bashhist.c

   1 /* bashhist.c -- bash interface to the GNU history library. */
   2
   3 /* Copyright (C) 1993-2009 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "config.h"
  22
  23 #if defined (HISTORY)
  24
  25 #if defined (HAVE_UNISTD_H)
  26 #  ifdef _MINIX
  27 #    include <sys/types.h>
  28 #  endif
  29 #  include <unistd.h>
  30 #endif
  31
  32 #include "bashtypes.h"
  33 #include <stdio.h>
  34 #include <errno.h>
  35 #include "bashansi.h"
  36 #include "posixstat.h"
  37 #include "filecntl.h"
  38
  39 #include "bashintl.h"
  40
  41 #include "shell.h"
  42 #include "flags.h"
  43 #include "input.h"
  44 #include "parser.h"     /* for the struct dstack stuff. */
  45 #include "pathexp.h"    /* for the struct ignorevar stuff */
  46 #include "bashhist.h"   /* matching prototypes and declarations */
  47 #include "builtins/common.h"
  48
  49 #include <readline/history.h>
  50 #include <glob/glob.h>
  51 #include <glob/strmatch.h>
  52
  53 #if defined (READLINE)
  54 #  include "bashline.h"
  55 extern int rl_done, rl_dispatching;     /* should really include readline.h */
  56 #endif
  57
  58 #if !defined (errno)
  59 extern int errno;
  60 #endif
  61
  62 static int histignore_item_func __P((struct ign *));
  63 static int check_history_control __P((char *));
  64 static void hc_erasedups __P((char *));
  65 static void really_add_history __P((char *));
  66
  67 static struct ignorevar histignore =
  68 {
  69   "HISTIGNORE",
  70   (struct ign *)0,
  71   0,
  72   (char *)0,
  73   (sh_iv_item_func_t *)histignore_item_func,
  74 };
  75
  76 #define HIGN_EXPAND 0x01
  77
  78 /* Declarations of bash history variables. */
  79 /* Non-zero means to remember lines typed to the shell on the history
  80    list.  This is different than the user-controlled behaviour; this
  81    becomes zero when we read lines from a file, for example. */
  82 int remember_on_history = 1;
  83 int enable_history_list = 1;    /* value for `set -o history' */
  84
  85 /* The number of lines that Bash has added to this history session.  The
  86    difference between the number of the top element in the history list
  87    (offset from history_base) and the number of lines in the history file.
  88    Appending this session's history to the history file resets this to 0. */
  89 int history_lines_this_session;
  90
  91 /* The number of lines that Bash has read from the history file. */
  92 int history_lines_in_file;
  93
  94 #if defined (BANG_HISTORY)
  95 /* Non-zero means do no history expansion on this line, regardless
  96    of what history_expansion says. */
  97 int history_expansion_inhibited;
  98 #endif
  99
 100 /* With the old default, every line was saved in the history individually.
 101    I.e., if the user enters:
 102         bash$ for i in a b c
 103         > do
 104         > echo $i
 105         > done
 106    Each line will be individually saved in the history.
 107         bash$ history
 108         10  for i in a b c
 109         11  do
 110         12  echo $i
 111         13  done
 112         14  history
 113    If the variable command_oriented_history is set, multiple lines
 114    which form one command will be saved as one history entry.
 115         bash$ for i in a b c
 116         > do
 117         > echo $i
 118         > done
 119         bash$ history
 120         10  for i in a b c
 121     do
 122     echo $i
 123     done
 124         11  history
 125    The user can then recall the whole command all at once instead
 126    of just being able to recall one line at a time.
 127
 128    This is now enabled by default.
 129    */
 130 int command_oriented_history = 1;
 131
 132 /* Set to 1 if the first line of a possibly-multi-line command was saved
 133    in the history list.  Managed by maybe_add_history(), but global so
 134    the history-manipluating builtins can see it. */
 135 int current_command_first_line_saved = 0;
 136
 137 /* Non-zero means to store newlines in the history list when using
 138    command_oriented_history rather than trying to use semicolons. */
 139 int literal_history;
 140
 141 /* Non-zero means to append the history to the history file at shell
 142    exit, even if the history has been stifled. */
 143 int force_append_history;
 144
 145 /* A nit for picking at history saving.  Flags have the following values:
 146
 147    Value == 0 means save all lines parsed by the shell on the history.
 148    Value & HC_IGNSPACE means save all lines that do not start with a space.
 149    Value & HC_IGNDUPS means save all lines that do not match the last
 150    line saved.
