Add non-macro stdin/stdout/stderr too.

Various C and C++ standards explicitly say that stdin/stdout/stderr
should be macros, but glibc makes them global variables too. This
means it's possible to write code that uses those names as locals,
but that code (toybox being an example) won't build on bionic.

If we'd done this earlier, we could have hidden __sF for LP64, but
it's too late now.

Change-Id: I90cf8c73f52b66e1760b8fa2e135b9f9f9651230

3 files changed, 13 insertions, 9 deletions

diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index a7ec615..c0dac1a 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -146,7 +146,16 @@ typedef	struct __sFILE {
 	fpos_t	_offset;	/* current lseek offset */
 } FILE;
 
+/* Legacy BSD implementation of stdin/stdout/stderr. */
 extern FILE __sF[];
+/* More obvious implementation. */
+extern FILE* stdin;
+extern FILE* stdout;
+extern FILE* stderr;
+/* C99 and earlier plus current C++ standards say these must be macros. */
+#define stdin stdin
+#define stdout stdout
+#define stderr stderr
 
 #define	__SLBF	0x0001		/* line buffered */
 #define	__SNBF	0x0002		/* unbuffered */
@@ -209,10 +218,6 @@ extern FILE __sF[];
 #define	SEEK_END	2	/* set file offset to EOF plus offset */
 #endif
 
-#define	stdin	(&__sF[0])
-#define	stdout	(&__sF[1])
-#define	stderr	(&__sF[2])
-
 /*
  * Functions defined in ANSI C standard.
  */
diff --git a/libc/stdio/fileext.h b/libc/stdio/fileext.h
index 7efff8f..dc89fff 100644
--- a/libc/stdio/fileext.h
+++ b/libc/stdio/fileext.h
@@ -43,10 +43,6 @@ struct __sfileext {
 	pthread_mutex_t _lock; /* file lock */
 };
 
-__LIBC_HIDDEN__ extern struct __sfileext __sFext[3];
-
-#define _FILEEXT_INITIALIZER  {{NULL,0},{0},PTHREAD_RECURSIVE_MUTEX_INITIALIZER}
-
 #define _EXT(fp) ((struct __sfileext *)((fp)->_ext._base))
 #define _UB(fp) _EXT(fp)->_ub
 #define _FLOCK(fp)  _EXT(fp)->_lock
diff --git a/libc/stdio/findfp.c b/libc/stdio/findfp.c
index ef8e9e6..5e51198 100644
--- a/libc/stdio/findfp.c
+++ b/libc/stdio/findfp.c
@@ -59,12 +59,15 @@ static struct glue uglue = { 0, FOPEN_MAX - 3, usual };
 static struct glue *lastglue = &uglue;
 _THREAD_PRIVATE_MUTEX(__sfp_mutex);
 
-struct __sfileext __sFext[3];
+static struct __sfileext __sFext[3];
 FILE __sF[3] = {
 	std(__SRD, STDIN_FILENO),		/* stdin */
 	std(__SWR, STDOUT_FILENO),		/* stdout */
 	std(__SWR|__SNBF, STDERR_FILENO)	/* stderr */
 };
+FILE* stdin = &__sF[0];
+FILE* stdout = &__sF[1];
+FILE* stderr = &__sF[2];
 struct glue __sglue = { &uglue, 3, __sF };
 
 static struct glue *