old-cross-binutils/readline/histfile.c
Jan Kratochvil cc88a640ca Imported readline 6.2, and upstream patch 001.
[patch 0/3] readline-6.2 rebase
http://sourceware.org/ml/gdb-patches/2011-05/msg00003.html
[patch 1/3] readline-6.2: Merge of already posted patches
http://sourceware.org/ml/gdb-patches/2011-05/msg00004.html
	=
	[Bug-readline] [RFC/readline] bind.c, rl_function_dumper, Free allocated
	http://lists.gnu.org/archive/html/bug-readline/2011-03/msg00000.html
	[Bug-readline] [patch] Fix underquotation in readline/examples/rlfe/conf
	http://lists.gnu.org/archive/html/bug-readline/2011-04/msg00001.html
	[Bug-readline] [patch] Makefile.in htm<->html
	http://lists.gnu.org/archive/html/bug-readline/2011-04/msg00002.html
	Re: [Bug-readline] [patch] Makefile.in dependency: callback.o: xmalloc.h
	http://lists.gnu.org/archive/html/bug-readline/2011-04/msg00004.html
	[Bug-readline] [patch] Remove . from the VPATH directive
	http://lists.gnu.org/archive/html/bug-readline/2011-04/msg00005.html
	Eli Zaretskii's __MSDOS__ / __GO32__ / __MINGW32__ / __DJGPP__ stuff:
	http://sourceware.org/ml/gdb/2011-04/msg00002.html
	Jan Kratochvil's patch for FSF GDB tree local-specific changes:
	http://sourceware.org/ml/gdb/2011-04/msg00006.html
	Preservation of existing ChangeLog.gdb files, their updates.
[patch 2/3] readline-6.2: Workaround "ask" regression
http://sourceware.org/ml/gdb-patches/2011-05/msg00005.html
[patch 3/3] readline-6.2: Revert 5.x compat., apply 6.x compat.
http://sourceware.org/ml/gdb-patches/2011-05/msg00006.html
[patch 4/3] readline-6.2: Substitute inc-hist.texinfo
http://sourceware.org/ml/gdb-patches/2011-05/msg00010.html

readline/
	Workaround gdb.base/completion.exp regression on readline-6.2.
	* complete.c (get_y_or_n): Disable the return on RL_STATE_CALLBACK.

	Imported readline 6.2, and upstream patch 001.
	* configure: Regenerate.

readline/doc/
	* hsuser.texi (Using History Interactively): Disable !BashFeatures
	@defcodeindex.  Make the `Programming with GNU History' reference
	external.
	* inc-hist.texinfo: Remove.

	Imported readline 6.2, and upstream patch 001.

readline/examples/
	Imported readline 6.2, and upstream patch 001.

readline/examples/rlfe/
	Imported readline 6.2, and upstream patch 001.

gdb/
	* config.in: Regenerate.
	* configure: Regenerate.
	* configure.ac <--with-system-readline> (for readline_echoing_p):
	Remove the test.
	* tui/tui-io.c (tui_old_readline_echoing_p): Rename to ...
	(tui_old_rl_echoing_p): ... here.
	(tui_setup_io): Rename extern declaration readline_echoing_p to
	_rl_echoing_p.  Adjust assignments for the both renames.

gdb/doc/
	* Makefile.in (GDB_DOC_SOURCE_INCLUDES): Rename inc-hist.texinfo to
	hsuser.texi.
	* gdb.texinfo <!SYSTEM_READLINE>: Rename inc-hist.texinfo inclusion and
	comment to hsuser.texi.  Change rluser.texi name in the comment.
2011-05-11 23:38:44 +00:00

