summaryrefslogtreecommitdiff
path: root/function.c
blob: 3282cdfc0537715ecff1995e3b500bfb73a7d0f0 (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
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
/* Builtin function expansion for GNU Make.
Copyright (C) 1988, 1989, 1991-1997, 1999, 2002 Free Software Foundation, Inc.
This file is part of GNU Make.

GNU Make is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Make 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 GNU Make; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include "make.h"
#include "filedef.h"
#include "variable.h"
#include "dep.h"
#include "job.h"
#include "commands.h"
#include "debug.h"

#ifdef _AMIGA
#include "amiga.h"
#endif


struct function_table_entry
  {
    const char *name;
    unsigned char len;
    unsigned char minimum_args;
    unsigned char maximum_args;
    char expand_args;
    char *(*func_ptr) PARAMS ((char *output, char **argv, const char *fname));
  };

static unsigned long
function_table_entry_hash_1 (const void *keyv)
{
  struct function_table_entry const *key = (struct function_table_entry const *) keyv;
  return_STRING_N_HASH_1 (key->name, key->len);
}

static unsigned long
function_table_entry_hash_2 (const void *keyv)
{
  struct function_table_entry const *key = (struct function_table_entry const *) keyv;
  return_STRING_N_HASH_2 (key->name, key->len);
}

static int
function_table_entry_hash_cmp (const void *xv, const void *yv)
{
  struct function_table_entry const *x = (struct function_table_entry const *) xv;
  struct function_table_entry const *y = (struct function_table_entry const *) yv;
  int result = x->len - y->len;
  if (result)
    return result;
  return_STRING_N_COMPARE (x->name, y->name, x->len);
}

static struct hash_table function_table;


/* Store into VARIABLE_BUFFER at O the result of scanning TEXT and replacing
   each occurrence of SUBST with REPLACE. TEXT is null-terminated.  SLEN is
   the length of SUBST and RLEN is the length of REPLACE.  If BY_WORD is
   nonzero, substitutions are done only on matches which are complete
   whitespace-delimited words.  If SUFFIX_ONLY is nonzero, substitutions are
   done only at the ends of whitespace-delimited words.  */

char *
subst_expand (char *o, char *text, char *subst, char *replace,
              unsigned int slen, unsigned int rlen,
              int by_word, int suffix_only)
{
  register char *t = text;
  register char *p;

  if (slen == 0 && !by_word && !suffix_only)
    {
      /* The first occurrence of "" in any string is its end.  */
      o = variable_buffer_output (o, t, strlen (t));
      if (rlen > 0)
	o = variable_buffer_output (o, replace, rlen);
      return o;
    }

  do
    {
      if ((by_word | suffix_only) && slen == 0)
	/* When matching by words, the empty string should match
	   the end of each word, rather than the end of the whole text.  */
	p = end_of_token (next_token (t));
      else
	{
	  p = sindex (t, 0, subst, slen);
	  if (p == 0)
	    {
	      /* No more matches.  Output everything left on the end.  */
	      o = variable_buffer_output (o, t, strlen (t));
	      return o;
	    }
	}

      /* Output everything before this occurrence of the string to replace.  */
      if (p > t)
	o = variable_buffer_output (o, t, p - t);

      /* If we're substituting only by fully matched words,
	 or only at the ends of words, check that this case qualifies.  */
      if ((by_word
	   && ((p > t && !isblank ((unsigned char)p[-1]))
	       || (p[slen] != '\0' && !isblank ((unsigned char)p[slen]))))
	  || (suffix_only
	      && (p[slen] != '\0' && !isblank ((unsigned char)p[slen]))))
	/* Struck out.  Output the rest of the string that is
	   no longer to be replaced.  */
	o = variable_buffer_output (o, subst, slen);
      else if (rlen > 0)
	/* Output the replacement string.  */
	o = variable_buffer_output (o, replace, rlen);

