/*******************************************************************
 * rltest.c		Time stamp: <2017-07-08 21:35:38 hackerb9>
 *
 * Why does bash, once in a bluemoon, crash in readline?
 * Hopefully this program + fuzz will help solve the mystery.
 *
 * Usage:

        export ASAN_OPTIONS=handle_segv=0
        fuzz -t 5 -n 80 `pwd`/a.out
        unset ASAN_OPTIONS
        mv /tmp/a.out.???? crash.me
        cat crash.me | ./a.out >/dev/null

 * You may compile with your system's standard libreadline:

    apt-get install libreadline-dev
    gcc -g -fsanitize=address rltest.c -l readline

 * However, I highly recommend compiling libreadline with
   AddressSanitizer, like so:

    wget ftp://ftp.gnu.org/gnu/readline/readline-7.0.tar.gz
    tar -zxvpf readline-7.0.tar.gz
    mv readline-7.0 readline
    cd readline
    CFLAGS="-g -fsanitize=address" ./configure
    make 2>&1 | tee make.out
    cd ..
    gcc -g -fsanitize=address rltest.c -I. \
        readline/lib{readline,history}.a -lncurses

/*******************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <readline/readline.h>
#include <readline/history.h>

char *rl_gets();


int main() {
  char *line;
  while ((line=rl_gets()) != NULL) {
    printf("%s\n", line);
    fflush(stdout);
  }
  return 0;
}


/*****************************************************************************/
/* rl_gets() is a replacement for gets() from the GNU Readline documentation */
/*****************************************************************************/

/* A static variable for holding the line. */
static char *line_read = (char *)NULL;

/* Read a string, and return a pointer to it.
   Returns NULL on EOF. */
char *rl_gets()
{
  /* If the buffer has already been allocated,
     return the memory to the free pool. */
  if (line_read)
    {
      free (line_read);
      line_read = (char *)NULL;
    }

  /* Get a line from the user. */
  line_read = readline ("");

  /* If the line has any text in it,
     save it on the history. */
  if (line_read && *line_read)
    add_history (line_read);

  return (line_read);
}


/*****************************************/
/* For a good time, try:       		 */
/*      printf '\e\n\eRgy\000' | ./a.out */
/*****************************************/