412 lines
10 KiB
C
412 lines
10 KiB
C
/* histfile.c - functions to manipulate the history file. */
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/* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
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This file contains the GNU History Library (the Library), a set of
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routines for managing the text of previously typed lines.
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The Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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The Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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675 Mass Ave, Cambridge, MA 02139, USA. */
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/* The goal is to make the implementation transparent, so that you
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don't have to know what data types are used, just what functions
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you can call. I think I have done that. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#ifndef _MINIX
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# include <sys/file.h>
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#endif
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#include <sys/stat.h>
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#include <fcntl.h>
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#if defined (HAVE_STRING_H)
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# include <string.h>
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#else
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# include <strings.h>
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#endif /* !HAVE_STRING_H */
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#if defined (__EMX__)
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# ifndef O_BINARY
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# define O_BINARY 0
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# endif
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#else /* !__EMX__ */
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/* If we're not compiling for __EMX__, we don't want this at all. Ever. */
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# undef O_BINARY
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# define O_BINARY 0
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#endif /* !__EMX__ */
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#include <errno.h>
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#if !defined (errno)
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extern int errno;
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#endif /* !errno */
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#include "history.h"
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#include "histlib.h"
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/* Functions imported from shell.c */
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extern char *get_env_value ();
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extern char *xmalloc (), *xrealloc ();
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/* Return the string that should be used in the place of this
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filename. This only matters when you don't specify the
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filename to read_history (), or write_history (). */
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static char *
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history_filename (filename)
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char *filename;
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{
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char *return_val, *home;
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int home_len;
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return_val = filename ? savestring (filename) : (char *)NULL;
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if (return_val)
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return (return_val);
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home = get_env_value ("HOME");
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if (home == 0)
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{
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home = ".";
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home_len = 1;
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}
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else
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home_len = strlen (home);
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return_val = xmalloc (2 + home_len + 8); /* strlen(".history") == 8 */
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strcpy (return_val, home);
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return_val[home_len] = '/';
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strcpy (return_val + home_len + 1, ".history");
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return (return_val);
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}
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/* Add the contents of FILENAME to the history list, a line at a time.
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If FILENAME is NULL, then read from ~/.history. Returns 0 if
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successful, or errno if not. */
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int
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read_history (filename)
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char *filename;
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{
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return (read_history_range (filename, 0, -1));
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}
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/* Read a range of lines from FILENAME, adding them to the history list.
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Start reading at the FROM'th line and end at the TO'th. If FROM
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is zero, start at the beginning. If TO is less than FROM, read
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until the end of the file. If FILENAME is NULL, then read from
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~/.history. Returns 0 if successful, or errno if not. */
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int
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read_history_range (filename, from, to)
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char *filename;
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int from, to;
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{
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register int line_start, line_end;
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char *input, *buffer;
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int file, current_line;
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struct stat finfo;
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size_t file_size;
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buffer = (char *)NULL;
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input = history_filename (filename);
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file = open (input, O_RDONLY|O_BINARY, 0666);
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#ifdef __MSDOS__
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/* MSDOS doesn't allow leading dots in file names. Try again
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with the dot replaced by an underscore. */
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if (file < 0 && !filename)
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{
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input[strlen (input) - 8] = '_';
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file = open (input, O_RDONLY|O_BINARY, 0666);
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}
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#endif
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if ((file < 0) || (fstat (file, &finfo) == -1))
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goto error_and_exit;
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file_size = (size_t)finfo.st_size;
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/* check for overflow on very large files */
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if (file_size != finfo.st_size || file_size + 1 < file_size)
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{
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#if defined (EFBIG)
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errno = EFBIG;
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#endif
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goto error_and_exit;
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}
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buffer = xmalloc (file_size + 1);
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#if 0
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if (read (file, buffer, file_size) != file_size)
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#else
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if (read (file, buffer, file_size) < 0)
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#endif
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{
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error_and_exit:
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if (file >= 0)
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close (file);
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FREE (input);
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FREE (buffer);
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return (errno);
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}
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close (file);
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/* Set TO to larger than end of file if negative. */
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if (to < 0)
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to = file_size;
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/* Start at beginning of file, work to end. */
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line_start = line_end = current_line = 0;
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/* Skip lines until we are at FROM. */
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while (line_start < file_size && current_line < from)
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{
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for (line_end = line_start; line_end < file_size; line_end++)
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if (buffer[line_end] == '\n')
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{
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current_line++;
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line_start = line_end + 1;
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if (current_line == from)
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break;
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}
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}
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/* If there are lines left to gobble, then gobble them now. */
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for (line_end = line_start; line_end < file_size; line_end++)
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if (buffer[line_end] == '\n')
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{
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buffer[line_end] = '\0';
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if (buffer[line_start])
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add_history (buffer + line_start);
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current_line++;
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if (current_line >= to)
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break;
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line_start = line_end + 1;
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}
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FREE (input);
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FREE (buffer);
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return (0);
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}
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/* Truncate the history file FNAME, leaving only LINES trailing lines.