      /* Advance T past the string to be replaced.  */
      t = p + slen;
    } while (*t != '\0');

  return o;
}


/* Store into VARIABLE_BUFFER at O the result of scanning TEXT
   and replacing strings matching PATTERN with REPLACE.
   If PATTERN_PERCENT is not nil, PATTERN has already been
   run through find_percent, and PATTERN_PERCENT is the result.
   If REPLACE_PERCENT is not nil, REPLACE has already been
   run through find_percent, and REPLACE_PERCENT is the result.  */

char *
patsubst_expand (char *o, char *text, char *pattern, char *replace,
                 char *pattern_percent, char *replace_percent)
{
  unsigned int pattern_prepercent_len, pattern_postpercent_len;
  unsigned int replace_prepercent_len, replace_postpercent_len = 0;
  char *t;
  unsigned int len;
  int doneany = 0;

  /* We call find_percent on REPLACE before checking PATTERN so that REPLACE
     will be collapsed before we call subst_expand if PATTERN has no %.  */
  if (replace_percent == 0)
    replace_percent = find_percent (replace);
  if (replace_percent != 0)
    {
      /* Record the length of REPLACE before and after the % so
	 we don't have to compute these lengths more than once.  */
      replace_prepercent_len = replace_percent - replace;
      replace_postpercent_len = strlen (replace_percent + 1);
    }
  else
    /* We store the length of the replacement
       so we only need to compute it once.  */
    replace_prepercent_len = strlen (replace);

  if (pattern_percent == 0)
    pattern_percent = find_percent (pattern);
  if (pattern_percent == 0)
    /* With no % in the pattern, this is just a simple substitution.  */
    return subst_expand (o, text, pattern, replace,
			 strlen (pattern), strlen (replace), 1, 0);

  /* Record the length of PATTERN before and after the %
     so we don't have to compute it more than once.  */
  pattern_prepercent_len = pattern_percent - pattern;
  pattern_postpercent_len = strlen (pattern_percent + 1);

  while ((t = find_next_token (&text, &len)) != 0)
    {
      int fail = 0;

      /* Is it big enough to match?  */
      if (len < pattern_prepercent_len + pattern_postpercent_len)
	fail = 1;

      /* Does the prefix match? */
      if (!fail && pattern_prepercent_len > 0
	  && (*t != *pattern
	      || t[pattern_prepercent_len - 1] != pattern_percent[-1]
	      || !strneq (t + 1, pattern + 1, pattern_prepercent_len - 1)))
	fail = 1;

      /* Does the suffix match? */
      if (!fail && pattern_postpercent_len > 0
	  && (t[len - 1] != pattern_percent[pattern_postpercent_len]
	      || t[len - pattern_postpercent_len] != pattern_percent[1]
	      || !strneq (&t[len - pattern_postpercent_len],
			  &pattern_percent[1], pattern_postpercent_len - 1)))
	fail = 1;

      if (fail)
	/* It didn't match.  Output the string.  */
	o = variable_buffer_output (o, t, len);
      else
	{
	  /* It matched.  Output the replacement.  */

	  /* Output the part of the replacement before the %.  */
	  o = variable_buffer_output (o, replace, replace_prepercent_len);

	  if (replace_percent != 0)
	    {
	      /* Output the part of the matched string that
		 matched the % in the pattern.  */
	      o = variable_buffer_output (o, t + pattern_prepercent_len,
					  len - (pattern_prepercent_len
						 + pattern_postpercent_len));
	      /* Output the part of the replacement after the %.  */
	      o = variable_buffer_output (o, replace_percent + 1,
					  replace_postpercent_len);
	    }
	}

      /* Output a space, but not if the replacement is "".  */
      if (fail || replace_prepercent_len > 0
	  || (replace_percent != 0 && len + replace_postpercent_len > 0))
	{
	  o = variable_buffer_output (o, " ", 1);
	  doneany = 1;
	}
    }
  if (doneany)
    /* Kill the last space.  */
    --o;

  return o;
}


/* Look up a function by name.  */

static const struct function_table_entry *
lookup_function (const char *s)
{
  const char *e = s;

  while (*e && ( (*e >= 'a' && *e <= 'z') || *e == '-'))
    e++;
  if (*e == '\0' || isblank ((unsigned char) *e))
    {
      struct function_table_entry function_table_entry_key;
      function_table_entry_key.name = s;
      function_table_entry_key.len = e - s;

      return hash_find_item (&function_table, &function_table_entry_key);
    }
  return 0;
}


