summaryrefslogtreecommitdiff
path: root/dmake/expand.c
blob: b7232303177e2d6c00258fd2ec105869d1ac5c25 (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
/* $RCSfile: expand.c,v $
-- $Revision: 1.8 $
-- last change: $Author: ihi $ $Date: 2007-10-15 15:38:46 $
--
-- SYNOPSIS
--      Macro expansion code.
--
-- DESCRIPTION
--
--  This routine handles all the necessary junk that deals with macro
--  expansion.  It understands the following syntax.  If a macro is
--  not defined it expands to NULL, and {} are synonyms for ().
--
--      $$      - expands to $
--      {{      - expands to {
--          }}      - expands to }
--      $A      - expands to whatever the macro A is defined as
--      $(AA)   - expands to whatever the macro AA is defined as
--      $($(A)) - represents macro indirection
--      <+...+> - get mapped to $(mktmp ...)
--
--        following macro is recognized
--
--                string1{ token_list }string2
--
--        and expands to string1 prepended to each element of token_list and
--        string2 appended to each of the resulting tokens from the first
--        operation.  If string2 is of the form above then the result is
--        the cross product of the specified (possibly modified) token_lists.
--
--        The folowing macro modifiers are defined and expanded:
--
--               $(macro:modifier_list:modifier_list:...)
--
--        where modifier_list a combination of:
--
--               D or d      - Directory portion of token including separator
--               F or f      - File portion of token including suffix
--               B or b      - basename portion of token not including suffix
--               E or e      - Suffix portion of name
--               L or l      - translate to lower case
--               U or u      - translate to upper case
--               I or i      - return inferred names
--               N or n      - return normalized paths
--               1           - return the first white space separated token
--
--    or a single one of:
--               M or m      - map escape codes
--               S or s      - pattern substitution (simple)
--               T or t      - for tokenization
--               ^           - prepend a prefix to each token
--               +           - append a suffix to each token
--
--        NOTE:  Modifiers are applied once the macro value has been found.
--               Thus the construct $($(test):s/joe/mary/) is defined and
--               modifies the value of $($(test))
--
--         Also the construct $(m:d:f) is not the same as $(m:df)
--         the first applies d to the value of $(m) and then
--         applies f to the value of that whereas the second form
--         applies df to the value of $(m).
--
-- AUTHOR
--      Dennis Vadura, dvadura@dmake.wticorp.com
--
-- WWW
--      http://dmake.wticorp.com/
--
-- COPYRIGHT
--      Copyright (c) 1996,1997 by WTI Corp.  All rights reserved.
--
--      This program is NOT free software; you can redistribute it and/or
--      modify it under the terms of the Software License Agreement Provided
--      in the file <distribution-root>/readme/license.txt.
--
-- LOG
--      Use cvs log to obtain detailed change logs.
*/

#include "extern.h"

/* Microsoft BRAINDAMAGE ALERT!!!!
 * This #ifdef is here only to satisfy stupid bugs in MSC5.0 and MSC5.1
 * it isn't needed for anything else.  It turns loop optimization off. */
#if defined(_MSV_VER) && _MSC_VER < 600
#include "optoff.h"
#endif

static  char*   _scan_macro ANSI((char*, char**, int));
static  char*   _scan_brace ANSI((char*, char**, int*));
static  char*   _cross_prod ANSI((char*, char*));

#if !defined(__GNUC__) && !defined(__IBMC__)
static  char*   _scan_ballanced_parens ANSI((char*, char));
#else
static  char*   _scan_ballanced_parens ANSI((char*, int));
#endif


PUBLIC char *
Expand( src )/*
===============
      This is the driver routine for the expansion, it identifies non-white
      space tokens and gets the ScanToken routine to figure out if they should
      be treated in a special way. */

char *src;                    /* pointer to source string  */
{
   char  *tmp;            /* pointer to temporary str  */
   char  *res;                /* pointer to result string  */
   char  *start;              /* pointer to start of token */

   DB_ENTER( "Expand" );
   DB_PRINT( "exp", ("Expanding [%s]", src) );

   res = DmStrDup( "" );
   if( src == NIL(char) ) DB_RETURN( res );

   while( *src ) {
      char *ks, *ke;

      /* Here we find the next non white space token in the string
       * and find it's end, with respect to non-significant white space. */

#if !defined( _MPW) && !defined(__EMX__)
      start = DmStrSpn( src, " \t\n" );
#else
      start = DmStrSpn( src, " \t\r\n" );
#endif

      res   = DmStrJoin( res, src, start-src, TRUE );
      if( !(*start) ) break;

