import newlib-2000-02-17 snapshot

1 files changed, 40 insertions, 0 deletions

diff --git a/newlib/libc/unix/getlogin.c b/newlib/libc/unix/getlogin.c
new file mode 100644
index 000000000..7c1f3104e
--- /dev/null
+++ b/newlib/libc/unix/getlogin.c
@@ -0,0 +1,40 @@
+#include <sys/types.h>
+#include <utmp.h>
+#include <fcntl.h>
+#include <_syslist.h>
+
+char *
+getlogin ()
+{
+  int utmp_fd;
+  struct utmp utmp_buf;
+  static char buf[10];
+  extern char *ttyname ();
+  char *tty;
+
+  if (((tty = ttyname (0)) == 0)
+      || ((tty = ttyname (1)) == 0)
+      || ((tty = ttyname (2)) == 0))
+    return 0;
+
+  if ((utmp_fd = _open (UTMP_FILE, O_RDONLY)) == -1)
+    return 0;
+
+  if (!strncmp (tty, "/dev/", 5))
+    tty += 5;
+
+  while (_read (utmp_fd, &utmp_buf, sizeof (utmp_buf)) == sizeof (utmp_buf))
+    {
+      if (!strncmp (tty, utmp_buf.ut_line, sizeof (utmp_buf.ut_line))
+	  && utmp_buf.ut_type == USER_PROCESS)
+	{
+	  _close (utmp_fd);
+	  memset (buf, 0, sizeof (buf));
+	  strncpy (buf, utmp_buf.ut_user, sizeof (utmp_buf.ut_user));
+	  return buf;
+	}
+    }
+
+  _close (utmp_fd);
+  return 0;
+}