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41 lines
822 B
C++
41 lines
822 B
C++
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// dynsjis.cc
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// 6/11/2015 jichi
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// http://en.wikipedia.org/wiki/Shift_JIS
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#include "dyncodec/dynsjis.h"
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const char *dynsjis::nextchar(const char *s)
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{
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if (!s || !s[0])
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return s;
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if (!s[1])
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return s + 1;
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if (!isleadbyte(s[0]))
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return s + 1;
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return s + 2; // unused byte treated as two-byte character
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}
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const char *dynsjis::prevchar(const char *s, const char *begin)
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{
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if (!s || s <= begin)
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return s;
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if (!*s || s == begin + 1)
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return s - 1;
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if (isleadbyte(s[0]))
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return s - 2;
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if (!isleadbyte(s[-1]))
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return s - 1;
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// 0 is single-width
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// -1 is double-width
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if (!isleadbyte(s[-3]))
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return s - 2;
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const char *p = s - 1;
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while (p != begin && isleadbyte(*p))
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p--;
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size_t dist = s - p;
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if (!isleadbyte(*p))
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dist++;
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return s - 2 + (dist % 2);
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}
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// EOF
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