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corestack/ readline-5.0/ histfile.c [1.6]

 /* histfile.c - functions to manipulate the history file. */
 
 /* Copyright (C) 1989-2003 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 (__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
 
 #if defined (__EMX__) || defined (__CYGWIN__)
 #  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)
 
 /* 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, *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 = 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)
     {
       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')
       {
         *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 = 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.  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);
 
   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;
 #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);
   rv = 0;
 
   if ((file = open (output, mode, 0600)) == -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;
     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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