/* Return 1 if PATTERN matches STR, 0 if not.  */

int
pattern_matches (char *pattern, char *percent, char *str)
{
  unsigned int sfxlen, strlength;

  if (percent == 0)
    {
      unsigned int len = strlen (pattern) + 1;
      char *new_chars = (char *) alloca (len);
      bcopy (pattern, new_chars, len);
      pattern = new_chars;
      percent = find_percent (pattern);
      if (percent == 0)
	return streq (pattern, str);
    }

  sfxlen = strlen (percent + 1);
  strlength = strlen (str);

  if (strlength < (percent - pattern) + sfxlen
      || !strneq (pattern, str, percent - pattern))
    return 0;

  return !strcmp (percent + 1, str + (strlength - sfxlen));
}


/* Find the next comma or ENDPAREN (counting nested STARTPAREN and
   ENDPARENtheses), starting at PTR before END.  Return a pointer to
   next character.

   If no next argument is found, return NULL.
*/

static char *
find_next_argument (char startparen, char endparen,
                    const char *ptr, const char *end)
{
  int count = 0;

  for (; ptr < end; ++ptr)
    if (*ptr == startparen)
      ++count;

    else if (*ptr == endparen)
      {
	--count;
	if (count < 0)
	  return NULL;
      }

    else if (*ptr == ',' && !count)
      return (char *)ptr;

  /* We didn't find anything.  */
  return NULL;
}


/* Glob-expand LINE.  The returned pointer is
   only good until the next call to string_glob.  */

static char *
string_glob (char *line)
{
  static char *result = 0;
  static unsigned int length;
  register struct nameseq *chain;
  register unsigned int idx;

  chain = multi_glob (parse_file_seq
		      (&line, '\0', sizeof (struct nameseq),
		       /* We do not want parse_file_seq to strip `./'s.
			  That would break examples like:
			  $(patsubst ./%.c,obj/%.o,$(wildcard ./?*.c)).  */
		       0),
		      sizeof (struct nameseq));

  if (result == 0)
    {
      length = 100;
      result = (char *) xmalloc (100);
    }

  idx = 0;
  while (chain != 0)
    {
      register char *name = chain->name;
      unsigned int len = strlen (name);

      struct nameseq *next = chain->next;
      free ((char *) chain);
      chain = next;

      /* multi_glob will pass names without globbing metacharacters
	 through as is, but we want only files that actually exist.  */
      if (file_exists_p (name))
	{
	  if (idx + len + 1 > length)
	    {
	      length += (len + 1) * 2;
	      result = (char *) xrealloc (result, length);
	    }
	  bcopy (name, &result[idx], len);
	  idx += len;
	  result[idx++] = ' ';
	}

      free (name);
    }

  /* Kill the last space and terminate the string.  */
  if (idx == 0)
    result[0] = '\0';
  else
    result[idx - 1] = '\0';

  return result;
}

/*
  Builtin functions
 */

static char *
func_patsubst (char *o, char **argv, const char *funcname)
{
  o = patsubst_expand (o, argv[2], argv[0], argv[1], (char *) 0, (char *) 0);
  return o;
}


static char *
func_join (char *o, char **argv, const char *funcname)
{
  int doneany = 0;

  /* Write each word of the first argument directly followed
     by the corresponding word of the second argument.
     If the two arguments have a different number of words,
     the excess words are just output separated by blanks.  */
  register char *tp;
  register char *pp;
  char *list1_iterator = argv[0];
  char *list2_iterator = argv[1];
  do
    {
      unsigned int len1, len2;

      tp = find_next_token (&list1_iterator, &len1);
      if (tp != 0)
	o = variable_buffer_output (o, tp, len1);

      pp = find_next_token (&list2_iterator, &len2);
      if (pp != 0)
	o = variable_buffer_output (o, pp, len2);

      if (tp != 0 || pp != 0)
	{
	  o = variable_buffer_output (o, " ", 1);
	  doneany = 1;
	}
    }
  while (tp != 0 || pp != 0);
  if (doneany)
    /* Kill the last blank.  */
    --o;

