*** empty log message ***

[idzebra-moved-to-github.git] / bfile / bfile.c

diff --git a/bfile/bfile.c b/bfile/bfile.c
index b5be5b5..90a058b 100644 (file)
--- a/bfile/bfile.c
+++ b/bfile/bfile.c
@@ -4,7 +4,44 @@
  * Sebastian Hammer, Adam Dickmeiss
  *
  * $Log: bfile.c,v $
- * Revision 1.7  1994-08-23 14:25:45  quinn
+ * Revision 1.19  1996-02-05 12:28:58  adam
+ * Removed a LOG_LOG message.
+ *
+ * Revision 1.18  1996/01/02  08:59:06  quinn
+ * Changed "commit" setting to "shadow".
+ *
+ * Revision 1.17  1995/12/11  09:03:51  adam
+ * New function: cf_unlink.
+ * New member of commit file head: state (0) deleted, (1) hash file.
+ *
+ * Revision 1.16  1995/12/08  16:21:13  adam
+ * Work on commit/update.
+ *
+ * Revision 1.15  1995/12/01  16:24:28  adam
+ * Commit files use separate meta file area.
+ *
+ * Revision 1.14  1995/12/01  11:37:21  adam
+ * Cached/commit files implemented as meta-files.
+ *
+ * Revision 1.13  1995/11/30  17:00:49  adam
+ * Several bug fixes. Commit system runs now.
+ *
+ * Revision 1.12  1995/11/30  08:33:10  adam
+ * Started work on commit facility.
+ *
+ * Revision 1.11  1995/09/04  12:33:21  adam
+ * Various cleanup. YAZ util used instead.
+ *
+ * Revision 1.10  1994/08/25  10:15:54  quinn
+ * Trivial
+ *
+ * Revision 1.9  1994/08/24  08:45:48  quinn
+ * Using mfile.
+ *
+ * Revision 1.8  1994/08/23  15:03:34  quinn
+ * *** empty log message ***
+ *
+ * Revision 1.7  1994/08/23  14:25:45  quinn
  * Added O_CREAT because some geek wanted it. Sheesh.
  *
  * Revision 1.6  1994/08/23  14:21:38  quinn
@@ -24,41 +61,162 @@
  *
  */
 
-#include <util.h>
-#include <bfile.h>
-#include <sys/types.h>
-#include <fcntl.h>
-#include <unistd.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <assert.h>
+#include <unistd.h>
+
+#include <alexutil.h>
+#include <bfile.h>
+#include "cfile.h"
+
+static MFile_area commit_area = NULL;
+
+void bf_cache (int enableFlag)
+{
+    if (enableFlag)
+    {
+        if (!commit_area)
+            if (res_get (common_resource, "shadow"))
+                commit_area = mf_init ("shadow");
+            else
+            {
+                logf (LOG_FATAL, "Shadow area must be defined if commit"
+                      "is to be enabled");
+                exit (1);
+            }
+    }
+    else
+        commit_area = NULL;
+}
 
 int bf_close (BFile bf)
 {
-    close(bf->fd);
-    xfree(bf);
-    return(0);
+    if (bf->cf)
+        cf_close (bf->cf);
+    mf_close (bf->mf);
+    xfree (bf);
+    return 0;
 }
 
 BFile bf_open (const char *name, int block_size, int wflag)
 {
     BFile tmp = xmalloc(sizeof(BFile_struct));
 
-    if ((tmp->fd = open(name, wflag ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
+    if (commit_area)
+    {
+        FILE *outf;
+        int first_time;
+
+        tmp->mf = mf_open (0, name, block_size, 0);
+        tmp->cf = cf_open (tmp->mf, commit_area, name, block_size,
+                           wflag, &first_time);
+        if (first_time)
+        {
+            outf = fopen ("cache", "a");
+            fprintf (outf, "%s %d\n", name, block_size);
+            fclose (outf);
+        }
+    }
+    else
+    {
+        tmp->mf = mf_open(0, name, block_size, wflag);
+        tmp->cf = NULL;
+    }
+    if (!tmp->mf)
     {
-        log(LOG_FATAL|LOG_ERRNO, "open"); 
-       return(0);
+        logf (LOG_FATAL, "mf_open failed for %s", name);
+        xfree (tmp);
+        return 0;
     }
-    tmp->block_size = block_size;
     return(tmp);
 }
 
 int bf_read (BFile bf, int no, int offset, int num, void *buf)
 {
-    lseek(bf->fd, no * bf->block_size + offset, 0);
-    return(read(bf->fd, buf, num ? num : bf->block_size));
+    int r;
+
+    if (bf->cf && (r=cf_read (bf->cf, no, offset, num, buf)) != -1)
+        return r;
+    return mf_read (bf->mf, no, offset, num, buf);
 }
 
 int bf_write (BFile bf, int no, int offset, int num, const void *buf)
 {
-    lseek(bf->fd, no * bf->block_size + offset, 0);
-    return(write(bf->fd, buf, num ? num : bf->block_size));
+    if (bf->cf)
+        return cf_write (bf->cf, no, offset, num, buf);
+    return mf_write (bf->mf, no, offset, num, buf);
+}
+
+int bf_commitExists (void)
+{
+    FILE *inf;
+
+    inf = fopen ("cache", "r");
+    if (inf)
+    {
+        fclose (inf);
+        return 1;
+    }
+    return 0;
+}
+
+void bf_commitExec (void)
+{
+    FILE *inf;
+    int block_size;
+    char path[256];
+    MFile mf;
+    CFile cf;
+    int first_time;
+
+    assert (commit_area);
+    if (!(inf = fopen ("cache", "r")))
+    {
+        logf (LOG_LOG, "No commit file");
+        return ;
+    }
+    while (fscanf (inf, "%s %d", path, &block_size) == 2)
+    {
+        mf = mf_open (0, path, block_size, 1);
+        cf = cf_open (mf, commit_area, path, block_size, 0, &first_time);
+
+        cf_commit (cf);
+
+        cf_close (cf);
+        mf_close (mf);
+    }
+    fclose (inf);
+}
+
+void bf_commitClean (void)
+{
+    FILE *inf;
+    int block_size;
+    char path[256];
+    MFile mf;
+    CFile cf;
+    int mustDisable = 0;
+    int firstTime;
+
+    if (!commit_area)
+    {
+        bf_cache (1);
+        mustDisable = 1;
+    }
+
+    if (!(inf = fopen ("cache", "r")))
+        return ;
+    while (fscanf (inf, "%s %d", path, &block_size) == 2)
+    {
+        mf = mf_open (0, path, block_size, 0);
+        cf = cf_open (mf, commit_area, path, block_size, 1, &firstTime);
+        cf_unlink (cf);
+        cf_close (cf);
+        mf_close (mf);
+    }
+    fclose (inf);
+    unlink ("cache");
+    if (mustDisable)
+        bf_cache (0);
 }