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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "llreader.h"
#include <cstdlib>
#include <cstring>
#include <unistd.h>
namespace ns_log {
InputBuf::InputBuf(int fd)
: _inputfd(fd),
_size(1000),
_buf((char *)malloc(_size)),
_bp(_buf),
_left(_size)
{ }
InputBuf::~InputBuf()
{
free(_buf);
}
bool
InputBuf::hasInput()
{
char *p = _buf;
while (p < _bp) {
if (*p == '\n') return true;
p++;
}
return false;
}
void
InputBuf::doInput(LLParser& via)
{
char *p = _buf;
while (p < _bp) {
if (*p == '\n') {
*p = '\0';
via.doInput(_buf);
++p;
int len = p - _buf;
int movelen = _bp - p;
memmove(_buf, p, movelen);
_bp -= len;
_left += len;
p = _buf;
continue;
}
p++;
}
}
void
InputBuf::extend()
{
_size *= 2;
int pos = _bp - _buf;
char *nbuf = (char *)realloc(_buf, _size);
if (nbuf == NULL) {
free(_buf);
throw MsgException("realloc failed");
}
_buf = nbuf;
_bp = _buf + pos;
_left = _size - pos;
}
bool
InputBuf::blockRead()
{
if (_left < 80) {
extend();
}
ssize_t len = ::read(_inputfd, _bp, _left);
if (len > 0) {
_bp += len;
_left -= len;
// printf("read %d bytes: '%.*s'\n", len, len, _buf);
} else if (len < 0) {
throw MsgException("error reading");
} else {
// EOF on input
return false;
}
return true;
}
void
InputBuf::doAllInput(LLParser &outputvia)
{
while (blockRead()) {
while (hasInput()) {
doInput(outputvia);
}
}
if (_bp != _buf) {
if (_left < 1) extend();
*_bp++ = '\n';
doInput(outputvia);
}
}
} // namespace
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