summaryrefslogtreecommitdiff
path: root/mysys/default.c
blob: f66a35a56c55e15adeba3575de765952897ad479 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
/* Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
   Copyright (c) 2011, 2018, MariaDB Corporation

   This program 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; version 2 of the License.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA */

/****************************************************************************
 Add all options from files named "group".cnf from the default_directories
 before the command line arguments.
 On Windows defaults will also search in the Windows directory for a file
 called 'group'.ini
 As long as the program uses the last argument for conflicting
 options one only have to add a call to "load_defaults" to enable
 use of default values.
 pre- and end 'blank space' are removed from options and values. The
 following escape sequences are recognized in values:  \b \t \n \r \\

 The following arguments are handled automaticly;  If used, they must be
 first argument on the command line!
 --no-defaults	; no options are read.
 --defaults-file=full-path-to-default-file	; Only this file will be read.
 --defaults-extra-file=full-path-to-default-file ; Read this file before ~/
 --defaults-group-suffix  ; Also read groups with concat(group, suffix)
 --print-defaults	  ; Print the modified command line and exit
****************************************************************************/

#include "mysys_priv.h"
#include "m_string.h"
#include "m_ctype.h"
#include <my_dir.h>
#ifdef __WIN__
#include <winbase.h>
#endif

/**
   arguments separator

   load_defaults() loads arguments from config file and put them
   before the arguments from command line, this separator is used to
   separate the arguments loaded from config file and arguments user
   provided on command line.

   Options with value loaded from config file are always in the form
   '--option=value', while for command line options, the value can be
   given as the next argument. Thus we used a separator so that
   handle_options() can distinguish them.

   Note: any other places that does not need to distinguish them
   should skip the separator.

   The content of arguments separator does not matter, one should only
   check the pointer, use "----args-separator----" here to ease debug
   if someone misused it.

   The args seprator will only be added when
   my_getopt_use_args_seprator is set to TRUE before calling
   load_defaults();

   See BUG#25192
*/
static const char *args_separator= "----args-separator----";
inline static void set_args_separator(char** arg)
{
  DBUG_ASSERT(my_getopt_use_args_separator);
  *arg= (char*)args_separator;
}
my_bool my_getopt_use_args_separator= FALSE;
my_bool my_getopt_is_args_separator(const char* arg)
{
  return (arg == args_separator);
}
const char *my_defaults_file=0;
const char *my_defaults_group_suffix=0;
const char *my_defaults_extra_file=0;

static char my_defaults_file_buffer[FN_REFLEN];
static char my_defaults_extra_file_buffer[FN_REFLEN];

static my_bool defaults_already_read= FALSE;

/* Which directories are searched for options (and in which order) */

#define MAX_DEFAULT_DIRS 6
#define DEFAULT_DIRS_SIZE (MAX_DEFAULT_DIRS + 1)  /* Terminate with NULL */
static const char **default_directories = NULL;

#ifdef __WIN__
static const char *f_extensions[]= { ".ini", ".cnf", 0 };
#define NEWLINE "\r\n"
#else
static const char *f_extensions[]= { ".cnf", 0 };
#define NEWLINE "\n"
#endif

static int handle_default_option(void *in_ctx, const char *group_name,
                                 const char *option);

/*
   This structure defines the context that we pass to callback
   function 'handle_default_option' used in search_default_file
   to process each option. This context is used if search_default_file
   was called from load_defaults.
*/

struct handle_option_ctx
{
   MEM_ROOT *alloc;
   DYNAMIC_ARRAY *args;
   TYPELIB *group;
};

static int search_default_file(Process_option_func func, void *func_ctx,
			       const char *dir, const char *config_file);
static int search_default_file_with_ext(Process_option_func func,
                                        void *func_ctx,
					const char *dir, const char *ext,
					const char *config_file, int recursion_level);


/**
  Create the list of default directories.

  @param alloc  MEM_ROOT where the list of directories is stored

  @details
  The directories searched, in order, are:
  - Windows:     GetSystemWindowsDirectory()
  - Windows:     GetWindowsDirectory()
  - Windows:     C:/
  - Windows:     Directory above where the executable is located
  - Unix:        /etc/
  - Unix:        /etc/mysql/
  - Unix:        --sysconfdir=<path> (compile-time option)
  - ALL:         getenv("MYSQL_HOME")
  - ALL:         --defaults-extra-file=<path> (run-time option)
  - Unix:        ~/

  On all systems, if a directory is already in the list, it will be moved
  to the end of the list.  This avoids reading defaults files multiple times,
  while ensuring the correct precedence.

