File: NewsRC.cc

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/*
NewsRC.cc

Modifications of Mark Crispin original
*/

/*
 * Program:     Newsrc manipulation routines
 *
 * Author:      Mark Crispin
 *              Networks and Distributed Computing
 *              Computing & Communications
 *              University of Washington
 *              Administration Building, AG-44
 *              Seattle, WA  98195
 *              Internet: MRC@CAC.Washington.EDU
 *
 * Date:        12 September 1994
 * Last Edited: 11 April 2001
 * 
 * The IMAP toolkit provided in this Distribution is
 * Copyright 2001 University of Washington.
 * The full text of our legal notices is contained in the file called
 * CPYRIGHT, included with this Distribution.
 */


#include "NewsRC.h"

#ifndef OLDFILESUFFIX
#define OLDFILESUFFIX ".old"
#endif

/* Error message
 * Accepts: message format
 *          additional message string
 *          message level
 * Returns: NIL, always
 */

long Newsrc_error (char *fmt,char *text,long errflg)
{
  char tmp[MAILTMPLEN];
  sprintf (tmp,fmt,text);
  MM_LOG (tmp,errflg);
  return NIL;
}


/* Write error message
 * Accepts: newsrc name
 *          file designator
 *          file designator
 * Returns: NIL, always
 */

long Newsrc_write_error (char *name, FILE *f1,FILE *f2)
{
  fclose (f1);                  /* close file designators */
  fclose (f2);
  return Newsrc_error ("Error writing to %.80s",name,ERROR);
}


/* Create newsrc file in local form
 * Accepts: MAIL stream
 *          notification flag
 * Returns: file designator of newsrc
 */

FILE *Newsrc_create (MAILSTREAM *stream,int notify)
{
  char *newsrc = (char *) mail_parameters (stream,GET_NEWSRC,stream);
  FILE *f = fopen (newsrc,"wb");
  if (!f) Newsrc_error ("Unable to create news state %.80s",newsrc,ERROR);
  else if (notify) Newsrc_error ("Creating news state %.80s",newsrc,WARN);
  return f;
}

/* Write new state in newsrc
 * Accepts: file designator of newsrc
 *          group
 *          new subscription status character
 *          newline convention
 * Returns: T if successful, NIL otherwise
 */

long Newsrc_newstate (FILE *f,char *group,char state,char *nl)
{
  return (f && (fputs (group,f) != EOF) && ((putc (state,f)) != EOF) &&
          ((putc (' ',f)) != EOF) && (fputs (nl,f) != EOF) &&
          (fclose (f) != EOF)) ? LONGT : NIL;
}


/* Write messages in newsrc
 * Accepts: file designator of newsrc
 *          MAIL stream
 *          message number/newsgroup message map
 *          newline convention
 * Returns: T if successful, NIL otherwise
 */

long Newsrc_newmessages (FILE *f, MAILSTREAM *stream, char *nl)
  {
  unsigned long i,j,k;
  char tmp[MAILTMPLEN];
  MESSAGECACHE *elt;
  int c = ' ';
  if (stream->nmsgs) 
    {          /* have any messages? */
    for (i = 1,j = k = (mail_elt (stream,i)->cclientPrivate.uid > 1) ? 1 : 0; i <= stream->nmsgs; ++i) 
     {
     /*CAMBIOS: Chequeo el flag de SEEN. EL original lo hacia con DELETE*/
      elt = mail_elt (stream,i);
      if (elt->seen)
        {
        k = elt->cclientPrivate.uid;   /* this is the top of the current range */
        if (!j) j = k;          /* if no range in progress, start one */
        }
      else if (j) 
        {             /* unread message, ending a range */
                                /* calculate end of range */
        if ((k = elt->cclientPrivate.uid - 1) != 0) 
          {
                                /* dump range */
          sprintf (tmp,(j == k) ? "%c%ld" : "%c%ld-%ld",c,j,k);
          if (fputs (tmp,f) == EOF) return NIL;
          c = ',';              /* need a comma after the first time */
          }
        j = 0;                  /* no more range in progress */
        }
      }
    if (j) 
      {                    /* dump trailing range */
      sprintf (tmp,(j == k) ? "%c%ld" : "%c%ld-%ld",c,j,k);
      if (fputs (tmp,f) == EOF) return NIL;
      }
    }                                /* write trailing newline, return */
  return (fputs (nl,f) == EOF) ? NIL : LONGT;
  }

