--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/misc/exec.cc	Wed Jan 16 22:39:43 2008 +0100
@@ -0,0 +1,89 @@
+// Copyright (C) 1999,2000 Bruce Guenter <bruceg@em.ca>
+//
+// 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+#include <config.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include "exec.h"
+#include "config/configrc.h"
+
+int presetenv(const char* prefix, const mystring& value)
+{
+  unsigned plen = strlen(prefix);
+  char* tmp = new char[plen+value.length()+1];
+  strcpy(tmp, prefix);
+  strcpy(tmp+plen, value.c_str());
+  return putenv(tmp);
+  
+  // Note that tmp is never freed.  This was done as a result of problems
+  // using putenv with glibc 2.1, where freeing the pointer passed to
+  // putenv appeared to cause garbage to enter the environment.
+  //mystring tmp = prefix + value;
+  //return putenv(tmp.c_str());
+}
+
+int execute_one(const char* args[])
+{
+  int pid = fork();
+  switch(pid) {
+  case -1:
+    return -1;
+  case 0:
+    execvp(args[0], (char**)args);
+    exit(127);
+  default:
+    for(;;) {
+      int status;
+      if(waitpid(pid, &status, 0) == -1) {
+	if(errno != EINTR)
+	  return -1;
+      } else {
+	if(WIFEXITED(status))
+	  return WEXITSTATUS(status);
+	else
+	  return -1;
+      }
+    }
+  }
+  return 0;
+}
+ 
+static int execute(const configuration* node, const mystring& name)
+{
+  if(node->parent) {
+    int i = execute(node->parent, name);
+    if(i || (node->parent->directory == node->directory))
+      return i;
+  }
+  mystring path = node->directory + "/" + name;
+  struct stat buf;
+  if(stat(path.c_str(), &buf) != -1 && buf.st_mode & 0111) {
+    const char* args[] = { path.c_str(), 0 };
+    return execute_one(args);
+  }
+  else
+    return 0;
+}
+  
+int execute(const mystring& name)
+{
+  int i = execute(config, name);
+  return (i == 99) ? 0 : i;
+}