168 lines
3.4 KiB
C
168 lines
3.4 KiB
C
/* siteexclude.c - check article id for excluded sites
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*
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* Copyright (C) 1995 Peter Fox <fox@roestock.demon.co.uk>
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*
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* This code may be freely copied in it's entirety, but the
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* above notice may not be removed or altered without
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* reference to the author.
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* Individuals may make changes for their own use, however
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* any changed copies may not be distributed without
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* reference to the author.
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* There isn't any guarantee of usefulness or efficacy for
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* any particular purpose. Take it as it is.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "syslog.h"
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#include "conf.h"
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#ifdef TEST
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#define SITEEXCLUDING
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#endif /*TEST*/
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#ifdef SITEEXCLUDING
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typedef struct slist
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{
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struct slist *next;
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char *str;
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} SLIST, *SLISTPTR;
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#define HASHSIZE 256
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#define HASHFN(x) (((x[1] & 15) << 4)|(x[2] & 15)) /* x is (char *), skip '@' */
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#ifdef TEST
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#define SITEFILE "./sites"
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#define DROPFILE "./dropped"
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#define log_msg printf
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#define log_sys printf
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#define debug_flag 1
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#else /*!TEST*/
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extern int debug_flag;
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#ifndef SITEFILE
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#define SITEFILE "/var/lib/news/excludesites"
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#endif /*SITEFILE*/
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#ifndef DROPFILE
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#define DROPFILE "/var/lib/news/droppedarticles"
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#endif /*DROPFILE*/
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#endif /*TEST*/
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SLIST hash[HASHSIZE];
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static FILE *dropfp = (FILE*)0;
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site_init()
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{
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int i;
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FILE *fp;
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char linbuf[BUFSIZ];
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SLISTPTR ptr;
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int entries, collisions;
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entries = 0;
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collisions = 0;
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for(i = 0; i < HASHSIZE; i++)
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{
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hash[i].next = (SLISTPTR)0;
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hash[i].str = (char *)0;
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}
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if(!(fp = fopen(SITEFILE, "r")))
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{
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log_msg("site_init: warning - no site exclude file %s", SITEFILE);
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return;
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}
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if(!(dropfp = fopen(DROPFILE, "a")))
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{
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log_msg("site_init: warning - cannot open file %s for append, dropped articles logged instead", DROPFILE);
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}
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else
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fprintf(dropfp, "-----\n");
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/* File contains lines with complete site names to exclude */
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/* We add the leading @ and trailing > */
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linbuf[0] = '@';
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while(1)
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{
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/* Read in a line */
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(void) fgets(linbuf+1, sizeof (linbuf)-2, fp);
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if(feof(fp))
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break;
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/* If a read error then report it and abort */
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if (ferror(fp))
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{
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log_sys("site_init: error reading %s", SITEFILE);
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break;
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}
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if(linbuf[1])
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{
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/* Kill the \n */
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linbuf[strlen(linbuf)-1] = '>';
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entries++;
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ptr = &hash[HASHFN(linbuf)];
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if(debug_flag)
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fprintf(stderr, "'%s: %08lx'\n", linbuf, ptr);
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if(!ptr->str)
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ptr->str = strdup(linbuf);
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else
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{
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/* Run along to the last in line */
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while(ptr->next)
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ptr = ptr->next;
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ptr->next = (SLISTPTR)malloc(sizeof(SLIST));
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ptr = ptr->next;
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ptr->next = (SLISTPTR)0;
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ptr->str = strdup(linbuf);
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collisions++;
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}
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}
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}
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fclose(fp);
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if(debug_flag)
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log_msg("site_init: site exclude file %s read: %d entries, %d collisions",
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SITEFILE, entries, collisions);
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}
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site_check(char *site)
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{
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SLISTPTR ptr;
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ptr = &hash[HASHFN(site)];
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if(debug_flag)
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fprintf(stderr, " '%s: %08lx'", site, ptr);
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if(!ptr->str)
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return(0);
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while(ptr)
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{
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if(strcmp(site, ptr->str) == 0)
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return(1);
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ptr = ptr->next;
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}
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return(0);
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}
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site_droparticle(char *id)
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{
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if(dropfp)
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fprintf(dropfp, "%s\n", id);
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else
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log_msg("Excluded article: %s", id);
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}
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site_close()
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{
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if(dropfp)
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fclose(dropfp);
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}
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#ifdef TEST
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main(int argc, char **argv)
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{
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site_init();
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argv++;
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argc--;
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while(argc--)
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{
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if(site_check(*argv))
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printf("Found %s\n", *argv);
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argv++;
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}
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return(0);
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}
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#endif /*TEST*/
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#endif /* SITEEXCLUDING */
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