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If FNAME is NULL, then use ~/.history. */
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int
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history_truncate_file (fname, lines)
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char *fname;
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int lines;
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{
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register int i;
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int file, chars_read;
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char *buffer, *filename;
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struct stat finfo;
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size_t file_size;
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buffer = (char *)NULL;
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filename = history_filename (fname);
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file = open (filename, O_RDONLY|O_BINARY, 0666);
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#ifdef __MSDOS__
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/* MSDOS doesn't allow leading dots in file names. Try again
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with the dot replaced by an underscore. */
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if (file < 0 && !fname)
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{
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filename[strlen (filename) - 8] = '_';
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file = open (filename, O_RDONLY|O_BINARY, 0666);
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}
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#endif
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if (file == -1 || fstat (file, &finfo) == -1)
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goto truncate_exit;
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file_size = (size_t)finfo.st_size;
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/* check for overflow on very large files */
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if (file_size != finfo.st_size || file_size + 1 < file_size)
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{
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close (file);
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#if defined (EFBIG)
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errno = EFBIG;
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#endif
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goto truncate_exit;
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}
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buffer = xmalloc (file_size + 1);
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chars_read = read (file, buffer, file_size);
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close (file);
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if (chars_read <= 0)
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goto truncate_exit;
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/* Count backwards from the end of buffer until we have passed
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LINES lines. */
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for (i = chars_read - 1; lines && i; i--)
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{
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if (buffer[i] == '\n')
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lines--;
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}
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/* If this is the first line, then the file contains exactly the
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number of lines we want to truncate to, so we don't need to do
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anything. It's the first line if we don't find a newline between
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the current value of i and 0. Otherwise, write from the start of
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this line until the end of the buffer. */
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for ( ; i; i--)
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if (buffer[i] == '\n')
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{
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i++;
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break;
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}
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/* Write only if there are more lines in the file than we want to
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truncate to. */
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if (i && ((file = open (filename, O_WRONLY|O_TRUNC|O_BINARY, 0600)) != -1))
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{
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write (file, buffer + i, file_size - i);
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#if defined (__BEOS__)
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/* BeOS ignores O_TRUNC. */
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ftruncate (file, file_size - i);
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#endif
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close (file);
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}
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truncate_exit:
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FREE (buffer);
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free (filename);
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return 0;
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}
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/* Workhorse function for writing history. Writes NELEMENT entries
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from the history list to FILENAME. OVERWRITE is non-zero if you
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wish to replace FILENAME with the entries. */
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static int
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history_do_write (filename, nelements, overwrite)
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char *filename;
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int nelements, overwrite;
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{
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register int i;
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char *output;
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int file, mode;
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mode = overwrite ? O_WRONLY|O_CREAT|O_TRUNC|O_BINARY : O_WRONLY|O_APPEND|O_BINARY;
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output = history_filename (filename);
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if ((file = open (output, mode, 0600)) == -1)
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{
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#ifdef __MSDOS__
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/* MSDOS doesn't allow leading dots in file names. If this is
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the default file name, try again with the dot replaced by an
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underscore. */
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if (!filename)
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{
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output[strlen (output) - 8] = '_';
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if ((file = open (output, mode, 0600)) == -1)
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{
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FREE (output);
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return (errno);
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}
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}
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#else
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FREE (output);
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return (errno);
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#endif
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}
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if (nelements > history_length)
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nelements = history_length;
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/* Build a buffer of all the lines to write, and write them in one syscall.
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Suggested by Peter Ho (peter@robosts.oxford.ac.uk). */
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{
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HIST_ENTRY **the_history; /* local */
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register int j;
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int buffer_size;
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char *buffer;
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the_history = history_list ();
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/* Calculate the total number of bytes to write. */
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for (buffer_size = 0, i = history_length - nelements; i < history_length; i++)
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buffer_size += 1 + strlen (the_history[i]->line);
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/* Allocate the buffer, and fill it. */
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buffer = xmalloc (buffer_size);
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for (j = 0, i = history_length - nelements; i < history_length; i++)
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{
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strcpy (buffer + j, the_history[i]->line);
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j += strlen (the_history[i]->line);
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buffer[j++] = '\n';
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}
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write (file, buffer, buffer_size);
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free (buffer);
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}
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close (file);
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FREE (output);
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return (0);
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}
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/* Append NELEMENT entries to FILENAME. The entries appended are from
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the end of the list minus NELEMENTs up to the end of the list. */
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int
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append_history (nelements, filename)
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int nelements;
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char *filename;
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{
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return (history_do_write (filename, nelements, HISTORY_APPEND));
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}
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/* Overwrite FILENAME with the current history. If FILENAME is NULL,
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then write the history list to ~/.history. Values returned
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are as in read_history ().*/
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int
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write_history (filename)
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char *filename;
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{
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return (history_do_write (filename, history_length, HISTORY_OVERWRITE));
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}
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