  @retval NULL  Failure (out of memory, probably)
  @retval other Pointer to NULL-terminated array of default directories
*/

static const char **init_default_directories(MEM_ROOT *alloc);


static char *remove_end_comment(char *ptr);


/*
  Expand a file name so that the current working directory is added if
  the name is relative.

  RETURNS
   0   All OK
   2   Out of memory or path to long
   3   Not able to get working directory
 */

static int
fn_expand(const char *filename, char *result_buf)
{
  char dir[FN_REFLEN];
  const int flags= MY_UNPACK_FILENAME | MY_SAFE_PATH | MY_RELATIVE_PATH;
  DBUG_ENTER("fn_expand");
  DBUG_PRINT("enter", ("filename: %s, result_buf: 0x%lx",
                       filename, (unsigned long) result_buf));
  if (my_getwd(dir, sizeof(dir), MYF(0)))
    DBUG_RETURN(3);
  DBUG_PRINT("debug", ("dir: %s", dir));
  if (fn_format(result_buf, filename, dir, "", flags) == NULL)
    DBUG_RETURN(2);
  DBUG_PRINT("return", ("result: %s", result_buf));
  DBUG_RETURN(0);
}

/*
  Process config files in default directories.

  SYNOPSIS
  my_search_option_files()
  conf_file                   Basename for configuration file to search for.
                              If this is a path, then only this file is read.
  argc                        Pointer to argc of original program
  argv                        Pointer to argv of original program
  args_used                   Pointer to variable for storing the number of
                              arguments used.
  func                        Pointer to the function to process options
  func_ctx                    It's context. Usually it is the structure to
                              store additional options.
  DESCRIPTION
    Process the default options from argc & argv
    Read through each found config file looks and calls 'func' to process
    each option.

  NOTES
    --defaults-group-suffix is only processed if we are called from
    load_defaults().


  RETURN
    0  ok
    1  given cinf_file doesn't exist
    2  out of memory
    3  Can't get current working directory

    The global variable 'my_defaults_group_suffix' is updated with value for
    --defaults_group_suffix
*/

int my_search_option_files(const char *conf_file, int *argc, char ***argv,
                           uint *args_used, Process_option_func func,
                           void *func_ctx, const char **default_directories)
{
  const char **dirs, *forced_default_file, *forced_extra_defaults;
  int error= 0;
  DBUG_ENTER("my_search_option_files");

  /* Check if we want to force the use a specific default file */
  *args_used+= get_defaults_options(*argc - *args_used, *argv + *args_used,
                                    (char **) &forced_default_file,
                                    (char **) &forced_extra_defaults,
                                    (char **) &my_defaults_group_suffix);

  if (! my_defaults_group_suffix)
    my_defaults_group_suffix= getenv("MYSQL_GROUP_SUFFIX");

  if (forced_extra_defaults && !defaults_already_read)
  {
    int error= fn_expand(forced_extra_defaults, my_defaults_extra_file_buffer);
    if (error)
      DBUG_RETURN(error);
    my_defaults_extra_file= my_defaults_extra_file_buffer;
  }

  if (forced_default_file && !defaults_already_read)
  {
    int error= fn_expand(forced_default_file, my_defaults_file_buffer);
    if (error)
      DBUG_RETURN(error);
    my_defaults_file= my_defaults_file_buffer;
  }

  defaults_already_read= TRUE;

  /*
    We can only handle 'defaults-group-suffix' if we are called from
    load_defaults() as otherwise we can't know the type of 'func_ctx'
  */

  if (my_defaults_group_suffix && func == handle_default_option)
  {
    /* Handle --defaults-group-suffix= */
    uint i;
    const char **extra_groups;
    const size_t instance_len= strlen(my_defaults_group_suffix); 
    struct handle_option_ctx *ctx= (struct handle_option_ctx*) func_ctx;
    char *ptr;
    TYPELIB *group= ctx->group;
    
    if (!(extra_groups= 
	  (const char**)alloc_root(ctx->alloc,
                                   (2*group->count+1)*sizeof(char*))))
      DBUG_RETURN(2);
    
    for (i= 0; i < group->count; i++)
    {
      size_t len;
      extra_groups[i]= group->type_names[i]; /** copy group */
      
      len= strlen(extra_groups[i]);
      if (!(ptr= alloc_root(ctx->alloc, (uint) (len+instance_len+1))))
       DBUG_RETURN(2);
      
      extra_groups[i+group->count]= ptr;
      
