source: downloads/boost_1_33_1/tools/build/jam_src/execvms.c @ 12

/* 
 * Copyright 1993, 1995 Christopher Seiwald.
 *
 * This file is part of Jam - see jam.c for Copyright information.
 */

# include "jam.h"
# include "lists.h"
# include "execcmd.h"

# ifdef OS_VMS

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <iodef.h>
#include <ssdef.h>
#include <descrip.h>
#include <dvidef.h>
#include <clidef.h>

/*
 * execvms.c - execute a shell script, ala VMS
 *
 * The approach is this:
 *
 *      If the command is a single line, and shorter than WRTLEN (what we 
 *      believe to be the maximum line length), we just system() it.
 *
 *      If the command is multi-line, or longer than WRTLEN, we write the 
 *      command block to a temp file, splitting long lines (using "-" at 
 *      the end of the line to indicate contiuation), and then source that 
 *      temp file.  We use special logic to make sure we don't continue in
 *      the middle of a quoted string.
 *
 * 05/04/94 (seiwald) - async multiprocess interface; noop on VMS
 * 12/20/96 (seiwald) - rewritten to handle multi-line commands well
 * 01/14/96 (seiwald) - don't put -'s between "'s
 */

#define WRTLEN 240

#define MIN( a, b )     ((a) < (b) ? (a) : (b))

/* 1 for the @ and 4 for the .com */

char tempnambuf[ L_tmpnam + 1 + 4 ] = {0};

void
execcmd( 
        char *string,
        void (*func)( void *closure, int status ),
        void *closure,
        LIST *shell )
{
        char *s, *e, *p;
        int rstat = EXEC_CMD_OK;
        int status;

        /* See if string is more than one line */
        /* discounting leading/trailing white space */

        for( s = string; *s && isspace( *s ); s++ )
                ;

        e = p = strchr( s, '\n' );

        while( p && isspace( *p ) )
                ++p;

        /* If multi line or long, write to com file. */
        /* Otherwise, exec directly. */

        if( p && *p || e - s > WRTLEN )
        {
            FILE *f;

            /* Create temp file invocation "@sys$scratch:tempfile.com" */

            if( !*tempnambuf )
            {
                tempnambuf[0] = '@';
                (void)tmpnam( tempnambuf + 1 );
                strcat( tempnambuf, ".com" );
            }
            
            /* Open tempfile */

            if( !( f = fopen( tempnambuf + 1, "w" ) ) )
            {
                printf( "can't open command file\n" );
                (*func)( closure, EXEC_CMD_FAIL );
                return;
            }

            /* For each line of the string */

            while( *string )
            {
                char *s = strchr( string, '\n' );
                int len = s ? s + 1 - string : strlen( string );

                fputc( '$', f );

                /* For each chunk of a line that needs to be split */

                while( len > 0 )
                {
                    char *q = string;
                    char *qe = string + MIN( len, WRTLEN );
                    char *qq = q;
                    int quote = 0;

                    /* Look for matching "'s */

                    for( ; q < qe; q++ )
                        if( *q == '"' && ( quote = !quote ) )
                            qq = q;

                    /* Back up to opening quote, if in one */

                    if( quote )
                        q = qq;

                    fwrite( string, ( q - string ), 1, f );

                    len -= ( q - string );
                    string = q;

                    if( len )
                    {
                        fputc( '-', f );
                        fputc( '\n', f );
                    }
                }
            }

            fclose( f );

            status = system( tempnambuf ) & 0x07;

            unlink( tempnambuf + 1 );
        }
        else
        {
            /* Execute single line command */
            /* Strip trailing newline before execing */
            if( e ) *e = 0;
            status = system( s ) & 0x07;
        }

        /* Fail for error or fatal error */
        /* OK on OK, warning, or info exit */

        if( status == 2 || status == 4 )
            rstat = EXEC_CMD_FAIL;

        (*func)( closure, rstat );
}

int 
execwait()
{
        return 0;
}

# endif /* VMS */