Rename mu_locus_tracker to mu_linetrack

@@ -17,13 +17,14 @@ struct mu_locus_range
   struct mu_locus_point end;
 };
 
-typedef struct mu_locus_track *mu_locus_track_t;
+typedef struct mu_linetrack *mu_linetrack_t;
 
-struct mu_locus_track_stat
+struct mu_linetrack_stat
 {
-  unsigned start_line;
-  size_t n_lines;
-  size_t n_chars;
+  unsigned start_line;  /* Start line number (1-based) */
+  size_t n_lines;       /* Number of lines, including the recent (incomplete)
+			   one */
+  size_t n_chars;       /* Total number of characters */
 };
   
 int mu_ident_ref (char const *name, char const **refname);
@@ -47,17 +48,15 @@ mu_locus_point_same_line (struct mu_locus_point const *a,
 void mu_lrange_debug (struct mu_locus_range const *loc,
 		      char const *fmt, ...);
 
-int mu_locus_track_create (mu_locus_track_t *ret,
+int mu_linetrack_create (mu_linetrack_t *ret,
 			   char const *file_name, size_t max_lines);
-void mu_locus_track_free (mu_locus_track_t trk);
-void mu_locus_track_destroy (mu_locus_track_t *trk);
-size_t mu_locus_track_level (mu_locus_track_t trk);
-void mu_locus_tracker_advance (struct mu_locus_track *trk,
-			       struct mu_locus_range *loc,
-			       char const *text, size_t leng);
-int mu_locus_tracker_retreat (struct mu_locus_track *trk, size_t n);
-int mu_locus_tracker_stat (struct mu_locus_track *trk,
-			   struct mu_locus_track_stat *st);
+void mu_linetrack_free (mu_linetrack_t trk);
+void mu_linetrack_destroy (mu_linetrack_t *trk);
+void mu_linetrack_advance (mu_linetrack_t trk,
+			   struct mu_locus_range *loc,
+			   char const *text, size_t leng);
+int mu_linetrack_retreat (mu_linetrack_t trk, size_t n);
+int mu_linetrack_stat (mu_linetrack_t trk, struct mu_linetrack_stat *st);
 
 
 void mu_stream_print_locus_range (mu_stream_t stream,

@@ -20,7 +20,7 @@ noinst_LTLIBRARIES = liblocus.la
 liblocus_la_SOURCES = \
  ident.c\
  debug.c\
- tracker.c
+ linetrack.c
 
 AM_CPPFLAGS = @MU_LIB_COMMON_INCLUDES@ -I/libmailutils
 

@@ -4,22 +4,36 @@
 #include <mailutils/locus.h>
 #include <mailutils/error.h>
 
-struct mu_locus_track
+/* The line-tracker structure keeps track of the last N lines read from a
+   text input file.  For each line read it keeps the number of characters
+   in that line including the newline.  This information is stored in a
+   syclic stack of N elements.  Top of stack always represents the current
+   line.  For the purpose of line tracker, current line is the line that is
+   being visited, such that its final newline character has not yet been
+   seen.  Once the newline is seen, the line is pushed on stack, and a new
+   current line is assumed.
+
+   The value of N must not be less than 2.
+*/
+struct mu_linetrack
 {
-  char const *file_name;     /* Name of the source file */
-  size_t max_lines;          /* Max. number of lines history kept by tracker */
-  size_t head;               /* Bottom of stack */
-  size_t level;              /* Number of elements on stack */
-  unsigned hline;            /* Number of line corresponding to cols[head] */
-  unsigned *cols;            /* Cyclic stack */
+  char const *file_name; /* Name of the source file */
+  size_t max_lines;      /* Max. number of lines history kept by tracker (N) */
+  size_t head;           /* Index of the eldest element on stack */
+  size_t tos;            /* Index of the most recent element on stack
+			    (< max_lines) */
+  unsigned hline;        /* Number of line corresponding to cols[head] */
+  unsigned *cols;        /* Cyclic stack or character counts.
+			    Number of characters in line (hline + n) is
+			    cols[head + n] (0 <= n <= tos). */
 };
 
 int
-mu_locus_track_create (mu_locus_track_t *ret,
+mu_linetrack_create (mu_linetrack_t *ret,
 		       char const *file_name, size_t max_lines)
 {
   int rc;
-  struct mu_locus_track *trk;
+  struct mu_linetrack *trk;
   
   trk = malloc (sizeof *trk);
   if (!trk)
@@ -43,7 +57,7 @@ mu_locus_track_create (mu_locus_track_t *ret,
     max_lines = 2;
   trk->max_lines = max_lines;
   trk->head = 0;
-  trk->level = 0;
+  trk->tos = 0;
   trk->hline = 1;
   trk->cols[0] = 0;
   
