netdev - Re: [PATCH iproute2-next] json_print: fix print

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Date:   Thu, 29 Mar 2018 14:03:50 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Kevin Darbyshire-Bryant <ldir@...byshire-bryant.me.uk>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next] json_print: fix print_uint with helper
 type extensions

On Thu, 29 Mar 2018 20:32:10 +0100
Kevin Darbyshire-Bryant <ldir@...byshire-bryant.me.uk> wrote:

> Introduce print helper functions for int, uint, explicit int32, uint32,
> int64 & uint64.
> 
> print_int used 'int' type internally, whereas print_uint used 'uint64_t'
> 
> These helper functions eventually call vfprintf(fp, fmt, args) which is
> a variable argument list function and is dependent upon 'fmt' containing
> correct information about the length of the passed arguments.
> 
> Unfortunately print_int v print_uint offered no clue to the programmer
> that internally passed ints to print_uint were being promoted to 64bits,
> thus the format passed in 'fmt' string vs the actual passed integer
> could be different lengths.  This is even more interesting on big endian
> architectures where 'vfprintf' would be looking in the middle of an
> int64 type.
> 
> print_u/int now stick with native int size.  print_u/int32 & print
> u/int64 functions offer explicit integer sizes.
> 
> To portably use these formats you should use the relevant PRIdN or PRIuN
> formats as defined in inttypes.h
> 
> e.g.
> 
> print_uint64(PRINT_ANY, "refcnt", "refcnt %" PRIu64 " ", t->tcm_info)
> 
> Signed-off-by: Kevin Darbyshire-Bryant <ldir@...byshire-bryant.me.uk>
> ---
>  include/json_print.h | 6 +++++-
>  lib/json_print.c     | 6 +++++-
>  2 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/include/json_print.h b/include/json_print.h
> index 2ca7830a..fb62b142 100644
> --- a/include/json_print.h
> +++ b/include/json_print.h
> @@ -56,10 +56,14 @@ void close_json_array(enum output_type type, const char *delim);
>  		print_color_##type_name(t, COLOR_NONE, key, fmt, value);	\
>  	}
>  _PRINT_FUNC(int, int);
> +_PRINT_FUNC(uint, unsigned int);
>  _PRINT_FUNC(bool, bool);
>  _PRINT_FUNC(null, const char*);
>  _PRINT_FUNC(string, const char*);
> -_PRINT_FUNC(uint, uint64_t);
> +_PRINT_FUNC(int32, int32_t);
> +_PRINT_FUNC(uint32, uint32_t);
> +_PRINT_FUNC(int64, int64_t);
> +_PRINT_FUNC(uint64, uint64_t);
>  _PRINT_FUNC(hu, unsigned short);
>  _PRINT_FUNC(hex, unsigned int);
>  _PRINT_FUNC(0xhex, unsigned int);
> diff --git a/lib/json_print.c b/lib/json_print.c
> index bda72933..1194a6ec 100644
> --- a/lib/json_print.c
> +++ b/lib/json_print.c
> @@ -116,8 +116,12 @@ void close_json_array(enum output_type type, const char *str)
>  		}							\
>  	}
>  _PRINT_FUNC(int, int);
> +_PRINT_FUNC(uint, unsigned int);
>  _PRINT_FUNC(hu, unsigned short);
> -_PRINT_FUNC(uint, uint64_t);
> +_PRINT_FUNC(int32, int32_t);
> +_PRINT_FUNC(uint32, uint32_t);
> +_PRINT_FUNC(int64, int64_t);
> +_PRINT_FUNC(uint64, uint64_t);
>  _PRINT_FUNC(lluint, unsigned long long int);
>  _PRINT_FUNC(float, double);
>  #undef _PRINT_FUNC

You sent patches to both trees. That is not the correct protocol.
Choose one, get it reviewed.  iproute2-next will get merged from master (in fact
dave should be doing it regularly).