 151    Value & HC_ERASEDUPS means to remove all other matching lines from the
 152    history list before saving the latest line. */
 153 int history_control;
 154
 155 /* Set to 1 if the last command was added to the history list successfully
 156    as a separate history entry; set to 0 if the line was ignored or added
 157    to a previous entry as part of command-oriented-history processing. */
 158 int hist_last_line_added;
 159
 160 /* Set to 1 if builtins/history.def:push_history added the last history
 161    entry. */
 162 int hist_last_line_pushed;
 163
 164 #if defined (READLINE)
 165 /* If non-zero, and readline is being used, the user is offered the
 166    chance to re-edit a failed history expansion. */
 167 int history_reediting;
 168
 169 /* If non-zero, and readline is being used, don't directly execute a
 170    line with history substitution.  Reload it into the editing buffer
 171    instead and let the user further edit and confirm with a newline. */
 172 int hist_verify;
 173
 174 #endif /* READLINE */
 175
 176 /* Non-zero means to not save function definitions in the history list. */
 177 int dont_save_function_defs;
 178
 179 /* Variables declared in other files used here. */
 180 extern int current_command_line_count;
 181
 182 extern struct dstack dstack;
 183
 184 static int bash_history_inhibit_expansion __P((char *, int));
 185 #if defined (READLINE)
 186 static void re_edit __P((char *));
 187 #endif
 188 static int history_expansion_p __P((char *));
 189 static int shell_comment __P((char *));
 190 static int should_expand __P((char *));
 191 static HIST_ENTRY *last_history_entry __P((void));
 192 static char *expand_histignore_pattern __P((char *));
 193 static int history_should_ignore __P((char *));
 194
 195 /* Is the history expansion starting at string[i] one that should not
 196    be expanded? */
 197 static int
 198 bash_history_inhibit_expansion (string, i)
 199      char *string;
 200      int i;
 201 {
 202   /* The shell uses ! as a pattern negation character in globbing [...]
 203      expressions, so let those pass without expansion. */
 204   if (i > 0 && (string[i - 1] == '[') && member (']', string + i + 1))
 205     return (1);
 206   /* The shell uses ! as the indirect expansion character, so let those
 207      expansions pass as well. */
 208   else if (i > 1 && string[i - 1] == '{' && string[i - 2] == '$' &&
 209              member ('}', string + i + 1))
 210     return (1);
 211 #if defined (EXTENDED_GLOB)
 212   else if (extended_glob && i > 1 && string[i+1] == '(' && member (')', string + i + 2))
 213     return (1);
 214 #endif
 215   else
 216     return (0);
 217 }
 218
 219 void
 220 bash_initialize_history ()
 221 {
 222   history_quotes_inhibit_expansion = 1;
 223   history_search_delimiter_chars = ";&()|<>";
 224   history_inhibit_expansion_function = bash_history_inhibit_expansion;
 225 #if defined (BANG_HISTORY)
 226   sv_histchars ("histchars");
 227 #endif
 228 }
 229
 230 void
 231 bash_history_reinit (interact)
 232      int interact;
 233 {
 234 #if defined (BANG_HISTORY)
 235   history_expansion = interact != 0;
 236   history_expansion_inhibited = 1;
 237 #endif
 238   remember_on_history = enable_history_list = interact != 0;
 239   history_inhibit_expansion_function = bash_history_inhibit_expansion;
 240 }
 241
 242 void
 243 bash_history_disable ()
 244 {
 245   remember_on_history = 0;
 246 #if defined (BANG_HISTORY)
 247   history_expansion_inhibited = 1;
 248 #endif
 249 }
 250
 251 void
 252 bash_history_enable ()
 253 {
 254   remember_on_history = 1;
 255 #if defined (BANG_HISTORY)
 256   history_expansion_inhibited = 0;
 257 #endif
 258   history_inhibit_expansion_function = bash_history_inhibit_expansion;
 259   sv_history_control ("HISTCONTROL");
 260   sv_histignore ("HISTIGNORE");
 261 }
 262
 263 /* Load the history list from the history file. */
 264 void
 265 load_history ()
 266 {
 267   char *hf;
 268
 269   /* Truncate history file for interactive shells which desire it.
