kendall@wjh12.UUCP (Sam Kendall) (03/25/84)
The new functions in System V.2, vprintf, vfprintf, and vsprintf, provide the functionality of calling _doprnt directly. I would like to know why these three new functions were defined when printf under V7 already had a solution, albeit undocumented: the %r conversion code. %r could have been defined in terms of the varargs macros, and still have been upward compatible from V7. *Sigh*. Sam Kendall {allegra,ihnp4,ima,amd70}!wjh12!kendall Delft Consulting Corp. decvax!genrad!wjh12!kendall
gwyn@brl-vgr.ARPA (Doug Gwyn ) (03/27/84)
I believe (but am not sure) that the %r embedded format spec could\ not be implemented successfully on all computer architectures whereas varargs can. Anyone have more specific information?
kendall@wjh12.UUCP (Sam Kendall) (03/28/84)
<> I believe (but am not sure) that the %r embedded format spec could not be implemented successfully on all computer architectures whereas varargs can. That is true, if we define the operand of %r to be a char **. But if we define it to be a va_list (a type defined in <varargs.h>) we get a portable interface, and upward compatibility from V7 on most architectures. Sam Kendall {allegra,ihnp4,ima,amd70}!wjh12!kendall Delft Consulting Corp. decvax!genrad!wjh12!kendall