Use unlocked I/O for a minor performance improvement on hosts like

GNU/Linux and Solaris that support unlocked I/O.  The basic idea
is to use the gnlib unlocked-io module, and to prefer putc and
puts to printf when either will work (since the latter doesn't
come in an unlocked flavor).
* bootstrap (gnulib_modules): Add unlocked-io.
* data/c.m4 (yysymprint): Prefer puts and putc to printf.
* data/glr.c (YYFPUTC, YYFPUTS, YYDPUTS): New macros.
Prefer them to YYFPRINTF and YYDPRINTF if either will do,
and similarly for puts and putc and printf.
* data/yacc.c: Likewise.
* lib/bitset.c (bitset_print): Likewise.
* lib/bitset.h [USE_UNLOCKED_IO]: Include unlocked-io.h.
* lib/bitsetv.c (bitsetv_dump, debug-bitsetv): Prefer putc and puts
to printf.
* lib/lbitset.c (debug_lbitset): Likewise.
* src/closure.c (print_firsts, print_fderives): Likewise.
* src/gram.c (grammar_dump): Likewise.
* src/lalr.c (look_ahead_tokens_print): Likewise.
* src/output.c (escaped_output): Likewise.
(user_actions_output): Coalesce two printfs.
* src/parse-gram.h (%printer): Prefer putc and puts to printf.
* src/reduce.c (reduce_print): Likewise.
* src/state.c (state_rule_look_ahead_tokens_print): Likewise.
* src/system.h: Include unlocked-io.h rathe than stdio.h.

lib/bitset.c

@@ -303,7 +303,7 @@ bitset_print (FILE *file, bitset bset, bool verbose)
   {
     if (pos > 70)
       {
-	fprintf (file, "\n");
+	fputc ('\n', file);
 	pos = 0;
       }
 
@@ -312,7 +312,7 @@ bitset_print (FILE *file, bitset bset, bool verbose)
   };
 
   if (verbose)
-    fprintf (file, "}\n");
+    fputs ("}\n", file);
 }
 
 

lib/bitset.h

@@ -26,6 +26,10 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #include "obstack.h"
 #include <stdio.h>
 
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+#endif
+
 /* Attributes used to select a bitset implementation.  */
 enum bitset_attr {BITSET_FIXED = 1,    /* Bitset size fixed.  */
 		  BITSET_VARIABLE = 2, /* Bitset size variable.  */

lib/bitsetv.c

@@ -153,7 +153,7 @@ bitsetv_dump (FILE *file, char const *title, char const *subtitle,
       bitset_dump (file, bsetv[i]);
     }
 
-  fprintf (file, "\n");
+  fputc ('\n', file);
 }
 
 
@@ -168,5 +168,5 @@ debug_bitsetv (bitsetv bsetv)
       debug_bitset (bsetv[i]);
     }
 
-  fprintf (stderr, "\n");
+  fputc ('\n', stderr);
 }

lib/lbitset.c

@@ -1400,7 +1400,7 @@ debug_lbitset (bitset bset)
 	  for (j = 0; j < LBITSET_WORD_BITS; j++)
 	    if ((word & ((bitset_word) 1 << j)))
 	      fprintf (stderr, " %u", j);
-	  fprintf (stderr, "\n");
+	  fputc ('\n', stderr);
 	}
     }
 }