(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_StepBackUTF8

Decode a UTF-8 string in reverse, one Unicode codepoint at a time.

Header File

Defined in <SDL3/SDL_stdinc.h>

Syntax

Uint32 SDL_StepBackUTF8(const char *start, const char **pstr);

Function Parameters

const char *	start	a pointer to the beginning of the UTF-8 string.
const char **	pstr	a pointer to a UTF-8 string pointer to be read and adjusted.

Return Value

(Uint32) Returns the previous Unicode codepoint in the string.

Remarks

This will go to the start of the previous Unicode codepoint in the string, move *pstr to that location and return that codepoint.

If *pstr is already at the start of the string), it will not advance *pstr at all.

Generally this function is called in a loop until it returns zero, adjusting its parameter each iteration.

If an invalid UTF-8 sequence is encountered, this function returns SDL_INVALID_UNICODE_CODEPOINT.

Several things can generate invalid UTF-8 sequences, including overlong encodings, the use of UTF-16 surrogate values, and truncated data. Please refer to RFC3629 for details.

Thread Safety

It is safe to call this function from any thread.

Version

This function is available since SDL 3.1.3.

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CategoryAPI, CategoryAPIFunction, CategoryStdinc

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