Usenet 1994 January/usenetsourcesnewsgroupsinfomagicjanuary1994.iso/sources/unix/volume25/trn/part02/artio.c

C/C++ Source or Header | 1991-12-02 | 5.0 KB | 188 lines

/* $Id: artio.c,v 4.4 1991/09/09 20:18:23 sob Exp sob $
 *
 * $Log: artio.c,v $
 * Revision 4.4  1991/09/09  20:18:23  sob
 * release 4.4
 *
 *
 *
 */
/* This software is Copyright 1991 by Stan Barber.
 *
 * Permission is hereby granted to copy, reproduce, redistribute or otherwise
 * use this software as long as: there is no monetary profit gained
 * specifically from the use or reproduction of this software, it is not
 * sold, rented, traded or otherwise marketed, and this copyright notice is
 * included prominently in any copy made.
 *
 * The author make no claims as to the fitness or correctness of this software
 * for any use whatsoever, and it is provided as is. Any use of this software
 * is at the user's own risk.
 */

#include "EXTERN.h"
#include "common.h"
#ifdef SERVER
#include "server.h"
#endif
#include "INTERN.h"
#include "artio.h"

void
artio_init()
{
    ;
}

/* open an article, unless it's already open */

FILE *
artopen(artnum)
ART_NUM artnum;
{
#ifdef SERVER
    return nntpopen(artnum,GET_ARTICLE);
#else
    char artname[MAXFILENAME];        /* filename of current article */

    if (artnum < 1)
    return Nullfp;
    if (openart == artnum) {        /* this article is already open? */
    fseek(artfp,0L,0);        /* just get to the beginning */
    return artfp;            /* and say we succeeded */
    }
    if (artfp != Nullfp) {        /* it was somebody else? */
    fclose(artfp);            /* put them out of their misery */
    openart = 0;            /* and remember them no more */
    }
    sprintf(artname,"%ld",(long)artnum);
                    /* produce the name of the article */
    if (artfp = fopen(artname,"r"))    /* if we can open it */
    openart = artnum;        /* remember what we did here */
#ifdef LINKART
    {
    char tmpbuf[256];
    char *s;

    if (fstat(fileno(artfp),&filestat))
        return artfp;
    if (filestat.st_size < (sizeof tmpbuf)) {
        fgets(tmpbuf,(sizeof tmpbuf),artfp);
        if (*tmpbuf == '/') {    /* is a "link" to another article */
        fclose(artfp);
        if (s=index(tmpbuf,'\n'))
            *s = '\0';
        if (!(artfp = fopen(tmpbuf,"r")))
            openart = 0;
        else {
            if (*linkartname)
            free(linkartname);
            linkartname = savestr(tmpbuf);
        }
        }
        else
        fseek(artfp,0L,0);        /* get back to the beginning */
    }
    }
#endif
    return artfp;            /* and return either fp or NULL */
#endif /* SERVER */
}

#ifdef SERVER
static long our_pid=0;

FILE *
nntpopen(artnum,function)
ART_NUM artnum;
ART_PART function;
{
    char artname[MAXFILENAME];        /* filename of current article */
    char intrpwork[MAXFILENAME];    /* filename of current article */
    if (our_pid == 0)
    our_pid = getpid();
    if (artnum < 1)
    return Nullfp;
    if ((openart == artnum) && (openpart >= function))
    {                    /* this article is already open? */
    fseek(artfp,0L,0);        /* just get to the beginning */
    return artfp;            /* and say we succeeded */
    }
    if (artfp != Nullfp) {        /* it was somebody else? */
    fclose(artfp);            /* put them out of their misery */
    nntpclose();
    openart = 0;            /* and remember them no more */
    }
    interp(intrpwork,MAXFILENAME-1,"%P");
    sprintf(artname,"%s/rrn%ld.%ld", intrpwork,(long) artnum, our_pid);
    artfp = fopen(artname, "w+");    /* create the temporary article */
    if (artfp == Nullfp) {
    UNLINK(artname);
    return Nullfp;
    }
    switch (function){
        case GET_STATUS:
        function = GET_HEADER;    /* fall through */
        case GET_HEADER:
        sprintf(ser_line, "HEAD %ld", (long)artnum);
        break;
        case GET_ARTICLE:
        sprintf(ser_line, "ARTICLE %ld", (long)artnum);
        break;
    }
#ifdef DEBUGGING
    if (debug & DEB_NNTP)
    printf(">%s\n", ser_line) FLUSH;
#endif
    put_server(ser_line);        /* ask the server for the article */
    if (nntp_get(ser_line, sizeof(ser_line)) < 0) {
    fprintf(stderr, "\nrrn: Unexpected close of server socket.\n");
    finalize(1);
    }
#ifdef DEBUGGING
    if (debug & DEB_NNTP)
    printf("<%s\n", ser_line) FLUSH;
#endif
    if (*ser_line == CHAR_FATAL) {    /* Fatal error */
        fprintf(stderr,"\nrrn: %s\n",ser_line);
        finalize(1);
    }
    if (*ser_line != CHAR_OK) {        /* and get it's reaction */
    fclose(artfp);
    artfp = Nullfp;
    UNLINK(artname);
     errno = ENOENT;        /* Simulate file-not-found */
        return Nullfp;
    }

    for (;;) {
        if (nntp_get(ser_line, sizeof(ser_line)) < 0) {
        fprintf(stderr, "\nrrn: Unexpected close of server socket.\n");
        finalize(1);
    }
    if (ser_line[0] == '.' && ser_line[1] == '\0')
        break;
    fputs((ser_line[0] == '.' ? ser_line + 1 : ser_line), artfp);
    putc('\n', artfp);
    }
    openpart = function;
    if (function == GET_HEADER)
     putc('\n', artfp); /* req'd blank line after header */
    fseek(artfp, 0L, 0);        /* Then get back to the start */
    openart = artnum;
    return artfp;            /* and return either fp or NULL */
}

void
nntpclose()
{
    char artname[MAXFILENAME];        /* filename of current article */
    char intrpwork[MAXFILENAME];    /* filename of current article */
    if (our_pid == 0)
    our_pid = getpid();
    interp(intrpwork,MAXFILENAME-1,"%P");
    sprintf(artname, "%s/rrn%ld.%ld", intrpwork,(long) openart, our_pid);
    UNLINK(artname);
}
#endif