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split out the functionality of utohexstr into a new utohex_buffer

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helper.  This allows us to convert numbers to hex without necessarily
needing to make a std::string to hold the result.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58961 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-11-10 04:22:46 +00:00
parent 497a7a81a8
commit 886645a3c3
1 changed files with 22 additions and 7 deletions
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29
include/llvm/ADT/StringExtras.h
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@ -29,19 +29,34 @@ static inline char hexdigit(unsigned X) {
return X < 10 ? '0' + X : 'A' + X - 10;
}
static inline std::string utohexstr(uint64_t X) {
char Buffer[40];
char *BufPtr = Buffer+39;
*BufPtr = 0; // Null terminate buffer...
if (X == 0) *--BufPtr = '0'; // Handle special case...
/// utohex_buffer - Emit the specified number into the buffer specified by
/// BufferEnd, returning a pointer to the start of the string. This can be used
/// like this: (note that the buffer must be large enough to handle any number):
/// char Buffer[40];
/// printf("0x%s", utohex_buffer(X, Buffer+40));
///
/// This should only be used with unsigned types.
///
template<typename IntTy>
static inline char *utohex_buffer(IntTy X, char *BufferEnd) {
char *BufPtr = BufferEnd;
*--BufPtr = 0; // Null terminate buffer.
if (X == 0) {
*--BufPtr = '0'; // Handle special case.
return BufPtr;
}
while (X) {
unsigned char Mod = static_cast<unsigned char>(X) & 15;
*--BufPtr = hexdigit(Mod);
X >>= 4;
}
return std::string(BufPtr);
return BufPtr;
}
static inline std::string utohexstr(uint64_t X) {
char Buffer[40];
return utohex_buffer(X, Buffer);
}
static inline std::string utostr_32(uint32_t X, bool isNeg = false) {