stdlib: Add `SDL_utf8strnlen`
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diff --git a/include/SDL_stdinc.h b/include/SDL_stdinc.h
index 6ee15f1..c21e54c 100644
--- a/include/SDL_stdinc.h
+++ b/include/SDL_stdinc.h
@@ -561,6 +561,7 @@ 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 char *SDLCALL SDL_strtokr(char *s1, const char *s2, char **saveptr);
extern DECLSPEC size_t SDLCALL SDL_utf8strlen(const char *str);
+extern DECLSPEC size_t SDLCALL SDL_utf8strnlen(const char *str, size_t bytes);
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);
diff --git a/src/dynapi/SDL_dynapi_overrides.h b/src/dynapi/SDL_dynapi_overrides.h
index 76c9e91..1083fd9 100644
--- a/src/dynapi/SDL_dynapi_overrides.h
+++ b/src/dynapi/SDL_dynapi_overrides.h
@@ -874,3 +874,4 @@
#define SDL_HasLSX SDL_HasLSX_REAL
#define SDL_HasLASX SDL_HasLASX_REAL
#define SDL_RenderGetD3D12Device SDL_RenderGetD3D12Device_REAL
+#define SDL_utf8strnlen SDL_utf8strnlen_REAL
diff --git a/src/dynapi/SDL_dynapi_procs.h b/src/dynapi/SDL_dynapi_procs.h
index ddc6557..db4fa1b 100644
--- a/src/dynapi/SDL_dynapi_procs.h
+++ b/src/dynapi/SDL_dynapi_procs.h
@@ -951,3 +951,4 @@ SDL_DYNAPI_PROC(SDL_bool,SDL_HasLASX,(void),(),return)
#ifdef __WIN32__
SDL_DYNAPI_PROC(ID3D12Device*,SDL_RenderGetD3D12Device,(SDL_Renderer *a),(a),return)
#endif
+SDL_DYNAPI_PROC(size_t,SDL_utf8strnlen,(const char *a, size_t b),(a,b),return)
diff --git a/src/stdlib/SDL_string.c b/src/stdlib/SDL_string.c
index 3125e83..77e0d30 100644
--- a/src/stdlib/SDL_string.c
+++ b/src/stdlib/SDL_string.c
@@ -676,6 +676,23 @@ SDL_utf8strlen(const char *str)
}
size_t
+SDL_utf8strnlen(const char *str, size_t bytes)
+{
+ size_t retval = 0;
+ const char *p = str;
+ unsigned char ch;
+
+ while ((ch = *(p++)) != 0 && bytes-- > 0) {
+ /* 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)
{
#if defined(HAVE_STRLCAT)