/* PSPP - a program for statistical analysis.
- Copyright (C) 1997-9, 2000, 2007, 2009, 2010, 2011 Free Software Foundation, Inc.
+ Copyright (C) 1997-9, 2000, 2007, 2009, 2010, 2011, 2013 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <config.h>
+#include <signal.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+
+#if HAVE_READLINE
+#include <readline/readline.h>
+#include <readline/history.h>
+#include <termios.h>
+
+static char *history_file;
+
+static char **complete_command_name (const char *, int, int);
+static char **dont_complete (const char *, int, int);
+static char *command_generator (const char *text, int state);
+
+static const bool have_readline = true;
+
+#else
+static const bool have_readline = false;
+static int rl_end;
+#endif
+
+
#include "ui/terminal/terminal-reader.h"
+#include <sys/select.h>
+#include <sys/time.h>
+#include <sys/types.h>
#include <assert.h>
#include <errno.h>
-#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
-#include "data/file-name.h"
#include "data/settings.h"
#include "language/command.h"
#include "language/lexer/lexer.h"
static void readline_init (void);
static void readline_done (void);
-static struct substring readline_read (enum prompt_style);
+static bool readline_read (struct substring *, enum prompt_style);
/* Display a welcoming message. */
static void
"it\nunder certain conditions; type \"show copying.\" to see the "
"conditions.\nThere is ABSOLUTELY NO WARRANTY for PSPP; type \"show "
"warranty.\" for details.\n", stdout);
- puts (stat_version);
- journal_enable ();
+ puts (announced_version);
+ journal_init ();
}
static struct terminal_reader *
return UP_CAST (r, struct terminal_reader, reader);
}
+
+/* Older libreadline versions do not provide rl_outstream.
+ However, it is almost always going to be the same as stdout. */
+#if ! HAVE_RL_OUTSTREAM
+# define rl_outstream stdout
+#endif
+
+
+#if HAVE_READLINE
+/* Similarly, rl_echo_signal_char is fairly recent.
+ We provide our own crude version if it is not present. */
+#if ! HAVE_RL_ECHO_SIGNAL_CHAR
+static void
+rl_echo_signal_char (int sig)
+{
+#if HAVE_TERMIOS_H
+ struct termios t;
+ if (0 == tcgetattr (0, &t))
+ {
+ cc_t c = t.c_cc[VINTR];
+
+ if (c >= 0 && c <= 'Z' - 'A')
+ fprintf (rl_outstream, "^%c", 'A' + c - 1);
+ else
+ fprintf (rl_outstream, "%c", c);
+ }
+ else
+#endif
+ fprintf (rl_outstream, "^C");
+
+ fflush (rl_outstream);
+}
+#endif
+#endif
+
+
static size_t
terminal_reader_read (struct lex_reader *r_, char *buf, size_t n,
enum prompt_style prompt_style)
output_flush ();
ss_dealloc (&r->s);
- r->s = readline_read (prompt_style);
+ if (! readline_read (&r->s, prompt_style))
+ {
+ *buf = '\n';
+ fprintf (rl_outstream, "\n");
+ return 1;
+ }
r->offset = 0;
r->eof = ss_is_empty (r->s);
r = xzalloc (sizeof *r);
r->reader.class = &terminal_reader_class;
r->reader.syntax = LEX_SYNTAX_INTERACTIVE;
- r->reader.error = LEX_ERROR_INTERACTIVE;
+ r->reader.error = LEX_ERROR_TERMINAL;
r->reader.file_name = NULL;
r->s = ss_empty ();
r->offset = 0;
return &r->reader;
}
\f
+
+
+static const char *
+readline_prompt (enum prompt_style style)
+{
+ switch (style)
+ {
+ case PROMPT_FIRST:
+ return "PSPP> ";
+
+ case PROMPT_LATER:
+ return " > ";
+
+ case PROMPT_DATA:
+ return "data> ";
+
+ case PROMPT_COMMENT:
+ return "comment> ";
+
+ case PROMPT_DOCUMENT:
+ return "document> ";
+
+ case PROMPT_DO_REPEAT:
+ return "DO REPEAT> ";
+ }
+
+ NOT_REACHED ();
+}
+
+
+
+static int pfd[2];
+static bool sigint_received ;
+
+
+/*
+ A function similar to getc from stdio.
+ However this one may be interrupted by SIGINT.