      /* START <+...+> KLUDGE */
      if(   (ks=DmStrStr(start,"<+")) != NIL(char)
         && (ke=DmStrStr(ks,"+>")) != NIL(char) ){
     char *t1, *t2;

     res = DmStrJoin( res, t2=Expand(t1=DmSubStr(start,ks)), -1, TRUE);
     FREE(t1); FREE(t2);

     t1 = DmSubStr(ks+2, ke+1); t1[ke-ks-2] = ')';
     t2 = DmStrJoin( "$(mktmp ", t1, -1,FALSE);
     FREE(t1);
     res = DmStrJoin( res, t2=Expand(t2), -1, TRUE);
     FREE(t2);
     src = ke+2;
      }
      /* END <+...+> KLUDGE */
      else {
     res   = DmStrJoin( res, tmp = ScanToken(start,&src,TRUE), -1, TRUE );
     FREE( tmp );
      }
   }

   DB_PRINT( "exp", ("Returning [%s]", res) );
   DB_RETURN( res );
}


PUBLIC char *
Apply_edit( src, pat, subst, fr, anchor )/*
===========================================
   Take the src string and apply the pattern substitution.  ie. look for
   occurrences of pat in src and replace each occurrence with subst.  This is
   NOT a regular expressions pattern substitution, it's just not worth it.

   if anchor == TRUE then the src pattern match must be at the end of a token.
   ie. this is for SYSV compatibility and is only used for substitutions of
   the caused by $(macro:pat=sub).  So if src = "fre.o.k june.o" then
   $(src:.o=.a) results in "fre.o.k june.a", and $(src:s/.o/.a) results in
   "fre.a.k june.a" */

char *src;          /* the source string */
char *pat;          /* pattern to find   */
char *subst;            /* substitute string */
int   fr;           /* if TRUE free src  */
int   anchor;           /* if TRUE anchor    */
{
   char *res;
   char *p;
   char *s;
   int   l;

   DB_ENTER( "Apply_edit" );

   /* do nothing if pat is NULL or pat and subst are equal */
   if( !*pat || !strcmp(pat,subst) ) DB_RETURN( src );

   DB_PRINT( "mod", ("Source str:  [%s]", src) );
   DB_PRINT( "mod", ("Replacing [%s], with [%s]", pat, subst) );

   /* FIXME: This routine is used frequently and has room for optimizations */
   s   = src;
   l   = strlen( pat );
   if( (p = DmStrStr( s, pat )) != NIL(char) ) {
      res = DmStrDup( "" );
      do {
     if( anchor )
        if( !*(p+l) || (strchr(" \t", *(p+l)) != NIL(char)) )
           res = DmStrJoin( DmStrJoin(res,s,p-s,TRUE), subst, -1, TRUE );
        else
           res = DmStrJoin( res, s, p+l-s, TRUE );
     else
        res = DmStrJoin( DmStrJoin(res,s,p-s,TRUE), subst, -1, TRUE );

     s   = p + l;
      }
      while( (p = DmStrStr( s, pat )) != NIL(char) );

      res = DmStrJoin( res, s, -1, TRUE );
      if( fr ) FREE( src );
   }
   else
      res = src;


   DB_PRINT( "mod", ("Result [%s]", res) );
   DB_RETURN( res );
}


PUBLIC void
Map_esc( tok )/*
================
   Map an escape sequence and replace it by it's corresponding character
   value.  It is assumed that tok points at the initial \, the esc
   sequence in the original string is replaced and the value of tok
   is not modified. */
char *tok;
{
   if( strchr( "\"\\vantbrf01234567", tok[1] ) ) {
      size_t len;
      switch( tok[1] ) {
     case 'a' : *tok = 0x07; break;
     case 'b' : *tok = '\b'; break;
     case 'f' : *tok = '\f'; break;
     case 'n' : *tok = '\n'; break;
     case 'r' : *tok = '\r'; break;
     case 't' : *tok = '\t'; break;
     case 'v' : *tok = 0x0b; break;
     case '\\': *tok = '\\'; break;
     case '\"': *tok = '\"'; break;

     default: {
        register int i = 0;
        register int j = 0;
        for( ; i<2 && isdigit(tok[2]); i++ ) {
           j = (j << 3) + (tok[1] - '0');
           len = strlen(tok+2)+1;
           memmove( tok+1, tok+2, len );
        }
        j = (j << 3) + (tok[1] - '0');
        *tok = j;
     }
      }
      len = strlen(tok+2)+1;
      memmove( tok+1, tok+2, len );
   }
}


