Defines starting with `i' in bsd/include

• _I bsd/include/ctype.h:81
• _IEEE_ bsd/include/math.h:78
• _INVALID_RUNE bsd/include/rune.h:68
• _IOFBF bsd/include/stdio.h:200
• _IOLBF bsd/include/stdio.h:201
• _IONBF bsd/include/stdio.h:202