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stdlib: added SDL_utf8strlen().

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This commit is contained in:
Ryan C. Gordon 2017-05-29 03:01:05 -04:00
parent fc510bd798
commit d4086e4a70
4 changed files with 20 additions and 0 deletions
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1
include/SDL_stdinc.h
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@ -416,6 +416,7 @@ extern DECLSPEC char *SDLCALL SDL_strlwr(char *str);
extern DECLSPEC char *SDLCALL SDL_strchr(const char *str, int c);
extern DECLSPEC char *SDLCALL SDL_strrchr(const char *str, int c);
extern DECLSPEC char *SDLCALL SDL_strstr(const char *haystack, const char *needle);
extern DECLSPEC size_t SDLCALL SDL_utf8strlen(const char *str);
extern DECLSPEC char *SDLCALL SDL_itoa(int value, char *str, int radix);
extern DECLSPEC char *SDLCALL SDL_uitoa(unsigned int value, char *str, int radix);

1
src/dynapi/SDL_dynapi_overrides.h
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@ -624,3 +624,4 @@
#define SDL_MemoryBarrierReleaseFunction SDL_MemoryBarrierReleaseFunction_REAL
#define SDL_MemoryBarrierAcquireFunction SDL_MemoryBarrierAcquireFunction_REAL
#define SDL_JoystickGetDeviceInstanceID SDL_JoystickGetDeviceInstanceID_REAL
#define SDL_utf8strlen SDL_utf8strlen_REAL

1
src/dynapi/SDL_dynapi_procs.h
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@ -656,3 +656,4 @@ SDL_DYNAPI_PROC(SDL_JoystickType,SDL_JoystickGetType,(SDL_Joystick *a),(a),retur
SDL_DYNAPI_PROC(void,SDL_MemoryBarrierReleaseFunction,(void),(),)
SDL_DYNAPI_PROC(void,SDL_MemoryBarrierAcquireFunction,(void),(),)
SDL_DYNAPI_PROC(SDL_JoystickID,SDL_JoystickGetDeviceInstanceID,(int a),(a),return)
SDL_DYNAPI_PROC(size_t,SDL_utf8strlen,(const char *a),(a),return)

17
src/stdlib/SDL_string.c
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@ -509,6 +509,23 @@ size_t SDL_utf8strlcpy(SDL_OUT_Z_CAP(dst_bytes) char *dst, const char *src, size
return bytes;
}
size_t
SDL_utf8strlen(const char *str)
{
size_t retval = 0;
const char *p = str;
char ch;
while ((ch = *(p++))) {
/* if top two bits are 1 and 0, it's a continuation byte. */
if ((ch & 0xc0) != 0x80) {
retval++;
}
}
return retval;
}
size_t
SDL_strlcat(SDL_INOUT_Z_CAP(maxlen) char *dst, const char *src, size_t maxlen)
{