Initial revision

1 files changed, 70 insertions, 0 deletions

diff --git a/tildexpand.c b/tildexpand.c
new file mode 100644
index 00000000..e4b57091
--- /dev/null
+++ b/tildexpand.c
@@ -0,0 +1,70 @@
+/*
+
+tildexpand.c
+
+Author: Tatu Ylonen <ylo@cs.hut.fi>
+
+Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+                   All rights reserved
+
+Created: Wed Jul 12 01:07:36 1995 ylo
+
+*/
+
+#include "includes.h"
+RCSID("$Id: tildexpand.c,v 1.1 1999/10/27 03:42:46 damien Exp $");
+
+#include "xmalloc.h"
+#include "ssh.h"
+
+/* Expands tildes in the file name.  Returns data allocated by xmalloc.
+   Warning: this calls getpw*. */
+
+char *tilde_expand_filename(const char *filename, uid_t my_uid)
+{
+  const char *cp;
+  unsigned int userlen;
+  char *expanded;
+  struct passwd *pw;
+  char user[100];
+
+  /* Return immediately if no tilde. */
+  if (filename[0] != '~')
+    return xstrdup(filename);
+
+  /* Skip the tilde. */
+  filename++;
+
+  /* Find where the username ends. */
+  cp = strchr(filename, '/');
+  if (cp)
+    userlen = cp - filename;  /* Have something after username. */
+  else
+    userlen = strlen(filename); /* Nothign after username. */
+  if (userlen == 0)
+    pw = getpwuid(my_uid);  /* Own home directory. */
+  else
+    {
+      /* Tilde refers to someone elses home directory. */
+      if (userlen > sizeof(user) - 1)
+	fatal("User name after tilde too long.");
+      memcpy(user, filename, userlen);
+      user[userlen] = 0;
+      pw = getpwnam(user);
+    }
+
+  /* Check that we found the user. */
+  if (!pw)
+    fatal("Unknown user %100s.", user);
+  
+  /* If referring to someones home directory, return it now. */
+  if (!cp)
+    { /* Only home directory specified */
+      return xstrdup(pw->pw_dir);
+    }
+  
+  /* Build a path combining the specified directory and path. */
+  expanded = xmalloc(strlen(pw->pw_dir) + strlen(cp + 1) + 2);
+  sprintf(expanded, "%s/%s", pw->pw_dir, cp + 1);
+  return expanded;
+}