PUBLIC char*
Apply_modifiers( mod, src )/*
=============================
   This routine applies the appropriate modifiers to the string src
   and returns the proper result string */

int  mod;
char *src;
{
   char    *s;
   char    *e;
   char    *res;
   TKSTR   str;

   DB_ENTER( "Apply_modifiers" );

   if ( mod & INFNAME_FLAG ) {
      SET_TOKEN( &str, src );
      e = NIL(char);

      while( *(s = Get_token( &str, "", FALSE )) != '\0' ) {
     HASHPTR hp;

     if ( (hp = Get_name(normalize_path(s), Defs, FALSE)) != NIL(HASH)
       && hp->CP_OWNR
       && hp->CP_OWNR->ce_fname
     ) {
        res = hp->CP_OWNR->ce_fname;
     }
     else
        res = s;

     if(str.tk_quote == 0) {
        /* Add leading quote. */
        e = DmStrApp(e, "\"");
        e = DmStrJoin(e, res, -1, TRUE);
        /* Append the trailing quote. */
        e = DmStrJoin(e, "\"", 1, TRUE);
     } else {
        e = DmStrApp(e, res);
     }

      }

      FREE(src);
      src = e;
      mod &= ~INFNAME_FLAG;
   }

   if ( mod & NORMPATH_FLAG ) {
      e = exec_normpath(src);

      FREE(src);
      src = e;
      mod &= ~NORMPATH_FLAG;
   }

   if(mod & (TOLOWER_FLAG|TOUPPER_FLAG) ) {
      int lower;
      lower = mod & TOLOWER_FLAG;

      for (s=src; *s; s++)
     if ( isalpha(*s) )
        *s = ((lower) ? tolower(*s) : toupper(*s));

      mod &= ~(TOLOWER_FLAG|TOUPPER_FLAG);
   }

   if (mod & JUST_FIRST_FLAG) {
      SET_TOKEN(&str, src);
      if ((s = Get_token(&str,"",FALSE)) != '\0') {
     /* Recycle the quote at the beginning. */
     if(str.tk_quote == 0) {
        s--;
     }
         e = DmStrDup(s);
     /* Add trailing quote. */
     if(str.tk_quote == 0) {
        e = DmStrJoin(e, "\"", 1, TRUE);
     }

         CLEAR_TOKEN(&str);
         FREE(src);
         src = e;
      }
      else {
         CLEAR_TOKEN(&str);
      }
      mod &= ~JUST_FIRST_FLAG;
   }

   if( !mod || mod == (SUFFIX_FLAG | DIRECTORY_FLAG | FILE_FLAG) )
      DB_RETURN( src );

   SET_TOKEN( &str, src );
   DB_PRINT( "mod", ("Source string [%s]", src) );
   res = DmStrDup("");

   while( *(s = Get_token( &str, "", FALSE )) != '\0' ) {
      char *tokstart = s;

      /* search for the directory portion of the filename.  If the
       * DIRECTORY_FLAG is set, then we want to keep the directory portion
       * othewise throw it away and blank out to the end of the token */

      if( (e = Basename(s)) != s) {
     if( !(mod & DIRECTORY_FLAG) ) {
        /* Move the basename to the start. */
        size_t len = strlen(e)+1;
        memmove(s, e, len);
     }
     else
        s = e;
      }
      /* s now points to the start of the basename. */


      /* search for the suffix, if there is none, treat it as a NULL suffix.
       * if no file name treat it as a NULL file name.  same copy op as
       * for directory case above */

      e = strrchr( s, '.' );            /* NULL suffix if e=0 */
      if( e == NIL(char) ) e = s+strlen(s);

      if( !(mod & FILE_FLAG) ) {
     /* Move the suffix to the start. */
     size_t len = strlen(e)+1;
         memmove(s, e, len);
      }
      else
     s = e;

      /* s now points to the start of the suffix. */


      /* The last and final part.  This is the suffix case, if we don't want
       * it then just erase it. */

      if( s != NIL(char) )
     if( !(mod & SUFFIX_FLAG) && s != str.tk_str )
        *s = '\0';


      /* only keep non-empty tokens. (This also discards empty quoted ""
       * tokens.) */
      if( strlen(tokstart) ) {
     /* Recycle the quote at the beginning. */
     if(str.tk_quote == 0) {
        tokstart--;
     }
     res = DmStrApp(res, tokstart);
     /* Add trailing quote. */
     if(str.tk_quote == 0) {
        res = DmStrJoin(res, "\"", 1, TRUE);
     }
      }
   }

   FREE(src);
   src = res;


   DB_PRINT( "mod", ("Result string [%s]", src) );
   DB_RETURN( src );
}


PUBLIC char*
Tokenize( src, separator, op, mapesc )/*
========================================
    Tokenize the input of src and join each token found together with
    the next token separated by the separator string.

