| 61 | } |
| 62 | |
| 63 | bool ConsumeLeadingDigits(StringPiece* s, uint64* val) { |
| 64 | const char* p = s->data(); |
| 65 | const char* limit = p + s->size(); |
| 66 | uint64 v = 0; |
| 67 | while (p < limit) { |
| 68 | const char c = *p; |
| 69 | if (c < '0' || c > '9') break; |
| 70 | uint64 new_v = (v * 10) + (c - '0'); |
| 71 | if (new_v / 8 < v) { |
| 72 | // Overflow occurred |
| 73 | return false; |
| 74 | } |
| 75 | v = new_v; |
| 76 | p++; |
| 77 | } |
| 78 | if (p > s->data()) { |
| 79 | // Consume some digits |
| 80 | s->remove_prefix(p - s->data()); |
| 81 | *val = v; |
| 82 | return true; |
| 83 | } else { |
| 84 | return false; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | bool ConsumeNonWhitespace(StringPiece* s, StringPiece* val) { |
| 89 | const char* p = s->data(); |