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VISO: Small micro-optimization and cleanup

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This commit is contained in:
RichardG867
2022-10-15 14:45:49 -03:00
parent 10e9285f61
commit f0ee61041c
1 changed files with 21 additions and 21 deletions
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42
src/cdrom/cdrom_image_viso.c
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@@ -175,7 +175,7 @@ viso_convert_utf8(wchar_t *dest, const char *src, ssize_t buf_size)
*p = 0; *p = 0;
break; break;
} else if (c & 0x80) { } else if (c & 0x80) {
/* Convert UTF-8 codepoints. */ /* Convert UTF-8 sequence into a codepoint. */
next = 0; next = 0;
while (c & 0x40) { while (c & 0x40) {
next++; next++;
@@ -184,26 +184,26 @@ viso_convert_utf8(wchar_t *dest, const char *src, ssize_t buf_size)
c = *src++ & (0x3f >> next); c = *src++ & (0x3f >> next);
while ((next-- > 0) && ((*src & 0xc0) == 0x80)) while ((next-- > 0) && ((*src & 0xc0) == 0x80))
c = (c << 6) | (*src++ & 0x3f); c = (c << 6) | (*src++ & 0x3f);
/* Convert codepoints >= U+10000 to UTF-16 surrogate pairs.
This has to be done here because wchar_t on some platforms
(Windows) is not wide enough to store such high codepoints. */
if (c >= 0x10000) {
if ((c <= 0x10ffff) && (buf_size-- > 0)) {
/* Encode surrogate pair. */
c -= 0x10000;
*p++ = 0xd800 | (c >> 10);
c = 0xdc00 | (c & 0x3ff);
} else {
/* Codepoint overflow or no room for a pair. */
c = '?';
}
}
} else { } else {
/* Pass through sub-UTF-8 codepoints. */ /* Pass through sub-UTF-8 codepoints. */
src++; src++;
} }
/* Convert codepoints >= U+10000 to UTF-16 surrogate pairs.
This has to be done here because wchar_t on some platforms
(Windows) is not wide enough to store such high codepoints. */
if (c >= 0x10000) {
if ((c <= 0x10ffff) && (buf_size-- > 0)) {
/* Encode surrogate pair. */
c -= 0x10000;
*p++ = 0xd800 | (c >> 10);
c = 0xdc00 | (c & 0x3ff);
} else {
/* Codepoint overflow or no room for a pair. */
c = '?';
}
}
/* Write destination codepoint. */ /* Write destination codepoint. */
*p++ = c; *p++ = c;
} }
@@ -211,11 +211,11 @@ viso_convert_utf8(wchar_t *dest, const char *src, ssize_t buf_size)
return p - dest; return p - dest;
} }
#define VISO_WRITE_STR_FUNC(n, dt, st, cnv) \ #define VISO_WRITE_STR_FUNC(func, dst_type, src_type, converter) \
static void \ static void \
n(dt *dest, const st *src, ssize_t buf_size, int charset) \ func(dst_type *dest, const src_type *src, ssize_t buf_size, int charset) \
{ \ { \
st c; \ src_type c; \
while (buf_size-- > 0) { \ while (buf_size-- > 0) { \
/* Interpret source codepoint. */ \ /* Interpret source codepoint. */ \
c = *src++; \ c = *src++; \
@@ -223,7 +223,7 @@ viso_convert_utf8(wchar_t *dest, const char *src, ssize_t buf_size)
case 0x00: \ case 0x00: \
/* Terminator, apply space padding. */ \ /* Terminator, apply space padding. */ \
while (buf_size-- >= 0) \ while (buf_size-- >= 0) \
*dest++ = cnv(' '); \ *dest++ = converter(' '); \
return; \ return; \
\ \
case 'A' ... 'Z': \ case 'A' ... 'Z': \
@@ -283,7 +283,7 @@ viso_convert_utf8(wchar_t *dest, const char *src, ssize_t buf_size)
} \ } \
\ \
/* Write destination codepoint with conversion function applied. */ \ /* Write destination codepoint with conversion function applied. */ \
*dest++ = cnv(c); \ *dest++ = converter(c); \
} \ } \
} }
VISO_WRITE_STR_FUNC(viso_write_string, uint8_t, char, ) VISO_WRITE_STR_FUNC(viso_write_string, uint8_t, char, )