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-rw-r--r--readline-4.3/histfile.c479
1 files changed, 0 insertions, 479 deletions
diff --git a/readline-4.3/histfile.c b/readline-4.3/histfile.c
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index 60a9125..0000000
--- a/readline-4.3/histfile.c
+++ /dev/null
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-/* histfile.c - functions to manipulate the history file. */
-
-/* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
-
- This file contains the GNU History Library (the Library), a set of
- routines for managing the text of previously typed lines.
-
- The Library 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 2, or (at your option)
- any later version.
-
- The Library 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.
-
- The GNU General Public License is often shipped with GNU software, and
- is generally kept in a file called COPYING or LICENSE. If you do not
- have a copy of the license, write to the Free Software Foundation,
- 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
-
-/* 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 (HAVE_CONFIG_H)
-# include <config.h>
-#endif
-
-#include <stdio.h>
-
-#include <sys/types.h>
-#ifndef _MINIX
-# 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
-
-#if defined (__EMX__) || defined (__CYGWIN__)
-# undef HAVE_MMAP
-#endif
-
-#ifdef HAVE_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 /* HAVE_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"
-
-/* 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)
- {
- home = ".";
- home_len = 1;
- }
- 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;
- char *input, *buffer, *bufend;
- int file, current_line, chars_read;
- struct stat finfo;
- size_t file_size;
-
- buffer = (char *)NULL;
- input = history_filename (filename);
- file = open (input, O_RDONLY|O_BINARY, 0666);
-
- 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)
- {
-#if defined (EFBIG)
- errno = EFBIG;
-#elif defined (EOVERFLOW)
- errno = EOVERFLOW;
-#endif
- goto error_and_exit;
- }
-
-#ifdef HAVE_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)
- goto error_and_exit;
- chars_read = file_size;
-#else
- buffer = (char *)malloc (file_size + 1);
- if (buffer == 0)
- goto error_and_exit;
-
- chars_read = read (file, buffer, file_size);
-#endif
- if (chars_read < 0)
- {
- error_and_exit:
- chars_read = errno;
- if (file >= 0)
- close (file);
-
- FREE (input);
-#ifndef HAVE_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')
- {
- current_line++;
- line_start = line_end + 1;
- }
-
- /* 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')
- {
- *line_end = '\0';
-
- if (*line_start)
- add_history (line_start);
-
- current_line++;
-
- if (current_line >= to)
- break;
-
- line_start = line_end + 1;
- }
-
- FREE (input);
-#ifndef HAVE_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;
- int file, chars_read, rv;
- struct stat finfo;
- size_t file_size;
-
- buffer = (char *)NULL;
- filename = history_filename (fname);
- file = open (filename, O_RDONLY|O_BINARY, 0666);
- 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. */
- for (bp = buffer + chars_read - 1; lines && bp > buffer; bp--)
- {
- if (*bp == '\n')
- lines--;
- }
-
- /* 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')
- {
- bp++;
- break;
- }
-
- /* 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);
-
- free (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;
- size_t cursize;
-
-#ifdef HAVE_MMAP
- 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);
- rv = 0;
-
- if ((file = open (output, mode, 0600)) == -1)
- {
- FREE (output);
- return (errno);
- }
-
-#ifdef HAVE_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++)
- buffer_size += 1 + strlen (the_history[i]->line);
-
- /* Allocate the buffer, and fill it. */
-#ifdef HAVE_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++)
- {
- strcpy (buffer + j, the_history[i]->line);
- j += strlen (the_history[i]->line);
- buffer[j++] = '\n';
- }
-
-#ifdef HAVE_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;
- free (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));
-}
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