 270      Note that the history file is automatically truncated to the
 271      size of HISTSIZE if the user does not explicitly set the size
 272      differently. */
 273   set_if_not ("HISTSIZE", "500");
 274   sv_histsize ("HISTSIZE");
 275
 276   set_if_not ("HISTFILESIZE", get_string_value ("HISTSIZE"));
 277   sv_histsize ("HISTFILESIZE");
 278
 279   /* Read the history in HISTFILE into the history list. */
 280   hf = get_string_value ("HISTFILE");
 281
 282   if (hf && *hf && file_exists (hf))
 283     {
 284       read_history (hf);
 285       using_history ();
 286       history_lines_in_file = where_history ();
 287     }
 288 }
 289
 290 void
 291 bash_clear_history ()
 292 {
 293   clear_history ();
 294   history_lines_this_session = 0;
 295 }
 296
 297 /* Delete and free the history list entry at offset I. */
 298 int
 299 bash_delete_histent (i)
 300      int i;
 301 {
 302   HIST_ENTRY *discard;
 303
 304   discard = remove_history (i);
 305   if (discard)
 306     free_history_entry (discard);
 307   history_lines_this_session--;
 308
 309   return 1;
 310 }
 311
 312 int
 313 bash_delete_last_history ()
 314 {
 315   register int i;
 316   HIST_ENTRY **hlist, *histent;
 317   int r;
 318
 319   hlist = history_list ();
 320   if (hlist == NULL)
 321     return 0;
 322
 323   for (i = 0; hlist[i]; i++)
 324     ;
 325   i--;
 326
 327   /* History_get () takes a parameter that must be offset by history_base. */
 328   histent = history_get (history_base + i);     /* Don't free this */
 329   if (histent == NULL)
 330     return 0;
 331
 332   r = bash_delete_histent (i);
 333
 334   if (where_history () > history_length)
 335     history_set_pos (history_length);
 336
 337   return r;
 338 }
 339
 340 #ifdef INCLUDE_UNUSED
 341 /* Write the existing history out to the history file. */
 342 void
 343 save_history ()
 344 {
 345   char *hf;
 346
 347   hf = get_string_value ("HISTFILE");
 348   if (hf && *hf && file_exists (hf))
 349     {
 350       /* Append only the lines that occurred this session to
 351          the history file. */
 352       using_history ();
 353
 354       if (history_lines_this_session < where_history () || force_append_history)
 355         append_history (history_lines_this_session, hf);
 356       else
 357         write_history (hf);
 358       sv_histsize ("HISTFILESIZE");
 359     }
 360 }
 361 #endif
 362
 363 int
 364 maybe_append_history (filename)
 365      char *filename;
 366 {
 367   int fd, result;
 368   struct stat buf;
 369
 370   result = EXECUTION_SUCCESS;
 371   if (history_lines_this_session && (history_lines_this_session < where_history ()))
 372     {
 373       /* If the filename was supplied, then create it if necessary. */
 374       if (stat (filename, &buf) == -1 && errno == ENOENT)
 375         {
 376           fd = open (filename, O_WRONLY|O_CREAT, 0600);
 377           if (fd < 0)
 378             {
 379               builtin_error (_("%s: cannot create: %s"), filename, strerror (errno));
 380               return (EXECUTION_FAILURE);
 381             }
 382           close (fd);
 383         }
 384       result = append_history (history_lines_this_session, filename);
 385       history_lines_in_file += history_lines_this_session;
 386       history_lines_this_session = 0;
 387     }
 388   return (result);
 389 }
 390
 391 /* If this is an interactive shell, then append the lines executed
 392    this session to the history file. */
 393 int
 394 maybe_save_shell_history ()
 395 {
 396   int result;
 397   char *hf;
 398
 399   result = 0;
 400   if (history_lines_this_session)
 401     {
 402       hf = get_string_value ("HISTFILE");
 403
 404       if (hf && *hf)
 405         {
 406           /* If the file doesn't exist, then create it. */
 407           if (file_exists (hf) == 0)
 408             {
 409               int file;
 410               file = open (hf, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 411               if (file != -1)
 412                 close (file);
 413             }
 414
 415           /* Now actually append the lines if the history hasn't been
 416              stifled.  If the history has been stifled, rewrite the
 417              history file. */
 418           using_history ();
 419           if (history_lines_this_session <= where_history () || force_append_history)
 420             {
 421               result = append_history (history_lines_this_session, hf);
 422               history_lines_in_file += history_lines_this_session;
 423             }
 424           else
 425             {
 426               result = write_history (hf);
 427               history_lines_in_file = history_lines_this_session;
 428             }
 429           history_lines_this_session = 0;
 430
 431           sv_histsize ("HISTFILESIZE");
 432         }
 433     }
 434   return (result);
 435 }
 436
 437 #if defined (READLINE)
 438 /* Tell readline () that we have some text for it to edit. */
 439 static void
 440 re_edit (text)
 441      char *text;
 442 {
 443   if (bash_input.type == st_stdin)
 444     bash_re_edit (text);
 445 }
 446 #endif /* READLINE */
 447
 448 /* Return 1 if this line needs history expansion. */
 449 static int
 450 history_expansion_p (line)
 451      char *line;
 452 {
 453   register char *s;
 454
 455   for (s = line; *s; s++)
 456     if (*s == history_expansion_char || *s == history_subst_char)
 457       return 1;
 458   return 0;
 459 }
 460
 461 /* Do pre-processing on LINE.  If PRINT_CHANGES is non-zero, then
 462    print the results of expanding the line if there were any changes.
