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From: Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
To: djgpp-workers AT delorie DOT com
Subject: _doprnt() bug fix
Date: Fri, 14 Mar 2008 23:23:25 +0100
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Reply-To: djgpp-workers AT delorie DOT com

The configure script of m4-1.4.10 tests certain printf behaviour issueing a
code line similar to this one:
  printf("%010f", 1.0 / 0.0);
Linux produces and passes the test with this output:
  "       inf"
but current CVS version of _doprnt() produces this output:
  "0000000Inf"
The following patch should fix the issue.

Regards,
Juan Manuel Guerrero



diff -aprNU3 djgpp.orig/src/libc/ansi/stdio/doprnt.c djgpp/src/libc/ansi/stdio/doprnt.c
--- djgpp.orig/src/libc/ansi/stdio/doprnt.c	2007-12-11 07:27:40 +0000
+++ djgpp/src/libc/ansi/stdio/doprnt.c	2008-03-14 23:02:34 +0000
@@ -246,6 +246,14 @@ _doprnt(const char *fmt0, va_list argp, 
 	_ldouble = va_arg(argp, long double);
       else
 	_ldouble = (long double)va_arg(argp, double);
+      if (flags & ZEROPAD)
+      {
+        _longdouble_union_t ip;
+
+        ip.ld = _ldouble;
+        if (ip.ldt.exponent == 0x7fff)
+          flags &= ~ZEROPAD;
+      }
       /*
        * don't do unrealistic precision; just pad it with
        * zeroes later, so buffer size stays rational.