@@ -52,7 +66,7 @@ mu_locus_track_create (mu_locus_track_t *ret,
 }
 
 void
-mu_locus_track_free (mu_locus_track_t trk)
+mu_linetrack_free (mu_linetrack_t trk)
 {
   if (trk)
     {
@@ -63,54 +77,48 @@ mu_locus_track_free (mu_locus_track_t trk)
 }
 
 void
-mu_locus_track_destroy (mu_locus_track_t *trk)
+mu_linetrack_destroy (mu_linetrack_t *trk)
 {
   if (trk)
     {
-      mu_locus_track_free (*trk);
+      mu_linetrack_free (*trk);
       *trk = NULL;
     }
 }   
 
-size_t
-mu_locus_track_level (mu_locus_track_t trk)
-{
-  return trk->level;
-}
-
 static inline unsigned *
-cols_tos_ptr (mu_locus_track_t trk)
+cols_tos_ptr (mu_linetrack_t trk)
 {
-  return &trk->cols[(trk->head + trk->level) % trk->max_lines];
+  return &trk->cols[(trk->head + trk->tos) % trk->max_lines];
 }
 
 static inline unsigned
-cols_peek (mu_locus_track_t trk, size_t n)
+cols_peek (mu_linetrack_t trk, size_t n)
 {
   return trk->cols[(trk->head + n) % trk->max_lines];
 }
 
 static inline unsigned *
-push (mu_locus_track_t trk)
+push (mu_linetrack_t trk)
 {
   unsigned *ptr;
-  if (trk->level == trk->max_lines)
+  if (trk->tos == trk->max_lines - 1)
     {
       trk->head++;
       trk->hline++;
     }
   else
-    trk->level++;
+    trk->tos++;
   *(ptr = cols_tos_ptr (trk)) = 0;
   return ptr;
 }
 
 static inline unsigned *
-pop (mu_locus_track_t trk)
+pop (mu_linetrack_t trk)
 {
-  if (trk->level == 0)
+  if (trk->tos == 0)
     return NULL;
-  trk->level--;
+  trk->tos--;
   return cols_tos_ptr (trk);
 }
 
@@ -119,12 +127,11 @@ pop (mu_locus_track_t trk)
 #endif
 
 int
-mu_locus_tracker_stat (struct mu_locus_track *trk,
-		       struct mu_locus_track_stat *st)
+mu_linetrack_stat (struct mu_linetrack *trk, struct mu_linetrack_stat *st)
 {
   size_t i, nch = 0;
 
-  for (i = 0; i <= trk->level; i++)
+  for (i = 0; i <= trk->tos; i++)
     {
       unsigned n = cols_peek (trk, i);
       if (SIZE_MAX - nch < n)
@@ -133,14 +140,16 @@ mu_locus_tracker_stat (struct mu_locus_track *trk,
     }
   
   st->start_line = trk->hline;
-  st->n_lines = trk->level;
+  st->n_lines = trk->tos + 1;
   st->n_chars = nch;
+
+  return 0;
 }
     
 void
-mu_locus_tracker_advance (struct mu_locus_track *trk,
-			  struct mu_locus_range *loc,
-			  char const *text, size_t leng)
+mu_linetrack_advance (struct mu_linetrack *trk,
+		      struct mu_locus_range *loc,
+		      char const *text, size_t leng)
 {
   unsigned *ptr;
 
@@ -148,7 +157,7 @@ mu_locus_tracker_advance (struct mu_locus_track *trk,
     return;
   
