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Date:      Sun, 8 Nov 2015 13:37:16 +0000 (UTC)
From:      "Andrey A. Chernov" <ache@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org
Subject:   svn commit: r290544 - in stable/10: include lib/libc/stdio
Message-ID:  <201511081337.tA8DbGEL072196@repo.freebsd.org>

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Author: ache
Date: Sun Nov  8 13:37:16 2015
New Revision: 290544
URL: https://svnweb.freebsd.org/changeset/base/290544

Log:
  MFC: 	r289863,r289931,r290110,r290230,r290231,r290232
  
  r290232:
  
  Microoptimize.
  
  r290231:
  
  Addition to prev. commit.
  In some edge cases fp->_p can be changed in _sseek(), recalculate.
  
  r290230:
  
  Don't seek to the end if write buffer is empty (in append modes).
  PR:     204156
  
  r290110:
  
  Add _flags2 per jhb@ suggestion since no room left in _flags.
  Rewrite O_APPEND flag checking using new __S2OAP flag.
  
  r289931:
  
  According to POSIX, a write operation shall start at the current size of
  the stream (if mode had 'a' as the first character).
  
  r289863:
  
  Since no room left in the _flags, reuse __SALC for O_APPEND.
  It helps to remove _fcntl() call from _ftello() and optimize seek position
  calculation in _swrite().

Modified:
  stable/10/include/stdio.h
  stable/10/lib/libc/stdio/fdopen.c
  stable/10/lib/libc/stdio/findfp.c
  stable/10/lib/libc/stdio/fmemopen.c
  stable/10/lib/libc/stdio/fopen.c
  stable/10/lib/libc/stdio/freopen.c
  stable/10/lib/libc/stdio/ftell.c
  stable/10/lib/libc/stdio/stdio.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/include/stdio.h
==============================================================================
--- stable/10/include/stdio.h	Sun Nov  8 12:24:19 2015	(r290543)
+++ stable/10/include/stdio.h	Sun Nov  8 13:37:16 2015	(r290544)
@@ -144,6 +144,7 @@ struct __sFILE {
 	int	_fl_count;	/* recursive lock count */
 	int	_orientation;	/* orientation for fwide() */
 	__mbstate_t _mbstate;	/* multibyte conversion state */
+	int	_flags2;	/* additional flags */
 };
 #ifndef _STDFILE_DECLARED
 #define _STDFILE_DECLARED
@@ -176,6 +177,8 @@ __END_DECLS
 #define	__SALC	0x4000		/* allocate string space dynamically */
 #define	__SIGN	0x8000		/* ignore this file in _fwalk */
 
+#define	__S2OAP	0x0001		/* O_APPEND mode is set */
+
 /*
  * The following three definitions are for ANSI C, which took them
  * from System V, which brilliantly took internal interface macros and

Modified: stable/10/lib/libc/stdio/fdopen.c
==============================================================================
--- stable/10/lib/libc/stdio/fdopen.c	Sun Nov  8 12:24:19 2015	(r290543)
+++ stable/10/lib/libc/stdio/fdopen.c	Sun Nov  8 13:37:16 2015	(r290544)
@@ -90,7 +90,9 @@ fdopen(int fd, const char *mode)
 	 * O_APPEND bit set, assert __SAPP so that __swrite() caller
 	 * will _sseek() to the end before write.
 	 */
-	if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
+	if (fdflags & O_APPEND)
+		fp->_flags2 |= __S2OAP;
+	else if (oflags & O_APPEND)
 		fp->_flags |= __SAPP;
 	fp->_file = fd;
 	fp->_cookie = fp;

Modified: stable/10/lib/libc/stdio/findfp.c
==============================================================================
--- stable/10/lib/libc/stdio/findfp.c	Sun Nov  8 12:24:19 2015	(r290543)
+++ stable/10/lib/libc/stdio/findfp.c	Sun Nov  8 13:37:16 2015	(r290544)
@@ -155,6 +155,7 @@ found:
 /*	fp->_fl_mutex = NULL; */ /* once set always set (reused) */
 	fp->_orientation = 0;
 	memset(&fp->_mbstate, 0, sizeof(mbstate_t));
+	fp->_flags2 = 0;
 	return (fp);
 }
 

Modified: stable/10/lib/libc/stdio/fmemopen.c
==============================================================================
--- stable/10/lib/libc/stdio/fmemopen.c	Sun Nov  8 12:24:19 2015	(r290543)
+++ stable/10/lib/libc/stdio/fmemopen.c	Sun Nov  8 13:37:16 2015	(r290544)
@@ -149,6 +149,9 @@ fmemopen(void * __restrict buf, size_t s
 		return (NULL);
 	}
 
+	if (mode[0] == 'a')
+		f->_flags |= __SAPP;
+
 	/*
 	 * Turn off buffering, so a write past the end of the buffer
 	 * correctly returns a short object count.

