diff options
Diffstat (limited to 'src/stdlib')
| -rw-r--r-- | src/stdlib/SDL_string.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/stdlib/SDL_string.c b/src/stdlib/SDL_string.c index d70f8666..b6839c1c 100644 --- a/src/stdlib/SDL_string.c +++ b/src/stdlib/SDL_string.c @@ -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) |