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git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14685 87f5fb63-7c3d-0410-a384-fd976d0f7a62

library/stdio_vsnprintf.c

@@ -0,0 +1,120 @@
+/*
+ * $Id: stdio_vsnprintf.c,v 1.1.1.1 2004-07-26 16:31:49 obarthel Exp $
+ *
+ * :ts=4
+ *
+ * Portable ISO 'C' (1994) runtime library for the Amiga computer
+ * Copyright (c) 2002-2004 by Olaf Barthel <olsen@sourcery.han.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   - Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *   - Neither the name of Olaf Barthel nor the names of contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _STDLIB_NULL_POINTER_CHECK_H
+#include "stdlib_null_pointer_check.h"
+#endif /* _STDLIB_NULL_POINTER_CHECK_H */
+
+/****************************************************************************/
+
+#ifndef _STDIO_HEADERS_H
+#include "stdio_headers.h"
+#endif /* _STDIO_HEADERS_H */
+
+/****************************************************************************/
+
+/* The following is not part of the ISO 'C' standard. */
+
+/****************************************************************************/
+
+int
+vsnprintf(char *buffer,size_t size,const char *format,va_list arg)
+{
+	struct iob string_iob;
+	int result = EOF;
+	char local_buffer[32];
+
+	ENTER();
+
+	SHOWPOINTER(buffer);
+	SHOWVALUE(size);
+	SHOWSTRING(format);
+	SHOWPOINTER(arg);
+
+	assert( format != NULL && arg != NULL && (int)size >= 0 );
+
+	#if defined(CHECK_FOR_NULL_POINTERS)
+	{
+		if(format == NULL || (buffer == NULL && size > 0))
+		{
+			SHOWMSG("invalid parameters");
+
+			errno = EFAULT;
+			goto out;
+		}
+	}
+	#endif /* CHECK_FOR_NULL_POINTERS */
+
+	if(__check_abort_enabled)
+		__check_abort();
+
+	__initialize_iob(&string_iob,(HOOKFUNC)__vsnprintf_hook_entry,
+		NULL,
+		local_buffer,sizeof(local_buffer),
+		-1,
+		-1,
+		IOBF_IN_USE | IOBF_WRITE | IOBF_NO_NUL | IOBF_BUFFER_MODE_NONE | IOBF_INTERNAL);
+
+	/* Store up to 'size-1' characters in the output buffer. This
+	   does not include the terminating NUL character, which we
+	   will add later. */
+	string_iob.iob_String		= (STRPTR)buffer;
+	string_iob.iob_StringSize	= (size > 0) ? (size - 1) : 0;
+
+	/* We will return the number of characters that would have been
+	   stored if there had been enough room. */
+	result = vfprintf((FILE *)&string_iob,format,arg);
+
+	/* Figure out how many characters were stored. Fewer than
+	   the output buffer size allows for may have been written
+	   to the buffer. The string needs to be terminated with a
+	   NUL byte behind the last character stored. */
+	if(size > 0)
+	{
+		assert( string_iob.iob_StringPosition >= 0 );
+		assert( string_iob.iob_StringPosition+1 <= size );
+
+		buffer[string_iob.iob_StringPosition] = '\0';
+
+		SHOWSTRING(buffer);
+	}
+	else
+	{
+		SHOWMSG("output buffer is empty");
+	}
+
+ out:
+
+	RETURN(result);
+	return(result);
+}