raylib libc dependency

raylib is a C library and inevitably it depends on some implementation of C standard library (libc).

While working on raylib 3.0 I took some time to analyze that dependency in detail, no plans to remove it (maybe minimize it a bit) but I think it could be useful to have the knowledge where it is required.

stdlib.h

module	libc function	raylib function
rcore	exit()	TraceLog()

stdio.h

module	libc function	raylib function
rcore	sprintf()	TraceLog()
rcore	fprintf()	SaveFileText()
rcore	fopen() fseek() fread() fwrite() fclose()	LoadFileData() SaveFileData() LoadFileText() SaveFileText()

string.h

module	libc function	raylib function
rcore	strlen()	GetFileNameWithoutExt() GetDirectoryPath() GetPrevDirectoryPath() OpenURL() InitEvdevInput()
rcore	strrchr()	GetExtension() EventThreadSpawn()
rcore	strcmp()	IsGamepadName()
rtext	strcmp()	TextIsEqual()
rtext	strcpy()	TextAppend() TextReplace()
rtext	strncpy()	TextToUtf8() TextReplace()
rtext	strcat()	TextJoin()
rtext	strstr()	several funcs.
rtextures	strlen()	ImageTextEx()
raudio	strcmp()	IsFileExtension()

math.h

module	libc function	raylib function
rmodels rshapes rcamera	sinf() asinf() cosf() acosf() sqrtf() atan2f()	several funcs.
raymath	sinf() cosf() acosf() tan() fabs() sqrtf() fminf() fmaxf()	several funcs.
rcore	tan() atan2()	BeginMode3D(), InitVrSimulator()
rtext	sqrtf()	GenImageFontAtlas()

stdarg.h

module	libc function	raylib function
rcore	va_list, va_start(), vsprintf(), va_end()	TraceLog()
rtext	va_list, va_start(), vsprintf(), va_end()	TextFormat()

Considering the size of raylib, there is not much dependency on libc... that's an interesting consideration for embedded devices development where custom libc implementations could be used.