Mon Jun 9 12:55:45 1997 H.J. Lu <hjl@gnu.ai.mit.edu>

	* depend.c (wrap_output): new prototype.

1 files changed, 143 insertions, 0 deletions

diff --git a/gas/depend.c b/gas/depend.c
new file mode 100644
index 0000000..fcb1500
--- /dev/null
+++ b/gas/depend.c
@@ -0,0 +1,143 @@
+/* depend.c - Handle dependency tracking.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+
+   This file is part of GAS, the GNU Assembler.
+
+   GAS is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   GAS is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GAS; see the file COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+#include "as.h"
+
+/* The file to write to, or NULL if no dependencies being kept.  */
+static char *dep_file = NULL;
+
+struct dependency
+{
+  char *file;
+  struct dependency *next;
+};
+
+/* All the files we depend on.  */
+static struct dependency *dep_chain = NULL;
+
+/* Current column in output file.  */
+static int column = 0;
+
+static void wrap_output PARAMS ((FILE *, char *, int));
+
+/* Number of columns allowable.  */
+#define MAX_COLUMNS 72
+
+
+
+/* Start saving dependencies, to be written to FILENAME.  If this is
+   never called, then dependency tracking is simply skipped.  */
+
+void
+start_dependencies (filename)
+     char *filename;
+{
+  dep_file = filename;
+}
+
+/* Noticed a new filename, so try to register it.  */
+
+void
+register_dependency (filename)
+     char *filename;
+{
+  struct dependency *dep;
+
+  if (dep_file == NULL)
+    return;
+
+  for (dep = dep_chain; dep != NULL; dep = dep->next)
+    {
+      if (! strcmp (filename, dep->file))
+	return;
+    }
+
+  dep = (struct dependency *) xmalloc (sizeof (struct dependency));
+  dep->file = xstrdup (filename);
+  dep->next = dep_chain;
+  dep_chain = dep;
+}
+
+/* Append some output to the file, keeping track of columns and doing
+   wrapping as necessary.  */
+
+static void
+wrap_output (f, string, spacer)
+     FILE *f;
+     char *string;
+     int spacer;
+{
+  int len = strlen (string);
+
+  if (len == 0)
+    return;
+
+  if (column && MAX_COLUMNS - 1 /*spacer*/ - 2 /*` \'*/ < column + len)
+    {
+      fprintf (f, " \\\n ");
+      column = 0;
+      if (spacer == ' ')
+	spacer = '\0';
+    }
+
+  if (spacer == ' ')
+    {
+      putc (spacer, f);
+      ++column;
+    }
+
+  fputs (string, f);
+  column += len;
+
+  if (spacer == ':')
+    {
+      putc (spacer, f);
+      ++column;
+    }
+}
+
+/* Print dependency file.  */
+
+void
+print_dependencies ()
+{
+  FILE *f;
+  struct dependency *dep;
+
+  if (dep_file == NULL)
+    return;
+
+  f = fopen (dep_file, "w");
+  if (f == NULL)
+    {
+      as_warn ("Can't open `%s' for writing", dep_file);
+      return;
+    }
+
+  column = 0;
+  wrap_output (f, out_file_name, ':');
+  for (dep = dep_chain; dep != NULL; dep = dep->next)
+    wrap_output (f, dep->file, ' ');
+
+  putc ('\n', f);
+
+  if (fclose (f))
+    as_warn ("Can't close %s", dep_file);
+}