   loc->beg.mu_file = loc->end.mu_file = trk->file_name;
-  loc->beg.mu_line = trk->hline + trk->level;
+  loc->beg.mu_line = trk->hline + trk->tos;
   ptr = cols_tos_ptr (trk);
   loc->beg.mu_col = *ptr + 1;
   while (leng--)
@@ -160,14 +169,14 @@ mu_locus_tracker_advance (struct mu_locus_track *trk,
     }
   if (*ptr)
     {
-      loc->end.mu_line = trk->hline + trk->level;
+      loc->end.mu_line = trk->hline + trk->tos;
       loc->end.mu_col = *ptr;
     }
   else
     {
       /* Text ends with a newline.  Keep the previos line number. */
-      loc->end.mu_line = trk->hline + trk->level - 1;
-      loc->end.mu_col = cols_peek (trk, trk->level - 1) - 1;
+      loc->end.mu_line = trk->hline + trk->tos - 1;
+      loc->end.mu_col = cols_peek (trk, trk->tos - 1) - 1;
       if (loc->end.mu_col + 1 == loc->beg.mu_col)
 	{
 	  /* This happens if the previous line contained only newline. */
@@ -177,11 +186,11 @@ mu_locus_tracker_advance (struct mu_locus_track *trk,
 }
 
 int
-mu_locus_tracker_retreat (struct mu_locus_track *trk, size_t n)
+mu_linetrack_retreat (struct mu_linetrack *trk, size_t n)
 {
-  struct mu_locus_track_stat st;
+  struct mu_linetrack_stat st;
 
-  mu_locus_tracker_stat (trk, &st);
+  mu_linetrack_stat (trk, &st);
   if (n > st.n_chars)
     return ERANGE;
   else

@@ -19,7 +19,7 @@ fsfolder
 globtest
 imapio
 listop
-loctrack
+linetrack
 logstr
 mailcap
 mimehdr

@@ -54,7 +54,7 @@ noinst_PROGRAMS = \
  globtest\
  imapio\
  listop\
- loctrack\
+ linetrack\
  logstr\
  mailcap\
  mimehdr\
@@ -107,7 +107,7 @@ TESTSUITE_AT = \
  inline-comment.at\
  linecon.at\
  list.at\
- loctrack.at\
+ linetrack.at\
  logstr.at\
  mailcap.at\
  mimehdr.at\

@@ -14,12 +14,12 @@
 # You should have received a copy of the GNU General Public License
 # along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
 
-AT_BANNER([Locus tracker])
+AT_BANNER([Line tracker])
 
 m4_pushdef([TRACKTEST],[
 AT_SETUP([$1])
 AT_KEYWORDS([tracker $2])
-AT_CHECK([loctrack liber $3 <<EOT
+AT_CHECK([linetrack liber $3 <<EOT
 $4[]EOT
 ],
 [0],
@@ -103,7 +103,7 @@ three
 liber:2.1-3: two\n
 liber:3.1-5: three
 ],
-[loctrack: retreat count too big
+[linetrack: retreat count too big
 ])
 
-m4_popdef([TRACKTEST])
\ No newline at end of file
+m4_popdef([TRACKTEST])

@@ -6,7 +6,7 @@ main (int argc, char **argv)
 {
   unsigned long max_lines;
   char *end;
-  mu_locus_track_t trk;
+  mu_linetrack_t trk;
   int rc;
   char *buf = NULL;
   size_t size, n;
@@ -26,7 +26,7 @@ main (int argc, char **argv)
       return 1;
     }
 
-  MU_ASSERT (mu_locus_track_create (&trk, argv[1], max_lines));
+  MU_ASSERT (mu_linetrack_create (&trk, argv[1], max_lines));
   while ((rc = mu_stream_getline (mu_strin, &buf, &size, &n)) == 0 && n > 0)
     {
       struct mu_locus_range lr;
@@ -43,17 +43,17 @@ main (int argc, char **argv)
 	      mu_error ("bad number");
 	      continue;
 	    }
-	  rc = mu_locus_tracker_retreat (trk, x);
+	  rc = mu_linetrack_retreat (trk, x);
 	  if (rc == ERANGE)
 	    mu_error ("retreat count too big");
 	  else if (rc)
-	    mu_diag_funcall (MU_DIAG_ERROR, "mu_locus_tracker_retreat", buf+2,
+	    mu_diag_funcall (MU_DIAG_ERROR, "mu_linetrack_retreat", buf+2,
 			     rc);
 	}
       else
 	{
 	  mu_c_str_unescape (buf, "\\\n", "\\n", &tok);
-	  mu_locus_tracker_advance (trk, &lr, tok, strlen (tok));
+	  mu_linetrack_advance (trk, &lr, tok, strlen (tok));
 	  free (tok);
 	  mu_stream_lprintf (mu_strout, &lr, "%s\n", buf);
 	}

@@ -212,4 +212,4 @@ m4_include([msgset.at])
 
 m4_include([globtest.at])
 
-m4_include([loctrack.at])
+m4_include([linetrack.at])