  return o;
}


static char *
func_origin (char *o, char **argv, const char *funcname)
{
  /* Expand the argument.  */
  register struct variable *v = lookup_variable (argv[0], strlen (argv[0]));
  if (v == 0)
    o = variable_buffer_output (o, "undefined", 9);
  else
    switch (v->origin)
      {
      default:
      case o_invalid:
	abort ();
	break;
      case o_default:
	o = variable_buffer_output (o, "default", 7);
	break;
      case o_env:
	o = variable_buffer_output (o, "environment", 11);
	break;
      case o_file:
	o = variable_buffer_output (o, "file", 4);
	break;
      case o_env_override:
	o = variable_buffer_output (o, "environment override", 20);
	break;
      case o_command:
	o = variable_buffer_output (o, "command line", 12);
	break;
      case o_override:
	o = variable_buffer_output (o, "override", 8);
	break;
      case o_automatic:
	o = variable_buffer_output (o, "automatic", 9);
	break;
      }

  return o;
}

#ifdef VMS
# define IS_PATHSEP(c) ((c) == ']')
#else
# ifdef HAVE_DOS_PATHS
#  define IS_PATHSEP(c) ((c) == '/' || (c) == '\\')
# else
#  define IS_PATHSEP(c) ((c) == '/')
# endif
#endif


static char *
func_notdir_suffix (char *o, char **argv, const char *funcname)
{
  /* Expand the argument.  */
  char *list_iterator = argv[0];
  char *p2 =0;
  int doneany =0;
  unsigned int len=0;

  int is_suffix = streq (funcname, "suffix");
  int is_notdir = !is_suffix;
  while ((p2 = find_next_token (&list_iterator, &len)) != 0)
    {
      char *p = p2 + len;


      while (p >= p2 && (!is_suffix || *p != '.'))
	{
	  if (IS_PATHSEP (*p))
	    break;
	  --p;
	}

      if (p >= p2)
	{
	  if (is_notdir)
	    ++p;
	  else if (*p != '.')
	    continue;
	  o = variable_buffer_output (o, p, len - (p - p2));
	}
#ifdef HAVE_DOS_PATHS
      /* Handle the case of "d:foo/bar".  */
      else if (streq (funcname, "notdir") && p2[0] && p2[1] == ':')
	{
	  p = p2 + 2;
	  o = variable_buffer_output (o, p, len - (p - p2));
	}
#endif
      else if (is_notdir)
	o = variable_buffer_output (o, p2, len);

      if (is_notdir || p >= p2)
	{
	  o = variable_buffer_output (o, " ", 1);
	  doneany = 1;
	}
    }
  if (doneany)
    /* Kill last space.  */
    --o;


  return o;

}


static char *
func_basename_dir (char *o, char **argv, const char *funcname)
{
  /* Expand the argument.  */
  char *p3 = argv[0];
  char *p2=0;
  int doneany=0;
  unsigned int len=0;
  char *p=0;
  int is_basename= streq (funcname, "basename");
  int is_dir= !is_basename;

  while ((p2 = find_next_token (&p3, &len)) != 0)
	{
	  p = p2 + len;
	  while (p >= p2 && (!is_basename  || *p != '.'))
	    {
	      if (IS_PATHSEP (*p))
		break;
	      	    --p;
	    }

	  if (p >= p2 && (is_dir))
	    o = variable_buffer_output (o, p2, ++p - p2);
	  else if (p >= p2 && (*p == '.'))
	    o = variable_buffer_output (o, p2, p - p2);
#ifdef HAVE_DOS_PATHS
	/* Handle the "d:foobar" case */
	  else if (p2[0] && p2[1] == ':' && is_dir)
	    o = variable_buffer_output (o, p2, 2);
#endif
	  else if (is_dir)
#ifdef VMS
	    o = variable_buffer_output (o, "[]", 2);
#else
#ifndef _AMIGA
	    o = variable_buffer_output (o, "./", 2);
#else
	    ; /* Just a nop...  */
#endif /* AMIGA */
#endif /* !VMS */
	  else
	    /* The entire name is the basename.  */
	    o = variable_buffer_output (o, p2, len);

	  o = variable_buffer_output (o, " ", 1);
	  doneany = 1;
	}
      if (doneany)
	/* Kill last space.  */
	--o;


