This file is read.def, from which is created read.c.
It implements the builtin "read" in Bash.
-Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
+Copyright (C) 1987-2021 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
-Bash is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 1, or (at your option) any later
-version.
+Bash is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
-Bash is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-for more details.
+Bash is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
-You should have received a copy of the GNU General Public License along
-with Bash; see the file COPYING. If not, write to the Free Software
-Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+You should have received a copy of the GNU General Public License
+along with Bash. If not, see <http://www.gnu.org/licenses/>.
$PRODUCES read.c
$BUILTIN read
$FUNCTION read_builtin
-$SHORT_DOC read [-r] [-p prompt] [-a array] [-e] [name ...]
-One line is read from the standard input, and the first word is
-assigned to the first NAME, the second word to the second NAME, and so
-on, with leftover words assigned to the last NAME. Only the characters
-found in $IFS are recognized as word delimiters. The return code is
-zero, unless end-of-file is encountered. If no NAMEs are supplied, the
-line read is stored in the REPLY variable. If the -r option is given,
-this signifies `raw' input, and backslash escaping is disabled. If
-the `-p' option is supplied, the string supplied as an argument is
-output without a trailing newline before attempting to read. If -a is
-supplied, the words read are assigned to sequential indices of ARRAY,
-starting at zero. If -e is supplied and the shell is interactive,
-readline is used to obtain the line.
+$SHORT_DOC read [-ers] [-a array] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [name ...]
+Read a line from the standard input and split it into fields.
+
+Reads a single line from the standard input, or from file descriptor FD
+if the -u option is supplied. The line is split into fields as with word
+splitting, and the first word is assigned to the first NAME, the second
+word to the second NAME, and so on, with any leftover words assigned to
+the last NAME. Only the characters found in $IFS are recognized as word
+delimiters. By default, the backslash character escapes delimiter characters
+and newline.
+
+If no NAMEs are supplied, the line read is stored in the REPLY variable.
+
+Options:
+ -a array assign the words read to sequential indices of the array
+ variable ARRAY, starting at zero
+ -d delim continue until the first character of DELIM is read, rather
+ than newline
+ -e use Readline to obtain the line
+ -i text use TEXT as the initial text for Readline
+ -n nchars return after reading NCHARS characters rather than waiting
+ for a newline, but honor a delimiter if fewer than
+ NCHARS characters are read before the delimiter
+ -N nchars return only after reading exactly NCHARS characters, unless
+ EOF is encountered or read times out, ignoring any
+ delimiter
+ -p prompt output the string PROMPT without a trailing newline before
+ attempting to read
+ -r do not allow backslashes to escape any characters
+ -s do not echo input coming from a terminal
+ -t timeout time out and return failure if a complete line of
+ input is not read within TIMEOUT seconds. The value of the
+ TMOUT variable is the default timeout. TIMEOUT may be a
+ fractional number. If TIMEOUT is 0, read returns
+ immediately, without trying to read any data, returning
+ success only if input is available on the specified
+ file descriptor. The exit status is greater than 128
+ if the timeout is exceeded
+ -u fd read from file descriptor FD instead of the standard input
+
+Exit Status:
+The return code is zero, unless end-of-file is encountered, read times out
+(in which case it's greater than 128), a variable assignment error occurs,
+or an invalid file descriptor is supplied as the argument to -u.
$END
#include <config.h>
+#include "bashtypes.h"
+#include "posixstat.h"
+
#include <stdio.h>
+#include "bashansi.h"
+
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
+#include <signal.h>
+#include <errno.h>
+
+#ifdef __CYGWIN__
+# include <fcntl.h>
+# include <io.h>
+#endif
+
+#include "../bashintl.h"
+
#include "../shell.h"
#include "common.h"
#include "bashgetopt.h"
+#include "trap.h"
+
+#include <shtty.h>
#if defined (READLINE)
#include "../bashline.h"
#include <readline/readline.h>
#endif
-#define issep(c) (strchr (ifs_chars, (c)))
+#if defined (BUFFERED_INPUT)
+# include "input.h"
+#endif
+
+#include "shmbutil.h"
+#include "timer.h"
+
+#if !defined(errno)
+extern int errno;
+#endif
+
+struct ttsave
+{
+ int fd;
+ TTYSTRUCT attrs;
+};
+
+#if defined (READLINE)
+static void reset_attempted_completion_function PARAMS((char *));
+static int set_itext PARAMS((void));
+static char *edit_line PARAMS((char *, char *));
+static void set_eol_delim PARAMS((int));
+static void reset_eol_delim PARAMS((char *));
+static void set_readline_timeout PARAMS((sh_timer *t, time_t, long));
+#endif
+static SHELL_VAR *bind_read_variable PARAMS((char *, char *, int));
+#if defined (HANDLE_MULTIBYTE)
+static int read_mbchar PARAMS((int, char *, int, int, int));
+#endif
+static void ttyrestore PARAMS((struct ttsave *));
+
+static sighandler sigalrm PARAMS((int));
+static void reset_timeout PARAMS((void));
+
+/* Try this to see what the rest of the shell can do with the information. */
+sh_timer *read_timeout;
+
+static int reading, tty_modified;
+static SigHandler *old_alrm;
+static unsigned char delim;
+
+static struct ttsave termsave;
-extern int interrupt_immediately;
+/* In all cases, SIGALRM just sets a flag that we check periodically. This
+ avoids problems with the semi-tricky stuff we do with the xfree of
+ input_string at the top of the unwind-protect list (see below). */
+/* Set a flag that check_read_timeout can check. This relies on zread or
+ read_builtin calling trap.c:check_signals() (which calls check_read_timeout()) */
+static sighandler
+sigalrm (s)
+ int s;
+{
+ /* Display warning if this is called without read_timeout set? */
+ if (read_timeout)
+ read_timeout->alrmflag = 1;
+}
+
+static void
+reset_timeout ()
+{
+ /* Cancel alarm before restoring signal handler. */
+ if (read_timeout)
+ shtimer_clear (read_timeout);
#if defined (READLINE)
-static char *edit_line ();
+ rl_clear_timeout ();
#endif
-static SHELL_VAR *bind_read_variable ();
+ read_timeout = 0;
+}
+
+void
+check_read_timeout ()
+{
+ if (read_timeout && shtimer_chktimeout (read_timeout))
+ sh_longjmp (read_timeout->jmpenv, 1);
+}
+
+int
+read_builtin_timeout (fd)
+ int fd;
+{
+ if ((read_timeout == 0) ||
+ (read_timeout->fd != fd) ||
+ (read_timeout->tmout.tv_sec == 0 && read_timeout->tmout.tv_usec == 0))
+ return 0;
+
+ return ((read_timeout->flags & SHTIMER_ALARM) ? shtimer_alrm (read_timeout)
+ : shtimer_select (read_timeout));
+}
/* Read the value of the shell variables whose names follow.
