X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/4c36bc2b8d65cb76480a30b3fcd2d7824ea12de9..ae9c90ba004680b0acfa6ef7aa457c4c0cfc43d7:/src/location.c

diff --git a/src/location.c b/src/location.c
index fa1b53cb..d48a0a13 100644
--- a/src/location.c
+++ b/src/location.c
@@ -42,7 +42,7 @@ add_column_width (int column, char const *buf, size_t bufsize)
   if (buf)
     {
       if (INT_MAX / 2 <= bufsize)
-	return INT_MAX;
+        return INT_MAX;
       width = mbsnwidth (buf, bufsize, 0);
     }
   else
@@ -69,19 +69,19 @@ location_compute (location *loc, boundary *cur, char const *token, size_t size)
     switch (*p)
       {
       case '\n':
-	line += line < INT_MAX;
-	column = 1;
-	p0 = p + 1;
-	break;
+        line += line < INT_MAX;
+        column = 1;
+        p0 = p + 1;
+        break;
 
       case '\t':
-	column = add_column_width (column, p0, p - p0);
-	column = add_column_width (column, NULL, 8 - ((column - 1) & 7));
-	p0 = p + 1;
-	break;
+        column = add_column_width (column, p0, p - p0);
+        column = add_column_width (column, NULL, 8 - ((column - 1) & 7));
+        p0 = p + 1;
+        break;
 
       default:
-	break;
+        break;
       }
 
   cur->line = line;
@@ -90,9 +90,9 @@ location_compute (location *loc, boundary *cur, char const *token, size_t size)
   loc->end = *cur;
 
   if (line == INT_MAX && loc->start.line != INT_MAX)
-    warn_at (*loc, _("line number overflow"));
+    complain (loc, Wother, _("line number overflow"));
   if (column == INT_MAX && loc->start.column != INT_MAX)
-    warn_at (*loc, _("column number overflow"));
+    complain (loc, Wother, _("column number overflow"));
 }
 
 
@@ -138,16 +138,91 @@ location_print (FILE *out, location loc)
   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
 boundary_set_from_string (boundary *bound, char *loc_str)
 {
   /* Must search in reverse since the file name field may
    * contain `.' or `:'.  */
-  char *delim = mbsrchr (loc_str, '.');
+  char *delim = strrchr (loc_str, '.');
   aver (delim);
   *delim = '\0';
   bound->column = atoi (delim+1);
-  delim = mbsrchr (loc_str, ':');
+  delim = strrchr (loc_str, ':');
   aver (delim);
   *delim = '\0';
   bound->line = atoi (delim+1);