemonic)
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request = start_mnemonic;
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else
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request = start_comment;
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if (current_column == 0 && align_comment == 1)
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request = start_mnemonic;
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request_space(output, ¤t_column, request, 0);
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p2 = p1;
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while (*p2)
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p2++;
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while (p2 > p1 && isspace(*(p2 - 1)))
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p2--;
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fwrite(p1, sizeof(char), p2 - p1, output);
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fputc('\n', output);
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current_column += p2 - p1;
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while (*p++) ;
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continue;
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}
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fputc('\n', output);
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while (*p++) ;
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}
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fclose(output);
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free(data);
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exit(0);
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}
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