Initial revision

[chise/xemacs-chise.git] / netinstall / concat.cc

diff --git a/netinstall/concat.cc b/netinstall/concat.cc
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+/*
+ * Copyright (c) 2000, Red Hat, Inc.
+ *
+ *     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.
+ *
+ *     A copy of the GNU General Public License can be found at
+ *     http://www.gnu.org/
+ *
+ * Written by DJ Delorie <dj@cygnus.com>
+ *
+ */
+
+/* See concat.h.  Note that we canonicalize the result, this avoids
+   multiple slashes being interpreted as UNCs. */
+
+#include "win32.h"
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+char * CDECL
+concat (char *s, ...)
+{
+  int len;
+  char *rv, *arg;
+  va_list v;
+
+  if (!s)
+    return 0;
+
+  len = strlen (s);
+
+  va_start (v, s);
+  while (1)
+    {
+      arg = va_arg (v, char *);
+      if (arg == 0)
+       break;
+      len += strlen (arg);
+    }
+  va_end (v);
+
+  rv = (char *) malloc (len+1);
+  strcpy (rv, s);
+  va_start (v, s);
+  while (1)
+  {
+    arg = va_arg (v, char *);
+    if (arg == 0)
+      break;
+    strcat (rv, arg);
+  }
+  va_end (v);
+
+  /* concat is only used for urls and files, so we can safely
+     canonicalize the results */
+  char *d;
+  for (s=rv; *s; s++)
+    if (*s == '\\')
+      *s = '/';
+  for (s=d=rv; *s; s++)
+    {
+      *d++ = *s;
+      /* special case for URLs */
+      if (*s == ':' && s[1] == '/' && s[2] == '/' && s > rv+1)
+       {
+         *d++ = *++s;
+         *d++ = *++s;
+       }
+      else if (*s == '/')
+       while (s[1] == '/')
+         s++;
+    }
+  *d = 0;
+
+  return rv;
+}
+
+char *
+backslash (char *s)
+{
+  for (char *t = s; *t; t++)
+    if (*t == '/')
+      *t = '\\';
+  return s;
+}