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* c/8294: Support another archetype in "format" function attribute
@ 2002-10-20 14:16 patdoyle
0 siblings, 0 replies; only message in thread
From: patdoyle @ 2002-10-20 14:16 UTC (permalink / raw)
To: gcc-gnats
>Number: 8294
>Category: c
>Synopsis: Support another archetype in "format" function attribute
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: unassigned
>State: open
>Class: change-request
>Submitter-Id: net
>Arrival-Date: Sun Oct 20 14:16:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: patdoyle@ca.ibm.com
>Release: unknown-1.0
>Organization:
>Environment:
>Description:
A common way to write vararg functions is to have the function take a count of the number of arguments that follow. (Let's call this, say, the "enumerated" format, just so I can refer to it below.) It would be nice if calls to this kind of function were checked by gcc to have the right number of arguments. This could be a variant of the "format" attribute, like the following:
void foo(int arg_count, ...)
__attribute__ ((format (enumerated(arg_count))));
In fact, even better would be if one could specify any linear function; for example, if the number of arguments should be 2*arg_count+1, then perhaps it could be declared like so:
void foo(int arg_count, ...)
__attribute__ ((format (enumerated(arg_count, 2, 1))));
This would enable it to handle cases I have seen that do data base queries, where the number of key-value pairs is passed:
result_t query(char *table_name, int key_count, ...)
__attribute__ ((format(enumerated(key_count, 2, 0))));
I hope this is the right forum for this kind of feature request.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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2002-10-20 14:16 c/8294: Support another archetype in "format" function attribute patdoyle
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