###### (This is the documentation for SDL3, which is under heavy development and the API is changing! [SDL2](https://wiki.libsdl.org/SDL2/) is the current stable version!)
# SDL_strcasecmp

Compare two null-terminated UTF-8 strings, case-insensitively.

## Header File

Defined in [<SDL3/SDL_stdinc.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h)

## Syntax

```c
int SDL_strcasecmp(const char *str1, const char *str2);

```

## Function Parameters

|              |                                                      |
| ------------ | ---------------------------------------------------- |
| **str1**     | The first string to compare. NULL is not permitted!  |
| **str2**     | The second string to compare. NULL is not permitted! |

## Return Value

Returns less than zero if str1 is "less than" str2, greater than zero if
str1 is "greater than" str2, and zero if the strings match exactly.

## Remarks

This will work with Unicode strings, using a technique called
"case-folding" to handle the vast majority of case-sensitive human
languages regardless of system locale. It can deal with expanding values: a
German Eszett character can compare against two ASCII 's' chars and be
considered a match, for example. A notable exception: it does not handle
the Turkish 'i' character; human language is complicated!

Since this handles Unicode, it expects the string to be well-formed UTF-8
and not a null-terminated string of arbitrary bytes. Bytes that are not
valid UTF-8 are treated as Unicode character U+FFFD (REPLACEMENT
CHARACTER), which is to say two strings of random bits may turn out to
match if they convert to the same amount of replacement characters.

## Thread Safety

It is safe to call this function from any thread.

## Version

This function is available since SDL 3.0.0.

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[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction)