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

     1  #include <ctype.h>
     2  
     3  int iscntrl(int c)
     4  {
     5  	return (unsigned)c < 0x20 || c == 0x7f;
     6  }
     7  
     8  int __iscntrl_l(int c, locale_t l)
     9  {
    10  	return iscntrl(c);
    11  }
    12  
    13  weak_alias(__iscntrl_l, iscntrl_l);