      /** Construct new group */
      memcpy(ptr, extra_groups[i], len);
      memcpy(ptr+len, my_defaults_group_suffix, instance_len+1);
    }
    
    group->count*= 2;
    group->type_names= extra_groups;
    group->type_names[group->count]= 0;
  }
  
  if (my_defaults_file)
  {
    if ((error= search_default_file_with_ext(func, func_ctx, "", "",
                                             my_defaults_file, 0)) < 0)
      goto err;
    if (error > 0)
    {
      fprintf(stderr, "Could not open required defaults file: %s\n",
              my_defaults_file);
      goto err;
    }
  }
  else if (dirname_length(conf_file))
  {
    if ((error= search_default_file(func, func_ctx, NullS, conf_file)) < 0)
      goto err;
  }
  else
  {
    for (dirs= default_directories ; *dirs; dirs++)
    {
      if (**dirs)
      {
	if (search_default_file(func, func_ctx, *dirs, conf_file) < 0)
	  goto err;
      }
      else if (my_defaults_extra_file)
      {
        if ((error= search_default_file_with_ext(func, func_ctx, "", "",
                                                my_defaults_extra_file, 0)) < 0)
	  goto err;				/* Fatal error */
        if (error > 0)
        {
          fprintf(stderr, "Could not open required defaults file: %s\n",
                  my_defaults_extra_file);
          goto err;
        }
      }
    }
  }

  DBUG_RETURN(0);

err:
  fprintf(stderr,"Fatal error in defaults handling. Program aborted\n");
  DBUG_RETURN(1);
}


/*
  The option handler for load_defaults.

  SYNOPSIS
    handle_deault_option()
    in_ctx                  Handler context. In this case it is a
                            handle_option_ctx structure.
    group_name              The name of the group the option belongs to.
    option                  The very option to be processed. It is already
                            prepared to be used in argv (has -- prefix). If it
                            is NULL, we are handling a new group (section).

  DESCRIPTION
    This handler checks whether a group is one of the listed and adds an option
    to the array if yes. Some other handler can record, for instance, all
    groups and their options, not knowing in advance the names and amount of
    groups.

  RETURN
    0 - ok
    1 - error occured
*/

static int handle_default_option(void *in_ctx, const char *group_name,
                                 const char *option)
{
  char *tmp;
  struct handle_option_ctx *ctx= (struct handle_option_ctx *) in_ctx;

  if (!option)
    return 0;

  if (find_type((char *)group_name, ctx->group, FIND_TYPE_NO_PREFIX))
  {
    if (!(tmp= alloc_root(ctx->alloc, strlen(option) + 1)))
      return 1;
    if (insert_dynamic(ctx->args, (uchar*) &tmp))
      return 1;
    strmov(tmp, option);
  }

  return 0;
}


/*
  Gets options from the command line

  SYNOPSIS
    get_defaults_options()
    argc			Pointer to argc of original program
    argv			Pointer to argv of original program
    defaults                    --defaults-file option
    extra_defaults              --defaults-extra-file option

  RETURN
    # Number of arguments used from *argv
      defaults and extra_defaults will be set to option of the appropriate
      items of argv array, or to NULL if there are no such options
*/

int get_defaults_options(int argc, char **argv,
                         char **defaults,
                         char **extra_defaults,
                         char **group_suffix)
{
  int org_argc= argc, prev_argc= 0;
  *defaults= *extra_defaults= *group_suffix= 0;

  while (argc >= 2 && argc != prev_argc)
  {
    /* Skip program name or previously handled argument */
    argv++;
    prev_argc= argc;                            /* To check if we found */
    if (!*defaults && is_prefix(*argv,"--defaults-file="))
    {
      *defaults= *argv + sizeof("--defaults-file=")-1;
       argc--;
       continue;
    }
    if (!*extra_defaults && is_prefix(*argv,"--defaults-extra-file="))
    {
      *extra_defaults= *argv + sizeof("--defaults-extra-file=")-1;
      argc--;
      continue;
    }
    if (!*group_suffix && is_prefix(*argv, "--defaults-group-suffix="))
    {
      *group_suffix= *argv + sizeof("--defaults-group-suffix=")-1;
      argc--;
      continue;
    }
  }
  return org_argc - argc;
}

/*
  Wrapper around my_load_defaults() for interface compatibility.

  SYNOPSIS
    load_defaults()
    conf_file			Basename for configuration file to search for.
    				If this is a path, then only this file is read.
    groups			Which [group] entrys to read.
				Points to an null terminated array of pointers
    argc			Pointer to argc of original program
    argv			Pointer to argv of original program

  NOTES

    This function is NOT thread-safe as it uses a global pointer internally.
    See also notes for my_load_defaults().