 463    If there is an error, return NULL, otherwise the expanded line is
 464    returned.  If ADDIT is non-zero the line is added to the history
 465    list after history expansion.  ADDIT is just a suggestion;
 466    REMEMBER_ON_HISTORY can veto, and does.
 467    Right now this does history expansion. */
 468 char *
 469 pre_process_line (line, print_changes, addit)
 470      char *line;
 471      int print_changes, addit;
 472 {
 473   char *history_value;
 474   char *return_value;
 475   int expanded;
 476
 477   return_value = line;
 478   expanded = 0;
 479
 480 #  if defined (BANG_HISTORY)
 481   /* History expand the line.  If this results in no errors, then
 482      add that line to the history if ADDIT is non-zero. */
 483   if (!history_expansion_inhibited && history_expansion && history_expansion_p (line))
 484     {
 485       expanded = history_expand (line, &history_value);
 486
 487       if (expanded)
 488         {
 489           if (print_changes)
 490             {
 491               if (expanded < 0)
 492                 internal_error ("%s", history_value);
 493 #if defined (READLINE)
 494               else if (hist_verify == 0 || expanded == 2)
 495 #else
 496               else
 497 #endif
 498                 fprintf (stderr, "%s\n", history_value);
 499             }
 500
 501           /* If there was an error, return NULL. */
 502           if (expanded < 0 || expanded == 2)    /* 2 == print only */
 503             {
 504 #    if defined (READLINE)
 505               if (expanded == 2 && rl_dispatching == 0 && *history_value)
 506 #    else
 507               if (expanded == 2 && *history_value)
 508 #    endif /* !READLINE */
 509                 maybe_add_history (history_value);
 510
 511               free (history_value);
 512
 513 #    if defined (READLINE)
 514               /* New hack.  We can allow the user to edit the
 515                  failed history expansion. */
 516               if (history_reediting && expanded < 0 && rl_done)
 517                 re_edit (line);
 518 #    endif /* READLINE */
 519               return ((char *)NULL);
 520             }
 521
 522 #    if defined (READLINE)
 523           if (hist_verify && expanded == 1)
 524             {
 525               re_edit (history_value);
 526               return ((char *)NULL);
 527             }
 528 #    endif
 529         }
 530
 531       /* Let other expansions know that return_value can be free'ed,
 532          and that a line has been added to the history list.  Note
 533          that we only add lines that have something in them. */
 534       expanded = 1;
 535       return_value = history_value;
 536     }
 537 #  endif /* BANG_HISTORY */
 538
 539   if (addit && remember_on_history && *return_value)
 540     maybe_add_history (return_value);
 541
 542 #if 0
 543   if (expanded == 0)
 544     return_value = savestring (line);
 545 #endif
 546
 547   return (return_value);
 548 }
 549
 550 /* Return 1 if the first non-whitespace character in LINE is a `#', indicating
 551  * that the line is a shell comment. */
 552 static int
 553 shell_comment (line)
 554      char *line;
 555 {
 556   char *p;
 557
 558   for (p = line; p && *p && whitespace (*p); p++)
 559     ;
 560   return (p && *p == '#');
 561 }
 562
 563 #ifdef INCLUDE_UNUSED
 564 /* Remove shell comments from LINE.  A `#' and anything after it is a comment.