+ If that happens it will return EOF and the global variable
+ sigint_received will be set to true.
+ */
+static int
+interruptible_getc (FILE *fp)
+{
+ int c = 0;
+ int ret = -1;
+ do
+ {
+ struct timeval timeout = {0, 50000};
+ fd_set what;
+ int max_fd = 0;
+ int fd ;
+ FD_ZERO (&what);
+ fd = fileno (fp);
+ max_fd = (max_fd > fd) ? max_fd : fd;
+ FD_SET (fd, &what);
+ fd = pfd[0];
+ max_fd = (max_fd > fd) ? max_fd : fd;
+ FD_SET (fd, &what);
+ ret = select (max_fd + 1, &what, NULL, NULL, &timeout);
+ if ( ret == -1 && errno != EINTR)
+ {
+ perror ("Select failed");
+ continue;
+ }
+
+ if (ret > 0 )
+ {
+ if (FD_ISSET (pfd[0], &what))
+ {
+ char dummy[1];
+ read (pfd[0], dummy, 1);
+ sigint_received = true;
+ return EOF;
+ }
+ }
+ }
+ while (ret <= 0);
+
+ /* This will not block! */
+ read (fileno (fp), &c, 1);
+
+ return c;
+}
+
+
+
#if HAVE_READLINE
-#include <readline/readline.h>
-#include <readline/history.h>
-static char *history_file;
+static void
+handler (int sig)
+{
+ rl_end = 0;
+
+ write (pfd[1], "x", 1);
+ rl_echo_signal_char (sig);
+}
-static char **complete_command_name (const char *, int, int);
-static char **dont_complete (const char *, int, int);
-static char *command_generator (const char *text, int state);
static void
readline_init (void)
{
+ if ( 0 != pipe2 (pfd, O_NONBLOCK))
+ perror ("Cannot create pipe");
+
+ if ( SIG_ERR == signal (SIGINT, handler))
+ perror ("Cannot add signal handler");
+
+ rl_catch_signals = 0;
+ rl_getc_function = interruptible_getc;
rl_basic_word_break_characters = "\n";
using_history ();
stifle_history (500);
free (history_file);
}
-static const char *
-readline_prompt (enum prompt_style style)
-{
- switch (style)
- {
- case PROMPT_FIRST:
- return "PSPP> ";
-
- case PROMPT_LATER:
- return " > ";
-
- case PROMPT_DATA:
- return "data> ";
-
- case PROMPT_COMMENT:
- return "comment> ";
-
- case PROMPT_DOCUMENT:
- return "document> ";
-
- case PROMPT_DO_REPEAT:
- return "DO REPEAT> ";
- }
-
- NOT_REACHED ();
-}
-
-static struct substring
-readline_read (enum prompt_style style)
+/* Prompt the user for a line of input and return it in LINE.
+ Returns true if the LINE should be considered valid, false otherwise.
+ */
+static bool
+readline_read (struct substring *line, enum prompt_style style)
{
char *string;
rl_attempted_completion_function = (style == PROMPT_FIRST
? complete_command_name
: dont_complete);
+ sigint_received = false;
string = readline (readline_prompt (style));
+ if (sigint_received)
+ {
+ *line = ss_empty ();
+ return false;
+ }
+
if (string != NULL)
{
char *end;
end = strchr (string, '\0');
*end = '\n';
- return ss_buffer (string, end - string + 1);
+ *line = ss_buffer (string, end - string + 1);
}
else
- return ss_empty ();
+ *line = ss_empty ();
+
+ return true;
}
/* Returns a set of command name completions for TEXT.
name = cmd_complete (text, &cmd);
return name ? xstrdup (name) : NULL;
}
+
#else /* !HAVE_READLINE */
+
static void
readline_init (void)
{
{
}
-static struct substring
-readline_read (enum prompt_style style)
+static bool
+readline_read (struct substring *line, enum prompt_style style)
{
- const char *prompt = prompt_get (style);
- struct string line;
+ struct string string;
+ const char *prompt = readline_prompt (style);
fputs (prompt, stdout);
fflush (stdout);
- ds_init_empty (&line);
- ds_read_line (&line, stdin, SIZE_MAX);
-
- return line.ss;
+ ds_init_empty (&string);
+ ds_read_line (&string, stdin, SIZE_MAX);
+
+ *line = string.ss;
+
+ return false;
}
#endif /* !HAVE_READLINE */
projects / pspp / blobdiff