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- /* $Header: mt-write.c,v 4.3.3.2 91/01/16 02:49:17 davison Trn $
- **
- ** $Log: mt-write.c,v $
- ** Revision 4.3.3.2 91/01/16 02:49:17 davison
- ** Tweaked fopen for possible binary open mode.
- **
- ** Revision 4.3.3.1 90/07/24 23:51:18 davison
- ** Initial Trn Release
- **
- */
-
- #include "EXTERN.h"
- #include "common.h"
- #include "mthreads.h"
-
- static FILE *fp_out;
- static int seq;
- static int article_seq;
-
- static int failure;
-
- void write_subjects(), write_authors(), write_roots(), write_ids();
- void write_articles(), write_thread(), write_item();
- void enumerate_articles(), enumerate_thread();
- void free_leftovers();
-
- /* Write out all the data in a packed format that is easy for our newsreader
- ** to use. We free things as we go, when we don't need them any longer. If
- ** we encounter any write errors, the write_item routine sets a failure flag
- ** to halt our writing of the file, but we keep on plugging away to free
- ** everything up.
- */
- int
- write_data( filename )
- char *filename;
- {
- if( filename == Nullch ) {
- failure = 2; /* A NULL filename indicates just free the data */
- } else if( !ensure_path( filename ) ) {
- log_error( "Unable to create path: `%s'.\n", filename );
- failure = 2;
- } else if( (fp_out = fopen( filename, FOPEN_WB )) == Nullfp ) {
- log_error( "Unable to create file: `%s'.\n", filename );
- failure = 2;
- } else {
- failure = 0;
- }
- write_item( &total, sizeof (TOTAL) );
-
- enumerate_articles();
-
- write_authors();
- write_subjects();
- write_roots();
- write_articles();
- write_ids();
- free_leftovers();
-
- if( failure != 2 ) {
- fclose( fp_out );
- }
- if( failure == 1 ) {
- log_error( "Write failed! Removing `%s'.\n", filename );
- unlink( filename );
- }
- return !failure;
- }
-
- /* Recursively descend the article tree, enumerating the articles as we go.
- ** This way we can output the article sequence numbers into the data file.
- */
- void
- enumerate_articles()
- {
- register ROOT *root;
-
- seq = article_seq = 0;
-
- for( root = root_root; root; root = root->link ) {
- root->seq = seq++;
- if( !root->articles ) {
- log_error( "** No articles on this root??\n" );
- continue;
- }
- enumerate_thread( root->articles );
- }
- if( seq != total.root ) {
- log_error( "** Wrote %d roots instead of %d **\n", seq, total.root );
- }
- if( article_seq != total.article ) {
- log_error( "** Wrote %d articles instead of %d **\n", article_seq, total.article );
- }
- }
-
- /* Recursive routine for above-mentioned enumeration. */
- void
- enumerate_thread( article )
- ARTICLE *article;
- {
- while( article ) {
- article->seq = article_seq++;
- if( article->children ) {
- enumerate_thread( article->children );
- }
- article = article->siblings;
- }
- }
-
- #define write_and_free( str_ptr ) /* Comment for makedepend to \
- ** ignore the backslash above */ \
- {\
- register int len = strlen( str_ptr ) + 1;\
- write_item( str_ptr, len );\
- free( str_ptr );\
- string_offset += len;\
- }
-
- MEM_SIZE string_offset;
-
- /* Write out the author information: first the use-counts, then the
- ** name strings all packed together.
- */
- void
- write_authors()
- {
- register AUTHOR *author;
-
- seq = 0;
- for( author = author_root; author; author = author->link ) {
- write_item( &author->count, sizeof (WORD) );
- author->seq = seq++;
- }
- if( seq != total.author ) {
- log_error( "** Wrote %d authors instead of %d **\n",
- seq, total.author );
- }
-
- string_offset = 0;
-
- for( author = author_root; author; author = author->link ) {
- write_and_free( author->name );
- }
- }
-
- /* Write out the subject information: first the packed string data, then
- ** the use-counts. The order is important -- it is the order required
- ** by the roots for their subject structures.
- */
- void
- write_subjects()
- {
- register ROOT *root;
- register SUBJECT *subject;
-
- for( root = root_root; root; root = root->link ) {
- for( subject = root->subjects; subject; subject = subject->link ) {
- write_and_free( subject->str );
- }
- }
- if( string_offset != total.string1 ) {
- log_error( "** Author/subject strings were %ld bytes instead of %ld **\n",
- string_offset, total.string1 );
- }
-
- seq = 0;
- for( root = root_root; root; root = root->link ) {
- for( subject = root->subjects; subject; subject = subject->link ) {
- write_item( &subject->count, sizeof (WORD) );
- subject->seq = seq++;
- }
- }
- if( seq != total.subject ) {
- log_error( "** Wrote %d subjects instead of %d **\n",
- seq, total.subject );
- }
- }
-
- /* Write the roots in a packed format. Interpret the pointers into
- ** sequence numbers as we go.
