envos220.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 71 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
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****************************************************************************/


#include "standard.h"

extern  char            *_Envptr;
extern  char            *CopyStr( char *src, char *dst );
extern  uint            Length(char*);
extern  int             memicmp(char *,char *,uint);

char *EnvLook( char *name, char *p )
{
    int         name_len;
    int         env_len;

    name_len = Length( name );
    while( *p ) {
        env_len = Length( p );
        if( env_len > name_len ) {
            if( memicmp( name, p, name_len ) == 0 ) {
                if( p[ name_len ] == '=' ) {
                    return( p+name_len+1 );
                }
            }
        }
        p += env_len + 1;
    }
    return( NULL );             /* not found */
}

extern  bool    GetEnvVar( char *what, char *buff, int len ) {
/*************************************************************/

    char        *envvar;

    len = len;
    envvar = EnvLook( what, _Envptr );
    if( envvar == NULL ) return( FALSE );
    CopyStr( envvar, buff );
    return( TRUE );
}