/* List subscribed newsgroups
 * Accepts: MAIL stream
 *          prefix to append name
 *          pattern to search
 */

void Newsrc_lsub (MAILSTREAM *stream,char *pattern)
{
  char *s,*t,*lcl,name[MAILTMPLEN];
  int c = ' ';
  int showuppers = pattern[strlen (pattern) - 1] == '%';
  FILE *f = fopen ((char *) mail_parameters (stream,GET_NEWSRC,stream),"rb");
  if (f) {                      /* got file? */
                                /* remote name? */
    if (*(lcl = xstrncpy (name,MAILTMPLEN,pattern)) == '{') lcl = strchr (lcl,'}') + 1;
    if (*lcl == '#') lcl += 6;  /* namespace format name? */
    while (c != EOF) {          /* yes, read newsrc */
      for (s = lcl; (s < (name + MAILTMPLEN - 1)) && ((c = getc (f)) != EOF) &&
           (c != ':') && (c != '!') && (c != '\015') && (c != '\012');
           *s++ = c);
      if (c == ':') {           /* found a subscribed newsgroup? */
        *s = '\0';              /* yes, tie off name */
                                /* report if match */
        if (pmatch_full (name,pattern,'.')) mm_lsub (stream,'.',name,NIL);
        else while (showuppers && (t = strrchr (lcl,'.'))) {
          *t = '\0';            /* tie off the name */
          if (pmatch_full (name,pattern,'.'))
            mm_lsub (stream,'.',name,LATT_NOSELECT);
        }
      }
      while ((c != '\015') && (c != '\012') && (c != EOF)) c = getc (f);
    }
    fclose (f);
  }
}

/* Update subscription status of newsrc
 * Accepts: MAIL stream
 *          group
 *          new subscription status character
 * Returns: T if successful, NIL otherwise
 */

long Newsrc_update (MAILSTREAM *stream,char *group,char state)
{
  char tmp[MAILTMPLEN];
  char *newsrc = (char *) mail_parameters (stream,GET_NEWSRC,stream);
  long ret = NIL;
  FILE *f = fopen (newsrc,"r+b");
  if (f) {                      /* update existing file */
    int c = 0;
    char *s,nl[3];
    long pos = 0;
    nl[0] = nl[1] = nl[2]='\0'; /* no newline known yet */
    do {                        /* read newsrc */
      for (s = tmp; (s < (tmp + MAILTMPLEN - 1)) && ((c = getc (f)) != EOF) &&
           (c != ':') && (c != '!') && (c != '\015') && (c != '\012');
           *s++ = c) pos = ftell (f);
      *s = '\0';                /* tie off name */
                                /* found the newsgroup? */
      if (((c == ':') || (c == '!')) && !strcmp (tmp,group)) {
        if (c == state) {       /* already at that state? */
          if (c == ':') Newsrc_error("Already subscribed to %.80s",group,WARN);
          ret = LONGT;          /* noop the update */
        }
                                /* write the character */
        else if (!fseek (f,pos,0)) ret = ((putc (state,f)) == EOF) ? NIL:LONGT;
        if (fclose (f) == EOF) ret = NIL;
        f = NIL;                /* done with file */
        break;
      }
                                /* gobble remainder of this line */
      while ((c != '\015') && (c != '\012') && (c != EOF)) c = getc (f);
                                /* need to know about newlines and found it? */
      if (!nl[0] && ((c == '\015') || (c == '\012')) && ((nl[0]=c) == '\015')){
                                /* sniff and see if an LF */
        if ((c = getc (f)) == '\012') nl[1] = c;
        else ungetc (c,f);      /* nope, push it back */
      }
    } while (c != EOF);

    if (f) {                    /* still haven't written it yet? */
      if (nl[0]) {              /* know its newline convention? */
        fseek (f,0L,2);         /* yes, seek to end of file */
        ret = Newsrc_newstate (f,group,state,nl);
      }
      else {                    /* can't find a newline convention */
        fclose (f);             /* punt the file */
                                /* can't win if read something */
        if (pos) Newsrc_error ("Unknown newline convention in %.80s", newsrc,ERROR);
                                /* file must have been empty, rewrite it */
        else ret = Newsrc_newstate(Newsrc_create(stream,NIL),group,state,"\n");
      }
    }
  }
                                /* create new file */
  else ret = Newsrc_newstate (Newsrc_create (stream,T),group,state,"\n");
  return ret;                   /* return with update status */
}

