import chris torek's vfprintf() from libc [renamed to kprintf and all

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floating point stuff removed].

the new kprintf replaces the 3 different (and buggy) versions of
printf that were in the kernel before (kprintf, sprintf, and db_printf),
thus reducing duplicated code by 2/3's.   this fixes (or adds) several
printf formats.  examples:
 %#x   - previously only supported by db_printf [not printf/sprintf]
 %8.8s - printf would print "000chuck" for "chuck" before
 %5p   - printf would print "0x    1" for value 1 before

XXX: new kprintf still supports several non-standard '%' formats that
are supposed to eventually be removed:
  %: - passes an additional format string and argument list recursively
  %b - used to decode error registers
  %r - int, but print in radix "db_radix" [DDB only]
  %z - 'signed hex' [DDB only]
  %n - unsigned int, but print in radix "db_radix" [DDB only]

note that DDB's "%n" conflicts with standard "%n" which takes the
number of characters written so far and stores it into the integer
indicated by the "int *" pointer arg.  yuck!

while here, add comments for each function explaining what it is
supposed to do.

...

This commit is contained in:

chuck 1997-10-24 18:14:25 +00:00

parent 23a59f497a

commit 94fa91f862

1 changed files with 868 additions and 494 deletions

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sys/kern/subr_prf.c

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