  RETURN
    0 ok
    1 The given conf_file didn't exists
*/
int load_defaults(const char *conf_file, const char **groups,
                  int *argc, char ***argv)
{
  return my_load_defaults(conf_file, groups, argc, argv, &default_directories);
}

/*
  Read options from configurations files

  SYNOPSIS
    my_load_defaults()
    conf_file			Basename for configuration file to search for.
    				If this is a path, then only this file is read.
    groups			Which [group] entrys to read.
				Points to an null terminated array of pointers
    argc			Pointer to argc of original program
    argv			Pointer to argv of original program
    default_directories         Pointer to a location where a pointer to the list
                                of default directories will be stored

  IMPLEMENTATION

   Read options from configuration files and put them BEFORE the arguments
   that are already in argc and argv.  This way the calling program can
   easily command line options override options in configuration files

   NOTES
    In case of fatal error, the function will print a warning and do
    exit(1)
 
    To free used memory one should call free_defaults() with the argument
    that was put in *argv

   RETURN
     - If successful, 0 is returned. If 'default_directories' is not NULL,
     a pointer to the array of default directory paths is stored to a location
     it points to. That stored value must be passed to my_search_option_files()
     later.
     
     - 1 is returned if the given conf_file didn't exist. In this case, the
     value pointed to by default_directories is undefined.
*/


int my_load_defaults(const char *conf_file, const char **groups,
                  int *argc, char ***argv, const char ***default_directories)
{
  DYNAMIC_ARRAY args;
  TYPELIB group;
  my_bool found_print_defaults= 0;
  uint args_used= 0;
  int error= 0;
  MEM_ROOT alloc;
  char *ptr,**res;
  struct handle_option_ctx ctx;
  const char **dirs;
  uint args_sep= my_getopt_use_args_separator ? 1 : 0;
  DBUG_ENTER("load_defaults");

  init_alloc_root(&alloc,512,0);
  if ((dirs= init_default_directories(&alloc)) == NULL)
    goto err;
  /*
    Check if the user doesn't want any default option processing
    --no-defaults is always the first option
  */
  if (*argc >= 2 && !strcmp(argv[0][1],"--no-defaults"))
  {
    /* remove the --no-defaults argument and return only the other arguments */
    uint i, j;
    if (!(ptr=(char*) alloc_root(&alloc,sizeof(alloc)+
				 (*argc + 1)*sizeof(char*))))
      goto err;
    res= (char**) (ptr+sizeof(alloc));
    res[0]= **argv;				/* Copy program name */
    j= 1;                 /* Start from 1 for the reset result args */
    if (my_getopt_use_args_separator)
    {
      /* set arguments separator */
      set_args_separator(&res[1]);
      j++;
    }
    for (i=2 ; i < (uint) *argc ; i++, j++)
      res[j]=argv[0][i];
    res[j]=0;					/* End pointer */
    /*
      Update the argc, if have not added args separator, then we have
      to decrease argc because we have removed the "--no-defaults".
    */
    if (!my_getopt_use_args_separator)
      (*argc)--;
    *argv=res;
    *(MEM_ROOT*) ptr= alloc;			/* Save alloc root for free */
    if (default_directories)
      *default_directories= dirs;
    DBUG_RETURN(0);
  }

  group.count=0;
  group.name= "defaults";
  group.type_names= groups;

  for (; *groups ; groups++)
    group.count++;

  if (my_init_dynamic_array(&args, sizeof(char*),*argc, 32))
    goto err;

  ctx.alloc= &alloc;
  ctx.args= &args;
  ctx.group= &group;

  if ((error= my_search_option_files(conf_file, argc, argv, &args_used,
                                     handle_default_option, (void *) &ctx,
                                     dirs)))
  {
    delete_dynamic(&args);
    free_root(&alloc,MYF(0));
    DBUG_RETURN(error);
  }
  /*
    Here error contains <> 0 only if we have a fully specified conf_file
    or a forced default file
  */
  if (!(ptr=(char*) alloc_root(&alloc,sizeof(alloc)+
			       (args.elements + *argc + 1 + args_sep) *sizeof(char*))))
    goto err;
  res= (char**) (ptr+sizeof(alloc));

  /* copy name + found arguments + command line arguments to new array */
  res[0]= argv[0][0];  /* Name MUST be set, even by embedded library */
  memcpy((uchar*) (res+1), args.buffer, args.elements*sizeof(char*));
  /* Skip --defaults-xxx options */
  (*argc)-= args_used;
  (*argv)+= args_used;

  /*
    Check if we wan't to see the new argument list
    This options must always be the last of the default options
  */
  if (*argc >= 2 && !strcmp(argv[0][1],"--print-defaults"))
  {
    found_print_defaults=1;
    --*argc; ++*argv;				/* skip argument */
  }

  if (my_getopt_use_args_separator)
  {
    /* set arguments separator for arguments from config file and
       command line */
    set_args_separator(&res[args.elements+1]);
  }

  if (*argc)
    memcpy((uchar*) (res+1+args.elements+args_sep), (char*) ((*argv)+1),
	   (*argc-1)*sizeof(char*));
  res[args.elements+ *argc+args_sep]=0;                /* last null */