 565    This isn't really useful yet, since it doesn't handle quoting. */
 566 static char *
 567 filter_comments (line)
 568      char *line;
 569 {
 570   char *p;
 571
 572   for (p = line; p && *p && *p != '#'; p++)
 573     ;
 574   if (p && *p == '#')
 575     *p = '\0';
 576   return (line);
 577 }
 578 #endif
 579
 580 /* Check LINE against what HISTCONTROL says to do.  Returns 1 if the line
 581    should be saved; 0 if it should be discarded. */
 582 static int
 583 check_history_control (line)
 584      char *line;
 585 {
 586   HIST_ENTRY *temp;
 587   int r;
 588
 589   if (history_control == 0)
 590     return 1;
 591
 592   /* ignorespace or ignoreboth */
 593   if ((history_control & HC_IGNSPACE) && *line == ' ')
 594     return 0;
 595
 596   /* ignoredups or ignoreboth */
 597   if (history_control & HC_IGNDUPS)
 598     {
 599       using_history ();
 600       temp = previous_history ();
 601
 602       r = (temp == 0 || STREQ (temp->line, line) == 0);
 603
 604       using_history ();
 605
 606       if (r == 0)
 607         return r;
 608     }
 609
 610   return 1;
 611 }
 612
 613 /* Remove all entries matching LINE from the history list.  Triggered when
 614    HISTCONTROL includes `erasedups'. */
 615 static void
 616 hc_erasedups (line)
 617      char *line;
 618 {
 619   HIST_ENTRY *temp;
 620   int r;
 621
 622   using_history ();
 623   while (temp = previous_history ())
 624     {
 625       if (STREQ (temp->line, line))
 626         {
 627           r = where_history ();
 628           remove_history (r);
 629         }
 630     }
 631   using_history ();
 632 }
 633
 634 /* Add LINE to the history list, handling possibly multi-line compound
 635    commands.  We note whether or not we save the first line of each command
 636    (which is usually the entire command and history entry), and don't add
 637    the second and subsequent lines of a multi-line compound command if we
 638    didn't save the first line.  We don't usually save shell comment lines in
 639    compound commands in the history, because they could have the effect of
 640    commenting out the rest of the command when the entire command is saved as
 641    a single history entry (when COMMAND_ORIENTED_HISTORY is enabled).  If
 642    LITERAL_HISTORY is set, we're saving lines in the history with embedded
 643    newlines, so it's OK to save comment lines.  We also make sure to save
 644    multiple-line quoted strings or other constructs. */
 645 void
 646 maybe_add_history (line)
 647      char *line;
 648 {
 649   hist_last_line_added = 0;
 650
 651   /* Don't use the value of history_control to affect the second
 652      and subsequent lines of a multi-line command (old code did
 653      this only when command_oriented_history is enabled). */
 654   if (current_command_line_count > 1)
 655     {
 656       if (current_command_first_line_saved &&
 657           (literal_history || dstack.delimiter_depth != 0 || shell_comment (line) == 0))
 658         bash_add_history (line);
 659       return;
 660     }
 661
 662   /* This is the first line of a (possible multi-line) command.  Note whether
 663      or not we should save the first line and remember it. */
 664   current_command_first_line_saved = check_add_history (line, 0);
 665 }
 666
 667 /* Just check LINE against HISTCONTROL and HISTIGNORE and add it to the
 668    history if it's OK.  Used by `history -s' as well as maybe_add_history().
 669    Returns 1 if the line was saved in the history, 0 otherwise. */
 670 int
 671 check_add_history (line, force)
 672      char *line;
 673      int force;
 674 {
 675   if (check_history_control (line) && history_should_ignore (line) == 0)
 676     {
 677       /* We're committed to saving the line.  If the user has requested it,
 678          remove other matching lines from the history. */
 679       if (history_control & HC_ERASEDUPS)
 680         hc_erasedups (line);
 681
 682       if (force)
 683         {
 684           really_add_history (line);
 685           using_history ();
 686         }
 687       else
 688         bash_add_history (line);
 689       return 1;
 690     }
 691   return 0;
 692 }
 693
 694 /* Add a line to the history list.