 return o;
}

static char *
func_addsuffix_addprefix (char *o, char **argv, const char *funcname)
{
  int fixlen = strlen (argv[0]);
  char *list_iterator = argv[1];
  int is_addprefix = streq (funcname, "addprefix");
  int is_addsuffix = !is_addprefix;

  int doneany = 0;
  char *p;
  unsigned int len;

  while ((p = find_next_token (&list_iterator, &len)) != 0)
    {
      if (is_addprefix)
	o = variable_buffer_output (o, argv[0], fixlen);
      o = variable_buffer_output (o, p, len);
      if (is_addsuffix)
	o = variable_buffer_output (o, argv[0], fixlen);
      o = variable_buffer_output (o, " ", 1);
      doneany = 1;
    }

  if (doneany)
    /* Kill last space.  */
    --o;

  return o;
}

static char *
func_subst (char *o, char **argv, const char *funcname)
{
  o = subst_expand (o, argv[2], argv[0], argv[1], strlen (argv[0]),
		    strlen (argv[1]), 0, 0);

  return o;
}


static char *
func_firstword (char *o, char **argv, const char *funcname)
{
  unsigned int i;
  char *words = argv[0];    /* Use a temp variable for find_next_token */
  char *p = find_next_token (&words, &i);

  if (p != 0)
    o = variable_buffer_output (o, p, i);

  return o;
}


static char *
func_words (char *o, char **argv, const char *funcname)
{
  int i = 0;
  char *word_iterator = argv[0];
  char buf[20];

  while (find_next_token (&word_iterator, (unsigned int *) 0) != 0)
    ++i;

  sprintf (buf, "%d", i);
  o = variable_buffer_output (o, buf, strlen (buf));


  return o;
}

char *
strip_whitespace (char **begpp, char **endpp)
{
  while (isspace ((unsigned char)**begpp) && *begpp <= *endpp)
    (*begpp) ++;
  while (isspace ((unsigned char)**endpp) && *endpp >= *begpp)
    (*endpp) --;
  return *begpp;
}

int
is_numeric (char *p)
{
  char *end = p + strlen (p) - 1;
  char *beg = p;
  strip_whitespace (&p, &end);

  while (p <= end)
    if (!ISDIGIT (*(p++)))  /* ISDIGIT only evals its arg once: see make.h.  */
      return 0;

  return (end - beg >= 0);
}

void
check_numeric (char *s, char *message)
{
  if (!is_numeric (s))
    fatal (reading_file, message);
}



static char *
func_word (char *o, char **argv, const char *funcname)
{
  char *end_p=0;
  int i=0;
  char *p=0;

  /* Check the first argument.  */
  check_numeric (argv[0], _("non-numeric first argument to `word' function"));
  i =  atoi (argv[0]);

  if (i == 0)
    fatal (reading_file, _("first argument to `word' function must be greater than 0"));


  end_p = argv[1];
  while ((p = find_next_token (&end_p, 0)) != 0)
    if (--i == 0)
      break;

  if (i == 0)
    o = variable_buffer_output (o, p, end_p - p);

  return o;
}

static char *
func_wordlist (char *o, char **argv, const char *funcname)
{
  int start, count;

  /* Check the arguments.  */
  check_numeric (argv[0],
		 _("non-numeric first argument to `wordlist' function"));
  check_numeric (argv[1],
		 _("non-numeric second argument to `wordlist' function"));

  start = atoi (argv[0]);
  count = atoi (argv[1]) - start + 1;

  if (count > 0)
    {
      char *p;
      char *end_p = argv[2];

      /* Find the beginning of the "start"th word.  */
      while (((p = find_next_token (&end_p, 0)) != 0) && --start)
        ;

      if (p)
        {
          /* Find the end of the "count"th word from start.  */
          while (--count && (find_next_token (&end_p, 0) != 0))
            ;

