- unsigned long long v = 0;
-
- switch (base) {
- case 16:
- for (;; ++s) {
- /* check for overrun */
- if (v >= 0x1000000000000000ULL)
- break;
- switch (tolower(*s)) {
- case '0': v <<= 4; break;
- case '1': v <<= 4; v |= 0x1; break;
- case '2': v <<= 4; v |= 0x2; break;
- case '3': v <<= 4; v |= 0x3; break;
- case '4': v <<= 4; v |= 0x4; break;
- case '5': v <<= 4; v |= 0x5; break;
- case '6': v <<= 4; v |= 0x6; break;
- case '7': v <<= 4; v |= 0x7; break;
- case '8': v <<= 4; v |= 0x8; break;
- case '9': v <<= 4; v |= 0x9; break;
- case 'a': v <<= 4; v |= 0xa; break;
- case 'b': v <<= 4; v |= 0xb; break;
- case 'c': v <<= 4; v |= 0xc; break;
- case 'd': v <<= 4; v |= 0xd; break;
- case 'e': v <<= 4; v |= 0xe; break;
- case 'f': v <<= 4; v |= 0xf; break;
- default:
- goto end;
- }
- }
- break;
- case 8:
- for (;; ++s) {
- /* check for overrun */
- if (v >= 0x2000000000000000ULL)
- break;
- switch (tolower(*s)) {
- case '0': v <<= 3; break;
- case '1': v <<= 3; v |= 1; break;
- case '2': v <<= 3; v |= 2; break;
- case '3': v <<= 3; v |= 3; break;
- case '4': v <<= 3; v |= 4; break;
- case '5': v <<= 3; v |= 5; break;
- case '6': v <<= 3; v |= 6; break;
- case '7': v <<= 3; v |= 7; break;
- default:
- goto end;
- }
- }
- break;
- case 10:
- for (;; ++s) {
- /* check for overrun */
- if (v > 0x1999999999999999ULL)
- break;
- switch (tolower(*s)) {
- case '0': v *= 10; break;
- case '1': v *= 10; v += 1; break;
- case '2': v *= 10; v += 2; break;
- case '3': v *= 10; v += 3; break;
- case '4': v *= 10; v += 4; break;
- case '5': v *= 10; v += 5; break;
- case '6': v *= 10; v += 6; break;
- case '7': v *= 10; v += 7; break;
- case '8': v *= 10; v += 8; break;
- case '9': v *= 10; v += 9; break;
- default:
- goto end;
- }
- }
- break;
- default:
- assert(0);
- break;