 695    The variable COMMAND_ORIENTED_HISTORY controls the style of history
 696    remembering;  when non-zero, and LINE is not the first line of a
 697    complete parser construct, append LINE to the last history line instead
 698    of adding it as a new line. */
 699 void
 700 bash_add_history (line)
 701      char *line;
 702 {
 703   int add_it, offset, curlen;
 704   HIST_ENTRY *current, *old;
 705   char *chars_to_add, *new_line;
 706
 707   add_it = 1;
 708   if (command_oriented_history && current_command_line_count > 1)
 709     {
 710       chars_to_add = literal_history ? "\n" : history_delimiting_chars ();
 711
 712       using_history ();
 713       current = previous_history ();
 714
 715       if (current)
 716         {
 717           /* If the previous line ended with an escaped newline (escaped
 718              with backslash, but otherwise unquoted), then remove the quoted
 719              newline, since that is what happens when the line is parsed. */
 720           curlen = strlen (current->line);
 721
 722           if (dstack.delimiter_depth == 0 && current->line[curlen - 1] == '\\' &&
 723               current->line[curlen - 2] != '\\')
 724             {
 725               current->line[curlen - 1] = '\0';
 726               curlen--;
 727               chars_to_add = "";
 728             }
 729
 730           new_line = (char *)xmalloc (1
 731                                       + curlen
 732                                       + strlen (line)
 733                                       + strlen (chars_to_add));
 734           sprintf (new_line, "%s%s%s", current->line, chars_to_add, line);
 735           offset = where_history ();
 736           old = replace_history_entry (offset, new_line, current->data);
 737           free (new_line);
 738
 739           if (old)
 740             free_history_entry (old);
 741
 742           add_it = 0;
 743         }
 744     }
 745
 746   if (add_it)
 747     really_add_history (line);
 748
 749   using_history ();
 750 }
 751
 752 static void
 753 really_add_history (line)
 754      char *line;
 755 {
 756   hist_last_line_added = 1;
 757   hist_last_line_pushed = 0;
 758   add_history (line);
 759   history_lines_this_session++;
 760 }
 761
 762 int
 763 history_number ()
 764 {
 765   using_history ();
 766   return (remember_on_history ? history_base + where_history () : 1);
 767 }
 768
 769 static int
 770 should_expand (s)
 771      char *s;
 772 {
 773   char *p;
 774
 775   for (p = s; p && *p; p++)
 776     {
 777       if (*p == '\\')
 778         p++;
 779       else if (*p == '&')
 780         return 1;
 781     }
 782   return 0;
 783 }
 784
 785 static int
 786 histignore_item_func (ign)
 787      struct ign *ign;
 788 {
 789   if (should_expand (ign->val))
 790     ign->flags |= HIGN_EXPAND;
 791   return (0);
 792 }
 793
 794 void
 795 setup_history_ignore (varname)
 796      char *varname;
 797 {
 798   setup_ignore_patterns (&histignore);
 799 }
 800
 801 static HIST_ENTRY *
 802 last_history_entry ()
 803 {
 804   HIST_ENTRY *he;
 805
 806   using_history ();
 807   he = previous_history ();
 808   using_history ();
 809   return he;
 810 }
 811
 812 char *
 813 last_history_line ()
 814 {
 815   HIST_ENTRY *he;
 816
 817   he = last_history_entry ();
 818   if (he == 0)
 819     return ((char *)NULL);
 820   return he->line;
 821 }
 822
 823 static char *
 824 expand_histignore_pattern (pat)
 825      char *pat;
 826 {
 827   HIST_ENTRY *phe;
 828   char *ret;
 829
 830   phe = last_history_entry ();
 831
 832   if (phe == (HIST_ENTRY *)0)
 833     return (savestring (pat));
 834
 835   ret = strcreplace (pat, '&', phe->line, 1);
 836
 837   return ret;
 838 }
 839
 840 /* Return 1 if we should not put LINE into the history according to the
 841    patterns in HISTIGNORE. */
 842 static int
 843 history_should_ignore (line)
 844      char *line;
 845 {
 846   register int i, match;
 847   char *npat;
 848
 849   if (histignore.num_ignores == 0)
 850     return 0;
 851
 852   for (i = match = 0; i < histignore.num_ignores; i++)
 853     {
 854       if (histignore.ignores[i].flags & HIGN_EXPAND)
 855         npat = expand_histignore_pattern (histignore.ignores[i].val);
 856       else
 857         npat = histignore.ignores[i].val;
 858
 859       match = strmatch (npat, line, FNMATCH_EXTFLAG) != FNM_NOMATCH;
 860
 861       if (histignore.ignores[i].flags & HIGN_EXPAND)
 862         free (npat);
 863
 864       if (match)
 865         break;
 866     }
 867
 868   return match;
 869 }
 870 #endif /* HISTORY */