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Only append terminating '\0' when necessary.

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Victor Zverovich 2014-02-15 09:24:31 -08:00
parent 430c45d618
commit f43de4a469
1 changed files with 7 additions and 5 deletions
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12
format.h
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@ -1287,13 +1287,12 @@ class FormatInt {
// Buffer should be large enough to hold all digits (digits10 + 1), // Buffer should be large enough to hold all digits (digits10 + 1),
// a sign and a null character. // a sign and a null character.
enum {BUFFER_SIZE = std::numeric_limits<unsigned long long>::digits10 + 3}; enum {BUFFER_SIZE = std::numeric_limits<unsigned long long>::digits10 + 3};
char buffer_[BUFFER_SIZE]; mutable char buffer_[BUFFER_SIZE];
char *str_; char *str_;
// Formats value in reverse and returns the number of digits. // Formats value in reverse and returns the number of digits.
char *FormatDecimal(unsigned long long value) { char *FormatDecimal(unsigned long long value) {
char *buffer_end = buffer_ + BUFFER_SIZE; char *buffer_end = buffer_ + BUFFER_SIZE - 1;
*--buffer_end = '\0';
while (value >= 100) { while (value >= 100) {
// Integer division is slow so do it for a group of two digits instead // Integer division is slow so do it for a group of two digits instead
// of for every digit. The idea comes from the talk by Alexandrescu // of for every digit. The idea comes from the talk by Alexandrescu
@ -1331,8 +1330,11 @@ class FormatInt {
explicit FormatInt(unsigned long value) : str_(FormatDecimal(value)) {} explicit FormatInt(unsigned long value) : str_(FormatDecimal(value)) {}
explicit FormatInt(unsigned long long value) : str_(FormatDecimal(value)) {} explicit FormatInt(unsigned long long value) : str_(FormatDecimal(value)) {}
const char *c_str() const { return str_; } const char *c_str() const {
std::string str() const { return str_; } buffer_[BUFFER_SIZE - 1] = '\0';
return str_;
}
std::string str() const { return std::string(str_, size()); }
std::size_t size() const { return buffer_ - str_ + BUFFER_SIZE - 1; } std::size_t size() const { return buffer_ - str_ + BUFFER_SIZE - 1; }
}; };