github.com/afumu/libc@v0.0.6/musl/src/ctype/toupper.c (about)

     1  #include <ctype.h>
     2  
     3  int toupper(int c)
     4  {
     5  	if (islower(c)) return c & 0x5f;
     6  	return c;
     7  }
     8  
     9  int __toupper_l(int c, locale_t l)
    10  {
    11  	return toupper(c);
    12  }
    13  
    14  weak_alias(__toupper_l, toupper_l);