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authordkf <donal.k.fellows@manchester.ac.uk>2012-12-23 08:17:17 (GMT)
committerdkf <donal.k.fellows@manchester.ac.uk>2012-12-23 08:17:17 (GMT)
commit42c352d6258bc3ec26c19183c29b5a4ac4301a81 (patch)
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Change back to using an isDigit function. We simply don't need to make any
(formally non-portable) assumptions about what happens when an unsigned zero is decremented, and the code isn't in a performance-critical area. Remark by jan.nijtmans: The macro is perfectly portable! Not portable is the exact result of the substraction ('\xB0' - '0' might give 0x80 on some platforms and 0xffffff80 on others), but comparing <= 9 always gives the correct result. We are only checking for digits here! The macro correctly inlines with any compiler, so it's better anyway. Remark by dkf: But it's less clear. In this code, that's more important than a teeny bit of speed from inlining in a non-critical location.
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