create personal config if it does not exist

src/utils/copyfile.cpp

@@ -0,0 +1,64 @@
+#ifndef lint
+static char rcsid[] = "@(#$Id: copyfile.cpp,v 1.1 2005-12-05 14:09:16 dockes Exp $ (C) 2005 J.F.Dockes";
+#endif
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <string>
+using std::string;
+
+#include "debuglog.h"
+
+#define CPBSIZ 8192
+#define COPYFILE_NOERRUNLINK 1
+
+bool copyfile(const char *src, const char *dst, string &reason, int flags = 0)
+{
+  int sfd = -1;
+  int dfd = -1;
+  bool ret = false;
+  char buf[CPBSIZ];
+
+  reason.erase();
+
+  LOGDEB(("copyfile: %s to %s\n", src, dst));
+
+  if ((sfd = open(src, O_RDONLY)) < 0) {
+      reason += string("open ") + src + ": " + strerror(errno);
+      goto out;
+  }
+
+  if ((dfd = open(dst, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
+      reason += string("open/creat ") + dst + ": " + strerror(errno);
+      // If we fail because of an open/truncate error, we do not want to unlink
+      // the file, we might succeed...
+      flags |= COPYFILE_NOERRUNLINK;
+      goto out;
+  }
+
+  for (;;) {
+      int didread;
+      didread = read(sfd, buf, CPBSIZ);
+      if (didread < 0) {
+	  reason += string("read src ") + src + ": " + strerror(errno);
+	  goto out;
+      }
+      if (didread == 0)
+	  break;
+      if (write(dfd, buf, didread) != didread) {
+	  reason += string("write dst ") + src + ": " + strerror(errno);
+	  goto out;
+      }
+  }
+  ret = true;
+ out:
+  if (ret == false && !(flags&COPYFILE_NOERRUNLINK))
+    unlink(dst);
+  if (sfd >= 0)
+    close(sfd);
+  if (dfd >= 0)
+    close(dfd);
+  return ret;
+}

src/utils/copyfile.h

@@ -0,0 +1,12 @@
+#ifndef _COPYFILE_H_INCLUDED_
+#define _COPYFILE_H_INCLUDED_
+/* @(#$Id: copyfile.h,v 1.1 2005-12-05 14:09:16 dockes Exp $  (C) 2004 J.F.Dockes */
+
+#include <string>
+
+enum CopyfileFlags {COPYFILE_NONE = 0, COPYFILE_NOERRUNLINK = 1};
+
+extern bool copyfile(const char *src, const char *dst, std::string &reason,
+		     int flags = 0);
+
+#endif /* _COPYFILE_H_INCLUDED_ */