PR libstdc++/13731 (first part: write)

2004-02-11  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/13731 (first part: write)
	* config/io/basic_file_stdio.h (__basic_file<char>::xwrite):
	New, declare.
	* config/io/basic_file_stdio.cc (__basic_file<char>::xwrite):
	Define it: a wrapper around write() handling partial write.
	(__basic_file<char>::xsputn): Use it.
	(__basic_file<char>::xsputn_2): Likewise.

From-SVN: r77680

libstdc++-v3/ChangeLog

 2004-02-11  Paolo Carlini  <pcarlini@suse.de>
+
+	PR libstdc++/13731 (first part: write)
+	* config/io/basic_file_stdio.h (__basic_file<char>::xwrite):
+	New, declare.
+	* config/io/basic_file_stdio.cc (__basic_file<char>::xwrite):
+	Define it: a wrapper around write() handling partial write.
+	(__basic_file<char>::xsputn): Use it.
+	(__basic_file<char>::xsputn_2): Likewise.
+
+2004-02-11  Paolo Carlini  <pcarlini@suse.de>
 	    Petur Runolfsson  <peturr02@ru.is>
 
 	PR libstdc++/14078

libstdc++-v3/config/io/basic_file_stdio.cc

@@ -200,16 +200,28 @@ namespace std
     while (__ret == -1L && errno == EINTR);
     return __ret;
   }
-    
-  streamsize 
-  __basic_file<char>::xsputn(const char* __s, streamsize __n)
+
+  // Wrapper handling partial write.
+  streamsize
+  __basic_file<char>::xwrite(const char* __s, streamsize __n)
   {
-    streamsize __ret;
-    do
-      __ret = write(this->fd(), __s, __n);
-    while (__ret == -1L && errno == EINTR);
-    return __ret;
+    streamsize __nleft = __n;
+    while (__nleft > 0)
+      {
+	const streamsize __ret = write(this->fd(), __s, __nleft);
+	if (__ret == -1L && errno == EINTR)
+	  continue;
+	else if (__ret == -1L)
+	  break;
+	__nleft -= __ret;
+	__s += __ret;
+      }
+    return __n - __nleft;
   }
+ 
+  streamsize 
+  __basic_file<char>::xsputn(const char* __s, streamsize __n)
+  { return __basic_file<char>::xwrite(__s, __n); }
 
   streamsize 
   __basic_file<char>::xsputn_2(const char* __s1, streamsize __n1,
@@ -228,19 +240,10 @@ namespace std
     while (__ret == -1L && errno == EINTR);
 #else
     if (__n1)
-      do
-	__ret = write(this->fd(), __s1, __n1);
-      while (__ret == -1L && errno == EINTR);
+      __ret = __basic_file<char>::xwrite(__s1, __n1);
 
     if (__ret == __n1)
-      {
-	do
-	  __ret = write(this->fd(), __s2, __n2);
-	while (__ret == -1L && errno == EINTR);
-	
-	if (__ret != -1L)
-	  __ret += __n1;
-      }
+      __ret += __basic_file<char>::xwrite(__s2, __n2);
 #endif
     return __ret;
   }

libstdc++-v3/config/io/basic_file_stdio.h

@@ -84,6 +84,9 @@ namespace std
       ~__basic_file();
 
       streamsize 
+      xwrite(const char* __s, streamsize __n);
+
+      streamsize 
       xsputn(const char* __s, streamsize __n);
 
       streamsize