GNU readline-4.1

1 files changed, 131 insertions, 0 deletions

diff --git a/gnu/lib/libreadline/examples/rl.c b/gnu/lib/libreadline/examples/rl.c
new file mode 100644
index 00000000000..2d1d17e600d
--- /dev/null
+++ b/gnu/lib/libreadline/examples/rl.c
@@ -0,0 +1,131 @@
+/*
+ * rl - command-line interface to read a line from the standard input
+ *      (or another fd) using readline.
+ *
+ * usage: rl [-p prompt] [-u unit] [-d default] [-n nchars]
+ */
+
+#if defined (HAVE_CONFIG_H)
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <sys/types.h>
+#include "posixstat.h"
+
+#if defined (READLINE_LIBRARY)
+#  include "readline.h"
+#  include "history.h"
+#else
+#  include <readline/readline.h>
+#  include <readline/history.h>
+#endif
+
+extern int optind;
+extern char *optarg;
+
+#if !defined (strchr) && !defined (__STDC__)
+extern char *strrchr();
+#endif
+
+static char *progname;
+static char *deftext;
+
+static int
+set_deftext ()
+{
+  if (deftext)
+    {
+      rl_insert_text (deftext);
+      deftext = (char *)NULL;
+      rl_startup_hook = (Function *)NULL;
+    }
+  return 0;
+}
+
+static void
+usage()
+{
+  fprintf (stderr, "%s: usage: %s [-p prompt] [-u unit] [-d default] [-n nchars]\n",
+		progname, progname);
+}
+
+int
+main (argc, argv)
+     int argc;
+     char **argv;
+{
+  char *temp, *prompt;
+  struct stat sb;
+  int opt, fd, nch;
+  FILE *ifp;
+
+  progname = strrchr(argv[0], '/');
+  if (progname == 0)
+    progname = argv[0];
+  else
+    progname++;
+
+  /* defaults */
+  prompt = "readline$ ";
+  fd = nch = 0;
+  deftext = (char *)0;
+
+  while ((opt = getopt(argc, argv, "p:u:d:n:")) != EOF)
+    {
+      switch (opt)
+	{
+	case 'p':
+	  prompt = optarg;
+	  break;
+	case 'u':
+	  fd = atoi(optarg);
+	  if (fd < 0)
+	    {
+	      fprintf (stderr, "%s: bad file descriptor `%s'\n", progname, optarg);
+	      exit (2);
+	    }
+	  break;
+	case 'd':
+	  deftext = optarg;
+	  break;
+	case 'n':
+	  nch = atoi(optarg);
+	  if (nch < 0)
+	    {
+	      fprintf (stderr, "%s: bad value for -n: `%s'\n", progname, optarg);
+	      exit (2);
+	    }
+	  break;
+	default:
+	  usage ();
+	  exit (2);
+	}
+    }
+
+  if (fd != 0)
+    {
+      if (fstat (fd, &sb) < 0)
+	{
+	  fprintf (stderr, "%s: %d: bad file descriptor\n", progname, fd);
+	  exit (1);
+	}
+      ifp = fdopen (fd, "r");
+      rl_instream = ifp;
+    }
+
+  if (deftext && *deftext)
+    rl_startup_hook = set_deftext;
+
+  if (nch > 0)
+    rl_num_chars_to_read = nch;
+
+  temp = readline (prompt);
+
+  /* Test for EOF. */
+  if (temp == 0)
+    exit (1);
+
+  puts (temp);
+  exit (0);
+}