    When doing the tokenization, <sp>, <tab>, <nl>, and \<nl> all
    constitute white space. */

char *src;
char *separator;
char op;
int  mapesc;
{
   TKSTR    tokens;
   char     *tok;
   char     *res;
   int      first = (op == 't' || op == 'T');

   DB_ENTER( "Tokenize" );

   /* map the escape codes in the separator string first */
   if ( mapesc )
      for(tok=separator; (tok = strchr(tok,ESCAPE_CHAR)) != NIL(char); tok++)
     Map_esc( tok );

   DB_PRINT( "exp", ("Separator [%s]", separator) );

   /* By default we return an empty string */
   res = DmStrDup( "" );

   /* Build the token list */
   SET_TOKEN( &tokens, src );
   while( *(tok = Get_token( &tokens, "", FALSE )) != '\0' ) {
      char *x;

      if( first ) {
     FREE( res );
     res   = DmStrDup( tok );
     first = FALSE;
      }
      else if (op == '^') {
     res = DmStrAdd(res, DmStrJoin(separator, tok, -1, FALSE), TRUE);
      }
      else if (op == '+') {
     res = DmStrAdd(res, DmStrJoin(tok, separator, -1, FALSE), TRUE);
      }
      else {
     res = DmStrJoin(res, x =DmStrJoin(separator, tok, -1, FALSE),
            -1, TRUE);
     FREE( x );
      }

      DB_PRINT( "exp", ("Tokenizing [%s] --> [%s]", tok, res) );
   }

   FREE( src );
   DB_RETURN( res );
}


static char*
_scan_ballanced_parens(p, delim)
char *p;
char delim;
{
   int pcount = 0;
   int bcount = 0;

   if ( p ) {
      do {
     if (delim)
        if( !(bcount || pcount) && *p == delim) {
           return(p);
        }

     if ( *p == '(' ) pcount++;
     else if ( *p == '{' ) bcount++;
     else if ( *p == ')' && pcount ) pcount--;
     else if ( *p == '}' && bcount ) bcount--;

     p++;
      }
      while (*p && (pcount || bcount || delim));
   }

   return(p);
}


PUBLIC char*
ScanToken( s, ps, doexpand )/*
==============================
      This routine scans the token characters one at a time and identifies
      macros starting with $( and ${ and calls _scan_macro to expand their
      value.   the string1{ token_list }string2 expansion is also handled.
      In this case a temporary result is maintained so that we can take it's
      cross product with any other token_lists that may possibly appear. */

char *s;        /* pointer to start of src string */
char **ps;      /* pointer to start pointer   */
int  doexpand;
{
   char *res;                 /* pointer to result          */
   char *start;               /* pointer to start of prefix */
   int  crossproduct = 0;     /* if 1 then computing X-prod */

   start = s;
   res   = DmStrDup( "" );
   while( 1 ) {
      switch( *s ) {
         /* Termination, We halt at seeing a space or a tab or end of string.
          * We return the value of the result with any new macro's we scanned
          * or if we were computing cross_products then we return the new
          * cross_product.
          * NOTE:  Once we start computing cross products it is impossible to
          *        stop.  ie. the semantics are such that once a {} pair is
          *        seen we compute cross products until termination. */

         case ' ':
         case '\t':
     case '\n':
     case '\r':
         case '\0':
     {
        char *tmp;

        *ps = s;
        if( !crossproduct )
           tmp = DmStrJoin( res, start, (s-start), TRUE );
        else
        {
           tmp = DmSubStr( start, s );
           tmp = _cross_prod( res, tmp );
        }
        return( tmp );
     }

         case '$':
         case '{':
     {
        /* Handle if it's a macro or if it's a {} construct.
         * The results of a macro expansion are handled differently based
         * on whether we have seen a {} beforehand. */

        char *tmp;
        tmp = DmSubStr( start, s );          /* save the prefix */

        if( *s == '$' ) {
           start = _scan_macro( s+1, &s, doexpand );

           if( crossproduct ) {
          res = _cross_prod( res, DmStrJoin( tmp, start, -1, TRUE ) );
           }
           else {
          res = DmStrJoin(res,tmp=DmStrJoin(tmp,start,-1,TRUE),-1,TRUE);
          FREE( tmp );
           }
           FREE( start );
        }
        else if( strchr("{ \t",s[1]) == NIL(char) ){
           int ok;
           start = _scan_brace( s+1, &s, &ok );