The reading is done from the current input stream, whatever
WORD_LIST *list;
{
register char *varname;
- int size, i, raw, pass_next, saw_escape, eof, opt, retval, edit;
+ int size, nr, pass_next, saw_escape, eof, opt, retval, code, print_ps2, nflag;
+ volatile int i;
+ int input_is_tty, input_is_pipe, unbuffered_read, skip_ctlesc, skip_ctlnul;
+ int raw, edit, nchars, silent, have_timeout, ignore_delim, fd;
+ int lastsig, t_errno;
+ int mb_cur_max;
+ unsigned int tmsec, tmusec;
+ long ival, uval;
+ intmax_t intval;
char c;
char *input_string, *orig_input_string, *ifs_chars, *prompt, *arrayname;
- char *e, *t, *t1;
+ char *e, *t, *t1, *ps2, *tofree;
+ struct stat tsb;
SHELL_VAR *var;
+ TTYSTRUCT ttattrs, ttset;
+ sigset_t chldset, prevset;
#if defined (ARRAY_VARS)
WORD_LIST *alist;
+ int vflags;
#endif
+ int bindflags;
#if defined (READLINE)
- char *rlbuf;
+ char *rlbuf, *itext;
int rlind;
+ FILE *save_instream;
+#endif
+
+ USE_VAR(size);
+ USE_VAR(i);
+ USE_VAR(pass_next);
+ USE_VAR(print_ps2);
+ USE_VAR(saw_escape);
+ USE_VAR(input_is_pipe);
+/* USE_VAR(raw); */
+ USE_VAR(edit);
+ USE_VAR(tmsec);
+ USE_VAR(tmusec);
+ USE_VAR(nchars);
+ USE_VAR(silent);
+ USE_VAR(ifs_chars);
+ USE_VAR(prompt);
+ USE_VAR(arrayname);
+#if defined (READLINE)
+ USE_VAR(rlbuf);
+ USE_VAR(rlind);
+ USE_VAR(itext);
#endif
+ USE_VAR(list);
+ USE_VAR(ps2);
+ USE_VAR(lastsig);
+
+ reading = tty_modified = 0;
+ read_timeout = 0;
i = 0; /* Index into the string that we are reading. */
raw = edit = 0; /* Not reading raw input by default. */
+ silent = 0;
arrayname = prompt = (char *)NULL;
+ fd = 0; /* file descriptor to read from */
#if defined (READLINE)
- rlbuf = (char *)0;
+ rlbuf = itext = (char *)0;
rlind = 0;
#endif
+ mb_cur_max = MB_CUR_MAX;
+ tmsec = tmusec = 0; /* no timeout */
+ nr = nchars = input_is_tty = input_is_pipe = unbuffered_read = have_timeout = 0;
+ delim = '\n'; /* read until newline */
+ ignore_delim = nflag = 0;
+
reset_internal_getopt ();
- while ((opt = internal_getopt (list, "erp:a:")) != -1)
+ while ((opt = internal_getopt (list, "ersa:d:i:n:p:t:u:N:")) != -1)
{
switch (opt)
- {
- case 'r':
+ {
+ case 'r':
raw = 1;
break;
case 'p':
prompt = list_optarg;
break;
+ case 's':
+ silent = 1;
+ break;
case 'e':
#if defined (READLINE)
edit = 1;
+#endif
+ break;
+ case 'i':
+#if defined (READLINE)
+ itext = list_optarg;
#endif
break;
#if defined (ARRAY_VARS)
arrayname = list_optarg;
break;
#endif
+ case 't':
+ code = uconvert (list_optarg, &ival, &uval, (char **)NULL);
+ if (code == 0 || ival < 0 || uval < 0)
+ {
+ builtin_error (_("%s: invalid timeout specification"), list_optarg);
+ return (EXECUTION_FAILURE);
+ }
+ else
+ {
+ have_timeout = 1;
+ tmsec = ival;
+ tmusec = uval;
+ }
+ break;
+ case 'N':
+ ignore_delim = 1;
+ delim = -1;
+ case 'n':
+ nflag = 1;
+ code = legal_number (list_optarg, &intval);
+ if (code == 0 || intval < 0 || intval != (int)intval)
+ {
+ sh_invalidnum (list_optarg);
+ return (EXECUTION_FAILURE);
+ }
+ else
+ nchars = intval;
+ break;
+ case 'u':
+ code = legal_number (list_optarg, &intval);
+ if (code == 0 || intval < 0 || intval != (int)intval)
+ {
+ builtin_error (_("%s: invalid file descriptor specification"), list_optarg);
+ return (EXECUTION_FAILURE);
+ }
+ else
+ fd = intval;
+ if (sh_validfd (fd) == 0)
+ {
+ builtin_error (_("%d: invalid file descriptor: %s"), fd, strerror (errno));
+ return (EXECUTION_FAILURE);
+ }
+ break;
+ case 'd':
+ delim = *list_optarg;
+ break;
+ CASE_HELPOPT;
default:
builtin_usage ();
return (EX_USAGE);
}
list = loptend;
+ /* `read -t 0 var' tests whether input is available with select/FIONREAD,