  (*argc)+=args.elements+args_sep;
  *argv= (char**) res;
  *(MEM_ROOT*) ptr= alloc;			/* Save alloc root for free */
  delete_dynamic(&args);
  if (found_print_defaults)
  {
    int i;
    printf("%s would have been started with the following arguments:\n",
	   **argv);
    for (i=1 ; i < *argc ; i++)
      if (!my_getopt_is_args_separator((*argv)[i])) /* skip arguments separator */
        printf("%s ", (*argv)[i]);
    puts("");
    exit(0);
  }

  if (default_directories)
    *default_directories= dirs;

  DBUG_RETURN(0);

 err:
  fprintf(stderr,"Fatal error in defaults handling. Program aborted\n");
  exit(1);
  return 0;					/* Keep compiler happy */
}


void free_defaults(char **argv)
{
  MEM_ROOT ptr;
  memcpy(&ptr, ((char *) argv) - sizeof(ptr), sizeof(ptr));
  free_root(&ptr,MYF(0));
}


static int search_default_file(Process_option_func opt_handler,
                               void *handler_ctx,
			       const char *dir,
			       const char *config_file)
{
  char **ext;
  const char *empty_list[]= { "", 0 };
  my_bool have_ext= fn_ext(config_file)[0] != 0;
  const char **exts_to_use= have_ext ? empty_list : f_extensions;

  for (ext= (char**) exts_to_use; *ext; ext++)
  {
    int error;
    if ((error= search_default_file_with_ext(opt_handler, handler_ctx,
                                             dir, *ext,
					     config_file, 0)) < 0)
      return error;
  }
  return 0;
}


/*
  Skip over keyword and get argument after keyword

  SYNOPSIS
   get_argument()
   keyword		Include directive keyword
   kwlen		Length of keyword
   ptr			Pointer to the keword in the line under process
   line			line number

  RETURN
   0	error
   #	Returns pointer to the argument after the keyword.
*/

static char *get_argument(const char *keyword, size_t kwlen,
                          char *ptr, char *name, uint line)
{
  char *end;

  /* Skip over "include / includedir keyword" and following whitespace */

  for (ptr+= kwlen - 1;
       my_isspace(&my_charset_latin1, ptr[0]);
       ptr++)
  {}

  /*
    Trim trailing whitespace from directory name
    The -1 below is for the newline added by fgets()
    Note that my_isspace() is true for \r and \n
  */
  for (end= ptr + strlen(ptr) - 1;
       my_isspace(&my_charset_latin1, *(end - 1));
       end--)
  {}
  end[0]= 0;                                    /* Cut off end space */

  /* Print error msg if there is nothing after !include* directive */
  if (end <= ptr)
  {
    fprintf(stderr,
	    "error: Wrong '!%s' directive in config file: %s at line %d\n",
	    keyword, name, line);
    return 0;
  }
  return ptr;
}


/*
  Open a configuration file (if exists) and read given options from it

  SYNOPSIS
    search_default_file_with_ext()
    opt_handler                 Option handler function. It is used to process
                                every separate option.
    handler_ctx                 Pointer to the structure to store actual 
                                parameters of the function.
    dir				directory to read
    ext				Extension for configuration file
    config_file                 Name of configuration file
    group			groups to read
    recursion_level             the level of recursion, got while processing
                                "!include" or "!includedir"

  RETURN
    0   Success
    -1	Fatal error, abort
     1	File not found (Warning)
*/

static int search_default_file_with_ext(Process_option_func opt_handler,
                                        void *handler_ctx,
                                        const char *dir,
                                        const char *ext,
                                        const char *config_file,
                                        int recursion_level)
{
  char name[FN_REFLEN + 10], buff[4096], curr_gr[4096], *ptr, *end, **tmp_ext;
  char *value, option[4096+2], tmp[FN_REFLEN];
  static const char includedir_keyword[]= "includedir";
  static const char include_keyword[]= "include";
  const int max_recursion_level= 10;
  MYSQL_FILE *fp;
  uint line=0;
  my_bool found_group=0;
  uint i;
  MY_DIR *search_dir;
  FILEINFO *search_file;