552 lines
14 KiB
C

/* histfile.c - functions to manipulate the history file. */
/* Copyright (C) 1989-2010 Free Software Foundation, Inc.
This file contains the GNU History Library (History), a set of
routines for managing the text of previously typed lines.
History 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.
History 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 History. If not, see <http://www.gnu.org/licenses/>.
*/
/* The goal is to make the implementation transparent, so that you
don't have to know what data types are used, just what functions
you can call. I think I have done that. */
#define READLINE_LIBRARY
#if defined (__TANDEM)
# include <floss.h>
#endif
#if defined (HAVE_CONFIG_H)
# include <config.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#if ! defined (_MINIX) && defined (HAVE_SYS_FILE_H)
# include <sys/file.h>
#endif
#include "posixstat.h"
#include <fcntl.h>
#if defined (HAVE_STDLIB_H)
# include <stdlib.h>
#else
# include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <ctype.h>
#if defined (__EMX__)
# undef HAVE_MMAP
#endif
#ifdef HISTORY_USE_MMAP
# include <sys/mman.h>
# ifdef MAP_FILE
# define MAP_RFLAGS (MAP_FILE|MAP_PRIVATE)
# define MAP_WFLAGS (MAP_FILE|MAP_SHARED)
# else
# define MAP_RFLAGS MAP_PRIVATE
# define MAP_WFLAGS MAP_SHARED
# endif
# ifndef MAP_FAILED
# define MAP_FAILED ((void *)-1)
# endif
#endif /* HISTORY_USE_MMAP */
/* If we're compiling for __EMX__ (OS/2) or __CYGWIN__ (cygwin32 environment
on win 95/98/nt), we want to open files with O_BINARY mode so that there
is no \n -> \r\n conversion performed. On other systems, we don't want to
mess around with O_BINARY at all, so we ensure that it's defined to 0. */
#if defined (__EMX__) || defined (__CYGWIN__)
# ifndef O_BINARY
# define O_BINARY 0
# endif
#else /* !__EMX__ && !__CYGWIN__ */
# undef O_BINARY
# define O_BINARY 0
#endif /* !__EMX__ && !__CYGWIN__ */
#include <errno.h>
#if !defined (errno)
extern int errno;
#endif /* !errno */
#include "history.h"
#include "histlib.h"
#include "rlshell.h"
#include "xmalloc.h"
/* If non-zero, we write timestamps to the history file in history_do_write() */
int history_write_timestamps = 0;
/* Does S look like the beginning of a history timestamp entry? Placeholder
for more extensive tests. */
#define HIST_TIMESTAMP_START(s) (*(s) == history_comment_char && isdigit ((s)[1]) )
/* Return the string that should be used in the place of this
filename. This only matters when you don't specify the
filename to read_history (), or write_history (). */
static char *
history_filename (filename)
const char *filename;
{
char *return_val;
const char *home;
int home_len;
return_val = filename ? savestring (filename) : (char *)NULL;
if (return_val)
return (return_val);
home = sh_get_env_value ("HOME");
if (home == 0)
{
#if 0
home = ".";
home_len = 1;
#else
return (NULL);
#endif
}
else
home_len = strlen (home);
return_val = (char *)xmalloc (2 + home_len + 8); /* strlen(".history") == 8 */
strcpy (return_val, home);
return_val[home_len] = '/';
#if defined (__MSDOS__)
strcpy (return_val + home_len + 1, "_history");
#else
strcpy (return_val + home_len + 1, ".history");
#endif
return (return_val);
}
/* Add the contents of FILENAME to the history list, a line at a time.
If FILENAME is NULL, then read from ~/.history. Returns 0 if
successful, or errno if not. */
int
read_history (filename)
const char *filename;
{
return (read_history_range (filename, 0, -1));
}
/* Read a range of lines from FILENAME, adding them to the history list.
Start reading at the FROM'th line and end at the TO'th. If FROM
is zero, start at the beginning. If TO is less than FROM, read
until the end of the file. If FILENAME is NULL, then read from
~/.history. Returns 0 if successful, or errno if not. */
int
read_history_range (filename, from, to)
const char *filename;
int from, to;
{
register char *line_start, *line_end, *p;
char *input, *buffer, *bufend, *last_ts;
int file, current_line, chars_read;
struct stat finfo;
size_t file_size;
#if defined (EFBIG)
