streamtools/timeparse.cpp

   1 #include "timeparse.hpp"
   2 #include <string>
   3 #include <sstream>
   4 #include <stdexcept>
   5
   6 #define MAXTIME 0xFFFFFFFFFFFFFFFFULL
   7
   8 uint64_t parse_timespec(const std::string& str)
   9 {
  10         uint64_t scale = 0;
  11         uint64_t value = 0;
  12         for(int i = 0; str[i]; i++) {
  13                 if(isdigit((unsigned char)str[i])) {
  14                         if(scale == 1)
  15                                 goto bad;
  16                         else if(scale > 1)
  17                                 scale /= 10;
  18                         uint64_t num = str[i] - '0';
  19                         if((MAXTIME - num) / 10 < value)
  20                                 goto bad;
  21                         value = 10 * value + num;
  22                 } else if(str[i] == '.') {
  23                         if(scale > 0)
  24                                 goto bad;
  25                         scale = 1000000000L;
  26                 } else
  27                         goto bad;
  28         }
  29
  30         if(scale) {
  31                 if(MAXTIME / scale < value)
  32                         goto bad;
  33                 value *= scale;
  34         }
  35
  36         return value;
  37 bad:
  38         std::stringstream str_err;
  39         str_err <<  "Bad timespec: " << str;
  40         throw std::runtime_error(str_err.str());
  41 }