Remove duplicated code from __printf_fp_l, __printf_fphex, and __printf_size

In __printf_fp_l, __printf_fphex, and __printf_size the blocks of code that are
used to read a double or long double argument, check for special values and
convert to multiprecision are similar.  When adding float128 support to libc,
more code would be duplicated to deal with the extra type.  This patch moves
the repetitive code to a macro which is now used by double and long double and
will be used for float128 when support is added, thus avoiding more
duplication.

Tested for powerpc64le and s390x.

	* stdio-common/printf_fp.c (PRINTF_FP_FETCH): New macro.
	(__printf_fp_l): Use the new macro to avoid duplicating code.
	* stdio-common/printf_fphex.c (PRINTF_FPHEX_FETCH): New macro.
	(__printf_fphex): Use the new macro to avoid duplicating code.
	* stdio-common/printf_size.c (PRINTF_SIZE_FETCH): New macro.
	(__printf_size): Use the new macro to avoid duplicating code.

4 files changed, 125 insertions, 199 deletions

diff --git a/ChangeLog b/ChangeLog
index 0b75c87852..429fe418da 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,14 @@
 2017-06-07  Gabriel F. T. Gomes  <gftg@linux.vnet.ibm.com>
 
+	* stdio-common/printf_fp.c (PRINTF_FP_FETCH): New macro.
+	(__printf_fp_l): Use the new macro to avoid duplicating code.
+	* stdio-common/printf_fphex.c (PRINTF_FPHEX_FETCH): New macro.
+	(__printf_fphex): Use the new macro to avoid duplicating code.
+	* stdio-common/printf_size.c (PRINTF_SIZE_FETCH): New macro.
+	(__printf_size): Use the new macro to avoid duplicating code.
+
+2017-06-07  Gabriel F. T. Gomes  <gftg@linux.vnet.ibm.com>
+
 	* include/gmp.h: Include bits/floatn.h
 	(__mpn_extract_float128): Declare when __HAVE_DISTINCT_FLOAT128 is 1.
 	* stdlib/gmp-impl.h: Also check if alloca is not defined before
diff --git a/stdio-common/printf_fp.c b/stdio-common/printf_fp.c
index 7845d9635c..65ee9a7937 100644
--- a/stdio-common/printf_fp.c
+++ b/stdio-common/printf_fp.c
@@ -327,94 +327,58 @@ __printf_fp_l (FILE *fp, locale_t loc,
   else
     grouping = NULL;
 
+#define PRINTF_FP_FETCH(FLOAT, VAR, SUFFIX, MANT_DIG)			\
+  {									\
+    (VAR) = *(const FLOAT *) args[0];					\
+									\
+    /* Check for special values: not a number or infinity.  */		\
+    if (isnan (VAR))							\
+      {									\
+	is_neg = signbit (VAR);						\
+	if (isupper (info->spec))					\
+	  {								\
+	    special = "NAN";						\
+	    wspecial = L"NAN";						\
+	  }								\
+	else								\
+	  {								\
+	    special = "nan";						\
+	    wspecial = L"nan";						\
+	  }								\
+      }									\
+    else if (isinf (VAR))						\
+      {									\
+	is_neg = signbit (VAR);						\
+	if (isupper (info->spec))					\
+	  {								\
+	    special = "INF";						\
+	    wspecial = L"INF";						\
+	  }								\
+	else								\
+	  {								\
+	    special = "inf";						\
+	    wspecial = L"inf";						\
+	  }								\
+      }									\
+    else								\
+      {									\
+	p.fracsize = __mpn_extract_##SUFFIX				\
+		     (fp_input,						\
+		      (sizeof (fp_input) / sizeof (fp_input[0])),	\
+		      &p.exponent, &is_neg, VAR);			\
+	to_shift = 1 + p.fracsize * BITS_PER_MP_LIMB - MANT_DIG;	\
+      }									\
+  }
+
   /* Fetch the argument value.	*/
 #ifndef __NO_LONG_DOUBLE_MATH
   if (info->is_long_double && sizeof (long double) > sizeof (double))
-    {
-      fpnum.ldbl = *(const long double *) args[0];
-
-      /* Check for special values: not a number or infinity.  */
-      if (isnan (fpnum.ldbl))
-	{
-	  is_neg = signbit (fpnum.ldbl);
-	  if (isupper (info->spec))
-	    {
-	      special = "NAN";
-	      wspecial = L"NAN";
-	    }
-	    else
-	      {
-		special = "nan";
-		wspecial = L"nan";
-	      }
-	}
-      else if (isinf (fpnum.ldbl))
-	{
-	  is_neg = signbit (fpnum.ldbl);
-	  if (isupper (info->spec))
-	    {
-	      special = "INF";
-	      wspecial = L"INF";
-	    }
-	  else
-	    {
-	      special = "inf";
-	      wspecial = L"inf";
-	    }
-	}
-      else
-	{
-	  p.fracsize = __mpn_extract_long_double (fp_input,
-						(sizeof (fp_input) /
-						 sizeof (fp_input[0])),
-						&p.exponent, &is_neg,
-						fpnum.ldbl);
-	  to_shift = 1 + p.fracsize * BITS_PER_MP_LIMB - LDBL_MANT_DIG;
-	}
-    }
+    PRINTF_FP_FETCH (long double, fpnum.ldbl, long_double, LDBL_MANT_DIG)
   else
-#endif	/* no long double */
-    {
-      fpnum.dbl = *(const double *) args[0];
+#endif
+    PRINTF_FP_FETCH (double, fpnum.dbl, double, DBL_MANT_DIG)
 
