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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML><HEAD> <META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.20"> <TITLE>cc65 function reference: Alphabetical function reference: getenv</TITLE> <LINK HREF="funcref-98.html" REL=next> <LINK HREF="funcref-96.html" REL=previous> <LINK HREF="funcref.html#toc3" REL=contents></HEAD><BODY><A HREF="funcref-98.html">Next</A><A HREF="funcref-96.html">Previous</A><A HREF="funcref.html#toc3">Contents</A><HR><H2><A NAME="getenv"></A> 3.56 <A HREF="funcref.html#toc3.56">getenv</A></H2><P><BLOCKQUOTE><DL><DT><B>Function</B><DD><P>Return a value from the environment.</P><DT><B>Header</B><DD><P><CODE><A HREF="funcref-34.html#stdlib.h">stdlib.h</A></CODE></P><DT><B>Declaration</B><DD><P><CODE>char* __fastcall__ getenv (const char* name);</CODE></P><DT><B>Description</B><DD><P>The function searches the environment for an entry thatmatches <CODE>name</CODE> and returns its value. The environment consists of a listof strings in the form <CODE>name=value</CODE>. If there is no match, <CODE>getenv</CODE>returns <CODE>NULL</CODE>.</P><DT><B>Limits</B><DD><P><UL><LI>What exactly is stored in the environment depends on the machine theprogram is running on.</LI><LI>The function is only available as fastcall function, so it may onlybe used in presence of a prototype.</LI></UL></P><DT><B>Availability</B><DD><P>ISO 9899</P><DT><B>Example</B><DD><P>None.</P></DL></BLOCKQUOTE></P><HR><A HREF="funcref-98.html">Next</A><A HREF="funcref-96.html">Previous</A><A HREF="funcref.html#toc3">Contents</A></BODY></HTML>⌨️ 快捷键说明
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