+ and fails if those are unavailable */
+ if (have_timeout && tmsec == 0 && tmusec == 0)
+ return (input_avail (fd) ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
+
+ /* Convenience: check early whether or not the first of possibly several
+ variable names is a valid identifier, and bail early if so. */
+#if defined (ARRAY_VARS)
+ if (list)
+ SET_VFLAGS (list->word->flags, vflags, bindflags);
+ if (list && legal_identifier (list->word->word) == 0 && valid_array_reference (list->word->word, vflags) == 0)
+#else
+ bindflags = 0;
+ if (list && legal_identifier (list->word->word) == 0)
+#endif
+ {
+ sh_invalidid (list->word->word);
+ return (EXECUTION_FAILURE);
+ }
+
+ /* If we're asked to ignore the delimiter, make sure we do. */
+ if (ignore_delim)
+ delim = -1;
+
/* IF IFS is unset, we use the default of " \t\n". */
- var = find_variable ("IFS");
- ifs_chars = var ? value_cell (var) : " \t\n";
- if (ifs_chars == 0) /* XXX */
- ifs_chars = ""; /* XXX */
+ ifs_chars = getifs ();
+ if (ifs_chars == 0) /* XXX - shouldn't happen */
+ ifs_chars = "";
+ /* If we want to read exactly NCHARS chars, don't split on IFS */
+ if (ignore_delim)
+ ifs_chars = "";
+ for (skip_ctlesc = skip_ctlnul = 0, e = ifs_chars; *e; e++)
+ skip_ctlesc |= *e == CTLESC, skip_ctlnul |= *e == CTLNUL;
+
+ input_string = (char *)xmalloc (size = 112); /* XXX was 128 */
+ input_string[0] = '\0';
+
+ /* More input and options validation */
+ if (nflag == 1 && nchars == 0)
+ {
+ retval = read (fd, &c, 0);
+ retval = (retval >= 0) ? EXECUTION_SUCCESS : EXECUTION_FAILURE;
+ goto assign_vars; /* bail early if asked to read 0 chars */
+ }
+
+ /* $TMOUT, if set, is the default timeout for read. */
+ if (have_timeout == 0 && (e = get_string_value ("TMOUT")))
+ {
+ code = uconvert (e, &ival, &uval, (char **)NULL);
+ if (code == 0 || ival < 0 || uval < 0)
+ tmsec = tmusec = 0;
+ else
+ {
+ tmsec = ival;
+ tmusec = uval;
+ }
+ }
- input_string = xmalloc (size = 128);
+#if defined (SIGCHLD)
+ sigemptyset (&chldset);
+ sigprocmask (SIG_BLOCK, (sigset_t *)0, &chldset);
+ sigaddset (&chldset, SIGCHLD);
+#endif
begin_unwind_frame ("read_builtin");
- add_unwind_protect (xfree, input_string);
-#if defined (READLINE)
- add_unwind_protect (xfree, rlbuf);
+
+#if defined (BUFFERED_INPUT)
+ if (interactive == 0 && default_buffered_input >= 0 && fd_is_bash_input (fd))
+ sync_buffered_stream (default_buffered_input);
+#endif
+
+#if 1
+ input_is_tty = isatty (fd);
+#else
+ input_is_tty = 1;
+#endif
+ if (input_is_tty == 0)
+#ifndef __CYGWIN__
+ input_is_pipe = (lseek (fd, 0L, SEEK_CUR) < 0) && (errno == ESPIPE);
+#else
+ input_is_pipe = 1;
#endif
- interrupt_immediately++;
- /* If the -p or -e flags were given, but input is not coming from the
+ /* If the -p, -e or -s flags were given, but input is not coming from the
terminal, turn them off. */
- if ((prompt || edit) && (isatty (0) == 0))
+ if ((prompt || edit || silent) && input_is_tty == 0)
{
prompt = (char *)NULL;
- edit = 0;
+#if defined (READLINE)
+ itext = (char *)NULL;
+#endif
+ edit = silent = 0;
+ }
+
+#if defined (READLINE)
+ if (edit)
+ add_unwind_protect (xfree, rlbuf);
+#endif
+
+ pass_next = 0; /* Non-zero signifies last char was backslash. */
+ saw_escape = 0; /* Non-zero signifies that we saw an escape char */
+
+ if (tmsec > 0 || tmusec > 0)
+ {
+ /* Turn off the timeout if stdin is a regular file (e.g. from
+ input redirection). */
+ if ((fstat (fd, &tsb) < 0) || S_ISREG (tsb.st_mode))
+ tmsec = tmusec = 0;
+ }
+
+ if (tmsec > 0 || tmusec > 0)
+ {
+ read_timeout = shtimer_alloc ();
+ read_timeout->flags = SHTIMER_LONGJMP;
+
