maint: update copyright years

[bison.git] / src / location.c

diff --git a/src/location.c b/src/location.c
index 4cbfd8db0c03c386e2dae197cefab0ddbccf9366..f565b24aa698724bd9eccace33741f6e9b35aad8 100644 (file)
--- a/src/location.c
+++ b/src/location.c
@@ -1,6 +1,6 @@
 /* Locations for Bison
-   Copyright (C) 2002, 2005, 2006, 2007, 2008, 2009 Free Software Foundation,
-   Inc.
+
+   Copyright (C) 2002, 2005-2013 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -98,40 +98,119 @@ location_compute (location *loc, boundary *cur, char const *token, size_t size)
 
 /* Output to OUT the location LOC.
    Warning: it uses quotearg's slot 3.  */
-void
+unsigned
 location_print (FILE *out, location loc)
 {
+  unsigned res = 0;
   int end_col = 0 != loc.end.column ? loc.end.column - 1 : 0;
-  fprintf (out, "%s",
-           quotearg_n_style (3, escape_quoting_style, loc.start.file));
+  res += fprintf (out, "%s",
+                  quotearg_n_style (3, escape_quoting_style, loc.start.file));
   if (0 <= loc.start.line)
     {
-      fprintf(out, ":%d", loc.start.line);
+      res += fprintf (out, ":%d", loc.start.line);
       if (0 <= loc.start.column)
-        fprintf (out, ".%d", loc.start.column);
+        res += fprintf (out, ".%d", loc.start.column);
     }
   if (loc.start.file != loc.end.file)
     {
-      fprintf (out, "-%s",
-               quotearg_n_style (3, escape_quoting_style, loc.end.file));
+      res += fprintf (out, "-%s",
+                      quotearg_n_style (3, escape_quoting_style,
+                                        loc.end.file));
       if (0 <= loc.end.line)
         {
-          fprintf(out, ":%d", loc.end.line);
+          res += fprintf (out, ":%d", loc.end.line);
           if (0 <= end_col)
-            fprintf (out, ".%d", end_col);
+            res += fprintf (out, ".%d", end_col);
         }
     }
   else if (0 <= loc.end.line)
     {
       if (loc.start.line < loc.end.line)
         {
-          fprintf (out, "-%d", loc.end.line);
+          res += fprintf (out, "-%d", loc.end.line);
           if (0 <= end_col)
-            fprintf (out, ".%d", end_col);
+            res += fprintf (out, ".%d", end_col);
         }
       else if (0 <= end_col && loc.start.column < end_col)
-        fprintf (out, "-%d", end_col);
+        res += fprintf (out, "-%d", end_col);
     }
+
+  return res;
+}
+
+
+/* Persistant data used by location_caret to avoid reopening and rereading the
+   same file all over for each error.  */
+struct caret_info
+{
+  FILE *source;
+  size_t line;
+  size_t offset;
+};
+
+static struct caret_info caret_info = { NULL, 1, 0 };
+
+void
+cleanup_caret ()
+{
+  if (caret_info.source)
+    fclose (caret_info.source);
+}
+
+void
+location_caret (FILE *out, location loc)
+{
+  /* FIXME: find a way to support multifile locations, and only open once each
+     file. That would make the procedure future-proof.  */
+  if (! (caret_info.source
+         || (caret_info.source = fopen (loc.start.file, "r")))
+      || loc.start.column == -1 || loc.start.line == -1)
+    return;
+
+  /* If the line we want to quote is seekable (the same line as the previous
+     location), just seek it. If it was before, we lost track of it, so
+     return to the start of file.  */
+  if (caret_info.line <= loc.start.line)
+    fseek (caret_info.source, caret_info.offset, SEEK_SET);
+  else
+    {
+      caret_info.line = 1;
+      caret_info.offset = 0;
+      fseek (caret_info.source, caret_info.offset, SEEK_SET);
+    }
+
+  /* Advance to the line's position, keeping track of the offset.  */
+  while (caret_info.line < loc.start.line)
+    caret_info.line += fgetc (caret_info.source) == '\n';
+  caret_info.offset = ftell (caret_info.source);
+
+  /* Read the actual line.  Don't update the offset, so that we keep a pointer
+     to the start of the line.  */
+  {
+    char *buf = NULL;
+    size_t size = 0;
+    ssize_t len = getline (&buf, &size, caret_info.source);
+    if (0 < len)
+      {
+        /* The caret of a multiline location ends with the first line.  */
+        int end = loc.start.line != loc.end.line ? len : loc.end.column;
+
+        /* Quote the file, indent by a single column.  */
+        fputc (' ', out);
+        fwrite (buf, 1, len, out);
+
+        /* Print the caret, with the same indent as above.  */
+        fprintf (out, " %*s", loc.start.column - 1, "");
+        {
+          int i = loc.start.column;
+          do
+            fputc ('^', out);
+          while (++i < end);
+        }
+        fputc ('\n', out);
+      }
+    free (buf);
+  }
 }
 
 void
@@ -139,11 +218,11 @@ boundary_set_from_string (boundary *bound, char *loc_str)
 {
   /* Must search in reverse since the file name field may
    * contain `.' or `:'.  */
-  char *delim = strrchr (loc_str, '.');
+  char *delim = mbsrchr (loc_str, '.');
   aver (delim);
   *delim = '\0';
   bound->column = atoi (delim+1);
-  delim = strrchr (loc_str, ':');
+  delim = mbsrchr (loc_str, ':');
   aver (delim);
   *delim = '\0';
   bound->line = atoi (delim+1);