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/* ========================================================================
* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* 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: 30 August 2006
*/
#include <ctype.h>
#include <stdio.h>
#include "c-client.h"
#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)
{
if (f1) fclose (f1); /* close file designators */
if (f2) 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)
{
long ret = (f && (fputs (group,f) != EOF) && ((putc (state,f)) != EOF) &&
((putc (' ',f)) != EOF) && (fputs (nl,f) != EOF)) ? LONGT : NIL;
if (fclose (f) == EOF) ret = NIL;
return ret;
}
/* 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)->private.uid > 1) ? 1 : 0;
i <= stream->nmsgs; ++i) {
/* deleted message? */
if ((elt = mail_elt (stream,i))->deleted) {
k = elt->private.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->private.uid - 1) {
/* 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 = strcpy (name,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)->private.uid < i)) unseen = m;
/* skip messages before first value */
while ((m <= stream->nmsgs) &&
((elt = mail_elt (stream,m))->private.uid < i) && m++)
elt->valid = T;
/* do all messages in range */
while ((m <= stream->nmsgs) && (elt = mail_elt (stream,m)) &&
(j ? ((elt->private.uid >= i) && (elt->private.uid <= j)) :
(elt->private.uid == i)) && m++)
elt->valid = elt->deleted = 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 (char *group,MAILSTREAM *stream)
{
long ret = NIL;
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")) {/* have existing newsrc file? */
if (!(bf = fopen ((strcat (strcpy (backup,newsrc),OLDFILESUFFIX)),"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)) 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)) 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 : "\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,NIL);
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? */
ret = ((fputs (group,f) != EOF) && ((putc (':',f)) != EOF) &&
newsrc_newmessages (f,stream,nl[0] ? nl : "\n")) ? LONGT : NIL;
if (fclose (f) == EOF) ret = newsrc_write_error (newsrc,NIL,NIL);
}
else ret = LONGT;
return ret;
}
/* 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,SEEK_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 (unsigned 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 */
}
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