           if( ok ) {
          if ( crossproduct ) {
             res = _cross_prod(res,_cross_prod(tmp,start));
          }
          else {
             char *freeres;
             res = Tokenize(start,
                    freeres=DmStrJoin(res,tmp,-1,TRUE),
                    '^', FALSE);
             FREE(freeres);
             FREE(tmp);
          }
          crossproduct = TRUE;
           }
           else {
          res =DmStrJoin(res,tmp=DmStrJoin(tmp,start,-1,TRUE),-1,TRUE);
          FREE( start );
          FREE( tmp   );
           }
        }
        else {    /* handle the {{ case */
           res = DmStrJoin( res, start, (s-start+1), TRUE );
           s  += (s[1]=='{')?2:1;
           FREE( tmp );
        }

        start = s;
     }
     break;

     case '}':
        if( s[1] != '}' ) {
           /* error malformed macro expansion */
           s++;
        }
        else {    /* handle the }} case */
           res = DmStrJoin( res, start, (s-start+1), TRUE );
           s += 2;
           start = s;
        }
        break;

         default: s++;
      }
   }
}


static char*
_scan_macro( s, ps, doexpand )/*
================================
    This routine scans a macro use and expands it to the value.  It
    returns the macro's expanded value and modifies the pointer into the
    src string to point at the first character after the macro use.
    The types of uses recognized are:

        $$ and $<sp>    - expands to $
        $(name)     - expands to value of name
        ${name}     - same as above
        $($(name))  - recurses on macro names (any level)
    and
        $(func[,args ...] [data])
    and
            $(name:modifier_list:modifier_list:...)

    see comment for Expand for description of valid modifiers.

    NOTE that once a macro name bounded by ( or { is found only
    the appropriate terminator (ie. ( or } is searched for. */

char *s;        /* pointer to start of src string   */
char **ps;      /* pointer to start pointer     */
int  doexpand;          /* If TRUE enables macro expansion  */
{
   char sdelim;         /* start of macro delimiter         */
   char edelim;         /* corresponding end macro delim    */
   char *start;         /* start of prefix                  */
   char *macro_name;    /* temporary macro name             */
   char *recurse_name;  /* recursive macro name             */
   char *result;    /* result for macro expansion       */
   int  bflag = 0;      /* brace flag, ==0 => $A type macro */
   int  done  = 0;      /* != 0 => done macro search        */
   int  lev   = 0;      /* brace level                      */
   int  mflag = 0;      /* != 0 => modifiers present in mac */
   int  fflag = 0;  /* != 0 => GNU style function       */
   HASHPTR hp;      /* hash table pointer for macros    */

   DB_ENTER( "_scan_macro" );

   /* Check for $ at end of line, or $ followed by white space */
   /* FIXME: Shouldn't a single '$' be an error? */
   if( !*s || strchr(" \t", *s) != NIL(char)) {
      *ps = s;
      DB_RETURN( DmStrDup("") );
   }

   if( *s == '$' ) {    /* Take care of the simple $$ case. */
      *ps = s+1;
      DB_RETURN( DmStrDup("$") );
   }

   sdelim = *s;         /* set and remember start/end delim */
   if( sdelim == '(' )
      edelim = ')';
   else
      edelim = '}';

   start = s;           /* build up macro name, find its end */
   while( !done ) {
      switch( *s ) {
         case '(':              /* open macro brace */
         case '{':
        if( *s == sdelim ) {
           lev++;
           bflag++;
        }
        break;

         case ':':                              /* halt at modifier */
            if( lev == 1 && !fflag && doexpand ) {
               done = TRUE;
               mflag = 1;
            }
            else if( !lev )                     /* must be $: */
               Fatal( "Syntax error in macro [$%s]. A colon [:] cannot be a macro name.\n", start );

            /* continue if a colon is found but lev > 1 */
            break;

     case '\n':                             /* Not possible because of the
                                                 * following case. */
        Fatal( "DEBUG: No standalone '\n' [%s].\n", start );
        break;

     case '\\':                             /* Transform \<nl> -> ' '. */
            if( s[1] != '\n' ) {
          done = !lev;
          break;
            } else {
              size_t len;
          s[1] = ' ';
              len = strlen(s+1)+1;
          memmove( s, s+1, len );
        }
        /*FALLTHRU*/
     case ' ':
     case '\t':
        if ( lev == 1 ) fflag = 1;
        break;

     case '\0':             /* check for null */
        *ps = s;
        done = TRUE;
        if( lev ) {             /* catch $( or ${ without closing bracket */
           Fatal( "Syntax error in macro [$%s]. The closing bracket [%c] is missing.\n", start, edelim );
        } else
          Fatal( "DEBUG: This cannot occur! [%s].\n", start );
        break;

         case ')':              /* close macro brace */
         case '}':
        if( !lev )      /* A closing bracket without an .. */
           Fatal("Syntax error in macro [$%s]. Closing bracket [%c] cannot be a macro name.\n", start, *s );
        else if( *s == edelim ) --lev;
        /*FALLTHRU*/

         default:       /* Done when lev == 0. This means either no */
        done = !lev;    /* opening bracket (single letter macro) or */
                /* a fully enclosed $(..) or ${..} macro    */
                /* was found. */
      }
      s++;
   }

