Re: [RFC PATCH 1/1] json-writer: incorrect format specifier
On 3/26/2018 11:26 PM, Ramsay Jones wrote: On 26/03/18 18:04, Junio C Hamano wrote: Ramsay Joneswrites: [...] I must confess to not having given any thought to the wider implications of the code. I don't really know what this code is going to be used for. [Although I did shudder when I read some mention of a 'universal interchange format' - I still have nightmares about XML :-D ] [...] My current goals are to add telemetry in a friendly way and have events written in JSON to some audit destination. Something like: { "argv":["./git","status"], "pid":84941, "exit-code":0, "elapsed-time":0.011121, "version":"2.16.2.5.g71445db.dirty", ... } Later, we could add a JSON formatter to a command like "status" and then do things like: $ git status --json | python '... json.load ...' and eliminate the need to write custom parsers for normal or porcelain formats. There are other commands that could be similarly adapted and save callers a lot of screen-scraping code. But that is later. Thanks, Jeff
Re: [RFC PATCH 1/1] json-writer: incorrect format specifier
On 26/03/18 18:04, Junio C Hamano wrote: > Ramsay Joneswrites: > @@ -120,7 +120,7 @@ void jw_object_uint64(struct json_writer *jw, const char *key, uint64_t value) maybe_add_comma(jw); append_quoted_string(>json, key); - strbuf_addf(>json, ":%"PRIuMAX, value); + strbuf_addf(>json, ":%"PRIu64, value); >>> >>> In this code-base, that would normally be written as: >>> >>> strbuf_addf(>json, ":%"PRIuMAX, (uintmax_t) value); >> >> heh, I should learn not to reply in a hurry, just before >> going out ... >> >> I had not noticed that 'value' was declared with an 'sized type' >> of uint64_t, so using PRIu64 should be fine. > > But why is this codepath using a sized type in the first place? It > is not like it wants to read/write a fixed binary file format---it > just wants to use an integer type that is wide enough to handle any > inttype the platform uses, for which uintmax_t would be a more > appropriate type, no? I must confess to not having given any thought to the wider implications of the code. I don't really know what this code is going to be used for. [Although I did shudder when I read some mention of a 'universal interchange format' - I still have nightmares about XML :-D ] ATB, Ramsay Jones
Re: [RFC PATCH 1/1] json-writer: incorrect format specifier
On 3/26/2018 1:04 PM, Junio C Hamano wrote: Ramsay Joneswrites: @@ -120,7 +120,7 @@ void jw_object_uint64(struct json_writer *jw, const char *key, uint64_t value) maybe_add_comma(jw); append_quoted_string(>json, key); - strbuf_addf(>json, ":%"PRIuMAX, value); + strbuf_addf(>json, ":%"PRIu64, value); In this code-base, that would normally be written as: strbuf_addf(>json, ":%"PRIuMAX, (uintmax_t) value); heh, I should learn not to reply in a hurry, just before going out ... I had not noticed that 'value' was declared with an 'sized type' of uint64_t, so using PRIu64 should be fine. But why is this codepath using a sized type in the first place? It is not like it wants to read/write a fixed binary file format---it just wants to use an integer type that is wide enough to handle any inttype the platform uses, for which uintmax_t would be a more appropriate type, no? [Somehow the conversation forked and this compiler warning appeared in both the json-writer and the rebase-interactive threads. I'm copying here the response that I already made on the latter.] I defined that routine to take a uint64_t because I wanted to pass a nanosecond value received from getnanotime() and that's what it returns. My preference would be to change the PRIuMAX to PRIu64, but there aren't any other references in the code to that symbol and I didn't want to start a new trend here. I am concerned that the above compiler error message says that uintmax_t is defined as an "unsigned long" (which is defined as *at least* 32 bits, but not necessarily 64. But a uint64_t is defined as a "unsigned long long" and guaranteed as a 64 bit value. So while I'm not really worried about 128 bit integers right now, I'm more concerned about 32 bit compilers truncating that value without any warnings. Jeff
Re: [RFC PATCH 1/1] json-writer: incorrect format specifier
Ramsay Joneswrites: >>> @@ -120,7 +120,7 @@ void jw_object_uint64(struct json_writer *jw, const >>> char *key, uint64_t value) >>> maybe_add_comma(jw); >>> >>> append_quoted_string(>json, key); >>> - strbuf_addf(>json, ":%"PRIuMAX, value); >>> + strbuf_addf(>json, ":%"PRIu64, value); >> >> In this code-base, that would normally be written as: >> >> strbuf_addf(>json, ":%"PRIuMAX, (uintmax_t) value); > > heh, I should learn not to reply in a hurry, just before > going out ... > > I had not noticed that 'value' was declared with an 'sized type' > of uint64_t, so using PRIu64 should be fine. But why is this codepath using a sized type in the first place? It is not like it wants to read/write a fixed binary file format---it just wants to use an integer type that is wide enough to handle any inttype the platform uses, for which uintmax_t would be a more appropriate type, no?
