EPICS [Bug 1740426] Re: portable printf() spec for size

Experimental Physics and Industrial Control System

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Subject:	[Bug 1740426] Re: portable printf() spec for size_t, long long, and others
From:	mdavidsaver via Core-talk <core-talk at aps.anl.gov>
To:	core-talk at aps.anl.gov
Date:	Wed, 03 Aug 2022 13:58:43 -0000

** Description changed:

  I've been in the habit of using '%lld' and '%zu' to print 'long long'
- and 'size_t' respectively.  However, the windows world needs '%I64d' and
- '%Iu' instead.  It would be nice to have compatibility macros for this.
+ and 'size_t' respectively.
  
  stdint.h/inttypes.h has a convention for this for the standard fixed
  width types.  eg. PRIx32 for 'uint32_t'.  This is used like:
  
  > printf("%"PRIx32"\n", (uint32_t)42);
  
  http://en.cppreference.com/w/c/types/integer
+ 
+ edit 2022: As Mark points out, Windows supports %zu.  The remaining
+ holdout is vxWorks...

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https://bugs.launchpad.net/bugs/1740426

Title:
  portable printf() spec for size_t, long long, and others

Status in EPICS Base:
  Triaged

Bug description:
  I've been in the habit of using '%lld' and '%zu' to print 'long long'
  and 'size_t' respectively.

  stdint.h/inttypes.h has a convention for this for the standard fixed
  width types.  eg. PRIx32 for 'uint32_t'.  This is used like:

  > printf("%"PRIx32"\n", (uint32_t)42);

  http://en.cppreference.com/w/c/types/integer

  edit 2022: As Mark points out, Windows supports %zu.  The remaining
  holdout is vxWorks...

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