Are there macros that provide the correct printf format specifiers for IV, UV, STRLEN, Size_t and SSize_t? None are listed in perlapi.
C provides macros for the format specifiers for the types provided by stdint.h, such as uint32_t.
#include <inttypes.h>
#include <stdint.h>
uint32_t i = ...;
printf("i = %" PRIu32 "\n", i);
Is there something similar to PRIu32 for IV, UV, STRLEN, Size_t and SSize_t?
The larger problem is that I'm trying to suggest a fix for the following compilation warnings produced when installing Sort::Key on Ubuntu on Windows Subsystem for Linux:
Key.xs: In function ‘_keysort’:
Key.xs:237:12: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘IV {aka long int}’ [-Wformat=]
croak("unsupported sort type %d", type);
^~~~~~~~~~~~~~~~~~~~~~~~~~
Key.xs: In function ‘_multikeysort’:
Key.xs:547:9: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘STRLEN {aka long unsigned int}’ [-Wformat=]
croak("wrong number of results returned "
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Key.xs:547:9: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘IV {aka long int}’ [-Wformat=]
For UV, the following macros exist:
UVuf (decimal)UVof (octal)UVxf (lc hex)UVXf (uc hex)For IV, the following macro exists:
IVdf (decimal)For NV, the following macros exist:
NVef ("%e-ish")NVff ("%f-ish")NVgf ("%g-ish")For Size_t and STRLEN, use the builtin z length modifier.[1]
%zu (decimal)%zo (octal)%zx (lc hex)%zX (uc hex)For SSize_t, use the builtin z length modifier.[1]
%zd (decimal)For example,
IV iv = ...;
STRLEN len = ...;
croak("iv=%" IVdf " len=%zu", iv, len);
Size_t and SSize_t are configurable, they're never different from size_t and ssize_t in practice, and STRLEN is a typedef for Size_t.