  if ((dir ? strlen(dir) : 0 )+strlen(config_file) >= FN_REFLEN-3)
    return 0;					/* Ignore wrong paths */
  if (dir)
  {
    end=convert_dirname(name, dir, NullS);
    if (dir[0] == FN_HOMELIB)		/* Add . to filenames in home */
      *end++='.';
    strxmov(end,config_file,ext,NullS);
  }
  else
  {
    strmov(name,config_file);
  }
  fn_format(name,name,"","",4);
#if !defined(__WIN__)
  {
    MY_STAT stat_info;
    if (!my_stat(name,&stat_info,MYF(0)))
      return 1;
    /*
      Ignore world-writable regular files.
      This is mainly done to protect us to not read a file created by
      the mysqld server, but the check is still valid in most context. 
    */
    if ((stat_info.st_mode & S_IWOTH) &&
	(stat_info.st_mode & S_IFMT) == S_IFREG)
    {
      fprintf(stderr, "Warning: World-writable config file '%s' is ignored\n",
              name);
      return 0;
    }
  }
#endif
  if (!(fp= mysql_file_fopen(key_file_cnf, name, O_RDONLY, MYF(0))))
    return 1;					/* Ignore wrong files */

  while (mysql_file_fgets(buff, sizeof(buff) - 1, fp))
  {
    line++;
    /* Ignore comment and empty lines */
    for (ptr= buff; my_isspace(&my_charset_latin1, *ptr); ptr++)
    {}

    if (*ptr == '#' || *ptr == ';' || !*ptr)
      continue;

    /* Configuration File Directives */
    if (*ptr == '!')
    {
      if (recursion_level >= max_recursion_level)
      {
        for (end= ptr + strlen(ptr) - 1; 
             my_isspace(&my_charset_latin1, *(end - 1));
             end--)
        {}
        end[0]= 0;
        fprintf(stderr,
                "Warning: skipping '%s' directive as maximum include"
                "recursion level was reached in file %s at line %d\n",
                ptr, name, line);
        continue;
      }

      /* skip over `!' and following whitespace */
      for (++ptr; my_isspace(&my_charset_latin1, ptr[0]); ptr++)
      {}

      if ((!strncmp(ptr, includedir_keyword,
                    sizeof(includedir_keyword) - 1)) &&
          my_isspace(&my_charset_latin1, ptr[sizeof(includedir_keyword) - 1]))
      {
	if (!(ptr= get_argument(includedir_keyword,
                                sizeof(includedir_keyword),
                                ptr, name, line)))
	  goto err;

        if (!(search_dir= my_dir(ptr, MYF(MY_WME))))
          goto err;

        for (i= 0; i < (uint) search_dir->number_off_files; i++)
        {
          search_file= search_dir->dir_entry + i;
          ext= fn_ext2(search_file->name);

          /* check extension */
          for (tmp_ext= (char**) f_extensions; *tmp_ext; tmp_ext++)
          {
            if (!strcmp(ext, *tmp_ext))
              break;
          }

          if (*tmp_ext)
          {
            fn_format(tmp, search_file->name, ptr, "",
                      MY_UNPACK_FILENAME | MY_SAFE_PATH);

            search_default_file_with_ext(opt_handler, handler_ctx, "", "", tmp,
                                         recursion_level + 1);
          }
        }

        my_dirend(search_dir);
      }
      else if ((!strncmp(ptr, include_keyword, sizeof(include_keyword) - 1)) &&
               my_isspace(&my_charset_latin1, ptr[sizeof(include_keyword)-1]))
      {
	if (!(ptr= get_argument(include_keyword,
                                sizeof(include_keyword), ptr,
                                name, line)))
	  goto err;

        search_default_file_with_ext(opt_handler, handler_ctx, "", "", ptr,
                                     recursion_level + 1);
      }

      continue;
    }

    if (*ptr == '[')				/* Group name */
    {
      found_group=1;
      if (!(end=(char *) strchr(++ptr,']')))
      {
	fprintf(stderr,
		"error: Wrong group definition in config file: %s at line %d\n",
		name,line);
	goto err;
      }
      /* Remove end space */
      for ( ; my_isspace(&my_charset_latin1,end[-1]) ; end--) ;
      end[0]=0;

      strmake(curr_gr, ptr, min((size_t) (end-ptr)+1, sizeof(curr_gr)-1));

      /* signal that a new group is found */
      opt_handler(handler_ctx, curr_gr, NULL);

      continue;
    }
    if (!found_group)
    {
      fprintf(stderr,
	      "error: Found option without preceding group in config file: %s at line: %d\n",
	      name,line);
      goto err;
    }
    
   
    end= remove_end_comment(ptr);
    if ((value= strchr(ptr, '=')))
      end= value;				/* Option without argument */
    for ( ; my_isspace(&my_charset_latin1,end[-1]) ; end--) ;
    if (!value)
    {
      strmake(strmov(option,"--"),ptr, (size_t) (end-ptr));
      if (opt_handler(handler_ctx, curr_gr, option))
        goto err;
    }
    else
    {
      /* Remove pre- and end space */
      char *value_end;
      for (value++ ; my_isspace(&my_charset_latin1,*value); value++) ;
      value_end=strend(value);
      /*
	We don't have to test for value_end >= value as we know there is
	an '=' before
      */
      for ( ; my_isspace(&my_charset_latin1,value_end[-1]) ; value_end--) ;
      if (value_end < value)			/* Empty string */
	value_end=value;

