Beginning of work on 16951, not part of build yet

xpcom/ds/nsTextFormatter.h

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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.1 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ * 
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ * 
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+#ifndef nsTextFormatter_h___
+#define nsTextFormatter_h___
+
+/*
+** API for PR printf like routines. Supports the following formats
+**	%d - decimal
+**	%u - unsigned decimal
+**	%x - unsigned hex
+**	%X - unsigned uppercase hex
+**	%o - unsigned octal
+**	%hd, %hu, %hx, %hX, %ho - 16-bit versions of above
+**	%ld, %lu, %lx, %lX, %lo - 32-bit versions of above
+**	%lld, %llu, %llx, %llX, %llo - 64 bit versions of above
+**	%s - utf8 string
+**	%S - PRUnichar string
+**	%c - character
+**	%p - pointer (deals with machine dependent pointer size)
+**	%f - float
+**	%g - float
+*/
+#include "prtypes.h"
+#include "prio.h"
+#include <stdio.h>
+#include <stdarg.h>
+#include "nscore.h"
+
+
+class NS_COM nsTextFormatter {
+
+public:
+
+/*
+** sprintf into a fixed size buffer. Guarantees that a NUL is at the end
+** of the buffer. Returns the length of the written output, NOT including
+** the NUL, or (PRUint32)-1 if an error occurs.
+*/
+static PRUint32  snprintf(PRUnichar *out, PRUint32 outlen, const PRUnichar *fmt, ...);
+
+/*
+** sprintf into a PR_MALLOC'd buffer. Return a pointer to the malloc'd
+** buffer on success, NULL on failure. Call "smprintf_free" to release
+** the memory returned.
+*/
+static PRUnichar*  smprintf(const PRUnichar *fmt, ...);
+
+/*
+** Free the memory allocated, for the caller, by smprintf
+*/
+static void smprintf_free(PRUnichar *mem);
+
+/*
+** "append" sprintf into a PR_MALLOC'd buffer. "last" is the last value of
+** the PR_MALLOC'd buffer. sprintf will append data to the end of last,
+** growing it as necessary using realloc. If last is NULL, PR_sprintf_append
+** will allocate the initial string. The return value is the new value of
+** last for subsequent calls, or NULL if there is a malloc failure.
+*/
+static PRUnichar*  sprintf_append(PRUnichar *last, const PRUnichar *fmt, ...);
+
+/*
+** va_list forms of the above.
+*/
+static PRUint32  vsnprintf(PRUnichar *out, PRUint32 outlen, const PRUnichar *fmt, va_list ap);
+static PRUnichar*  vsmprintf(const PRUnichar *fmt, va_list ap);
+static PRUnichar*  vsprintf_append(PRUnichar *last, const PRUnichar *fmt, va_list ap);
+
+#ifdef DEBUG
+static PRBool SelfTest();
+#endif
+
+
+};
+
+#endif /* nsTextFormatter_h___ */