+#if defined (HAVE_SELECT)
+ read_timeout->flags |= (edit || posixly_correct) ? SHTIMER_ALARM : SHTIMER_SELECT;
+#else
+ read_timeout->flags |= SHTIMER_ALARM;
+#endif
+ read_timeout->fd = fd;
+
+ read_timeout->alrm_handler = sigalrm;
+ }
+
+ if (tmsec > 0 || tmusec > 0)
+ {
+ code = setjmp_nosigs (read_timeout->jmpenv);
+ if (code)
+ {
+ reset_timeout ();
+ sigprocmask (SIG_SETMASK, &prevset, (sigset_t *)0);
+
+ /* Tricky. The top of the unwind-protect stack is the free of
+ input_string. We want to run all the rest and use input_string,
+ so we have to save input_string temporarily, run the unwind-
+ protects, then restore input_string so we can use it later */
+ orig_input_string = 0;
+ input_string[i] = '\0'; /* make sure it's terminated */
+ if (i == 0)
+ {
+ t = (char *)xmalloc (1);
+ t[0] = 0;
+ }
+ else
+ t = savestring (input_string);
+
+ run_unwind_frame ("read_builtin");
+ input_string = t;
+ retval = 128+SIGALRM;
+ goto assign_vars;
+ }
+ if (interactive_shell == 0)
+ initialize_terminating_signals ();
+ add_unwind_protect (reset_timeout, (char *)NULL);
+#if defined (READLINE)
+ if (edit)
+ {
+ add_unwind_protect (reset_attempted_completion_function, (char *)NULL);
+ add_unwind_protect (bashline_reset_event_hook, (char *)NULL);
+ set_readline_timeout (read_timeout, tmsec, tmusec);
+ }
+ else
+#endif
+ shtimer_set (read_timeout, tmsec, tmusec);
+ }
+
+ /* If we've been asked to read only NCHARS chars, or we're using some
+ character other than newline to terminate the line, do the right
+ thing to readline or the tty. */
+ if (nchars > 0 || delim != '\n')
+ {
+#if defined (READLINE)
+ if (edit)
+ {
+ if (nchars > 0)
+ {
+ unwind_protect_int (rl_num_chars_to_read);
+ rl_num_chars_to_read = nchars;
+ }
+ if (delim != '\n')
+ {
+ set_eol_delim (delim);
+ add_unwind_protect (reset_eol_delim, (char *)NULL);
+ }
+ }
+ else
+#endif
+ if (input_is_tty)
+ {
+ /* ttsave() */
+ termsave.fd = fd;
+ ttgetattr (fd, &ttattrs);
+ termsave.attrs = ttattrs;
+
+ ttset = ttattrs;
+ i = silent ? ttfd_cbreak (fd, &ttset) : ttfd_onechar (fd, &ttset);
+ if (i < 0)
+ sh_ttyerror (1);
+ tty_modified = 1;
+ add_unwind_protect ((Function *)ttyrestore, (char *)&termsave);
+ if (interactive_shell == 0)
+ initialize_terminating_signals ();
+ }
+ }
+ else if (silent) /* turn off echo but leave term in canonical mode */
+ {
+ /* ttsave (); */
+ termsave.fd = fd;
+ ttgetattr (fd, &ttattrs);
+ termsave.attrs = ttattrs;
+
+ ttset = ttattrs;
+ i = ttfd_noecho (fd, &ttset); /* ttnoecho (); */
+ if (i < 0)
+ sh_ttyerror (1);
+
+ tty_modified = 1;
+ add_unwind_protect ((Function *)ttyrestore, (char *)&termsave);
+ if (interactive_shell == 0)
+ initialize_terminating_signals ();
+ }
+
+#if defined (READLINE)
+ save_instream = 0;
+ if (edit && fd != 0)
+ {
+ if (bash_readline_initialized == 0)
+ initialize_readline ();
+
+ unwind_protect_var (rl_instream);
+ save_instream = rl_instream;
+ rl_instream = fdopen (fd, "r");
}
+#endif
+
+ /* This *must* be the top unwind-protect on the stack, so the manipulation
+ of the unwind-protect stack after the realloc() works right. */
+ add_unwind_protect (xfree, input_string);
+ check_read_timeout ();
+ /* These only matter if edit == 0 */
+ if ((nchars > 0) && (input_is_tty == 0) && ignore_delim) /* read -N */
+ unbuffered_read = 2;
+#if 0
+ else if ((nchars > 0) || (delim != '\n') || input_is_pipe)
+#else
+ else if (((nchars > 0 || delim != '\n') && input_is_tty) || input_is_pipe)
+ unbuffered_read = 1;
+#endif
if (prompt && edit == 0)
{
fprintf (stderr, "%s", prompt);
fflush (stderr);
}
- pass_next = 0; /* Non-zero signifies last char was backslash. */