-      /* Check for special values: not a number or infinity.  */
-      if (isnan (fpnum.dbl))
-	{
-	  is_neg = signbit (fpnum.dbl);
-	  if (isupper (info->spec))
-	    {
-	      special = "NAN";
-	      wspecial = L"NAN";
-	    }
-	  else
-	    {
-	      special = "nan";
-	      wspecial = L"nan";
-	    }
-	}
-      else if (isinf (fpnum.dbl))
-	{
-	  is_neg = signbit (fpnum.dbl);
-	  if (isupper (info->spec))
-	    {
-	      special = "INF";
-	      wspecial = L"INF";
-	    }
-	  else
-	    {
-	      special = "inf";
-	      wspecial = L"inf";
-	    }
-	}
-      else
-	{
-	  p.fracsize = __mpn_extract_double (fp_input,
-					   (sizeof (fp_input)
-					    / sizeof (fp_input[0])),
-					   &p.exponent, &is_neg, fpnum.dbl);
-	  to_shift = 1 + p.fracsize * BITS_PER_MP_LIMB - DBL_MANT_DIG;
-	}
-    }
+#undef PRINTF_FP_FETCH
 
   if (special)
     {
diff --git a/stdio-common/printf_fphex.c b/stdio-common/printf_fphex.c
index b207e007f8..7b469c047e 100644
--- a/stdio-common/printf_fphex.c
+++ b/stdio-common/printf_fphex.c
@@ -157,82 +157,52 @@ __printf_fphex (FILE *fp,
   /* The decimal point character must never be zero.  */
   assert (*decimal != '\0' && decimalwc != L'\0');
 
+#define PRINTF_FPHEX_FETCH(FLOAT, VAR)					\
+  {									\
+    (VAR) = *(const FLOAT *) args[0];					\
+									\
+    /* Check for special values: not a number or infinity.  */		\
+    if (isnan (VAR))							\
+      {									\
+	if (isupper (info->spec))					\
+	  {								\
+	    special = "NAN";						\
+	    wspecial = L"NAN";						\
+	  }								\
+	else								\
+	  {								\
+	    special = "nan";						\
+	    wspecial = L"nan";						\
+	  }								\
+      }									\
+    else								\
+      {									\
+	if (isinf (VAR))						\
+	  {								\
+	    if (isupper (info->spec))					\
+	      {								\
+		special = "INF";					\
+		wspecial = L"INF";					\
+	      }								\
+	    else							\
+	      {								\
+		special = "inf";					\
+		wspecial = L"inf";					\
+	      }								\
+	  }								\
+      }									\
+    negative = signbit (VAR);						\
+  }
 
   /* Fetch the argument value.	*/
 #ifndef __NO_LONG_DOUBLE_MATH
   if (info->is_long_double && sizeof (long double) > sizeof (double))
-    {
-      fpnum.ldbl = *(const long double *) args[0];
-
-      /* Check for special values: not a number or infinity.  */
-      if (isnan (fpnum.ldbl))
-	{
-	  if (isupper (info->spec))
-	    {
-	      special = "NAN";
-	      wspecial = L"NAN";
-	    }
-	  else
-	    {
-	      special = "nan";
-	      wspecial = L"nan";
-	    }
-	}
-      else
-	{
-	  if (isinf (fpnum.ldbl))
-	    {
-	      if (isupper (info->spec))
-		{
-		  special = "INF";
-		  wspecial = L"INF";
-		}
-	      else
-		{
-		  special = "inf";
-		  wspecial = L"inf";
-		}
-	    }
-	}
-      negative = signbit (fpnum.ldbl);
-    }
+    PRINTF_FPHEX_FETCH (long double, fpnum.ldbl)
   else
-#endif	/* no long double */
-    {
-      fpnum.dbl.d = *(const double *) args[0];
+#endif
+    PRINTF_FPHEX_FETCH (double, fpnum.dbl.d)
 
