[Bug-readline] ^@ inserted when calling rl_delete_text

[Manuel Schölling]

Hi guys,

I'm trying to build a completion function for gnuplot but when I call
rl_delete_text to delete the text to complete I always get the chars ^@
 as a prefix of my completions.
But if I do not want complete a word and press just <tab> to list all
files ^@ is not added (because there is no word to delete and
rl_delete_text is not called).
I'm using readline-5.2_p12-r1 on my Gentoo linux 2.6.25-tuxonice-r1 (64
bit).

My source code (just a minimal example) is at the end of this mail.


Here is an example, this one is working fine:
> command <tab>
result:
> command main.c~, \
        main.c, \
        main.o, \
        a.out
but this one does not work:
> command m<tab>
result:
> command address@hidden@, \
address@hidden@, \
address@hidden


Is this a bug in readline or am I too stupid to use rl_delete_text?

Any hints and tips welcome!
Cheers,
Manuel

--- source code ---
#include <stdio.h>
#include <stdlib.h>
#include <readline/readline.h>
#include <readline/history.h>

int multi_complete(int count, int key);


int main (void)
{
  char *buf;

  //  rl_bind_key ('\t', rl_insert);
  rl_bind_key('\t', multi_complete);

  while (1)
    {
      buf = readline ("> ");

      if (buf == NULL)
        break;

      if (buf[0] != '\0')
        {
          add_history (buf);
          printf ("You entered: %s\n", buf);
        }
      free (buf);
    }
  putchar ('\n');

  exit (EXIT_SUCCESS);
  return 0;
}

int multi_complete(int count, int key) {
  // get tail
  int tail_len = rl_end-rl_point+1;
  char *tail = malloc(tail_len);;
  strncpy(tail,rl_line_buffer+rl_point, tail_len);


  // get file completions
  int end = rl_point;
  char delimiter = 0;
  char found_quote = 0;
  char quote_char = '\0';
  char *text;

  if (rl_point)
    /* This (possibly) changes rl_point.  If it returns a non-zero char,
       we know we have an open quote. */
    quote_char = _rl_find_completion_word (&found_quote, &delimiter);
  rl_completion_found_quote = found_quote;
  rl_completion_quote_character = quote_char;

  int start = rl_point;
  rl_point = end;

  text = rl_copy_text (start, end);
  char **matches = rl_completion_matches(text,
rl_filename_completion_function);

  // remove text to complete and quote
  rl_delete_text(start, end);

  char seperator[2];
  seperator[0] = quote_char;
  seperator[1] = '\0';
  int i;
  for (i = 1; matches[i] != NULL; i++) {
    rl_insert_text(matches[i]);
    rl_insert_text(seperator);
    if (matches[i+1] != NULL) {
      rl_insert_text(tail);
      rl_insert_text(", \\\n\t");
    }
  }

}