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Added SDL_utf8strlcpy to copy at UTF-8 character boundaries.

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Changed SDL_SendKeyboardText and SDL_SendEditingText to use SDL_utf8strlcpy.
This commit is contained in:
dewyatt 2010-07-13 15:05:45 -04:00
parent 7e8c791089
commit 34d5cdc704
3 changed files with 52 additions and 2 deletions
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47
src/stdlib/SDL_string.c
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@ -29,6 +29,21 @@
#define SDL_isupperhex(X) (((X) >= 'A') && ((X) <= 'F'))
#define SDL_islowerhex(X) (((X) >= 'a') && ((X) <= 'f'))
#define UTF8_IsLeadByte(c) ((c) >= 0xC0 && (c) <= 0xF4)
#define UTF8_IsTrailingByte(c) ((c) >= 0x80 && (c) <= 0xBF)
int UTF8_TrailingBytes(unsigned char c)
{
if (c >= 0xC0 && c<= 0xDF)
return 1;
else if (c >= 0xE0 && c <= 0xEF)
return 2;
else if (c >= 0xF0 && c <= 0xF4)
return 3;
else
return 0;
}
#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOL)
static size_t
SDL_ScanLong(const char *text, int radix, long *valuep)
@ -362,6 +377,38 @@ SDL_strlcpy(char *dst, const char *src, size_t maxlen)
}
#endif
size_t SDL_utf8strlcpy(char *dst, const char *src, size_t dst_bytes)
{
size_t src_bytes = SDL_strlen(src);
size_t bytes = SDL_min(src_bytes, dst_bytes - 1);
int i = 0;
char trailing_bytes = 0;
if (bytes)
{
unsigned char c = (unsigned char)src[bytes - 1];
if (UTF8_IsLeadByte(c))
--bytes;
else if (UTF8_IsTrailingByte(c))
{
for (i = bytes - 1; i != 0; --i)
{
c = (unsigned char)src[i];
trailing_bytes = UTF8_TrailingBytes(c);
if (trailing_bytes)
{
if (bytes - i != trailing_bytes + 1)
bytes = i;
break;
}
}
}
SDL_memcpy(dst, src, bytes);
}
dst[bytes] = '\0';
return bytes;
}
#ifndef HAVE_STRLCAT
size_t
SDL_strlcat(char *dst, const char *src, size_t maxlen)