Initial revision

1 files changed, 179 insertions, 0 deletions

diff --git a/filter.c b/filter.c
new file mode 100644
index 00000000..0685f69b
--- /dev/null
+++ b/filter.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 1996-8 Michael R. Elkins.
+ * 
+ *     This program 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 of the License, or
+ *     (at your option) any later version.
+ * 
+ *     This program 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 this program; if not, write to the Free Software
+ *     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */ 
+
+#include "mutt.h"
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+
+/* Invokes a commmand on a pipe and optionally connects its stdin and stdout
+ * to the specified handles.
+ */
+pid_t
+mutt_create_filter_fd (const char *cmd, FILE **in, FILE **out, FILE **err,
+		       int fdin, int fdout, int fderr)
+{
+  int pin[2], pout[2], perr[2], thepid;
+
+  if (in)
+  {
+    *in = 0;
+    if (pipe (pin) == -1)
+      return (-1);
+  }
+
+  if (out)
+  {
+    *out = 0;
+    if (pipe (pout) == -1)
+    {
+      if (in)
+      {
+	close (pin[0]);
+	close (pin[1]);
+      }
+      return (-1);
+    }
+  }
+
+  if (err)
+  {
+    *err = 0;
+    if (pipe (perr) == -1)
+    {
+      if (in)
+      {
+	close (pin[0]);
+	close (pin[1]);
+      }
+      if (out)
+      {
+	close (pout[0]);
+	close (pout[1]);
+      }
+      return (-1);
+    }
+  }
+
+  mutt_block_signals_system ();
+
+  if ((thepid = fork ()) == 0)
+  {
+    mutt_unblock_signals_system (0);
+
+    if (in)
+    {
+      close (pin[1]);
+      dup2 (pin[0], 0);
+      close (pin[0]);
+    }
+    else if (fdin != -1)
+    {
+      dup2 (fdin, 0);
+      close (fdin);
+    }
+
+    if (out)
+    {
+      close (pout[0]);
+      dup2 (pout[1], 1);
+      close (pout[1]);
+    }
+    else if (fdout != -1)
+    {
+      dup2 (fdout, 1);
+      close (fdout);
+    }
+
+    if (err)
+    {
+      close (perr[0]);
+      dup2 (perr[1], 2);
+      close (perr[1]);
+    }
+    else if (fderr != -1)
+    {
+      dup2 (fderr, 2);
+      close (fderr);
+    }
+
+    execl (EXECSHELL, "sh", "-c", cmd, NULL);
+    _exit (127);
+  }
+  else if (thepid == -1)
+  {
+    mutt_unblock_signals_system (1);
+
+    if (in)
+    {
+      close (pin[0]);
+      close (pin[1]);
+    }
+    
+    if (out)
+    {
+      close (pout[0]);
+      close (pout[1]);
+    }
+
+    if (err)
+    {
+      close (perr[0]);
+      close (perr[1]);
+    }
+
+    return (-1);
+  }
+
+  if (out)
+  {
+    close (pout[1]);
+    *out = fdopen (pout[0], "r");
+  }
+
+  if (in)
+  {
+    close (pin[0]);
+    *in = fdopen (pin[1], "w");
+  }
+
+  if (err)
+  {
+    close (perr[1]);
+    *err = fdopen (perr[0], "r");
+  }
+
+  return (thepid);
+}
+
+pid_t mutt_create_filter (const char *s, FILE **in, FILE **out, FILE **err)
+{
+  return (mutt_create_filter_fd (s, in, out, err, -1, -1, -1));
+}
+
+int mutt_wait_filter (pid_t pid)
+{
+  int rc;
+  
+  waitpid (pid, &rc, 0);
+  mutt_unblock_signals_system (1);
+  rc = WIFEXITED (rc) ? WEXITSTATUS (rc) : -1;
+  
+  return rc;
+}