/* Update newsgroup status in stream
 * Accepts: newsgroup name
 *          MAIL stream
 * Returns: number of recent messages
 */

long Newsrc_read (char *group,MAILSTREAM *stream)
{
  int c = 0;
  char *s,tmp[MAILTMPLEN];
  unsigned long i,j;
  MESSAGECACHE *elt;
  unsigned long m = 1,recent = 0,unseen = 0;
  FILE *f = fopen ((char *) mail_parameters (stream,GET_NEWSRC,stream),"rb");
  if (f) 
  do 
    {                   /* read newsrc */
    for (s = tmp; (s < (tmp + MAILTMPLEN - 1)) && ((c = getc (f)) != EOF) &&
         (c != ':') && (c != '!') && (c != '\015') && (c != '\012'); *s++ = c);
    *s = '\0';                  /* tie off name */
    if ((c==':') || (c=='!')) 
      { /* found newsgroup? */
      if (strcmp (tmp,group))   /* group name match? */
        while ((c != '\015') && (c != '\012') && (c != EOF)) c = getc (f);
      else 
        {                    /* yes, skip leading whitespace */
        while ((c = getc (f)) == ' ');
                                /* only if unprocessed messages */
        if (stream->nmsgs) 
        while (f && (m <= stream->nmsgs)) 
          {
                                /* collect a number */
          if (isdigit (c)) 
            {    /* better have a number */
            for (i = 0,j = 0; isdigit (c); c = getc (f)) i = i*10 + (c-'0');
            if (c == '-') for (c = getc (f); isdigit (c); c = getc (f))
              j = j*10 +(c-'0');/* collect second value if range */
            if (!unseen && (mail_elt (stream,m)->cclientPrivate.uid < i)) unseen = m;
                                /* skip messages before first value */
            while ((m <= stream->nmsgs) &&
                   ((elt = mail_elt (stream,m))->cclientPrivate.uid < i) && m++)
              elt->valid = T;
                                /* do all messages in range */
            while ((m <= stream->nmsgs) && (elt = mail_elt (stream,m)) &&
                   (j ? ((elt->cclientPrivate.uid >= i) && (elt->cclientPrivate.uid <= j)) :
                    (elt->cclientPrivate.uid == i)) && m++)
              {      
              /*CAMBIOS: ME BASO EN EL FLAG DE SEEN. PONGO EL DE DELETED A CERO*/
              elt->deleted = 0;
              elt->valid = elt->seen = T;
              }
            }

          switch (c) 
            {          /* what is the delimiter? */
            case ',':             /* more to come */
              c = getc (f);       /* get first character of number */
              break;
            default:              /* bogus character */
              sprintf (tmp,"Bogus character 0x%x in news state",(unsigned int)c);
              MM_LOG (tmp,ERROR);
            case EOF: case '\015': case '\012':
              fclose (f);         /* all done - close the file */
              f = NIL;
              break;
            }
          }
        else 
          {                  /* empty newsgroup */
          while ((c != '\015') && (c != '\012') && (c != EOF)) c = getc (f);
          fclose (f);           /* all done - close the file */
          f = NIL;
          }
        }
      }
    } 
  while (f && (c != EOF));    /* until file closed or EOF */
  if (f) 
    {                      /* still have file open? */
    //*** sprintf (tmp,"No state for newsgroup %.80s found, reading as new",group);
    //*** MM_LOG (tmp,WARN);
    fclose (f);                 /* close the file */
    }
  if (m <= stream->nmsgs) 
    {     /* any messages beyond newsrc range? */
    if (!unseen) unseen = m;    /* then this must be the first unseen one */
    do 
      {
      elt = mail_elt (stream,m++);
      elt->valid = elt->recent = T;
      ++recent;                 /* count another recent message */
      } 
    while (m <= stream->nmsgs);
    }
  if (unseen) 
    {                 /* report first unseen message */
    sprintf (tmp,"[UNSEEN] %lu is first unseen message in %.80s",unseen,group);
    MM_NOTIFY (stream,tmp,(long) NIL);
    }
  return recent;
  }