- */
- void
- write_roots()
- {
- register ROOT *root;
-
- for( root = root_root; root; root = root->link ) {
- p_root.articles = root->articles->seq;
- p_root.root_num = root->root_num;
- p_root.thread_cnt = root->thread_cnt;
- p_root.subject_cnt = root->subject_cnt;
- write_item( &p_root, sizeof (PACKED_ROOT) );
- }
- }
-
- #define rel_article( article, rseq ) ((article)? (article)->seq - (rseq) : 0)
- #define valid_seq( ptr ) ((ptr)? (ptr)->seq : -1)
-
- /* Write all the articles in the same order that we sequenced them. */
- void
- write_articles()
- {
- register ROOT *root;
-
- for( root = root_root; root; root = root->link ) {
- write_thread( root->articles );
- }
- }
-
- /* Recursive routine to write the article in thread order. We depend on
- ** the fact that our first child is the very next article written (if we
- ** have children).
- */
- void
- write_thread( article )
- register ARTICLE *article;
- {
- while( article ) {
- p_article.num = article->num;
- p_article.date = article->date;
- p_article.subject = valid_seq( article->subject );
- p_article.author = valid_seq( article->author );
- p_article.flags = (article->flags & ~NEW_ARTICLE);
- p_article.child_cnt = article->child_cnt;
- p_article.parent = rel_article( article->parent, article->seq );
- p_article.siblings = rel_article( article->siblings, article->seq );
- p_article.root = article->root->seq;
- write_item( &p_article, sizeof (PACKED_ARTICLE) );
- if( article->children ) {
- write_thread( article->children );
- }
- article = article->siblings;
- }
- }
-
- WORD minus_one = -1;
-
- /* Write the message-id strings: each domain name (not including the
- ** ".unknown." domain) followed by all of its associated unique ids.
- ** Then output the article sequence numbers they belong to. This stuff
- ** is last because the newsreader doesn't need to read it.
- */
- void
- write_ids()
- {
- register DOMAIN *domain;
- register ARTICLE *id;
- register DOMAIN *next_domain;
- register ARTICLE *next_id;
-
- string_offset = 0;
-
- for( domain = &unk_domain; domain; domain = domain->link ) {
- if( domain != &unk_domain ) {
- write_and_free( domain->name );
- if( !domain->ids ) {
- log_error( "** Empty domain name!! **\n" );
- }
- }
- for( id = domain->ids; id; id = id->id_link ) {
- write_and_free( id->id );
- }
- }
- if( string_offset != total.string2 ) {
- log_error( "** Message-id strings were %ld bytes (%ld) **\n",
- string_offset, total.string2 );
- }
- for( domain = &unk_domain; domain; domain = next_domain ) {
- next_domain = domain->link;
- for( id = domain->ids; id; id = next_id ) {
- next_id = id->id_link;
- write_item( &id->seq, sizeof (WORD) );
- free( id );
- }
- write_item( &minus_one, sizeof (WORD) );
- if( domain != &unk_domain ) {
- free( domain );
- }
- }
- unk_domain.ids = Nullart;
- unk_domain.link = Null(DOMAIN*);
- }
-
- /* Free everything that's left to free.
- */
- void
- free_leftovers()
- {
- register ROOT *root, *next_root;
- register SUBJECT *subj, *next_subj;
- register AUTHOR *author, *next_author;
-
- for( root = root_root; root; root = next_root ) {
- next_root = root->link;
- for( subj = root->subjects; subj; subj = next_subj ) {
- next_subj = subj->link;
- free( subj );
- }
- free( root );
- }
- for( author = author_root; author; author = next_author ) {
- next_author = author->link;
- free( author );
- }
- root_root = Null(ROOT*);
- author_root = Null(AUTHOR*);
- }
-
- /* This routine will check to be sure that the required path exists for
- ** the data file, and if not it will attempt to create it.
- */
- int
- ensure_path( filename )
- register char *filename;
- {
- int status, pid, w;
- char tmpbuf[1024];
- #ifdef MAKEDIR
- register char *cp, *last;
- register char *tbptr = tmpbuf+5;
-
- if( !(last = rindex( filename, '/' )) ) { /* find filename portion */
- return 1; /* no path, we're fine */
- }
- *last = '\0'; /* truncate path at filename */
- strcpy( tmpbuf, "mkdir" );
-
- for( cp = last;; ) {
- if( stat( filename, &filestat ) >= 0 && (filestat.st_mode & S_IFDIR) ) {
- *cp = '/';
- break;
- }
- if( !(cp = rindex( filename, '/' )) ) {/* find something that exists */
- break;
- }
- *cp = '\0';
- }
-
- for( cp = filename; cp <= last; cp++ ) {
- if( !*cp ) {
- sprintf( tbptr, " %s", filename );
- tbptr += strlen( tbptr ); /* set up for mkdir call */
- *cp = '/';
- }
- }
- if( tbptr == tmpbuf+5 ) {
- return 1;
- }
- #else
- sprintf(tmpbuf,"%s %s %d", filexp(DIRMAKER), filename, 1);
- #endif
-
- if ((pid = vfork()) == 0) {
- execl(SH, SH, "-c", tmpbuf, Nullch);
- _exit(127);
- }
- while ((w = wait(&status)) != pid && w != -1)
- ;
- if (w == -1)
- status = -1;
- return !status;
- }
-
- /* A simple routine to output some data only if we haven't failed any
- ** previous writes.
- */
- void
- write_item( buff, len )
- char *buff;
- int len;
- {
- if( !failure ) {
- if( fwrite( buff, 1, len, fp_out ) < len ) {
- failure = 1;
- }
- }
- }
-