ref: bb58e40a23c68f51f396babe10db7a6e62cf67f3
dir: /src/doom/deh_io.c/
// Emacs style mode select -*- C++ -*- //----------------------------------------------------------------------------- // // Copyright(C) 2005 Simon Howard // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA // 02111-1307, USA. // //----------------------------------------------------------------------------- // // Dehacked I/O code (does all reads from dehacked files) // //----------------------------------------------------------------------------- #include <stdarg.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "i_system.h" #include "z_zone.h" #include "deh_defs.h" #include "deh_io.h" struct deh_context_s { FILE *stream; char *filename; int linenum; boolean last_was_newline; char *readbuffer; int readbuffer_size; }; // Open a dehacked file for reading // Returns NULL if open failed deh_context_t *DEH_OpenFile(char *filename) { FILE *fstream; deh_context_t *context; fstream = fopen(filename, "r"); if (fstream == NULL) return NULL; context = Z_Malloc(sizeof(*context), PU_STATIC, NULL); context->stream = fstream; // Initial read buffer size of 128 bytes context->readbuffer_size = 128; context->readbuffer = Z_Malloc(context->readbuffer_size, PU_STATIC, NULL); context->filename = filename; context->linenum = 0; context->last_was_newline = true; return context; } // Close dehacked file void DEH_CloseFile(deh_context_t *context) { fclose(context->stream); Z_Free(context->readbuffer); Z_Free(context); } // Reads a single character from a dehacked file int DEH_GetChar(deh_context_t *context) { int result; // Read characters, but ignore carriage returns // Essentially this is a DOS->Unix conversion do { if (feof(context->stream)) { // end of file result = -1; } else { result = fgetc(context->stream); } } while (result == '\r'); // Track the current line number if (context->last_was_newline) { ++context->linenum; } context->last_was_newline = result == '\n'; return result; } // Increase the read buffer size static void IncreaseReadBuffer(deh_context_t *context) { char *newbuffer; int newbuffer_size; newbuffer_size = context->readbuffer_size * 2; newbuffer = Z_Malloc(newbuffer_size, PU_STATIC, NULL); memcpy(newbuffer, context->readbuffer, context->readbuffer_size); Z_Free(context->readbuffer); context->readbuffer = newbuffer; context->readbuffer_size = newbuffer_size; } // Read a whole line char *DEH_ReadLine(deh_context_t *context) { int c; int pos; for (pos = 0;;) { c = DEH_GetChar(context); if (c < 0) { // end of file return NULL; } // cope with lines of any length: increase the buffer size if (pos >= context->readbuffer_size) { IncreaseReadBuffer(context); } if (c == '\n') { // end of line: a full line has been read context->readbuffer[pos] = '\0'; break; } else if (c != '\0') { // normal character; don't allow NUL characters to be // added. context->readbuffer[pos] = (char) c; ++pos; } } return context->readbuffer; } void DEH_Warning(deh_context_t *context, char *msg, ...) { va_list args; va_start(args, msg); fprintf(stderr, "%s:%i: warning: ", context->filename, context->linenum); vfprintf(stderr, msg, args); fprintf(stderr, "\n"); va_end(args); } void DEH_Error(deh_context_t *context, char *msg, ...) { va_list args; va_start(args, msg); fprintf(stderr, "%s:%i: ", context->filename, context->linenum); vfprintf(stderr, msg, args); fprintf(stderr, "\n"); va_end(args); I_Error("Error parsing dehacked file"); }