mirror of https://github.com/nmlgc/ReC98.git
36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
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// ZUN bloat: At 257 bytes of static data, [_ctype] might be a rather heavy
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// dependency for three digit checks. It's also *technically* wrong, as the
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// <ctype.h> functions are affected by the current locale (see section 7.4.2
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// of the C standard), whereas the subsequent conversion is hardcoded as a
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// single subtraction from an ASCII '0'.
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#include <ctype.h>
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// Code generation… PORTERS: Remove.
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#if defined(__TURBOC__) && defined(__MSDOS__)
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#undef _IS_DIG
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static const unsigned char _IS_DIG = 2;
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#endif
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// Reads up to 3 number digits from [p] and writes the resulting 3-digit number
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// to [ret]. If [p] does not point to any digit, [default_value] is written to
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// [ret] instead.
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template <class T> inline void str_consume_up_to_3_digits(
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int*& ret, T& p, const int& default_value
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) {
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unsigned char c0 = *(p++);
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unsigned char c1 = *(p++);
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unsigned char c2 = *(p++);
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if(!isdigit(c0)) {
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*ret = default_value;
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p -= 3;
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} else if(!isdigit(c1)) {
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*ret = (c0 - '0');
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p -= 2;
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} else if(!isdigit(c2)) {
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*ret = (((c0 - '0') * 10) + c1 - '0');
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p -= 1;
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} else {
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*ret = (((c0 - '0') * 100) + ((c1 - '0') * 10) + (c2 - '0'));
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}
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}
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