246 lines
5.3 KiB
C
246 lines
5.3 KiB
C
/* -*- c-file-style: "linux";indent-tabs-mode:t -*- */
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/* Copyright (C) 2017 Jeremiah Orians
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* Copyright (C) 2017 Jan Nieuwenhuizen <janneke@gnu.org>
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* This file is part of mescc-tools
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*
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* mescc-tools is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* mescc-tools is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with mescc-tools. If not, see <http://www.gnu.org/licenses/>.
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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 <getopt.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#define max_string 4096
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//CONSTANT max_string 4096
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#define TRUE 1
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//CONSTANT TRUE 1
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#define FALSE 0
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//CONSTANT FALSE 0
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void file_print(char* s, FILE* f);
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int match(char* a, char* b);
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struct entry
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{
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struct entry* next;
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char* name;
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};
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FILE* output;
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struct entry* jump_table;
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void consume_token(FILE* source_file, char* s)
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{
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int i = 0;
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int c = fgetc(source_file);
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do
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{
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s[i] = c;
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i = i + 1;
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c = fgetc(source_file);
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} while((' ' != c) && ('\t' != c) && ('\n' != c) && '>' != c);
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}
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void storeLabel(FILE* source_file)
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{
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struct entry* entry = calloc(1, sizeof(struct entry));
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/* Prepend to list */
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entry->next = jump_table;
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jump_table = entry;
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/* Store string */
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entry->name = calloc((max_string + 1), sizeof(char));
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consume_token(source_file, entry->name);
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/* Remove all entries that start with the forbidden char pattern :_ */
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if('_' == entry->name[0])
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{
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jump_table = jump_table->next;
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}
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}
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void line_Comment(FILE* source_file)
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{
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int c = fgetc(source_file);
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while((10 != c) && (13 != c))
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{
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c = fgetc(source_file);
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}
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}
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void purge_string(FILE* source_file)
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{
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int c = fgetc(source_file);
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while((EOF != c) && (34 != c))
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{
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c = fgetc(source_file);
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}
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}
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void first_pass(struct entry* input)
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{
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if(NULL == input) return;
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first_pass(input->next);
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FILE* source_file = fopen(input->name, "r");
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if(NULL == source_file)
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{
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file_print("The file: ", stderr);
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file_print(input->name, stderr);
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file_print(" can not be opened!\n", stderr);
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exit(EXIT_FAILURE);
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}
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int c;
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for(c = fgetc(source_file); EOF != c; c = fgetc(source_file))
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{
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/* Check for and deal with label */
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if(58 == c)
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{
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storeLabel(source_file);
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}
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/* Check for and deal with line comments */
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else if (c == '#' || c == ';')
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{
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line_Comment(source_file);
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}
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else if (34 == c)
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{
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purge_string(source_file);
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}
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}
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fclose(source_file);
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}
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void output_debug(struct entry* node, int stage)
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{
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struct entry* i;
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for(i = node; NULL != i; i = i->next)
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{
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if(stage)
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{
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file_print(":ELF_str_", output);
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file_print(i->name, output);
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file_print("\n\x22", output);
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file_print(i->name, output);
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file_print("\x22\n", output);
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}
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else
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{
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file_print("%ELF_str_", output);
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file_print(i->name, output);
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file_print(">ELF_str\n&", output);
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file_print(i->name, output);
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file_print("\n%10000\n!2\n!0\n@1\n", output);
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}
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}
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}
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struct entry* reverse_list(struct entry* head)
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{
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struct entry* root = NULL;
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struct entry* next;
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while(NULL != head)
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{
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next = head->next;
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head->next = root;
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root = head;
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head = next;
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}
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return root;
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}
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/* Standard C main program */
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int main(int argc, char **argv)
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{
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jump_table = NULL;
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struct entry* input = NULL;
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output = stdout;
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char* output_file = "";
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int option_index = 1;
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while(option_index <= argc)
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{
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if(NULL == argv[option_index])
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{
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option_index = option_index + 1;
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}
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else if(match(argv[option_index], "-h") || match(argv[option_index], "--help"))
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{
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file_print("Usage: ", stderr);
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file_print(argv[0], stderr);
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file_print(" -f FILENAME1 {-f FILENAME2}\n", stderr);
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exit(EXIT_SUCCESS);
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}
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else if(match(argv[option_index], "-f") || match(argv[option_index], "--file"))
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{
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struct entry* temp = calloc(1, sizeof(struct entry));
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temp->name = argv[option_index + 1];
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temp->next = input;
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input = temp;
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option_index = option_index + 2;
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}
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else if(match(argv[option_index], "-o") || match(argv[option_index], "--output"))
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{
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output_file = argv[option_index + 1];
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output = fopen(output_file, "w");
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if(NULL == output)
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{
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file_print("The file: ", stderr);
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file_print(input->name, stderr);
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file_print(" can not be opened!\n", stderr);
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exit(EXIT_FAILURE);
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}
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option_index = option_index + 2;
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}
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else if(match(argv[option_index], "-V") || match(argv[option_index], "--version"))
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{
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file_print("blood-elf 0.1\n(Basically Launches Odd Object Dump ExecutabLe Files\n", stdout);
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exit(EXIT_SUCCESS);
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}
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else
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{
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file_print("Unknown option\n", stderr);
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exit(EXIT_FAILURE);
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}
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}
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/* Make sure we have a program tape to run */
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if (NULL == input)
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{
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return EXIT_FAILURE;
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}
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/* Get all of the labels */
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first_pass(input);
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/* Reverse their order */
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jump_table = reverse_list(jump_table);
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file_print(":ELF_str\n!0\n", output);
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output_debug(jump_table, TRUE);
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file_print("%0\n:ELF_sym\n%0\n%0\n%0\n!0\n!0\n@1\n", output);
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output_debug(jump_table, FALSE);
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file_print("\n:ELF_end\n", output);
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return EXIT_SUCCESS;
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}
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