// get_properties.inl
// Note: str_type, llil_int_type and map_str_int_type are not defined here.
// llil_int_type is normally defined as: typedef int_fast64_t llil_int_type;
// Note: int_fast64_t is defined in <cstdint>
// map_str_int_type is keyed by str_type with value of llil_int_type.
// These three types must be defined by the code that includes this .inl file.
// map_str_int_type can be many different types, std::map, std::unordered_map, ...
// so long as all operations on map_upd below are supported.

#include <cstdint>
#include <cstdio>
#include <array>
#include <algorithm>

inline llil_int_type fast_atoll64( const char* str )
{
   llil_int_type val  = 0;
   // int     sign = 0;
   // if ( *str == '-' ) {
   //    sign = 1, ++str;
   // }
   uint8_t digit;
   while ((digit = uint8_t(*str++ - '0')) <= 9) val = val * 10 + digit;
   // return sign ? -val : val;
   return val;
}

// Limit line length and use ANSI C functions to try to boost performance
#define MAX_LINE_LEN_L 255

// Update map_upd with the properties found in file fname
// Return the number of properties in file fname (or -1 if fname could not be opened)
static llil_int_type get_properties(
   const char*        fname,     // in   : the input file name
   map_str_int_type&  map_upd    // inout: the map to be updated
)
{
   std::array<char, MAX_LINE_LEN_L + 1> line;
   char* found;
   llil_int_type count;
   llil_int_type nprop = 0;
   FILE* fh = ::fopen(fname, "r");
   if ( fh == NULL ) return -1;
   while ( ::fgets( line.data(), static_cast<int>(MAX_LINE_LEN_L), fh ) != NULL ) {
      ++nprop;
      found = std::find( line.begin(), line.end(), '\t' );
      count = fast_atoll64( found + 1 );
      // Note: using emplace() is faster than map_upd[fixword] += count;
#ifdef MAX_STR_LEN_L
      str_type fixword {};  // {} initializes all elements of fixword to '\0'
      std::copy( line.begin(), found, fixword.begin() );
      const auto [it, success] = map_upd.emplace( fixword, count );
#else
      *found = '\0';
      const auto [it, success] = map_upd.emplace(str_type{ line.data() }, count);
#endif
      if (!success) it->second += count;
   }
   ::fclose(fh);
   return nprop;
}