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/*
This class can waits for input on different istreams
Copyright (C) 1998 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#include "multiReader.h"
MultiReader::MultiReader() {
int i;
buffer=new Buffer(201);
for(i=0;i<_MAX_INPUT;i++) {
lineInputArray[i]=new LineInput;
lineInputArray[i]->tmpLineStack=new LineStack();
lineInputArray[i]->empty=true;
}
script=new LineStack();
}
MultiReader::~MultiReader() {
int i;
for(i=0;i<_MAX_INPUT;i++) {
delete lineInputArray[i]->tmpLineStack;
delete lineInputArray[i];
}
delete script;
}
int MultiReader::add(int fd) {
int nPos;
nPos=getEmptySlot();
if (nPos == -1) {
return -1;
}
lineInputArray[nPos]->fd=fd;
lineInputArray[nPos]->empty=false;
return nPos;
}
void MultiReader::add(LineStack* aScript) {
script->appendBottom(aScript);
}
void MultiReader::add(Buffer* aScript) {
script->appendBottom(aScript->getData(),aScript->len());
}
void MultiReader::remove (int fd) {
int nPos;
nPos=getSlot(fd);
if (nPos == -1) {
return ;
}
lineInputArray[nPos]->empty=true;
}
void MultiReader::waitForLine() {
while(hasLine() == false) {
doSelect(NULL);
}
}
void MultiReader::poll(struct timeval* timeout) {
doSelect(timeout);
}
void MultiReader::doSelect(struct timeval* timeout) {
int i;
int ret;
fd_set readfds;
int nBytes;
int maxFd=0;
FD_ZERO(&readfds);
for(i=0;i<_MAX_INPUT;i++) {
if (lineInputArray[i]->empty == false) {
FD_SET(lineInputArray[i]->fd,&readfds);
if (lineInputArray[i]->fd > maxFd) {
maxFd=lineInputArray[i]->fd;
}
}
}
ret=select(maxFd+1,&readfds,NULL,NULL,timeout);
if (ret < 0) {
if (errno < 0) {
perror("nach select multireader:");
exit(0);
}
}
if (ret == 0) return;
for(i=0;i<_MAX_INPUT;i++) {
if (lineInputArray[i]->empty == false) {
if (FD_ISSET(lineInputArray[i]->fd,&readfds)) {
nBytes=read(lineInputArray[i]->fd,buffer->getData(),200);
if (nBytes == 0) {
perror("MultiReader:read error!");
exit(-1);
}
(buffer->getData())[nBytes]='\0';
lineInputArray[i]->tmpLineStack->appendBottom(buffer->getData(),
nBytes);
FD_CLR(lineInputArray[i]->fd,&readfds);
}
}
}
}
int MultiReader::hasLine() {
int i;
LineStack* lineStack; // owned by class
if (script->hasLine() == true) {
return true;
}
for(i=0;i<_MAX_INPUT;i++) {
if (lineInputArray[i]->empty == false) {
lineStack=lineInputArray[i]->tmpLineStack;
if (lineStack->hasLine()) {
return true;
}
}
}
return false;
}
void MultiReader::getLine(Buffer* buffer) {
int i;
LineStack* lineStack; // owned by class
buffer->clear();
if (script->hasLine()==true) {
script->nextLine(buffer);
} else {
for(i=0;i<_MAX_INPUT;i++) {
if (lineInputArray[i]->empty == false) {
lineStack=lineInputArray[i]->tmpLineStack;
if (lineStack->hasLine()) {
lineStack->nextLine(buffer);
return;
}
}
}
}
buffer->append("\n");
}
int MultiReader::getEmptySlot() {
int i;
for(i=0;i<_MAX_INPUT;i++) {
if (lineInputArray[i]->empty == true) {
return i;
}
}
return -1;
}
int MultiReader::getSlot(int fd) {
int i;
for(i=0;i<_MAX_INPUT;i++) {
if (lineInputArray[i]->empty == false) {
if (lineInputArray[i]->fd == fd) {
return i;
}
}
}
return -1;
}
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