barrier/base/CLog.cpp

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#include "CLog.h"
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
#include <assert.h>
//
// CLog
//
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static int g_maxPriority = -1;
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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;
}
// print to buffer
char stack[1024];
va_list args;
va_start(args, fmt);
char* buffer = vsprint(0, stack,
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 + strlen(stack) + 1 + 1;
// print to buffer
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
sprintf(buffer, "%s,%d:", file, line);
buffer[pad - 1] = ' ';
// output buffer
output(priority, buffer);
// clean up
if (buffer != stack)
delete[] buffer;
}
void CLog::output(int priority, const char* msg)
{
static const char* s_priority[] = {
"FATAL",
"ERROR",
"WARNING",
"NOTE",
"INFO",
"DEBUG",
};
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static const int s_numPriority = (int)(sizeof(s_priority) /
sizeof(s_priority[0]));
assert(priority >= 0 && priority < s_numPriority);
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assert(msg != 0);
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if (g_maxPriority == -1) {
g_maxPriority = s_numPriority - 1;
const char* priEnv = getenv("SYN_LOG_PRI");
if (priEnv != NULL) {
for (int i = 0; i < s_numPriority; ++i)
if (strcmp(priEnv, s_priority[i]) == 0) {
g_maxPriority = i;
break;
}
}
}
if (priority <= g_maxPriority)
fprintf(stderr, "%s: %s\n", s_priority[priority], msg);
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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)
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);
return buffer;
}