barrier/base/CLog.cpp

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#include "CLog.h"
#include "BasicTypes.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
#include <assert.h>
#if defined(CONFIG_PLATFORM_WIN32)
#include <windows.h>
#define vsnprintf _vsnprintf
#endif
static int g_maxPriority = -1;
static const char* g_priority[] = {
"FATAL",
"ERROR",
"WARNING",
"NOTE",
"INFO",
"DEBUG",
"DEBUG1",
"DEBUG2"
};
static const int g_numPriority = (int)(sizeof(g_priority) /
sizeof(g_priority[0]));
static const int g_maxPriorityLength = 7; // length of longest string
static const int g_prioritySuffixLength = 2;
static const int g_priorityPad = g_maxPriorityLength +
g_prioritySuffixLength;
static const int g_newlineLength = 2;
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//
// CLog
//
CLog::Outputter CLog::s_outputter = NULL;
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void CLog::print(const char* fmt, ...)
{
// check if fmt begins with a priority argument
int priority = 4;
if (fmt[0] == '%' && fmt[1] == 'z') {
priority = fmt[2] - '\060';
fmt += 3;
}
// compute prefix padding length
int pad = g_priorityPad;
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// print to buffer
char stack[1024];
va_list args;
va_start(args, fmt);
char* buffer = vsprint(pad, stack,
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sizeof(stack) / sizeof(stack[0]), fmt, args);
va_end(args);
// output buffer
output(priority, buffer);
// clean up
if (buffer != stack)
delete[] buffer;
}
void CLog::printt(const char* file, int line,
const char* fmt, ...)
{
// check if fmt begins with a priority argument
int priority = 4;
if (fmt[0] == '%' && fmt[1] == 'z') {
priority = fmt[2] - '\060';
fmt += 3;
}
// compute prefix padding length
char stack[1024];
sprintf(stack, "%d", line);
int pad = strlen(file) + 1 /* comma */ +
strlen(stack) + 1 /* colon */ + 1 /* space */ +
g_priorityPad;
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// print to buffer, leaving space for a newline at the end
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va_list args;
va_start(args, fmt);
char* buffer = vsprint(pad, stack,
sizeof(stack) / sizeof(stack[0]), fmt, args);
va_end(args);
// print the prefix to the buffer. leave space for priority label.
sprintf(buffer + g_priorityPad, "%s,%d:", file, line);
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buffer[pad - 1] = ' ';
// output buffer
output(priority, buffer);
// clean up
if (buffer != stack)
delete[] buffer;
}
void CLog::setOutputter(Outputter outputter)
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{
s_outputter = outputter;
}
void CLog::output(int priority, char* msg)
{
assert(priority >= 0 && priority < g_numPriority);
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assert(msg != 0);
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if (g_maxPriority == -1) {
#if defined(NDEBUG)
g_maxPriority = 4;
#else
g_maxPriority = 5;
#endif
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const char* priEnv = getenv("SYN_LOG_PRI");
if (priEnv != NULL) {
for (int i = 0; i < g_numPriority; ++i)
if (strcmp(priEnv, g_priority[i]) == 0) {
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g_maxPriority = i;
break;
}
}
}
if (priority <= g_maxPriority) {
// insert priority label
int n = strlen(g_priority[priority]);
sprintf(msg + g_maxPriorityLength - n, "%s:", g_priority[priority]);
msg[g_maxPriorityLength + 1] = ' ';
// put a newline at the end
#if defined(CONFIG_PLATFORM_WIN32)
strcat(msg + g_priorityPad, "\r\n");
#else
strcat(msg + g_priorityPad, "\n");
#endif
// print it
if (s_outputter)
s_outputter(msg + g_maxPriorityLength - n);
else
#if defined(CONFIG_PLATFORM_WIN32)
OutputDebugString(msg + g_maxPriorityLength - n);
#else
fprintf(stderr, "%s", msg + g_maxPriorityLength - n);
#endif
}
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}
char* CLog::vsprint(int pad, char* buffer, int len,
const char* fmt, va_list args)
{
assert(len > 0);
// try writing to input buffer
int n;
if (len >= pad) {
n = vsnprintf(buffer + pad, len - pad, fmt, args);
if (n != -1 && n <= len - pad + g_newlineLength)
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return buffer;
}
// start allocating buffers until we write the whole string
buffer = 0;
do {
delete[] buffer;
len *= 2;
buffer = new char[len + pad];
n = vsnprintf(buffer + pad, len - pad, fmt, args);
} while (n == -1 || n > len - pad + g_newlineLength);
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return buffer;
}