int overflow_errno = EFBIG;
#elif defined (EOVERFLOW)
int overflow_errno = EOVERFLOW;
#else
int overflow_errno = EIO;
#endif
buffer = last_ts = (char *)NULL;
input = history_filename (filename);
file = input ? open (input, O_RDONLY|O_BINARY, 0666) : -1;
if ((file < 0) || (fstat (file, &finfo) == -1))
goto error_and_exit;
file_size = (size_t)finfo.st_size;
/* check for overflow on very large files */
if (file_size != finfo.st_size || file_size + 1 < file_size)
{
errno = overflow_errno;
goto error_and_exit;
}
#ifdef HISTORY_USE_MMAP
/* We map read/write and private so we can change newlines to NULs without
affecting the underlying object. */
buffer = (char *)mmap (0, file_size, PROT_READ|PROT_WRITE, MAP_RFLAGS, file, 0);
if ((void *)buffer == MAP_FAILED)
{
errno = overflow_errno;
goto error_and_exit;
}
chars_read = file_size;
#else
buffer = (char *)malloc (file_size + 1);
if (buffer == 0)
{
errno = overflow_errno;
goto error_and_exit;
}
chars_read = read (file, buffer, file_size);
#endif
if (chars_read < 0)
{
error_and_exit:
if (errno != 0)
chars_read = errno;
else
chars_read = EIO;
if (file >= 0)
close (file);
FREE (input);
#ifndef HISTORY_USE_MMAP
FREE (buffer);
#endif
return (chars_read);
}
close (file);
/* Set TO to larger than end of file if negative. */
if (to < 0)
to = chars_read;
/* Start at beginning of file, work to end. */
bufend = buffer + chars_read;
current_line = 0;
/* Skip lines until we are at FROM. */
for (line_start = line_end = buffer; line_end < bufend && current_line < from; line_end++)
if (*line_end == '\n')
{
p = line_end + 1;
/* If we see something we think is a timestamp, continue with this
line. We should check more extensively here... */
if (HIST_TIMESTAMP_START(p) == 0)
current_line++;
line_start = p;
}
/* If there are lines left to gobble, then gobble them now. */
for (line_end = line_start; line_end < bufend; line_end++)
if (*line_end == '\n')
{
/* Change to allow Windows-like \r\n end of line delimiter. */
if (line_end > line_start && line_end[-1] == '\r')
line_end[-1] = '\0';
else
*line_end = '\0';
if (*line_start)
{
if (HIST_TIMESTAMP_START(line_start) == 0)
{
add_history (line_start);
if (last_ts)
{
add_history_time (last_ts);
last_ts = NULL;
}
}
else
{
last_ts = line_start;
current_line--;
}
}
current_line++;
if (current_line >= to)
break;
line_start = line_end + 1;
}
FREE (input);
#ifndef HISTORY_USE_MMAP
FREE (buffer);
#else
munmap (buffer, file_size);
#endif
return (0);
}
/* Truncate the history file FNAME, leaving only LINES trailing lines.
If FNAME is NULL, then use ~/.history. Returns 0 on success, errno
on failure. */
int
history_truncate_file (fname, lines)
const char *fname;
int lines;
{
char *buffer, *filename, *bp, *bp1; /* bp1 == bp+1 */
int file, chars_read, rv;
struct stat finfo;
size_t file_size;
buffer = (char *)NULL;
filename = history_filename (fname);
file = filename ? open (filename, O_RDONLY|O_BINARY, 0666) : -1;
rv = 0;
/* Don't try to truncate non-regular files. */
if (file == -1 || fstat (file, &finfo) == -1)
{
rv = errno;
if (file != -1)
close (file);
goto truncate_exit;
}
if (S_ISREG (finfo.st_mode) == 0)
{
close (file);
#ifdef EFTYPE
rv = EFTYPE;
#else
rv = EINVAL;
#endif
goto truncate_exit;
}
file_size = (size_t)finfo.st_size;
/* check for overflow on very large files */
if (file_size != finfo.st_size || file_size + 1 < file_size)
{
close (file);
#if defined (EFBIG)
rv = errno = EFBIG;
#elif defined (EOVERFLOW)
rv = errno = EOVERFLOW;
#else
rv = errno = EINVAL;
#endif
goto truncate_exit;
}
buffer = (char *)malloc (file_size + 1);
if (buffer == 0)
{
close (file);
goto truncate_exit;
}
chars_read = read (file, buffer, file_size);
close (file);
if (chars_read <= 0)
{
rv = (chars_read < 0) ? errno : 0;
goto truncate_exit;
}
/* Count backwards from the end of buffer until we have passed
LINES lines. bp1 is set funny initially. But since bp[1] can't
be a comment character (since it's off the end) and *bp can't be
both a newline and the history comment character, it should be OK. */