- saw_escape = 0; /* Non-zero signifies that we saw an escape char */
+#if defined (__CYGWIN__) && defined (O_TEXT)
+ setmode (0, O_TEXT);
+#endif
- for (eof = 0;;)
+ ps2 = 0;
+ for (print_ps2 = eof = retval = 0;;)
{
+ check_read_timeout ();
+
#if defined (READLINE)
if (edit)
{
- if (rlbuf && rlbuf[rlind] == '\0')
+ /* If we have a null delimiter, don't treat NULL as ending the line */
+ if (rlbuf && rlbuf[rlind] == '\0' && delim != '\0')
{
free (rlbuf);
rlbuf = (char *)0;
}
+#if defined (SIGCHLD)
+ if (tmsec > 0 || tmusec > 0)
+ sigprocmask (SIG_SETMASK, &chldset, &prevset);
+#endif
if (rlbuf == 0)
{
- rlbuf = edit_line (prompt ? prompt : "");
+ reading = 1;
+ rlbuf = edit_line (prompt ? prompt : "", itext);
+ reading = 0;
rlind = 0;
}
+#if defined (SIGCHLD)
+ if (tmsec > 0 || tmusec > 0)
+ sigprocmask (SIG_SETMASK, &prevset, (sigset_t *)0);
+#endif
if (rlbuf == 0)
{
eof = 1;
c = rlbuf[rlind++];
}
else
-#endif
- if (read (0, &c, 1) != 1)
{
+#endif
+
+ if (print_ps2)
+ {
+ if (ps2 == 0)
+ ps2 = get_string_value ("PS2");
+ fprintf (stderr, "%s", ps2 ? ps2 : "");
+ fflush (stderr);
+ print_ps2 = 0;
+ }
+
+ reading = 1;
+ check_read_timeout ();
+ errno = 0;
+
+#if defined (SIGCHLD)
+ if (tmsec > 0 || tmusec > 0)
+ sigprocmask (SIG_SETMASK, &chldset, &prevset);
+#endif
+ if (unbuffered_read == 2)
+ retval = posixly_correct ? zreadintr (fd, &c, 1) : zreadn (fd, &c, nchars - nr);
+ else if (unbuffered_read)
+ retval = posixly_correct ? zreadintr (fd, &c, 1) : zread (fd, &c, 1);
+ else
+ retval = posixly_correct ? zreadcintr (fd, &c) : zreadc (fd, &c);
+#if defined (SIGCHLD)
+ if (tmsec > 0 || tmusec > 0)
+ sigprocmask (SIG_SETMASK, &prevset, (sigset_t *)0);
+#endif
+
+ reading = 0;
+
+ if (retval <= 0)
+ {
+ int t;
+
+ t = errno;
+ if (retval < 0 && errno == EINTR)
+ {
+ check_signals (); /* in case we didn't call zread via zreadc */
+ lastsig = LASTSIG();
+ if (lastsig == 0)
+ lastsig = trapped_signal_received;
+#if 0
+ run_pending_traps (); /* because interrupt_immediately is not set */
+#endif
+ }
+ else
+ lastsig = 0;
+ if (terminating_signal && tty_modified)
+ ttyrestore (&termsave); /* fix terminal before exiting */
+ CHECK_TERMSIG;
eof = 1;
+ errno = t; /* preserve it for the error message below */
break;
}
- if (i + 2 >= size)
- input_string = xrealloc (input_string, size += 128);
+ QUIT; /* in case we didn't call check_signals() */
+#if defined (READLINE)
+ }
+#endif
+
+ if (retval <= 0) /* XXX shouldn't happen */
+ check_read_timeout ();
+
+ /* XXX -- use i + mb_cur_max (at least 4) for multibyte/read_mbchar */
+ if (i + (mb_cur_max > 4 ? mb_cur_max : 4) >= size)
+ {
+ char *t;
+ t = (char *)xrealloc (input_string, size += 128);
+
+ /* Only need to change unwind-protect if input_string changes */
+ if (t != input_string)
+ {
+ input_string = t;
+ remove_unwind_protect ();
+ add_unwind_protect (xfree, input_string);
+ }
+ }
/* If the next character is to be accepted verbatim, a backslash
newline pair still disappears from the input. */
if (pass_next)
{
+ pass_next = 0;
if (c == '\n')
- i--; /* back up over the CTLESC */
+ {
+ if (skip_ctlesc == 0 && i > 0)
+ i--; /* back up over the CTLESC */
+ if (interactive && input_is_tty && raw == 0)
+ print_ps2 = 1;
+ }
else
- input_string[i++] = c;
- pass_next = 0;
+ goto add_char;
continue;
}
+ /* This may cause problems if IFS contains CTLESC */
if (c == '\\' && raw == 0)
{
pass_next++;
- saw_escape++;
- input_string[i++] = CTLESC;
+ if (skip_ctlesc == 0)
+ {
+ saw_escape++;
+ input_string[i++] = CTLESC;
+ }
continue;
}
- if (c == '\n')
+ if (ignore_delim == 0 && (unsigned char)c == delim)