/* Update newsgroup entry in newsrc
 * Accepts: newsgroup name
 *          MAIL stream
 * Returns: T if successful, NIL otherwise
 */

long Newsrc_write (const char *group, MAILSTREAM *stream)
  {
  int c = 0,d = EOF;
  char *newsrc = (char *) mail_parameters (stream, GET_NEWSRC, stream);
  char *s,tmp[MAILTMPLEN],backup[MAILTMPLEN],nl[3];
  FILE *f,*bf;
  nl[0] = nl[1] = nl[2] = '\0'; /* no newline known yet */
  if ((f = fopen (newsrc,"rb")) != NULL) 
    {    
    /* have existing newsrc file? */
    xstrncpy (backup, MAILTMPLEN, newsrc);
    xstrncat (backup, MAILTMPLEN, OLDFILESUFFIX);
    if (!(bf = fopen (backup, "wb")))
      {
      fclose (f);               /* punt input file */
      return Newsrc_error("Can't create backup news state %.80s",backup,ERROR);
      }
                                /* copy to backup file */
    while ((c = getc (f)) != EOF) 
      {
                                /* need to know about newlines and found it? */
      if (!nl[0] && ((c == '\015') || (c == '\012')) && ((nl[0]=c) == '\015'))
        {
                                /* sniff and see if an LF */
        if ((c = getc (f)) == '\012') nl[1] = c;
        ungetc (c,f);           /* push it back */
        }
                                /* write to backup file */
      if ((d = putc (c,bf)) == EOF) 
        {
        fclose (f);             /* punt input file */
        return Newsrc_error ("Error writing backup news state %.80s", newsrc,ERROR);
        }
      }
    fclose (f);                 /* close existing file */
    if (fclose (bf) == EOF)     /* and backup file */
      return Newsrc_error ("Error closing backup news state %.80s", newsrc,ERROR);
    if (d == EOF) 
      {             /* open for write if empty file */
      if ((f = Newsrc_create (stream, NIL)) != NULL) bf = NIL;
      else return NIL;
      }
    else if (!nl[0])            /* make sure newlines valid */
      return Newsrc_error ("Unknown newline convention in %.80s",newsrc,ERROR);
                                /* now read backup file */
    else if (!(bf = fopen (backup,"rb")))
      return Newsrc_error ("Error reading backup news state %.80s", backup,ERROR);
                                /* open newsrc for writing */
    else if (!(f = fopen (newsrc,"wb"))) 
      {
      fclose (bf);              /* punt backup */
      return Newsrc_error ("Can't rewrite news state %.80s", newsrc,ERROR);
      }
    }
  else 
    {                        /* create new newsrc file */
    if ((f = Newsrc_create (stream, T)) != NULL) bf = NIL;
    else return NIL;            /* can't create newsrc */
    }
  
  while (bf) 
    {                  /* read newsrc */
    for (s = tmp; (s < (tmp + MAILTMPLEN - 1)) && ((c = getc (bf)) != EOF) &&
         (c != ':') && (c != '!') && (c != '\015') && (c != '\012'); *s++ = c);
    *s = '\0';                  /* tie off name */
                                /* saw correct end of group delimiter? */
    if (tmp[0] && ((c == ':') || (c == '!'))) 
      {
                                /* yes, write newsgroup name and delimiter */
      if ((tmp[0] && (fputs (tmp,f) == EOF)) || ((putc (c,f)) == EOF))
        return Newsrc_write_error (newsrc,bf,f);
      if (!strcmp (tmp,group)) 
        {/* found correct group? */
                                /* yes, write new status */
        if (!Newsrc_newmessages (f, stream,nl[0] ? nl : (char *)"\n"))
          return Newsrc_write_error (newsrc,bf,f);
                                /* skip past old data */
        while (((c = getc (bf)) != EOF) && (c != '\015') && (c != '\012'));
                                /* skip past newline */
        while ((c == '\015') || (c == '\012')) c = getc (bf);
        while (c != EOF) 
          {      /* copy remainder of file */
          if (putc (c,f) == EOF) return Newsrc_write_error (newsrc,bf,f);
          c = getc (bf);        /* get next character */
          }
                                /* done with file */
        if (fclose (f) == EOF) return Newsrc_write_error (newsrc,bf,f);
        f = NIL;
        }
                                /* copy remainder of line */
      else while (((c = getc (bf)) != EOF) && (c != '\015') && (c != '\012'))
        if (putc (c,f) == EOF) return Newsrc_write_error (newsrc,bf,f);
      if (c == '\015') 
        {        /* write CR if seen */
        if (putc (c,f) == EOF) return Newsrc_write_error (newsrc,bf,f);
                                /* sniff to see if LF */
        if (((c = getc (bf)) != EOF) && (c != '\012')) ungetc (c,bf);
        }
                                /* write LF if seen */
      if ((c == '\012') && (putc (c,f) == EOF)) return Newsrc_write_error (newsrc,bf,f);
      }
    if (c == EOF) 
      {             /* hit end of file? */
      fclose (bf);              /* yup, close the file */
      bf = NIL;
      }
    }
  if (f) 
    {                      /* still have newsrc file open? */
    if ((fputs (group,f) == EOF) || ((putc (':',f)) == EOF) ||
        (!Newsrc_newmessages (f,stream,nl[0] ? nl : (char *)"\n")) ||
        (fclose (f) == EOF)) return Newsrc_write_error (newsrc,bf,f);
    }
  return LONGT;
  }

