PracticeDev/study_cpp/http/LogStream.cpp

//LogStream 
#include <stdio.h> 
#include <assert.h> 
#include <algorithm> 
#include "LogStream.hh" 
 
LogStream::LogStream(){ 
} 
 
LogStream::~LogStream(){ 
} 
 
LogStream& LogStream::operator<<(bool v){ 
    m_buffer.append(v ? "1" : "0", 1); 
    return *this; 
} 
 
 
LogStream& LogStream::operator<<(short v){ 
    *this << static_cast<int>(v); 
    return *this; 
} 
 
LogStream& LogStream::operator<<(unsigned short v) 
{ 
  *this << static_cast<unsigned int>(v); 
  return *this; 
} 
 
LogStream& LogStream::operator<<(int v) 
{ 
  formatInteger(v); 
  return *this; 
} 
 
LogStream& LogStream::operator<<(unsigned int v) 
{ 
  formatInteger(v); 
  return *this; 
} 
 
LogStream& LogStream::operator<<(long v) 
{ 
  formatInteger(v); 
  return *this; 
} 
 
LogStream& LogStream::operator<<(unsigned long v) 
{ 
  formatInteger(v); 
  return *this; 
} 
 
LogStream& LogStream::operator<<(long long v) 
{ 
  formatInteger(v); 
  return *this; 
} 
 
LogStream& LogStream::operator<<(unsigned long long v) 
{ 
  formatInteger(v); 
  return *this; 
} 
 
LogStream& LogStream::operator<<(const void*){ 
    printf("undefine\n"); 
} 
 
LogStream& LogStream::operator<<(float v) 
  { 
    *this << static_cast<double>(v); 
    return *this; 
  } 
 
LogStream& LogStream::operator<<(double v){ 
    if(m_buffer.avail() >= kMaxNumericSize){ 
        int len = snprintf(m_buffer.current(), kMaxNumericSize, "%.12g", v); 
        m_buffer.add(len); 
    } 
    return *this; 
} 
 
LogStream& LogStream::operator<<(char v){ 
    m_buffer.append(&v, 1); 
    return *this; 
} 
 
LogStream& LogStream::operator<<(const char *str){ 
    if(str){ 
        m_buffer.append(str, strlen(str)); 
    }else{ 
        m_buffer.append("(NULL)", 6); 
    } 
 
    return *this; 
} 
 
const char digits[] = "9876543210123456789"; 
const char* zero = digits + 9; 
 
//convert to str 
template<typename T> 
size_t convert(char buf[], T value){ 
    T i = value; 
    char *p = buf; 
 
    do{ 
        int lsd = static_cast<int>(i % 10); 
        i /= 10; 
        *p++ = zero[lsd]; 
    } while(i != 0); 
 
    if(value < 0){ 
        *p++ = '-'; 
    } 
 
    *p = '\0'; 
    std::reverse(buf, p); 
 
    return p - buf; 
} 
 
template<typename T> 
void LogStream::formatInteger(T v) 
{ 
    if(m_buffer.avail() >= kMaxNumericSize){ 
        size_t len = convert(m_buffer.current(), v); 
        m_buffer.add(len); 
    } 
} 
 
template<typename T> 
Fmt::Fmt(const char* fmt, T val) 
{ 
    m_length = snprintf(m_buf, sizeof(m_buf), fmt, val); 
    assert(static_cast<size_t>(m_length) < sizeof(m_buf)); 
} 
 
// Explicit instantiations 
 
template Fmt::Fmt(const char* fmt, char); 
 
template Fmt::Fmt(const char* fmt, short); 
template Fmt::Fmt(const char* fmt, unsigned short); 
template Fmt::Fmt(const char* fmt, int); 
template Fmt::Fmt(const char* fmt, unsigned int); 
template Fmt::Fmt(const char* fmt, long); 
template Fmt::Fmt(const char* fmt, unsigned long); 
template Fmt::Fmt(const char* fmt, long long); 
template Fmt::Fmt(const char* fmt, unsigned long long); 
 
template Fmt::Fmt(const char* fmt, float); 
template Fmt::Fmt(const char* fmt, double);