break;
- if (c == CTLESC || c == CTLNUL)
+ if (c == '\0' && delim != '\0')
+ continue; /* skip NUL bytes in input */
+
+ if ((skip_ctlesc == 0 && c == CTLESC) || (skip_ctlnul == 0 && c == CTLNUL))
{
saw_escape++;
input_string[i++] = CTLESC;
}
+add_char:
input_string[i++] = c;
+ check_read_timeout ();
+
+#if defined (HANDLE_MULTIBYTE)
+ /* XXX - what if C == 127? Can DEL introduce a multibyte sequence? */
+ if (mb_cur_max > 1 && is_basic (c) == 0)
+ {
+ input_string[i] = '\0'; /* for simplicity and debugging */
+ /* If we got input from readline, grab the next multibyte char from
+ rlbuf. */
+# if defined (READLINE)
+ if (edit)
+ {
+ size_t clen;
+ clen = mbrlen (rlbuf + rlind - 1, mb_cur_max, (mbstate_t *)NULL);
+ /* We only deal with valid multibyte sequences longer than one
+ byte. If we get anything else, we leave the one character
+ copied and move on to the next. */
+ if ((int)clen > 1)
+ {
+ memcpy (input_string+i, rlbuf+rlind, clen-1);
+ i += clen - 1;
+ rlind += clen - 1;
+ }
+ }
+ else
+# endif
+ if (locale_utf8locale == 0 || ((c & 0x80) != 0))
+ i += read_mbchar (fd, input_string, i, c, unbuffered_read);
+ }
+#endif
+
+ nr++;
+
+ if (nchars > 0 && nr >= nchars)
+ break;
}
input_string[i] = '\0';
+ check_read_timeout ();
+
+#if defined (READLINE)
+ if (edit)
+ free (rlbuf);
+#endif
+
+ if (retval < 0)
+ {
+ t_errno = errno;
+ if (errno != EINTR)
+ builtin_error (_("read error: %d: %s"), fd, strerror (errno));
+ run_unwind_frame ("read_builtin");
+ return ((t_errno != EINTR) ? EXECUTION_FAILURE : 128+lastsig);
+ }
+
+ if (tmsec > 0 || tmusec > 0)
+ reset_timeout ();
+
+ if (nchars > 0 || delim != '\n')
+ {
+#if defined (READLINE)
+ if (edit)
+ {
+ if (nchars > 0)
+ rl_num_chars_to_read = 0;
+ if (delim != '\n')
+ reset_eol_delim ((char *)NULL);
+ }
+ else
+#endif
+ if (input_is_tty)
+ ttyrestore (&termsave);
+ }
+ else if (silent)
+ ttyrestore (&termsave);
+
+ if (unbuffered_read == 0)
+ zsyncfd (fd);
+
+#if defined (READLINE)
+ if (save_instream)
+ rl_instream = save_instream; /* can't portably free it */
+#endif
- interrupt_immediately--;
discard_unwind_frame ("read_builtin");
retval = eof ? EXECUTION_FAILURE : EXECUTION_SUCCESS;
+assign_vars:
+
#if defined (ARRAY_VARS)
/* If -a was given, take the string read, break it into a list of words,
an assign them to `arrayname' in turn. */
if (arrayname)
{
- var = find_variable (arrayname);
+ /* pass 1 for flags arg to clear the existing array + 2 to check for a
+ valid identifier. */
+ var = builtin_find_indexed_array (arrayname, 3);
if (var == 0)
- var = make_new_array_variable (arrayname);
- else if (array_p (var) == 0)
- var = convert_var_to_array (var);
-
- empty_array (array_cell (var));
+ {
+ free (input_string);
+ return EXECUTION_FAILURE; /* readonly or noassign */
+ }
alist = list_string (input_string, ifs_chars, 0);
if (alist)
{
- assign_array_var_from_word_list (var, alist);
+ if (saw_escape)
+ dequote_list (alist);
+ else
+ word_list_remove_quoted_nulls (alist);
+ assign_array_var_from_word_list (var, alist, 0);
dispose_words (alist);
}
free (input_string);
}
#endif /* ARRAY_VARS */
- if (!list)
+ /* If there are no variables, save the text of the line read to the
+ variable $REPLY. ksh93 strips leading and trailing IFS whitespace,
+ so that `read x ; echo "$x"' and `read ; echo "$REPLY"' behave the
+ same way, but I believe that the difference in behaviors is useful
+ enough to not do it. Without the bash behavior, there is no way
+ to read a line completely without interpretation or modification
+ unless you mess with $IFS (e.g., setting it to the empty string).