for (bp1 = bp = buffer + chars_read - 1; lines && bp > buffer; bp--)
{
if (*bp == '\n' && HIST_TIMESTAMP_START(bp1) == 0)
lines--;
bp1 = bp;
}
/* If this is the first line, then the file contains exactly the
number of lines we want to truncate to, so we don't need to do
anything. It's the first line if we don't find a newline between
the current value of i and 0. Otherwise, write from the start of
this line until the end of the buffer. */
for ( ; bp > buffer; bp--)
{
if (*bp == '\n' && HIST_TIMESTAMP_START(bp1) == 0)
{
bp++;
break;
}
bp1 = bp;
}
/* Write only if there are more lines in the file than we want to
truncate to. */
if (bp > buffer && ((file = open (filename, O_WRONLY|O_TRUNC|O_BINARY, 0600)) != -1))
{
write (file, bp, chars_read - (bp - buffer));
#if defined (__BEOS__)
/* BeOS ignores O_TRUNC. */
ftruncate (file, chars_read - (bp - buffer));
#endif
close (file);
}
truncate_exit:
FREE (buffer);
xfree (filename);
return rv;
}
/* Workhorse function for writing history. Writes NELEMENT entries
from the history list to FILENAME. OVERWRITE is non-zero if you
wish to replace FILENAME with the entries. */
static int
history_do_write (filename, nelements, overwrite)
const char *filename;
int nelements, overwrite;
{
register int i;
char *output;
int file, mode, rv;
#ifdef HISTORY_USE_MMAP
size_t cursize;
mode = overwrite ? O_RDWR|O_CREAT|O_TRUNC|O_BINARY : O_RDWR|O_APPEND|O_BINARY;
#else
mode = overwrite ? O_WRONLY|O_CREAT|O_TRUNC|O_BINARY : O_WRONLY|O_APPEND|O_BINARY;
#endif
output = history_filename (filename);
file = output ? open (output, mode, 0600) : -1;
rv = 0;
if (file == -1)
{
FREE (output);
return (errno);
}
#ifdef HISTORY_USE_MMAP
cursize = overwrite ? 0 : lseek (file, 0, SEEK_END);
#endif
if (nelements > history_length)
nelements = history_length;
/* Build a buffer of all the lines to write, and write them in one syscall.
Suggested by Peter Ho (peter@robosts.oxford.ac.uk). */
{
HIST_ENTRY **the_history; /* local */
register int j;
int buffer_size;
char *buffer;
the_history = history_list ();
/* Calculate the total number of bytes to write. */
for (buffer_size = 0, i = history_length - nelements; i < history_length; i++)
#if 0
buffer_size += 2 + HISTENT_BYTES (the_history[i]);
#else
{
if (history_write_timestamps && the_history[i]->timestamp && the_history[i]->timestamp[0])
buffer_size += strlen (the_history[i]->timestamp) + 1;
buffer_size += strlen (the_history[i]->line) + 1;
}
#endif
/* Allocate the buffer, and fill it. */
#ifdef HISTORY_USE_MMAP
if (ftruncate (file, buffer_size+cursize) == -1)
goto mmap_error;
buffer = (char *)mmap (0, buffer_size, PROT_READ|PROT_WRITE, MAP_WFLAGS, file, cursize);
if ((void *)buffer == MAP_FAILED)
{
mmap_error:
rv = errno;
FREE (output);
close (file);
return rv;
}
#else
buffer = (char *)malloc (buffer_size);
if (buffer == 0)
{
rv = errno;
FREE (output);
close (file);
return rv;
}
#endif
for (j = 0, i = history_length - nelements; i < history_length; i++)
{
if (history_write_timestamps && the_history[i]->timestamp && the_history[i]->timestamp[0])
{
strcpy (buffer + j, the_history[i]->timestamp);
j += strlen (the_history[i]->timestamp);
buffer[j++] = '\n';
}
strcpy (buffer + j, the_history[i]->line);
j += strlen (the_history[i]->line);
buffer[j++] = '\n';
}
#ifdef HISTORY_USE_MMAP
if (msync (buffer, buffer_size, 0) != 0 || munmap (buffer, buffer_size) != 0)
rv = errno;
#else
if (write (file, buffer, buffer_size) < 0)
rv = errno;
xfree (buffer);
#endif
}
close (file);
FREE (output);
return (rv);
}
/* Append NELEMENT entries to FILENAME. The entries appended are from
the end of the list minus NELEMENTs up to the end of the list. */
int
append_history (nelements, filename)
int nelements;
const char *filename;
{
return (history_do_write (filename, nelements, HISTORY_APPEND));
}
/* Overwrite FILENAME with the current history. If FILENAME is NULL,
then write the history list to ~/.history. Values returned
are as in read_history ().*/
int
write_history (filename)
const char *filename;
{
return (history_do_write (filename, history_length, HISTORY_OVERWRITE));
}