-      /* Check for special values: not a number or infinity.  */
-      if (isnan (fpnum.dbl.d))
-	{
-	  if (isupper (info->spec))
-	    {
-	      special = "NAN";
-	      wspecial = L"NAN";
-	    }
-	  else
-	    {
-	      special = "nan";
-	      wspecial = L"nan";
-	    }
-	}
-      else
-	{
-	  if (isinf (fpnum.dbl.d))
-	    {
-	      if (isupper (info->spec))
-		{
-		  special = "INF";
-		  wspecial = L"INF";
-		}
-	      else
-		{
-		  special = "inf";
-		  wspecial = L"inf";
-		}
-	    }
-	}
-      negative = signbit (fpnum.dbl.d);
-    }
+#undef PRINTF_FPHEX_FETCH
 
   if (special)
     {
diff --git a/stdio-common/printf_size.c b/stdio-common/printf_size.c
index 9403aea07c..bc953dc53c 100644
--- a/stdio-common/printf_size.c
+++ b/stdio-common/printf_size.c
@@ -118,57 +118,40 @@ __printf_size (FILE *fp, const struct printf_info *info,
   int done = 0;
   int wide = info->wide;
 
+#define PRINTF_SIZE_FETCH(FLOAT, VAR)					\
+  {									\
+    (VAR) = *(const FLOAT *) args[0];					\
+									\
+    /* Check for special values: not a number or infinity.  */		\
+    if (isnan (VAR))							\
+      {									\
+	special = "nan";						\
+	wspecial = L"nan";						\
+	/* is_neg = 0; Already zero */					\
+      }									\
+    else if (isinf (VAR))						\
+      {									\
+	is_neg = signbit (VAR);						\
+	special = "inf";						\
+	wspecial = L"inf";						\
+      }									\
+    else								\
+      while ((VAR) >= divisor && tag[1] != '\0')			\
+	{								\
+	  (VAR) /= divisor;						\
+	  ++tag;							\
+	}								\
+  }
+
   /* Fetch the argument value.	*/
 #ifndef __NO_LONG_DOUBLE_MATH
   if (info->is_long_double && sizeof (long double) > sizeof (double))
-    {
-      fpnum.ldbl = *(const long double *) args[0];
-
-      /* Check for special values: not a number or infinity.  */
-      if (isnan (fpnum.ldbl))
-	{
-	  special = "nan";
-	  wspecial = L"nan";
-	  // is_neg = 0;	Already zero
-	}
-      else if (isinf (fpnum.ldbl))
-	{
-	  is_neg = signbit (fpnum.ldbl);
-	  special = "inf";
-	  wspecial = L"inf";
-	}
-      else
-	while (fpnum.ldbl >= divisor && tag[1] != '\0')
-	  {
-	    fpnum.ldbl /= divisor;
-	    ++tag;
-	  }
-    }
+    PRINTF_SIZE_FETCH (long double, fpnum.ldbl)
   else
-#endif	/* no long double */
-    {
-      fpnum.dbl.d = *(const double *) args[0];
+#endif
+    PRINTF_SIZE_FETCH (double, fpnum.dbl.d)
 
-      /* Check for special values: not a number or infinity.  */
-      if (isnan (fpnum.dbl.d))
-	{
-	  special = "nan";
-	  wspecial = L"nan";
-	  // is_neg = 0;	Already zero
-	}
-      else if (isinf (fpnum.dbl.d))
-	{
-	  is_neg = signbit (fpnum.dbl.d);
-	  special = "inf";
-	  wspecial = L"inf";
-	}
-      else
-	while (fpnum.dbl.d >= divisor && tag[1] != '\0')
-	  {
-	    fpnum.dbl.d /= divisor;
-	    ++tag;
-	  }
-    }
+#undef PRINTF_SIZE_FETCH
 
   if (special)
     {