Annotation of embedaddon/igmpproxy/src/confread.c, revision 1.1
1.1 ! misho 1: /*
! 2: ** igmpproxy - IGMP proxy based multicast router
! 3: ** Copyright (C) 2005 Johnny Egeland <johnny@rlo.org>
! 4: **
! 5: ** This program is free software; you can redistribute it and/or modify
! 6: ** it under the terms of the GNU General Public License as published by
! 7: ** the Free Software Foundation; either version 2 of the License, or
! 8: ** (at your option) any later version.
! 9: **
! 10: ** This program is distributed in the hope that it will be useful,
! 11: ** but WITHOUT ANY WARRANTY; without even the implied warranty of
! 12: ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! 13: ** GNU General Public License for more details.
! 14: **
! 15: ** You should have received a copy of the GNU General Public License
! 16: ** along with this program; if not, write to the Free Software
! 17: ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
! 18: **
! 19: **----------------------------------------------------------------------------
! 20: **
! 21: ** This software is derived work from the following software. The original
! 22: ** source code has been modified from it's original state by the author
! 23: ** of igmpproxy.
! 24: **
! 25: ** smcroute 0.92 - Copyright (C) 2001 Carsten Schill <carsten@cschill.de>
! 26: ** - Licensed under the GNU General Public License, version 2
! 27: **
! 28: ** mrouted 3.9-beta3 - COPYRIGHT 1989 by The Board of Trustees of
! 29: ** Leland Stanford Junior University.
! 30: ** - Original license can be found in the Stanford.txt file.
! 31: **
! 32: */
! 33: /**
! 34: * confread.c
! 35: *
! 36: * Generic config file reader. Used to open a config file,
! 37: * and read the tokens from it. The parser is really simple,
! 38: * and does no backlogging. This means that no form of
! 39: * text escaping and qouting is currently supported.
! 40: * '#' chars are read as comments, and the comment lasts until
! 41: * a newline or EOF
! 42: *
! 43: */
! 44:
! 45: #include "igmpproxy.h"
! 46:
! 47: #define READ_BUFFER_SIZE 512 // Inputbuffer size...
! 48:
! 49: #ifndef MAX_TOKEN_LENGTH
! 50: #define MAX_TOKEN_LENGTH 30 // Default max token length
! 51: #endif
! 52:
! 53: FILE *confFilePtr; // File handle pointer
! 54: char *iBuffer; // Inputbuffer for reading...
! 55: unsigned int bufPtr; // Buffer position pointer.
! 56: unsigned int readSize; // Number of bytes in buffer after last read...
! 57: char cToken[MAX_TOKEN_LENGTH]; // Token buffer...
! 58: short validToken;
! 59:
! 60: /**
! 61: * Opens config file specified by filename.
! 62: */
! 63: int openConfigFile(char *filename) {
! 64:
! 65: // Set the buffer to null initially...
! 66: iBuffer = NULL;
! 67:
! 68: // Open the file for reading...
! 69: confFilePtr = fopen(filename, "r");
! 70:
! 71: // On error, return false
! 72: if(confFilePtr == NULL) {
! 73: return 0;
! 74: }
! 75:
! 76: // Allocate memory for inputbuffer...
! 77: iBuffer = (char*) malloc( sizeof(char) * READ_BUFFER_SIZE );
! 78:
! 79: if(iBuffer == NULL) {
! 80: closeConfigFile();
! 81: return 0;
! 82: }
! 83:
! 84: // Reset bufferpointer and readsize
! 85: bufPtr = 0;
! 86: readSize = 0;
! 87:
! 88: return 1;
! 89: }
! 90:
! 91: /**
! 92: * Closes the currently open config file.
! 93: */
! 94: void closeConfigFile() {
! 95: // Close the file.
! 96: if(confFilePtr!=NULL) {
! 97: fclose(confFilePtr);
! 98: }
! 99: // Free input buffer memory...
! 100: if(iBuffer != NULL) {
! 101: free(iBuffer);
! 102: }
! 103: }
! 104:
! 105: /**
! 106: * Returns the next token from the configfile. The function
! 107: * return NULL if there are no more tokens in the file.
! 108: */
! 109: char *nextConfigToken() {
! 110:
! 111: validToken = 0;
! 112:
! 113: // If no file or buffer, return NULL
! 114: if(confFilePtr == NULL || iBuffer == NULL) {
! 115: return NULL;
! 116: }
! 117:
! 118: {
! 119: unsigned int tokenPtr = 0;
! 120: unsigned short finished = 0;
! 121: unsigned short commentFound = 0;
! 122:
! 123: // Outer buffer fill loop...
! 124: while ( !finished ) {
! 125: // If readpointer is at the end of the buffer, we should read next chunk...
! 126: if(bufPtr == readSize) {
! 127: // Fill up the buffer...
! 128: readSize = fread (iBuffer, sizeof(char), READ_BUFFER_SIZE, confFilePtr);
! 129: bufPtr = 0;
! 130:
! 131: // If the readsize is 0, we should just return...
! 132: if(readSize == 0) {
! 133: return NULL;
! 134: }
! 135: }
! 136:
! 137: // Inner char loop...
! 138: while ( bufPtr < readSize && !finished ) {
! 139:
! 140: //printf("Char %s", iBuffer[bufPtr]);
! 141:
! 142: // Break loop on \0
! 143: if(iBuffer[bufPtr] == '\0') {
! 144: break;
! 145: }
! 146:
! 147: if( commentFound ) {
! 148: if( iBuffer[bufPtr] == '\n' ) {
! 149: commentFound = 0;
! 150: }
! 151: } else {
! 152:
! 153: // Check current char...
! 154: switch(iBuffer[bufPtr]) {
! 155: case '#':
! 156: // Found a comment start...
! 157: commentFound = 1;
! 158: break;
! 159:
! 160: case '\n':
! 161: case '\r':
! 162: case '\t':
! 163: case ' ':
! 164: // Newline, CR, Tab and space are end of token, or ignored.
! 165: if(tokenPtr > 0) {
! 166: cToken[tokenPtr] = '\0'; // EOL
! 167: finished = 1;
! 168: }
! 169: break;
! 170:
! 171: default:
! 172: // Append char to token...
! 173: cToken[tokenPtr++] = iBuffer[bufPtr];
! 174: break;
! 175: }
! 176:
! 177: }
! 178:
! 179: // Check end of token buffer !!!
! 180: if(tokenPtr == MAX_TOKEN_LENGTH - 1) {
! 181: // Prevent buffer overrun...
! 182: cToken[tokenPtr] = '\0';
! 183: finished = 1;
! 184: }
! 185:
! 186: // Next char...
! 187: bufPtr++;
! 188: }
! 189: // If the readsize is less than buffersize, we assume EOF.
! 190: if(readSize < READ_BUFFER_SIZE && bufPtr == readSize) {
! 191: if (tokenPtr > 0)
! 192: finished = 1;
! 193: else
! 194: return NULL;
! 195: }
! 196: }
! 197: if(tokenPtr>0) {
! 198: validToken = 1;
! 199: return cToken;
! 200: }
! 201: }
! 202: return NULL;
! 203: }
! 204:
! 205:
! 206: /**
! 207: * Returns the currently active token, or null
! 208: * if no tokens are availible.
! 209: */
! 210: char *getCurrentConfigToken() {
! 211: return validToken ? cToken : NULL;
! 212: }
! 213:
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