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─────Run-Time Library───────────────────────────────────────────────────────
 
/* ENVIRON.C illustrates environment variable functions including:
 *      getenv          _putenv          _searchenv
 */
 
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
 
void main( void )
{
    char *pathvar, pathbuf[256], filebuf[256];
 
    /* Get the PATH environment variable and save a copy of it. */
    pathvar = getenv( "PATH" );
    strcpy( pathbuf, pathvar );
    printf( "Old PATH: %s\n", pathvar ? pathvar : "variable not set");
 
    /* Add a new directory to the path. */
    strcpy( pathbuf, "PATH=" );
    strcat( pathbuf, pathvar );
    strcat( pathbuf, ";\\C700\\INIT;" );
    if( _putenv( pathbuf ) == -1 )
    {
        printf( "Failed\n");
        exit( 1 );
    }
    else
        printf( "New PATH: %s\n", pathbuf );
 
    /* Search for file in the new path. */
    _searchenv( "TOOLS.INI", "PATH", filebuf );
    if( *filebuf )
        printf( "TOOLS.INI found at %s\n", filebuf );
    else
        printf( "TOOLS.INI not found\n" );
 
    /* Restore original path. */
    strcpy( pathbuf, "PATH=" );
    strcat( pathbuf, pathvar );
    if( _putenv( pathbuf ) == -1 )
        printf( "Failed\n");
    else
        printf( "Old PATH: %s\n", pathvar );
    exit( 0 );
}
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