mirror of
https://github.com/HIllya51/LunaHook.git
synced 2024-12-25 20:54:15 +08:00
41 lines
822 B
C++
41 lines
822 B
C++
// dynsjis.cc
|
|
// 6/11/2015 jichi
|
|
// http://en.wikipedia.org/wiki/Shift_JIS
|
|
#include "dyncodec/dynsjis.h"
|
|
|
|
const char *dynsjis::nextchar(const char *s)
|
|
{
|
|
if (!s || !s[0])
|
|
return s;
|
|
if (!s[1])
|
|
return s + 1;
|
|
if (!isleadbyte(s[0]))
|
|
return s + 1;
|
|
return s + 2; // unused byte treated as two-byte character
|
|
}
|
|
|
|
const char *dynsjis::prevchar(const char *s, const char *begin)
|
|
{
|
|
if (!s || s <= begin)
|
|
return s;
|
|
if (!*s || s == begin + 1)
|
|
return s - 1;
|
|
if (isleadbyte(s[0]))
|
|
return s - 2;
|
|
if (!isleadbyte(s[-1]))
|
|
return s - 1;
|
|
// 0 is single-width
|
|
// -1 is double-width
|
|
if (!isleadbyte(s[-3]))
|
|
return s - 2;
|
|
const char *p = s - 1;
|
|
while (p != begin && isleadbyte(*p))
|
|
p--;
|
|
size_t dist = s - p;
|
|
if (!isleadbyte(*p))
|
|
dist++;
|
|
return s - 2 + (dist % 2);
|
|
}
|
|
|
|
// EOF
|