Re: [RFC PATCH 1/1] json-writer: incorrect format specifier
On 24/03/18 15:14, Ramsay Jones wrote: > > > On 24/03/18 05:37, Wink Saville wrote: >> In routines jw_object_uint64 and jw_object_double strbuf_addf is >> invoked with strbuf_addf(>json, ":%"PRIuMAX, value) where value >> is a uint64_t. This causes a compile error on OSX. >> >> The correct format specifier is PRIu64 instead of PRIuMax. >> >> Signed-off-by: Wink Saville>> --- >> json-writer.c | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/json-writer.c b/json-writer.c >> index 89a6abb57..04045448a 100644 >> --- a/json-writer.c >> +++ b/json-writer.c >> @@ -120,7 +120,7 @@ void jw_object_uint64(struct json_writer *jw, const char >> *key, uint64_t value) >> maybe_add_comma(jw); >> >> append_quoted_string(>json, key); >> -strbuf_addf(>json, ":%"PRIuMAX, value); >> +strbuf_addf(>json, ":%"PRIu64, value); > > In this code-base, that would normally be written as: > > strbuf_addf(>json, ":%"PRIuMAX, (uintmax_t) value); heh, I should learn not to reply in a hurry, just before going out ... I had not noticed that 'value' was declared with an 'sized type' of uint64_t, so using PRIu64 should be fine. Well, except that you may have to add a 'fallback' definition of PRIu64 to one of the 'compat/mingw.h', 'compat/msvc.h' or 'git-compat-util.h' header files. (see e.g. PRId64 at compat/mingw.h:429). [About a decade ago, I heard microsoft were implementing C99 'real soon now' ;-) ] ATB, Ramsay Jones
Re: [RFC PATCH 1/1] json-writer: incorrect format specifier
On 24/03/18 05:37, Wink Saville wrote: > In routines jw_object_uint64 and jw_object_double strbuf_addf is > invoked with strbuf_addf(>json, ":%"PRIuMAX, value) where value > is a uint64_t. This causes a compile error on OSX. > > The correct format specifier is PRIu64 instead of PRIuMax. > > Signed-off-by: Wink Saville> --- > json-writer.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/json-writer.c b/json-writer.c > index 89a6abb57..04045448a 100644 > --- a/json-writer.c > +++ b/json-writer.c > @@ -120,7 +120,7 @@ void jw_object_uint64(struct json_writer *jw, const char > *key, uint64_t value) > maybe_add_comma(jw); > > append_quoted_string(>json, key); > - strbuf_addf(>json, ":%"PRIuMAX, value); > + strbuf_addf(>json, ":%"PRIu64, value); In this code-base, that would normally be written as: strbuf_addf(>json, ":%"PRIuMAX, (uintmax_t) value); ATB, Ramsay Jones
Re: [RFC PATCH 1/1] json-writer: incorrect format specifier
On 3/24/2018 1:37 AM, Wink Saville wrote: In routines jw_object_uint64 and jw_object_double strbuf_addf is invoked with strbuf_addf(>json, ":%"PRIuMAX, value) where value is a uint64_t. This causes a compile error on OSX. The correct format specifier is PRIu64 instead of PRIuMax. Signed-off-by: Wink SavilleThat's odd. A grep on the Git source tree did not find a "PRIu64" symbol. Searching public-inbox only found one message [1] talking about it (other than the ones associated with your messages here). I have to wonder if that is defined in a OSX header file and you're getting it from there [2]. (I don't have a MAC in front of me, so I can't verify what's in that header.) But [2] defines PRIuMAX as PRIu64, so we shouldn't need to make that change in json-writer -- unless something is getting lost in the #ifdefs. Could you double check this in the header files on your system? Any chance you are doing a 32-bit build? Thanks Jeff [1] https://public-inbox.org/git/mwhpr21mb0478181ae0b64901da2c07cdf4...@mwhpr21mb0478.namprd21.prod.outlook.com/raw [2] https://opensource.apple.com/source/gcc/gcc-926/inttypes.h.auto.html --- json-writer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/json-writer.c b/json-writer.c index 89a6abb57..04045448a 100644 --- a/json-writer.c +++ b/json-writer.c @@ -120,7 +120,7 @@ void jw_object_uint64(struct json_writer *jw, const char *key, uint64_t value) maybe_add_comma(jw); append_quoted_string(>json, key); - strbuf_addf(>json, ":%"PRIuMAX, value); + strbuf_addf(>json, ":%"PRIu64, value); } void jw_object_double(struct json_writer *jw, const char *fmt, @@ -225,7 +225,7 @@ void jw_array_uint64(struct json_writer *jw, uint64_t value) assert_in_array(jw); maybe_add_comma(jw); - strbuf_addf(>json, "%"PRIuMAX, value); + strbuf_addf(>json, "%"PRIu64, value); } void jw_array_double(struct json_writer *jw, const char *fmt, double value)
[RFC PATCH 1/1] json-writer: incorrect format specifier
In routines jw_object_uint64 and jw_object_double strbuf_addf is invoked with strbuf_addf(>json, ":%"PRIuMAX, value) where value is a uint64_t. This causes a compile error on OSX. The correct format specifier is PRIu64 instead of PRIuMax. Signed-off-by: Wink Saville--- json-writer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/json-writer.c b/json-writer.c index 89a6abb57..04045448a 100644 --- a/json-writer.c +++ b/json-writer.c @@ -120,7 +120,7 @@ void jw_object_uint64(struct json_writer *jw, const char *key, uint64_t value) maybe_add_comma(jw); append_quoted_string(>json, key); - strbuf_addf(>json, ":%"PRIuMAX, value); + strbuf_addf(>json, ":%"PRIu64, value); } void jw_object_double(struct json_writer *jw, const char *fmt, @@ -225,7 +225,7 @@ void jw_array_uint64(struct json_writer *jw, uint64_t value) assert_in_array(jw); maybe_add_comma(jw); - strbuf_addf(>json, "%"PRIuMAX, value); + strbuf_addf(>json, "%"PRIu64, value); } void jw_array_double(struct json_writer *jw, const char *fmt, double value) -- 2.16.2