   /* Check if this is a $A type macro.  If so then we have to
    * handle it a little differently. */
   if( bflag )
      macro_name = DmSubStr( start+1, s-1 );
   else
      macro_name = DmSubStr( start, s );

   /* If we don't have to expand the macro we're done. */
   if (!doexpand) {
      *ps = s;
      DB_RETURN(macro_name);
   }

   /* Check to see if the macro name contains spaces, if so then treat it
    * as a GNU style function invocation and call the function mapper to
    * deal with it.  We do not call the function expander if the function
    * invocation begins with a '$' */
   if( fflag && *macro_name != '$' ) {
      result = Exec_function(macro_name);
   }
   else {
      /* Check if the macro is a recursive macro name, if so then
       * EXPAND the name before expanding the value */
      if( strchr( macro_name, '$' ) != NIL(char) ) {
     recurse_name = Expand( macro_name );
     FREE( macro_name );
     macro_name = recurse_name;
      }

      /* Code to do value expansion goes here, NOTE:  macros whose assign bit
     is one have been evaluated and assigned, they contain no further
     expansions and thus do not need their values expanded again. */

      if( (hp = GET_MACRO( macro_name )) != NIL(HASH) ) {
     if( hp->ht_flag & M_MARK )
        Fatal( "Detected circular macro [%s]", hp->ht_name );

     if( !(hp->ht_flag & M_EXPANDED) ) {
        hp->ht_flag |= M_MARK;
        result = Expand( hp->ht_value );
        hp->ht_flag ^= M_MARK;
     }
     else if( hp->ht_value != NIL(char) )
        result = DmStrDup( hp->ht_value );
     else
        result = DmStrDup( "" );

      }
      else {
     /* The use of an undefined macro implicitly defines it but
      * leaves its value to NIL(char). */
     hp = Def_macro( macro_name, NIL(char), M_EXPANDED );
     /* Setting M_INIT assures that this macro is treated unset like
      * default internal macros. (Necessary for *= and *:=) */
     hp->ht_flag |= M_INIT;

     result = DmStrDup( "" );
      }
      /* Mark macros as used only if we are not expanding them for
       * the purpose of a .IF test, so we can warn about redef after use*/
      if( !If_expand ) hp->ht_flag |= M_USED;

   }

   if( mflag ) {
      char separator;
      int  modifier_list = 0;
      int  aug_mod       = FALSE;
      char *pat1;
      char *pat2;
      char *p;

      /* We are inside of a macro expansion. The "build up macro name,
       * find its while loop above should have caught all \<nl> and
       * converted them to a real space. Let's verify this. */
      for( p=s; *p && *p != edelim && *p; p++ ) {
    if( p[0] == '\\' && p[1] == '\n' ) {
      size_t len;
      p[1] = ' ';
      len = strlen(p+1)+1;
      memmove( p, p+1, len );
    }
      }
      if( !*p )
     Fatal( "Syntax error in macro modifier pattern [$%s]. The closing bracket [%c] is missing.\n", start, edelim );

      /* Yet another brain damaged AUGMAKE kludge.  We should accept the
       * AUGMAKE bullshit of $(f:pat=sub) form of macro expansion.  In
       * order to do this we will forgo the normal processing if the
       * AUGMAKE solution pans out, otherwise we will try to process the
       * modifiers ala dmake.
       *
       * So we look for = in modifier string.
       * If found we process it and not do the normal stuff */

      for( p=s; *p && *p != '=' && *p != edelim; p++ );

      if( *p == '=' ) {
     char *tmp;

     pat1 = Expand(tmp = DmSubStr(s,p)); FREE(tmp);
     s = p+1;
     p = _scan_ballanced_parens(s+1, edelim);

     if ( !*p ) {
        Fatal( "Incomplete macro expression [%s]", s );
        p = s+1;
     }
     pat2 = Expand(tmp = DmSubStr(s,p)); FREE(tmp);

     result = Apply_edit( result, pat1, pat2, TRUE, TRUE );
     FREE( pat1 );
     FREE( pat2 );
     s = p;
     aug_mod = TRUE;
      }