      /* remove quotes around argument */
      if ((*value == '\"' || *value == '\'') && /* First char is quote */
          (value + 1 < value_end ) && /* String is longer than 1 */
          *value == value_end[-1] ) /* First char is equal to last char */
      {
	value++;
	value_end--;
      }
      ptr=strnmov(strmov(option,"--"),ptr,(size_t) (end-ptr));
      *ptr++= '=';

      for ( ; value != value_end; value++)
      {
	if (*value == '\\' && value != value_end-1)
	{
	  switch(*++value) {
	  case 'n':
	    *ptr++='\n';
	    break;
	  case 't':
	    *ptr++= '\t';
	    break;
	  case 'r':
	    *ptr++ = '\r';
	    break;
	  case 'b':
	    *ptr++ = '\b';
	    break;
	  case 's':
	    *ptr++= ' ';			/* space */
	    break;
	  case '\"':
	    *ptr++= '\"';
	    break;
	  case '\'':
	    *ptr++= '\'';
	    break;
	  case '\\':
	    *ptr++= '\\';
	    break;
	  default:				/* Unknown; Keep '\' */
	    *ptr++= '\\';
	    *ptr++= *value;
	    break;
	  }
	}
	else
	  *ptr++= *value;
      }
      *ptr=0;
      if (opt_handler(handler_ctx, curr_gr, option))
        goto err;
    }
  }
  mysql_file_fclose(fp, MYF(0));
  return(0);

 err:
  mysql_file_fclose(fp, MYF(0));
  return -1;					/* Fatal error */
}


static char *remove_end_comment(char *ptr)
{
  char quote= 0;	/* we are inside quote marks */
  char escape= 0;	/* symbol is protected by escape chagacter */

  for (; *ptr; ptr++)
  {
    if ((*ptr == '\'' || *ptr == '\"') && !escape)
    {
      if (!quote)
	quote= *ptr;
      else if (quote == *ptr)
	quote= 0;
    }
    /* We are not inside a string */
    if (!quote && *ptr == '#')
    {
      *ptr= 0;
      return ptr;
    }
    escape= (quote && *ptr == '\\' && !escape);
  }
  return ptr;
}


void my_print_default_files(const char *conf_file)
{
  const char *empty_list[]= { "", 0 };
  my_bool have_ext= fn_ext(conf_file)[0] != 0;
  const char **exts_to_use= have_ext ? empty_list : f_extensions;
  char name[FN_REFLEN], **ext;

  puts("\nDefault options are read from the following files in the given order:");

  if (dirname_length(conf_file))
    fputs(conf_file,stdout);
  else
  {
    const char **dirs;
    MEM_ROOT alloc;
    init_alloc_root(&alloc,512,0);

    if ((dirs= init_default_directories(&alloc)) == NULL)
    {
      fputs("Internal error initializing default directories list", stdout);
    }
    else
    {
      for ( ; *dirs; dirs++)
      {
        for (ext= (char**) exts_to_use; *ext; ext++)
        {
          const char *pos;
          char *end;
          if (**dirs)
            pos= *dirs;
          else if (my_defaults_extra_file)
            pos= my_defaults_extra_file;
          else
            continue;
          end= convert_dirname(name, pos, NullS);
          if (name[0] == FN_HOMELIB)	/* Add . to filenames in home */
            *end++= '.';
          strxmov(end, conf_file, *ext, " ", NullS);
          fputs(name, stdout);
        }
      }
    }

    free_root(&alloc, MYF(0));
  }
  puts("");
}

void print_defaults(const char *conf_file, const char **groups)
{
  const char **groups_save= groups;
  my_print_default_files(conf_file);

  fputs("The following groups are read:",stdout);
  for ( ; *groups ; groups++)
  {
    fputc(' ',stdout);
    fputs(*groups,stdout);
  }

  if (my_defaults_group_suffix)
  {
    groups= groups_save;
    for ( ; *groups ; groups++)
    {
      fputc(' ',stdout);
      fputs(*groups,stdout);
      fputs(my_defaults_group_suffix,stdout);
    }
  }
  puts("\nThe following options may be given as the first argument:\n\
--print-defaults          Print the program argument list and exit.\n\
--no-defaults             Don't read default options from any option file.\n\
The following specify which files/extra groups are read (specified before remaining options):\n\
--defaults-file=#         Only read default options from the given file #.\n\
--defaults-extra-file=#   Read this file after the global files are read.\n\
--defaults-group-suffix=# Additionally read default groups with # appended as a suffix.");
}


