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<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifdef X400
set_which_mts(msg_fp)
FILE	*msg_fp;
{
    register int  state;
    register char tmpbuf[BUFSIZ];
    char          name[NAMESZ];
    extern char   need_x400_me;

    for (state = FLD;state == FLD || state == FLDPLUS;) {
	state = m_getfld (state, name, tmpbuf, BUFSIZ, msg_fp);
	switch (state) {
	    case FLD: 
	    case FLDPLUS: 
fprintf(stderr,"name = '%s', tmpbuf = '%s'\n",name,tmpbuf);
		if (uleq(name, "X-mts"))
		    if (uleq(tmpbuf, "x400"))
			need_x400_me = 1;
		while (state == FLDPLUS)
		    state = m_getfld (state, name, tmpbuf, BUFSIZ, msg_fp);
		break;

	    case LENERR: 
	    case FMTERR: 
	    case BODY: 
	    case FILEEOF:
		break;

	    default: 
		adios (NULLCP, "m_getfld() returned %d", state);
	}
    }
    rewind(msg_fp);
fprintf(stderr,"need_x400_me = %d\n",need_x400_me);
}

char *
get_x400_orname()
{
int		pid, fid, len;
char		*tfile, *ambx;
char		*ptr = NULL;
struct stat	sbuf;

/* Replace stdout with a temporary file to grab the x400_whois output... */
    close(1);
    tfile = m_tmpfil("x400repl");
/* This 'open' replaces the closed stdout... */
    if (open(tfile, O_WRONLY|O_CREAT, 0600) < 0) {
	fprintf(stderr,"Can't open temporary file for writing to...\n");
	return((char *)NULL);
    }

    pid = fork();
    if (pid == -1)
	return((char *)NULL);

    if (pid > 0) {	/* Parent process. */
	if (wait(NULL) != pid)
	    fprintf(stderr,"Wait returned without pid\n");
    }
    else {		/* Child process. */
	execl("/usr/bin/x400_whois", "x400_whois", (char *)NULL);
	execlp("x400_whois", "x400_whois", (char *)NULL);
	fprintf(stderr,"Can't find 'x400_whois'...\n");
	exit(1);
    }

/* Back to the main repl invocation again... */

/* Replace the tempfile stdout with the stderr. */
    close(1);
    dup(2);

    if (stat(tfile, &sbuf) < 0)
	fprintf(stderr,"Can't stat the temp file...\n");
    else {
	if (sbuf.st_size <= 0)
	    fprintf(stderr,"No X.400 address...\n");
	else {
	    ptr = malloc((unsigned)sbuf.st_size + 2);

	    fid = open(tfile, O_RDONLY);
	    if (fid < 0)
	        fprintf(stderr,"Failed to open tempfile for reading from.\n");
	    else {
	        len = read(fid, ptr, sbuf.st_size);

/* If the output of x400_whois does not begin with a '/' then it is not an
 * ORaddress...
 */
		if (*ptr == '/') {

/* Terminate the string, and delete any trailing newline... */
		    ptr[sbuf.st_size] = '\0';
		    if (sbuf.st_size > 0 && ptr[sbuf.st_size - 1] == '\n')
			ptr[sbuf.st_size - 1] = '\0';

		    if (len != sbuf.st_size) {
			fprintf(stderr,"Read %d instead of %d\n",len,sbuf.st_size);
			ptr = (char *)NULL;
		    }
#ifdef NOTDEF
/* PJS: Can't m_replcae the alternate-mailboxes entry, as it usually resides
 * in the mh_profile rather than the context: those entries in the profile
 * are not changeable in program code...
 */
		    else {
			ambx = m_find("Alternate-mailboxes");
			if (ambx != (char *)NULL) {
			    ptr = realloc(ptr,(unsigned)sbuf.st_size+strlen(ambx)+4);
			    strcat(ptr, ",");
			    strcat(ptr, ambx);
			}
			m_replace("Alternate-mailboxes",ptr);
		    }
#endif NOTDEF
		}
	        close(fid);
	    }
	}
    }
    unlink(tfile);
fprintf(stderr,"get_x400_orname() -> '%s'\n",(ptr==(char *)NULL)?"NULL":ptr);
    return(ptr);
}
#endif X400