setctypes
setctypes(" \t\n|&;<>()", C_LEX1); /* \0 added automatically */
setctypes("*@#!$-?", C_VAR1);
setctypes(" \t\n", C_IFSWS);
setctypes("=-+?", C_SUBOP1);
setctypes("#%", C_SUBOP2);
setctypes(" \n\t\"#$&'()*;<>?[\\`|", C_QUOTE);
void setctypes(const char *, int);
setctypes(" \t\n", C_IFS);
setctypes(s = str_val(vp), C_IFS);