      if( !aug_mod )
     while( *s && *s != edelim ) {      /* while not at end of macro */
        char switch_char;

        switch( switch_char = *s++ ) {
           case '1': modifier_list |= JUST_FIRST_FLAG;         break;

           case 'b':
           case 'B': modifier_list |= FILE_FLAG;           break;

           case 'd':
           case 'D': modifier_list |= DIRECTORY_FLAG;      break;

           case 'f':
           case 'F': modifier_list |= FILE_FLAG | SUFFIX_FLAG; break;

           case 'e':
           case 'E': modifier_list |= SUFFIX_FLAG; break;

           case 'l':
           case 'L': modifier_list |= TOLOWER_FLAG; break;

           case 'i':
           case 'I': modifier_list |= INFNAME_FLAG; break;

           case 'u':
           case 'U': modifier_list |= TOUPPER_FLAG; break;

           case 'm':
           case 'M':
          if( modifier_list || ( (*s != edelim) && (*s != ':') ) ) {
             Warning( "Map escape modifier must appear alone, ignored");
             modifier_list = 0;
          }
          else {
             /* map the escape codes in the separator string first */
             for(p=result; (p = strchr(p,ESCAPE_CHAR)) != NIL(char); p++)
                Map_esc( p );
          }
          /* find the end of the macro spec, or the start of a new
           * modifier list for further processing of the result */

          for( ; (*s != edelim) && (*s != ':') && *s; s++ );
          if( !*s )
             Fatal( "Syntax error in macro. [$%s].\n", start );
          if( *s == ':' ) s++;
          break;

           case 'n':
           case 'N': modifier_list |= NORMPATH_FLAG; break;

           case 'S':
           case 's':
          if( modifier_list ) {
             Warning( "Edit modifier must appear alone, ignored");
             modifier_list = 0;
          }
          else {
             separator = *s++;
             for( p=s; *p != separator && *p; p++ );

             if( !*p )
                Fatal( "Syntax error in subst macro. [$%s].\n", start );
             else {
            char *t1, *t2;
            pat1 = DmSubStr( s, p );
            for(s=p=p+1; (*p != separator) && *p; p++ );
            /* Before the parsing fixes in iz36027 the :s macro modifier
             * erroneously worked with patterns with missing pattern
             * separator, i.e. $(XXX:s#pat#sub). This is an error because
             * it prohibits the use of following macro modifiers.
             * I.e. $(XXX:s#pat#sub:u) falsely replaces with "sub:u".
             * ??? Remove this special case once OOo compiles without
             * any of this warnings. */
            if( !*p ) {
               if( *(p-1) == edelim ) {
                  p--;
                  Warning( "Syntax error in subst macro. Bracket found, but third delimiter [%c] missing in [$%s].\n", separator, start );
               }
               else {
                  Fatal( "Syntax error in subst macro. Third delimiter [%c] missing in [$%s].\n", separator, start );
               }
            }
            pat2 = DmSubStr( s, p );
            t1 = Expand(pat1); FREE(pat1);
            t2 = Expand(pat2); FREE(pat2);
            result = Apply_edit( result, t1, t2, TRUE, FALSE );
            FREE( t1 );
            FREE( t2 );
             }
             s = p;
          }
          /* find the end of the macro spec, or the start of a new
           * modifier list for further processing of the result */

          for( ; (*s != edelim) && (*s != ':') && *s; s++ );
          if( !*s )
             Fatal( "Syntax error in macro. [$%s].\n", start );
          if( *s == ':' ) s++;
          break;

           case 'T':
           case 't':
           case '^':
           case '+':
          if( modifier_list ) {
             Warning( "Tokenize modifier must appear alone, ignored");
             modifier_list = 0;
          }
          else {
             separator = *s++;

             if( separator == '$' ) {
            p = _scan_ballanced_parens(s,'\0');

            if ( *p ) {
               char *tmp;
               pat1 = Expand(tmp = DmSubStr(s-1,p));
               FREE(tmp);
               result = Tokenize(result, pat1, switch_char, TRUE);
               FREE(pat1);
            }
            else {
               Warning( "Incomplete macro expression [%s]", s );
            }
            s = p;
             }
             else if ( separator == '\"' ) {
            /* we change the semantics to allow $(v:t")") */
            for (p = s; *p && *p != separator; p++)
               if (*p == '\\')
                  if (p[1] == '\\' || p[1] == '"')
                 p++;

            if( *p == 0 )
               Fatal( "Unterminated separator string" );
            else {
               pat1 = DmSubStr( s, p );
               result = Tokenize( result, pat1, switch_char, TRUE);
               FREE( pat1 );
            }
            s = p;
             }
             else {
               Warning(
               "Separator must be a quoted string or macro expression");
             }