Modified: stable/10/lib/libc/stdio/fopen.c
==============================================================================
--- stable/10/lib/libc/stdio/fopen.c	Sun Nov  8 12:24:19 2015	(r290543)
+++ stable/10/lib/libc/stdio/fopen.c	Sun Nov  8 13:37:16 2015	(r290544)
@@ -91,7 +91,9 @@ fopen(const char * __restrict file, cons
 	 * we can do about this.  (We could set __SAPP and check in
 	 * fseek and ftell.)
 	 */
-	if (oflags & O_APPEND)
+	if (oflags & O_APPEND) {
+		fp->_flags2 |= __S2OAP;
 		(void)_sseek(fp, (fpos_t)0, SEEK_END);
+	}
 	return (fp);
 }

Modified: stable/10/lib/libc/stdio/freopen.c
==============================================================================
--- stable/10/lib/libc/stdio/freopen.c	Sun Nov  8 12:24:19 2015	(r290543)
+++ stable/10/lib/libc/stdio/freopen.c	Sun Nov  8 13:37:16 2015	(r290544)
@@ -186,6 +186,7 @@ finish:
 	fp->_lb._size = 0;
 	fp->_orientation = 0;
 	memset(&fp->_mbstate, 0, sizeof(mbstate_t));
+	fp->_flags2 = 0;
 
 	if (f < 0) {			/* did not get it after all */
 		if (isopen)
@@ -239,8 +240,10 @@ finish:
 	 * we can do about this.  (We could set __SAPP and check in
 	 * fseek and ftell.)
 	 */
-	if (oflags & O_APPEND)
+	if (oflags & O_APPEND) {
+		fp->_flags2 |= __S2OAP;
 		(void) _sseek(fp, (fpos_t)0, SEEK_END);
+	}
 	FUNLOCKFILE(fp);
 	return (fp);
 }

Modified: stable/10/lib/libc/stdio/ftell.c
==============================================================================
--- stable/10/lib/libc/stdio/ftell.c	Sun Nov  8 12:24:19 2015	(r290543)
+++ stable/10/lib/libc/stdio/ftell.c	Sun Nov  8 13:37:16 2015	(r290544)
@@ -88,7 +88,6 @@ _ftello(FILE *fp, fpos_t *offset)
 {
 	fpos_t pos;
 	size_t n;
-	int dflags;
 
 	if (fp->_seek == NULL) {
 		errno = ESPIPE;			/* historic practice */
@@ -119,29 +118,33 @@ _ftello(FILE *fp, fpos_t *offset)
 		}
 		if (HASUB(fp))
 			pos -= fp->_r;  /* Can be negative at this point. */
-	} else if ((fp->_flags & __SWR) && fp->_p != NULL) {
-		dflags = 0;
-		if (fp->_flags & __SAPP)
-			dflags = O_APPEND;
-		else if (fp->_file != -1 &&
-			 (dflags = _fcntl(fp->_file, F_GETFL)) < 0)
-			return (1);
-		if ((dflags & O_APPEND) &&
-		    (pos = _sseek(fp, (fpos_t)0, SEEK_END)) == -1) {
-			if ((fp->_flags & __SOPT) || __sflush(fp) ||
-			    (pos = _sseek(fp, (fpos_t)0, SEEK_CUR)) == -1)
-				return (1);
-			else {
-				*offset = pos;
-				return (0);
-			}
-		}
+	} else if ((fp->_flags & __SWR) && fp->_p != NULL &&
+	    (n = fp->_p - fp->_bf._base) > 0) {
 		/*
 		 * Writing.  Any buffered characters cause the
 		 * position to be greater than that in the
 		 * underlying object.
 		 */
-		n = fp->_p - fp->_bf._base;
+		if ((fp->_flags & __SAPP) || (fp->_flags2 & __S2OAP)) {
+			int serrno = errno;
+
+			errno = 0;
+			if ((pos = _sseek(fp, (fpos_t)0, SEEK_END)) == -1) {
+				if (errno == ESPIPE ||
+				    (fp->_flags & __SOPT) || __sflush(fp) ||
+				    (pos =
+				    _sseek(fp, (fpos_t)0, SEEK_CUR)) == -1)
+					return (1);
+				else {
+					errno = serrno;
+					*offset = pos;
+					return (0);
+				}
+			}
+			errno = serrno;
+			/* fp->_p can be changed in _sseek(), recalculate. */
+			n = fp->_p - fp->_bf._base;
+		}
 		if (pos > OFF_MAX - n) {
 			errno = EOVERFLOW;
 			return (1);

Modified: stable/10/lib/libc/stdio/stdio.c
==============================================================================
--- stable/10/lib/libc/stdio/stdio.c	Sun Nov  8 12:24:19 2015	(r290543)
+++ stable/10/lib/libc/stdio/stdio.c	Sun Nov  8 13:37:16 2015	(r290544)
@@ -117,7 +117,7 @@ _swrite(FILE *fp, char const *buf, int n
 	ret = (*fp->_write)(fp->_cookie, buf, n);
 	/* __SOFF removed even on success in case O_APPEND mode is set. */
 	if (ret >= 0) {
-		if ((fp->_flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) &&
+		if ((fp->_flags & __SOFF) && !(fp->_flags2 & __S2OAP) &&
 		    fp->_offset <= OFF_MAX - ret)
 			fp->_offset += ret;
 		else



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