Re-add macro versions of getc(), getchar(), putc(), putchar(), feof(),

ferror(), fileno() and clearerr(), using the value of __isthreaded to
decide between the fast inline single-threaded code and the more
general function equivalent. This gives most of the performance
benefits of the old unsafe macros while preserving thread safety.

include/stdio.h

@@ -416,6 +416,22 @@ static __inline int __sputc(int _c, FILE *_p) {
 #define	__sclearerr(p)	((void)((p)->_flags &= ~(__SERR|__SEOF)))
 #define	__sfileno(p)	((p)->_file)
 
+extern int __isthreaded;
+
+#define	feof(p)		(!__isthreaded ? __sfeof(p) : feof(p))
+#define	ferror(p)	(!__isthreaded ? __sferror(p) : ferror(p))
+#define	clearerr(p)	(!__isthreaded ? __sclearerr(p) : clearerr(p))
+
+#if __POSIX_VISIBLE
+#define	fileno(p)	(!__isthreaded ? __sfileno(p) : fileno(p))
+#endif
+
+#define	getc(fp)	(!__isthreaded ? __sgetc(fp) : getc(fp))
+#define	putc(x, fp)	(!__isthreaded ? __sputc(x, fp) : putc(x, fp))
+
+#define	getchar()	getc(stdin)
+#define	putchar(x)	putc(x, stdout)
+
 #if __BSD_VISIBLE
 /*
  * See ISO/IEC 9945-1 ANSI/IEEE Std 1003.1 Second Edition 1996-07-12

lib/libc/stdio/feof.c

@@ -45,12 +45,8 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 #include "libc_private.h"
 
-/*
- * feof has traditionally been a macro in <stdio.h>.  That is no
- * longer true because it needs to be thread-safe.
- *
- * #undef feof
- */
+#undef feof
+
 int
 feof(FILE *fp)
 {

lib/libc/stdio/ferror.c

@@ -45,12 +45,8 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 #include "libc_private.h"
 
-/*
- * ferror has traditionally been a macro in <stdio.h>.  That is no
- * longer true because it needs to be thread-safe.
- *
- * #undef ferror
- */
+#undef ferror
+
 int
 ferror(FILE *fp)
 {

lib/libc/stdio/fileno.c

@@ -45,12 +45,8 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 #include "libc_private.h"
 
-/*
- * fileno has traditionally been a macro in <stdio.h>.  That is
- * no longer true because it needs to be thread-safe.
- *
- * #undef fileno
- */
+#undef fileno
+
 int
 fileno(FILE *fp)
 {

lib/libc/stdio/getc.c

@@ -46,6 +46,8 @@ __FBSDID("$FreeBSD$");
 #include "libc_private.h"
 #include "local.h"
 
+#undef getc
+
 int
 getc(FILE *fp)
 {

lib/libc/stdio/putc.c

@@ -46,14 +46,8 @@ __FBSDID("$FreeBSD$");
 #include "local.h"
 #include "libc_private.h"
 
-/*
- * putc has traditionally been a macro in <stdio.h>.  That is no
- * longer true because POSIX requires it to be thread-safe.  POSIX
- * does define putc_unlocked() which is defined as a macro and is
- * probably what you want to use instead.
- *
- * #undef putc
- */
+#undef putc
+
 int
 putc(c, fp)
 	int c;

lib/libc/stdio/putchar.c

@@ -46,14 +46,8 @@ __FBSDID("$FreeBSD$");
 #include "local.h"
 #include "libc_private.h"
 
-/*
- * putchar has traditionally been a macro in <stdio.h>.  That is no
- * longer true because POSIX requires it to be thread-safe.  POSIX
- * does define putchar_unlocked() which is defined as a macro and is
- * probably what you want to use instead.
- *
- * #undef putchar
- */
+#undef putchar
+
 /*
  * A subroutine version of the macro putchar
  */