1 files changed, 120 insertions, 0 deletions
diff --git a/usr/src/lib/smbsrv/libsmb/common/smb_ctxbuf.c b/usr/src/lib/smbsrv/libsmb/common/smb_ctxbuf.c
new file mode 100644
index 0000000000..2b51f2b6af
--- /dev/null
+++ b/usr/src/lib/smbsrv/libsmb/common/smb_ctxbuf.c
@@ -0,0 +1,120 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*
+ * Buffer manipulation routines. These routines can be used to format
+ * data within a data buffer without worrying about overrunning the
+ * buffer.
+ *
+ * A ctxbuf_t structure is used to track the current location within
+ * the buffer. The ctxbuf_init() must be called first to initialize the
+ * context structure. ctxbuf_printf() can then be called to fill the buffer.
+ * ctxbuf_printf will discard any data that would overrun the buffer and
+ * the buffer will always be null terminated.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <smbsrv/libsmb.h>
+
+/*
+ * smb_ctxbuf_init
+ *
+ * Initialize the buffer context structure.
+ * This must be called before any of the other
+ * buffer routines can be used.
+ *
+ * Returns -1 if invalid parameters, 0 otherwise
+ */
+int
+smb_ctxbuf_init(smb_ctxbuf_t *ctx, unsigned char *buf, size_t buflen)
+{
+	if (ctx == 0 || buf == 0 || buflen == 0)
+		return (-1);
+
+	buf[0] = '\0';
+
+	ctx->basep = buf;
+	ctx->curp = buf;
+	ctx->endp = &buf[buflen];
+
+	return (0);
+}
+
+/*
+ * smb_ctxbuf_len
+ *
+ * Return the amount of data stored in the buffer,
+ * excluding the terminating null character. Similar
+ * to strlen()
+ *
+ * Returns 0 if the ctx is invalid.
+ */
+int
+smb_ctxbuf_len(smb_ctxbuf_t *ctx)
+{
+	if (ctx == 0 || ctx->basep == 0 ||
+	    ctx->curp == 0 || ctx->endp == 0)
+		return (0);
+	else
+		/*LINTED E_PTRDIFF_OVERFLOW*/
+		return (ctx->curp - ctx->basep);
+}
+
+/*
+ * smb_ctxbuf_printf
+ *
+ * Move formatted output (based on fmt string) to the buffer
+ * identified in ctxbuf.  Any output characters beyond the buffer
+ * are discarded and a null character is written at the end of the
+ * characters actually written.
+ *
+ * Returns
+ * Always return the number of bytes actually written (excluding the
+ * terminating null).
+ */
+int
+smb_ctxbuf_printf(smb_ctxbuf_t   *ctx, const char *fmt, ...)
+{
+	int n;
+	va_list args;
+
+	if (ctx == 0 || ctx->basep == 0 ||
+	    ctx->curp == 0 || ctx->endp == 0)
+		return (-1);
+
+	va_start(args, fmt);
+	/*LINTED E_PTRDIFF_OVERFLOW*/
+	n = vsnprintf((char *)ctx->curp, ctx->endp-ctx->curp, fmt, args);
+	ctx->curp += n;
+	va_end(args);
+
+	/*
+	 * return the number of bytes moved into the buffer.
+	 */
+	return (n);
+}