| 14 | #include "steamid.h" |
| 15 | |
| 16 | static const char *DecimalToUint64( const char *pchStr, uint64 unLimit, |
| 17 | uint64 *punVal ) |
| 18 | { |
| 19 | const char *pchStart = pchStr; |
| 20 | uint64 unVal = 0; |
| 21 | |
| 22 | while ( *pchStr >= '0' && *pchStr <= '9' ) |
| 23 | { |
| 24 | uint64 unNext = unVal * 10; |
| 25 | |
| 26 | if ( unNext < unVal ) |
| 27 | { |
| 28 | // 64-bit overflow. |
| 29 | return NULL; |
| 30 | } |
| 31 | |
| 32 | unVal = unNext + (uint64)( *pchStr - '0' ); |
| 33 | if ( unVal > unLimit ) |
| 34 | { |
| 35 | // Limit overflow. |
| 36 | return NULL; |
| 37 | } |
| 38 | |
| 39 | pchStr++; |
| 40 | } |
| 41 | if ( pchStr == pchStart ) |
| 42 | { |
| 43 | // No number at all. |
| 44 | return NULL; |
| 45 | } |
| 46 | |
| 47 | *punVal = unVal; |
| 48 | return pchStr; |
| 49 | } |
| 50 | |
| 51 | //----------------------------------------------------------------------------- |
| 52 | // Purpose: Constructor |