/* Get newsgroup state as text stream
 * Accepts: MAIL stream
 *          newsgroup name
 * Returns: string containing newsgroup state, or NIL if not found
 */

char *Newsrc_state (MAILSTREAM *stream,char *group)
{
  int c = 0;
  char *s,tmp[MAILTMPLEN];
  long pos;
  size_t size;
  FILE *f = fopen ((char *) mail_parameters (stream,GET_NEWSRC,stream),"rb");
  if (f) do {                   /* read newsrc */
    for (s = tmp; (s < (tmp + MAILTMPLEN - 1)) && ((c = getc (f)) != EOF) &&
         (c != ':') && (c != '!') && (c != '\015') && (c != '\012'); *s++ = c);
    *s = '\0';                  /* tie off name */
    if ((c==':') || (c=='!')) { /* found newsgroup? */
      if (strcmp (tmp,group))   /* group name match? */
        while ((c != '\015') && (c != '\012') && (c != EOF)) c = getc (f);
      else {                    /* yes, skip leading whitespace */
        do pos = ftell (f);
        while ((c = getc (f)) == ' ');
                                /* count characters in state */
        for (size = 0; (c != '\015') && (c != '\012') && (c != EOF); size++)
          c = getc (f);
                                /* now copy it */
        s = (char *) fs_get (size + 1);
        fseek (f,pos,L_SET);
        fread (s,(size_t) 1,size,f);
        s[size] = '\0';         /* tie off string */
        fclose (f);             /* all done - close the file */
        return s;
      }
    }
  } while (f && (c != EOF));    /* until file closed or EOF */
  //***sprintf (tmp,"No state for newsgroup %.80s found",group);
  //*** MM_LOG (tmp,WARN);
  if (f) fclose (f);            /* close the file */
  return NIL;                   /* not found return */
}

/* Check UID in newsgroup state
 * Accepts: newsgroup state string
 *          uid
 *          returned recent count
 *          returned unseen count
 */

void Newsrc_check_uid (char *state,unsigned long uid,unsigned long *recent,
                       unsigned long *unseen)
{
  unsigned long i,j;
  while (*state) {              /* until run out of state string */
                                /* collect a number */
    for (i = 0; isdigit (*state); i = i*10 + (*state++ - '0'));
    if (*state != '-') j = i;   /* coerce single mesage into range */
    else {                      /* have a range */
      for (j = 0; isdigit (*++state); j = j*10 + (*state - '0'));
      if (!j) j = i;            /* guard against -0 */
      if (j < i) return;        /* bogon if end less than start */
    }
    if (*state == ',') state++; /* skip past comma */
    else if (*state) return;    /* otherwise it's a bogon */
    if (uid <= j) {             /* covered by upper bound? */
      if (uid < i) ++*unseen;   /* unseen if not covered by lower bound */
      return;                   /* don't need to look further */
    }
  }
  ++*unseen;                    /* not found in any range, message is unseen */
  ++*recent;                    /* and recent */
}