Imported Upstream version 93u+upstream

1 files changed, 83 insertions, 0 deletions

diff --git a/src/lib/libast/sfio/sfresize.c b/src/lib/libast/sfio/sfresize.c
new file mode 100644
index 0000000..ae5c83c
--- /dev/null
+++ b/src/lib/libast/sfio/sfresize.c
@@ -0,0 +1,83 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#include	"sfhdr.h"
+
+/*	Resize a stream.
+	Written by Kiem-Phong Vo.
+*/
+
+#if __STD_C
+int sfresize(Sfio_t* f, Sfoff_t size)
+#else
+int sfresize(f, size)
+Sfio_t*		f;
+Sfoff_t		size;
+#endif
+{
+	SFMTXDECL(f);
+
+	SFMTXENTER(f, -1);
+
+	if(size < 0 || f->extent < 0 ||
+	   (f->mode != SF_WRITE && _sfmode(f,SF_WRITE,0) < 0) )
+		SFMTXRETURN(f, -1);
+
+	SFLOCK(f,0);
+
+	if(f->flags&SF_STRING)
+	{	SFSTRSIZE(f);
+
+		if(f->extent >= size)
+		{	if((f->flags&SF_MALLOC) && (f->next - f->data) <= size)
+			{	size_t	s = (((size_t)size + 1023)/1024)*1024;
+				Void_t*	d;
+				if(s < f->size && (d = realloc(f->data, s)) )
+				{	f->data = d;
+					f->size = s;
+					f->extent = s;
+				}
+			}
+			memclear((char*)(f->data+size), (int)(f->extent-size));
+		}
+		else
+		{	if(SFSK(f, size, SEEK_SET, f->disc) != size)
+				SFMTXRETURN(f, -1);
+			memclear((char*)(f->data+f->extent), (int)(size-f->extent));
+		}
+	}
+	else
+	{	if(f->next > f->data)
+			SFSYNC(f);
+#if _lib_ftruncate
+		if(ftruncate(f->file, (sfoff_t)size) < 0)
+			SFMTXRETURN(f, -1);
+#else
+		SFMTXRETURN(f, -1);
+#endif
+	}
+
+	f->extent = size;
+
+	SFOPEN(f, 0);
+
+	SFMTXRETURN(f, 0);
+}