static int add_directory(MEM_ROOT *alloc, const char *dir, const char **dirs)
{
  char buf[FN_REFLEN];
  size_t len;
  char *p;
  my_bool err __attribute__((unused));

  len= normalize_dirname(buf, dir);
  if (!(p= strmake_root(alloc, buf, len)))
    return 1;  /* Failure */
  /* Should never fail if DEFAULT_DIRS_SIZE is correct size */
  err= array_append_string_unique(p, dirs, DEFAULT_DIRS_SIZE);
  DBUG_ASSERT(err == FALSE);

  return 0;
}


#ifdef __WIN__
/*
  This wrapper for GetSystemWindowsDirectory() will dynamically bind to the
  function if it is available, emulate it on NT4 Terminal Server by stripping
  the \SYSTEM32 from the end of the results of GetSystemDirectory(), or just
  return GetSystemDirectory().
 */

typedef UINT (WINAPI *GET_SYSTEM_WINDOWS_DIRECTORY)(LPSTR, UINT);

static size_t my_get_system_windows_directory(char *buffer, size_t size)
{
  size_t count;
  GET_SYSTEM_WINDOWS_DIRECTORY
    func_ptr= (GET_SYSTEM_WINDOWS_DIRECTORY)
              GetProcAddress(GetModuleHandle("kernel32.dll"),
                                             "GetSystemWindowsDirectoryA");

  if (func_ptr)
    return func_ptr(buffer, (uint) size);

  /*
    Windows NT 4.0 Terminal Server Edition:  
    To retrieve the shared Windows directory, call GetSystemDirectory and
    trim the "System32" element from the end of the returned path.
  */
  count= GetSystemDirectory(buffer, (uint) size);
  if (count > 8 && stricmp(buffer+(count-8), "\\System32") == 0)
  {
    count-= 8;
    buffer[count] = '\0';
  }
  return count;
}


static const char *my_get_module_parent(char *buf, size_t size)
{
  char *last= NULL;
  char *end;
  if (!GetModuleFileName(NULL, buf, (DWORD) size))
    return NULL;
  end= strend(buf);

  /*
    Look for the second-to-last \ in the filename, but hang on
    to a pointer after the last \ in case we're in the root of
    a drive.
  */
  for ( ; end > buf; end--)
  {
    if (*end == FN_LIBCHAR)
    {
      if (last)
      {
        /* Keep the last '\' as this works both with D:\ and a directory */
        end[1]= 0;
        break;
      }
      last= end;
    }
  }

  return buf;
}
#endif /* __WIN__ */


static const char **init_default_directories(MEM_ROOT *alloc)
{
  const char **dirs;
  char *env;
  int errors= 0;
  DBUG_ENTER("init_default_directories");

  dirs= (const char **)alloc_root(alloc, DEFAULT_DIRS_SIZE * sizeof(char *));
  if (dirs == NULL)
    DBUG_RETURN(NULL);
  bzero((char *) dirs, DEFAULT_DIRS_SIZE * sizeof(char *));

#ifdef __WIN__

  {
    char fname_buffer[FN_REFLEN];
    if (my_get_system_windows_directory(fname_buffer, sizeof(fname_buffer)))
      errors += add_directory(alloc, fname_buffer, dirs);

    if (GetWindowsDirectory(fname_buffer, sizeof(fname_buffer)))
      errors += add_directory(alloc, fname_buffer, dirs);

    errors += add_directory(alloc, "C:/", dirs);

    if (my_get_module_parent(fname_buffer, sizeof(fname_buffer)) != NULL)
      errors += add_directory(alloc, fname_buffer, dirs);
  }

#else

  errors += add_directory(alloc, "/etc/", dirs);
  errors += add_directory(alloc, "/etc/mysql/", dirs);

#if defined(DEFAULT_SYSCONFDIR)
  if (DEFAULT_SYSCONFDIR[0])
    errors += add_directory(alloc, DEFAULT_SYSCONFDIR, dirs);
#endif /* DEFAULT_SYSCONFDIR */

#endif

  if ((env= getenv("MYSQL_HOME")))
    errors += add_directory(alloc, env, dirs);

  /* Placeholder for --defaults-extra-file=<path> */
  errors += add_directory(alloc, "", dirs);

#if !defined(__WIN__)
  errors += add_directory(alloc, "~/", dirs);
#endif

  DBUG_RETURN(errors > 0 ? NULL : dirs);
}