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/**
@file format.cpp
@author Morgan McGuire, graphics3d.com
@created 2000-09-09
@edited 2006-08-14
*/
#include "G3D/format.h"
#include "G3D/platform.h"
#include "G3D/System.h"
#ifdef _MSC_VER
// disable: "C++ exception handler used"
# pragma warning (push)
# pragma warning (disable : 4530)
#endif // _MSC_VER
// If your platform does not have vsnprintf, you can find a
// implementation at http://www.ijs.si/software/snprintf/
namespace G3D {
std::string __cdecl format(const char* fmt,...) {
va_list argList;
va_start(argList,fmt);
std::string result = vformat(fmt, argList);
va_end(argList);
return result;
}
#if defined(_MSC_VER) && (_MSC_VER >= 1300)
// Both MSVC seems to use the non-standard vsnprintf
// so we are using vscprintf to determine buffer size, however
// only MSVC7 and up headers include vscprintf for some reason.
std::string vformat(const char *fmt, va_list argPtr) {
// We draw the line at a 1MB string.
const int maxSize = 1000000;
// If the string is less than 161 characters,
// allocate it on the stack because this saves
// the malloc/free time.
const int bufSize = 161;
char stackBuffer[bufSize];
// MSVC does not support va_copy
int actualSize = _vscprintf(fmt, argPtr) + 1;
if (actualSize > bufSize) {
// Now use the heap.
char* heapBuffer = NULL;
if (actualSize < maxSize) {
heapBuffer = (char*)System::malloc(maxSize + 1);
_vsnprintf(heapBuffer, maxSize, fmt, argPtr);
heapBuffer[maxSize] = '\0';
} else {
heapBuffer = (char*)System::malloc(actualSize);
vsprintf(heapBuffer, fmt, argPtr);
}
std::string formattedString(heapBuffer);
System::free(heapBuffer);
return formattedString;
} else {
vsprintf(stackBuffer, fmt, argPtr);
return std::string(stackBuffer);
}
}
#elif defined(_MSC_VER) && (_MSC_VER < 1300)
std::string vformat(const char *fmt, va_list argPtr) {
// We draw the line at a 1MB string.
const int maxSize = 1000000;
// If the string is less than 161 characters,
// allocate it on the stack because this saves
// the malloc/free time.
const int bufSize = 161;
char stackBuffer[bufSize];
// MSVC6 doesn't support va_copy, however it also seems to compile
// correctly if we just pass our argument list along. Note that
// this whole code block is only compiled if we're on MSVC6 anyway
int actualWritten = _vsnprintf(stackBuffer, bufSize, fmt, argPtr);
// Not a big enough buffer, bufSize characters written
if (actualWritten == -1) {
int heapSize = 512;
double powSize = 1.0;
char* heapBuffer = (char*)System::malloc(heapSize);
while ((_vsnprintf(heapBuffer, heapSize, fmt, argPtr) == -1) &&
(heapSize < maxSize)) {
heapSize = iCeil(heapSize * ::pow((double)2.0, powSize++));
heapBuffer = (char*)System::realloc(heapBuffer, heapSize);
}
heapBuffer[heapSize-1] = '\0';
std::string heapString(heapBuffer);
System::free(heapBuffer);
return heapString;
} else {
return std::string(stackBuffer);
}
}
#else
// glibc 2.1 has been updated to the C99 standard
std::string vformat(const char* fmt, va_list argPtr) {
// If the string is less than 161 characters,
// allocate it on the stack because this saves
// the malloc/free time. The number 161 is chosen
// to support two lines of text on an 80 character
// console (plus the null terminator).
const int bufSize = 161;
char stackBuffer[bufSize];
va_list argPtrCopy;
va_copy(argPtrCopy, argPtr);
int numChars = vsnprintf(stackBuffer, bufSize, fmt, argPtrCopy);
va_end(argPtrCopy);
if (numChars >= bufSize) {
// We didn't allocate a big enough string.
char* heapBuffer = (char*)System::malloc((numChars + 1) * sizeof(char));
debugAssert(heapBuffer);
int numChars2 = vsnprintf(heapBuffer, numChars + 1, fmt, argPtr);
debugAssert(numChars2 == numChars);
(void)numChars2;
std::string result(heapBuffer);
System::free(heapBuffer);
return result;
} else {
return std::string(stackBuffer);
}
}
#endif
} // namespace
#ifdef _MSC_VER
# pragma warning (pop)
#endif
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