Mercurial > hg > index.cgi
view docs/manual/x816.html @ 508:10f62dc61a75
Fix bad usage of sprintf()
Usage of sprintf() to append to a string in the form of
sprintf(buf, "%s...", buf...) is undefined, regardless whether it
worked on a lot of older systems. It was always a bad idea and it
now breaks on current glibc and gcc development environments.
The moral: if any of your code uses sprintf() in a way similar to
the above, fix it. It may not fail in a benign way.
author | William Astle <lost@l-w.ca> |
---|---|
date | Sun, 10 May 2020 22:38:24 -0600 |
parents | 52af0aa54fe5 |
children |
line wrap: on
line source
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Convenience Instructions</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="LW Tool Chain" HREF="index.html"><LINK REL="UP" TITLE="LWASM" HREF="c62.html"><LINK REL="PREVIOUS" TITLE="Assembler Modes and Pragmas" HREF="x670.html"><LINK REL="NEXT" TITLE="Cycle Counts" HREF="x821.html"></HEAD ><BODY CLASS="SECTION" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >LW Tool Chain</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="x670.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 3. LWASM</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="x821.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECTION" ><H1 CLASS="SECTION" ><A NAME="CONVINST" >3.11. Convenience Instructions</A ></H1 ><P > Similar to the 6800 compatibility instructions (pragma 6800compat) these pragma 6809conv and pragma 6309conv enable convenience extensions to the 6809 and 6309 instruction set. Originally intended for compatibility with the MACRO-80c assembler, these have proven useful in large codebases that target both the 6809 and the 6309.</P ><P > The 6809 extensions are straightforward with the exception of "TSTD" which assembles as "STD -2,S". A benefit of using these is they will "just work" and take on their 6309 equivalent when you enable 6309 assembly mode. Supported instructions: ASRD, CLRD, COMD, LSLD, LSRD, NEGD, TSTD.</P ><P > 6309 extensions are based on common patterns described by Chris Burke and Darren Atkinson in their 6309 documentation and include the following instructions: ASRQ, CLRQ, COMQ, LSLE, LSLF, LSLQ, LSRQ, NEGE, NEGF, NEGW, NEGQ, TSTQ.</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="x670.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="x821.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Assembler Modes and Pragmas</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="c62.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Cycle Counts</TD ></TR ></TABLE ></DIV ></BODY ></HTML >