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sprintf documentation should mention numeric conversion #135

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p5pRT opened this issue Jul 1, 1999 · 2 comments
Closed

sprintf documentation should mention numeric conversion #135

p5pRT opened this issue Jul 1, 1999 · 2 comments

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@p5pRT
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@p5pRT p5pRT commented Jul 1, 1999

Migrated from rt.perl.org#940 (status was 'resolved')

Searchable as RT940$

@p5pRT
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@p5pRT p5pRT commented Jul 1, 1999

From garethr@cre.canon.co.uk

This program​:

  $x = 2**32;
  print "\$x is $x\n";
  print sprintf "\$x is %d\n", $x;

prints

  $x is 4294967296
  $x is -1

I think that the section on `sprintf' in the `perlfunc' manpage should
document exactly what numeric conversion takes place. For example, does
%d always print the value modulo 2^32, or does it depend on the
operating system or architecture?

Perl Info


Site configuration information for perl 5.00502:

Configured by abw at Thu Nov 19 10:50:08 GMT 1998.

Summary of my perl5 (5.0 patchlevel 5 subversion 2) configuration:
  Platform:
    osname=solaris, osvers=2.6, archname=sun4-solaris
    uname='sunos bandanna 5.6 generic_105181-03 sun4u sparc sunw,ultra-1 '
    hint=previous, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='gcc', optimize='-O', gccversion=2.8.0
    cppflags='-I/opt/gnu/include -I/user/perl/build/include'
    ccflags ='-I/opt/gnu/include -I/user/perl/build/include'
    stdchar='unsigned char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    alignbytes=8, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags ='-L/opt/gnu/lib -L/user/perl/build/lib'
    libpth=/opt/gnu/lib /lib /usr/lib /usr/ccs/lib /user/perl/build/lib
    libs=-lsocket -lnsl -lgdbm -ldl -lm -lc -lcrypt -ldb
    libc=/lib/libc.so, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-fPIC', lddlflags='-G -L/opt/gnu/lib -L/user/perl/build/lib'

Locally applied patches:
    


@INC for perl 5.00502:
    /apps/perl5/lib/5.00502/sun4-solaris
    /apps/perl5/lib/5.00502
    /apps/perl5/lib/site_perl/5.005/sun4-solaris
    /apps/perl5/lib/site_perl/5.005
    .


Environment for perl 5.00502:
    HOME=/user/garethr
    LANG=C
    LD_LIBRARY_PATH=/usr/dt/lib:/usr/openwin/lib:/apps/X11R5/lib:/usr/lib
    LOGDIR (unset)
    PATH=/usr/dt/bin:/usr/openwin/bin:/bin:/usr/bin:/usr/ucb:/bin:/usr/bin:/cre/bin:/apps/gcc-2.8.0/bin:/apps/frame5/bin:/apps/emacs/bin:/apps/tex/bin:/apps/perl5/bin:/user/web/bin/scripts:/user/web/bin/SunOS-5.6:/apps/gnu/bin:/apps/mysql/bin:/usr/ccs/bin:/apps/X11R5/bin:/usr/openwin/bin
    PERL_BADLANG (unset)
    SHELL=/cre/bin/bash

@p5pRT
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@p5pRT p5pRT commented Sep 5, 1999

From [Unknown Contact. See original ticket]

garethr@​cre.canon.co.uk (Gareth Rees) wrote​:

I think that the section on `sprintf' in the `perlfunc' manpage should
document exactly what numeric conversion takes place. For example, does
%d always print the value modulo 2^32, or does it depend on the
%operating system or architecture?

An appeal to the ANSI spec would probably yield the answer, which is
that it defaults to native 'int' unless you've asked Perl to
'USE_64_BITS'.

To avoid having to appeal to a non-Artistic source of documentation, I
suggest the following addition. Note that I've altered 'flags' to
'characters' as well, since some of the 'flags' mentioned are in fact
conversion characters.

Inline Patch
--- pod/perlfunc.pod.orig	Mon Aug 23 15:16:57 1999
+++ pod/perlfunc.pod	Sun Sep  5 15:57:09 1999
@@ -4102,4 +4102,5 @@
    l       interpret integer as C type "long" or "unsigned long"
    h       interpret integer as C type "short" or "unsigned short"
+           If no flags, interpret integer as C type "int" or "unsigned"
 
 There is also one Perl-specific flag:
@@ -4119,5 +4120,5 @@
 If Perl understands "quads" (64-bit integers) (this requires
 either that the platform natively supports quads or that Perl
-has been specifically compiled to support quads), the flags
+has been specifically compiled to support quads), the characters
 
 	d u o x X b i D U O
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