Bundle less (version 444) for Windows.

[apitrace] / thirdparty / less / brac.c

diff --git a/thirdparty/less/brac.c b/thirdparty/less/brac.c
new file mode 100644 (file)
index 0000000..22c71eb
--- /dev/null
+++ b/thirdparty/less/brac.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 1984-2011  Mark Nudelman
+ *
+ * You may distribute under the terms of either the GNU General Public
+ * License or the Less License, as specified in the README file.
+ *
+ * For more information about less, or for information on how to 
+ * contact the author, see the README file.
+ */
+
+
+/*
+ * Routines to perform bracket matching functions.
+ */
+
+#include "less.h"
+#include "position.h"
+
+/*
+ * Try to match the n-th open bracket 
+ *  which appears in the top displayed line (forwdir),
+ * or the n-th close bracket 
+ *  which appears in the bottom displayed line (!forwdir).
+ * The characters which serve as "open bracket" and 
+ * "close bracket" are given.
+ */
+       public void
+match_brac(obrac, cbrac, forwdir, n)
+       register int obrac;
+       register int cbrac;
+       int forwdir;
+       int n;
+{
+       register int c;
+       register int nest;
+       POSITION pos;
+       int (*chget)();
+
+       extern int ch_forw_get(), ch_back_get();
+
+       /*
+        * Seek to the line containing the open bracket.
+        * This is either the top or bottom line on the screen,
+        * depending on the type of bracket.
+        */
+       pos = position((forwdir) ? TOP : BOTTOM);
+       if (pos == NULL_POSITION || ch_seek(pos))
+       {
+               if (forwdir)
+                       error("Nothing in top line", NULL_PARG);
+               else
+                       error("Nothing in bottom line", NULL_PARG);
+               return;
+       }
+
+       /*
+        * Look thru the line to find the open bracket to match.
+        */
+       do
+       {
+               if ((c = ch_forw_get()) == '\n' || c == EOI)
+               {
+                       if (forwdir)
+                               error("No bracket in top line", NULL_PARG);
+                       else
+                               error("No bracket in bottom line", NULL_PARG);
+                       return;
+               }
+       } while (c != obrac || --n > 0);
+
+       /*
+        * Position the file just "after" the open bracket
+        * (in the direction in which we will be searching).
+        * If searching forward, we are already after the bracket.
+        * If searching backward, skip back over the open bracket.
+        */
+       if (!forwdir)
+               (void) ch_back_get();
+
+       /*
+        * Search the file for the matching bracket.
+        */
+       chget = (forwdir) ? ch_forw_get : ch_back_get;
+       nest = 0;
+       while ((c = (*chget)()) != EOI)
+       {
+               if (c == obrac)
+                       nest++;
+               else if (c == cbrac && --nest < 0)
+               {
+                       /*
+                        * Found the matching bracket.
+                        * If searching backward, put it on the top line.
+                        * If searching forward, put it on the bottom line.
+                        */
+                       jump_line_loc(ch_tell(), forwdir ? -1 : 1);
+                       return;
+               }
+       }
+       error("No matching bracket", NULL_PARG);
+}