[Bug stdio/21986] New: __guess_grouping is called incorrectly

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21986

            Bug ID: 21986
           Summary: __guess_grouping is called incorrectly
           Product: glibc
           Version: 2.27
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

stdlib/strfmon_l.c has

     /* If we have to print the digits grouped determine how many
         extra characters this means.  */
      if (group && left_prec != -1) 
        left_prec += __guess_grouping (left_prec,
                                       _NL_CURRENT (LC_MONETARY, MON_GROUPING),
                                       *_NL_CURRENT (LC_MONETARY,
                                                     MON_THOUSANDS_SEP));

But __guess_grouping is defined in stdio-common/printf_fp.c as

unsigned int
__guess_grouping (unsigned int intdig_max, const char *grouping)
{

So the 3rd argument passed to __guess_grouping is ignored.

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