+ If you disagree, change the occurrences of `#if 0' to `#if 1' below. */
+ if (list == 0)
{
+#if 0
+ orig_input_string = input_string;
+ for (t = input_string; ifs_chars && *ifs_chars && spctabnl(*t) && isifs(*t); t++)
+ ;
+ input_string = t;
+ input_string = strip_trailing_ifs_whitespace (input_string, ifs_chars, saw_escape);
+#endif
+
if (saw_escape)
{
t = dequote_string (input_string);
- var = bind_variable ("REPLY", t);
+ var = bind_variable ("REPLY", t, 0);
free (t);
}
else
- var = bind_variable ("REPLY", input_string);
- var->attributes &= ~att_invisible;
+ var = bind_variable ("REPLY", input_string, 0);
+ if (var == 0 || readonly_p (var) || noassign_p (var))
+ retval = EXECUTION_FAILURE;
+ else
+ VUNSETATTR (var, att_invisible);
+
free (input_string);
return (retval);
}
/* Remove IFS white space at the beginning of the input string. If
$IFS is null, no field splitting is performed. */
- for (t = input_string; ifs_chars && *ifs_chars && spctabnl(*t) && issep(*t); t++)
+ for (t = input_string; ifs_chars && *ifs_chars && spctabnl(*t) && isifs(*t); t++)
;
input_string = t;
-
for (; list->next; list = list->next)
{
varname = list->word->word;
#if defined (ARRAY_VARS)
- if (legal_identifier (varname) == 0 && valid_array_reference (varname) == 0)
+ SET_VFLAGS (list->word->flags, vflags, bindflags);
+ if (legal_identifier (varname) == 0 && valid_array_reference (varname, vflags) == 0)
#else
if (legal_identifier (varname) == 0)
#endif
{
- builtin_error ("`%s': not a valid identifier", varname);
+ sh_invalidid (varname);
free (orig_input_string);
return (EXECUTION_FAILURE);
}
if (t && saw_escape)
{
t1 = dequote_string (t);
- var = bind_read_variable (varname, t1);
+ var = bind_read_variable (varname, t1, bindflags);
free (t1);
}
else
- var = bind_read_variable (varname, t);
+ var = bind_read_variable (varname, t ? t : "", bindflags);
}
else
{
t = (char *)0;
- var = bind_read_variable (varname, "");
+ var = bind_read_variable (varname, "", bindflags);
}
FREE (t);
}
stupidly_hack_special_variables (varname);
- var->attributes &= ~att_invisible;
+ VUNSETATTR (var, att_invisible);
}
/* Now assign the rest of the line to the last variable argument. */
#if defined (ARRAY_VARS)
- if (legal_identifier (list->word->word) == 0 && valid_array_reference (list->word->word) == 0)
+ SET_VFLAGS (list->word->flags, vflags, bindflags);
+ if (legal_identifier (list->word->word) == 0 && valid_array_reference (list->word->word, vflags) == 0)
#else
if (legal_identifier (list->word->word) == 0)
#endif
{
- builtin_error ("`%s': not a valid identifier", list->word->word);
+ sh_invalidid (list->word->word);
free (orig_input_string);
return (EXECUTION_FAILURE);
}
+#if 0
/* This has to be done this way rather than using string_list
and list_string because Posix.2 says that the last variable gets the
remaining words and their intervening separators. */
input_string = strip_trailing_ifs_whitespace (input_string, ifs_chars, saw_escape);
+#else
+ /* Check whether or not the number of fields is exactly the same as the
+ number of variables. */
+ tofree = NULL;
+ if (*input_string)
+ {
+ t1 = input_string;
+ t = get_word_from_string (&input_string, ifs_chars, &e);
+ if (*input_string == 0)
+ tofree = input_string = t;
+ else
+ {
+ input_string = strip_trailing_ifs_whitespace (t1, ifs_chars, saw_escape);
+ tofree = t;
+ }
+ }
+#endif
- if (saw_escape)
+ if (saw_escape && input_string && *input_string)
{
t = dequote_string (input_string);
- var = bind_read_variable (list->word->word, t);
+ var = bind_read_variable (list->word->word, t, bindflags);
free (t);
}
else
- var = bind_read_variable (list->word->word, input_string);
- stupidly_hack_special_variables (list->word->word);
+ var = bind_read_variable (list->word->word, input_string ? input_string : "", bindflags);
+
if (var)
- var->attributes &= ~att_invisible;
+ {
+ stupidly_hack_special_variables (list->word->word);
+ VUNSETATTR (var, att_invisible);
+ }
+ else
+ retval = EXECUTION_FAILURE;
+
+ FREE (tofree);
free (orig_input_string);
return (retval);
}
static SHELL_VAR *
-bind_read_variable (name, value)
+bind_read_variable (name, value, flags)
char *name, *value;
+ int flags;
{
-#if defined (ARRAY_VARS)
- if (valid_array_reference (name) == 0)
+ SHELL_VAR *v;
+
+ v = builtin_bind_variable (name, value, flags);
+ return (v == 0 ? v
+ : ((readonly_p (v) || noassign_p (v)) ? (SHELL_VAR *)NULL : v));
+}
+
+#if defined (HANDLE_MULTIBYTE)
+static int
+read_mbchar (fd, string, ind, ch, unbuffered)