             /* find the end of the macro spec, or the start of a new
              * modifier list for further processing of the result */

             for( ; (*s != edelim) && (*s != ':'); s++ );
             if( *s == ':' ) s++;
          }
          break;

           case ':':
          if( modifier_list ) {
             result = Apply_modifiers( modifier_list, result );
             modifier_list = 0;
          }
          break;

           default:
          Warning( "Illegal modifier in macro, ignored" );
          break;
        }
     }

      if( modifier_list ) /* apply modifier */
         result = Apply_modifiers( modifier_list, result );

      s++;
   }

   *ps = s;
   FREE( macro_name );
   DB_RETURN( result );
}


static char*
_scan_brace( s, ps, flag )/*
============================
      This routine scans for { token_list } pairs.  It expands the value of
      token_list by calling Expand on it.  Token_list may be anything at all.
      Note that the routine count's ballanced parentheses.  This means you
      cannot have something like { fred { joe }, if that is what you really
      need the write it as { fred {{ joe }, flag is set to 1 if all ok
      and to 0 if the braces were unballanced. */

char *s;
char **ps;
int  *flag;
{
   char *t;
   char *start;
   char *res;
   int  lev  = 1;
   int  done = 0;

   DB_ENTER( "_scan_brace" );

   start = s;
   while( !done )
      switch( *s++ ) {
         case '{':
            if( *s == '{' ) break;              /* ignore {{ */
            lev++;
            break;

         case '}':
            if( *s == '}' ) break;              /* ignore }} */
        if( lev )
           if( --lev == 0 ) done = TRUE;
        break;

     case '$':
        if( *s == '{' || *s == '}' ) {
          if( (t = strchr(s,'}')) != NIL(char) )
             s = t;
          s++;
        }
        break;

         case '\0':
        if( lev ) {
           done = TRUE;
           s--;
           /* error malformed macro expansion */
        }
        break;
      }

   start = DmSubStr( start, (lev) ? s : s-1 );

   if( lev ) {
      /* Braces were not ballanced so just return the string.
       * Do not expand it. */

      res   = DmStrJoin( "{", start, -1, FALSE );
      *flag = 0;
   }
   else {
      *flag = 1;
      res   = Expand( start );

      if( (t = DmStrSpn( res, " \t" )) != res ) {
          size_t len = strlen(t)+1;
          memmove( res, t, len );
      }
   }

   FREE( start );       /* this is ok! start is assigned a DmSubStr above */
   *ps = s;

   DB_RETURN( res );
}


static char*
_cross_prod( x, y )/*
=====================
      Given two strings x and y compute the cross-product of the tokens found
      in each string.  ie. if x = "a b" and y = "c d" return "ac ad bc bd".

         NOTE:  buf will continue to grow until it is big enough to handle
                all cross product requests.  It is never freed!  (maybe I
            will fix this someday) */

char *x;
char *y;
{
   static char *buf = NULL;
   static int  buf_siz = 0;
   char *brkx;
   char *brky;
   char *cy;
   char *cx;
   char *res;
   int  i;

   if( *x && *y ) {
      res = DmStrDup( "" ); cx = x;
      while( *cx ) {
     cy = y;
         brkx = DmStrPbrk( cx, " \t\n" );
     if( (brkx-cx == 2) && *cx == '\"' && *(cx+1) == '\"' ) cx = brkx;

     while( *cy ) {
        brky = DmStrPbrk( cy, " \t\n" );
        if( (brky-cy == 2) && *cy == '\"' && *(cy+1) == '\"' ) cy = brky;
        i    = brkx-cx + brky-cy + 2;

        if( i > buf_siz ) {     /* grow buf to the correct size */
           if( buf != NIL(char) ) FREE( buf );
           if( (buf = MALLOC( i, char )) == NIL(char))  No_ram();
           buf_siz = i;
        }

        strncpy( buf, cx, (i = brkx-cx) );
        buf[i] = '\0';
        if (brky-cy > 0) strncat( buf, cy, brky-cy );
        buf[i+(brky-cy)] = '\0';
        strcat( buf, " " );
        res = DmStrJoin( res, buf, -1, TRUE );
        cy = DmStrSpn( brky, " \t\n" );
     }
     cx = DmStrSpn( brkx, " \t\n" );
      }

      FREE( x );
      res[ strlen(res)-1 ] = '\0';
   }
   else
      res = DmStrJoin( x, y, -1, TRUE );

   FREE( y );
   return( res );
}