+ int fd;
+ char *string;
+ int ind, ch, unbuffered;
+{
+ char mbchar[MB_LEN_MAX + 1];
+ int i, n, r;
+ char c;
+ size_t ret;
+ mbstate_t ps, ps_back;
+ wchar_t wc;
+
+ memset (&ps, '\0', sizeof (mbstate_t));
+ memset (&ps_back, '\0', sizeof (mbstate_t));
+
+ mbchar[0] = ch;
+ i = 1;
+ for (n = 0; n <= MB_LEN_MAX; n++)
{
- if (legal_identifier (name) == 0)
- {
- builtin_error ("`%s': not a valid identifier", name);
- return ((SHELL_VAR *)NULL);
- }
- return (bind_variable (name, value));
+ ps_back = ps;
+ ret = mbrtowc (&wc, mbchar, i, &ps);
+ if (ret == (size_t)-2)
+ {
+ ps = ps_back;
+
+ /* We don't want to be interrupted during a multibyte char read */
+ if (unbuffered == 2)
+ r = zreadn (fd, &c, 1);
+ else if (unbuffered)
+ r = zread (fd, &c, 1);
+ else
+ r = zreadc (fd, &c);
+ if (r <= 0)
+ goto mbchar_return;
+ mbchar[i++] = c;
+ continue;
+ }
+ else if (ret == (size_t)-1 || ret == (size_t)0 || ret > (size_t)0)
+ break;
}
- else
- return (do_array_element_assignment (name, value));
-#else
- return bind_variable (name, value);
+
+mbchar_return:
+ if (i > 1) /* read a multibyte char */
+ /* mbchar[0] is already string[ind-1] */
+ for (r = 1; r < i; r++)
+ string[ind+r-1] = mbchar[r];
+ return i - 1;
+}
#endif
+
+
+static void
+ttyrestore (ttp)
+ struct ttsave *ttp;
+{
+ ttsetattr (ttp->fd, &(ttp->attrs));
+ tty_modified = 0;
+}
+
+void
+read_tty_cleanup ()
+{
+ if (tty_modified)
+ ttyrestore (&termsave);
+}
+
+int
+read_tty_modified ()
+{
+ return (tty_modified);
}
#if defined (READLINE)
+static rl_completion_func_t *old_attempted_completion_function = 0;
+static rl_hook_func_t *old_startup_hook;
+static char *deftext;
+
+static void
+reset_attempted_completion_function (cp)
+ char *cp;
+{
+ if (rl_attempted_completion_function == 0 && old_attempted_completion_function)
+ rl_attempted_completion_function = old_attempted_completion_function;
+}
+
+static int
+set_itext ()
+{
+ int r1, r2;
+
+ r1 = r2 = 0;
+ if (old_startup_hook)
+ r1 = (*old_startup_hook) ();
+ if (deftext)
+ {
+ r2 = rl_insert_text (deftext);
+ deftext = (char *)NULL;
+ rl_startup_hook = old_startup_hook;
+ old_startup_hook = (rl_hook_func_t *)NULL;
+ }
+ return (r1 || r2);
+}
+
static char *
-edit_line (p)
+edit_line (p, itext)
char *p;
+ char *itext;
{
char *ret;
int len;
- if (!bash_readline_initialized)
+ if (bash_readline_initialized == 0)
initialize_readline ();
+
+ old_attempted_completion_function = rl_attempted_completion_function;
+ rl_attempted_completion_function = (rl_completion_func_t *)NULL;
+ bashline_set_event_hook ();
+ if (itext)
+ {
+ old_startup_hook = rl_startup_hook;
+ rl_startup_hook = set_itext;
+ deftext = itext;
+ }
+
ret = readline (p);
+
+ rl_attempted_completion_function = old_attempted_completion_function;
+ old_attempted_completion_function = (rl_completion_func_t *)NULL;
+ bashline_reset_event_hook ();
+
if (ret == 0)
- return ret;
+ {
+ if (RL_ISSTATE (RL_STATE_TIMEOUT))
+ {
+ sigalrm (SIGALRM); /* simulate receiving SIGALRM */
+ check_read_timeout ();
+ }
+ return ret;
+ }
+
len = strlen (ret);
- ret = xrealloc (ret, len + 2);
- ret[len++] = '\n';
+ ret = (char *)xrealloc (ret, len + 2);
+ ret[len++] = delim;
ret[len] = '\0';
return ret;
}
+
+static void
+set_readline_timeout (t, sec, usec)
+ sh_timer *t;
+ time_t sec;
+ long usec;
+{
+ t->tmout.tv_sec = sec;
+ t->tmout.tv_usec = usec;
+ rl_set_timeout (sec, usec);
+}
+
+static int old_delim_ctype;
+static rl_command_func_t *old_delim_func;
+static int old_newline_ctype;
+static rl_command_func_t *old_newline_func;
+
+static unsigned char delim_char;
+
+static void
+set_eol_delim (c)
+ int c;
+{
+ Keymap cmap;
+
+ if (bash_readline_initialized == 0)
+ initialize_readline ();
+ cmap = rl_get_keymap ();
+
+ /* Save the old delimiter char binding */
+ old_newline_ctype = cmap[RETURN].type;
+ old_newline_func = cmap[RETURN].function;
+ old_delim_ctype = cmap[c].type;
+ old_delim_func = cmap[c].function;
+
+ /* Change newline to self-insert */
+ cmap[RETURN].type = ISFUNC;
+ cmap[RETURN].function = rl_insert;
+
+ /* Bind the delimiter character to accept-line. */
+ cmap[c].type = ISFUNC;
+ cmap[c].function = rl_newline;
+
+ delim_char = c;
+}
+
+static void
+reset_eol_delim (cp)
+ char *cp;
+{
+ Keymap cmap;
+
+ cmap = rl_get_keymap ();
+
+ cmap[RETURN].type = old_newline_ctype;
+ cmap[RETURN].function = old_newline_func;
+
+ cmap[delim_char].type = old_delim_ctype;
+ cmap[delim_char].function = old_delim_func;
+}
#endif
projects / thirdparty / bash.git / blobdiff