          /* Return the stuff in the middle.  */
          o = variable_buffer_output (o, p, end_p - p);
        }
    }

  return o;
}

static char*
func_findstring (char *o, char **argv, const char *funcname)
{
  /* Find the first occurrence of the first string in the second.  */
  int i = strlen (argv[0]);
  if (sindex (argv[1], 0, argv[0], i) != 0)
    o = variable_buffer_output (o, argv[0], i);

  return o;
}

static char *
func_foreach (char *o, char **argv, const char *funcname)
{
  /* expand only the first two.  */
  char *varname = expand_argument (argv[0], NULL);
  char *list = expand_argument (argv[1], NULL);
  char *body = argv[2];

  int doneany = 0;
  char *list_iterator = list;
  char *p;
  unsigned int len;
  register struct variable *var;

  push_new_variable_scope ();
  var = define_variable (varname, strlen (varname), "", o_automatic, 0);

  /* loop through LIST,  put the value in VAR and expand BODY */
  while ((p = find_next_token (&list_iterator, &len)) != 0)
    {
      char *result = 0;

      {
	char save = p[len];

	p[len] = '\0';
	free (var->value);
	var->value = (char *) xstrdup ((char*) p);
	p[len] = save;
      }

      result = allocated_variable_expand (body);

      o = variable_buffer_output (o, result, strlen (result));
      o = variable_buffer_output (o, " ", 1);
      doneany = 1;
      free (result);
    }

  if (doneany)
    /* Kill the last space.  */
    --o;

  pop_variable_scope ();
  free (varname);
  free (list);

  return o;
}

struct a_word
{
  struct a_word *next;
  struct a_word *chain;
  char *str;
  int length;
  int matched;
};

static unsigned long
a_word_hash_1 (const void *key)
{
  return_STRING_HASH_1 (((struct a_word const *) key)->str);
}

static unsigned long
a_word_hash_2 (const void *key)
{
  return_STRING_HASH_2 (((struct a_word const *) key)->str);
}

static int
a_word_hash_cmp (const void *x, const void *y)
{
  int result = ((struct a_word const *) x)->length - ((struct a_word const *) y)->length;
  if (result)
    return result;
  return_STRING_COMPARE (((struct a_word const *) x)->str,
			 ((struct a_word const *) y)->str);
}

struct a_pattern
{
  struct a_pattern *next;
  char *str;
  char *percent;
  int length;
  int save_c;
};

static char *
func_filter_filterout (char *o, char **argv, const char *funcname)
{
  struct a_word *wordhead;
  struct a_word **wordtail;
  struct a_word *wp;
  struct a_pattern *pathead;
  struct a_pattern **pattail;
  struct a_pattern *pp;

  struct hash_table a_word_table;
  int is_filter = streq (funcname, "filter");
  char *pat_iterator = argv[0];
  char *word_iterator = argv[1];
  int literals = 0;
  int words = 0;
  int hashing = 0;
  char *p;
  unsigned int len;

  /* Chop ARGV[0] up into patterns to match against the words.  */

  pattail = &pathead;
  while ((p = find_next_token (&pat_iterator, &len)) != 0)
    {
      struct a_pattern *pat = (struct a_pattern *) alloca (sizeof (struct a_pattern));

      *pattail = pat;
      pattail = &pat->next;

      if (*pat_iterator != '\0')
	++pat_iterator;

      pat->str = p;
      pat->length = len;
      pat->save_c = p[len];
      p[len] = '\0';
      pat->percent = find_percent (p);
      if (pat->percent == 0)
	literals++;
    }
  *pattail = 0;

  /* Chop ARGV[1] up into words to match against the patterns.  */

  wordtail = &wordhead;
  while ((p = find_next_token (&word_iterator, &len)) != 0)
    {
      struct a_word *word = (struct a_word *) alloca (sizeof (struct a_word));

      *wordtail = word;
      wordtail = &word->next;

      if (*word_iterator != '\0')
	++word_iterator;

      p[len] = '\0';
      word->str = p;
      word->length = len;
      word->matched = 0;
      word->chain = 0;
      words++;
    }
  *wordtail = 0;

  /* Only use a hash table if arg list lengths justifies the cost.  */
  hashing = (literals >= 2 && (literals * words) >= 10);
  if (hashing)
    {
      hash_init (&a_word_table, words, a_word_hash_1, a_word_hash_2, a_word_hash_cmp);
      for (wp = wordhead; wp != 0; wp = wp->next)
	{
	  struct a_word *owp = hash_insert (&a_word_table, wp);
	  if (owp)
	    wp->chain = owp;
	}
    }

  if (words)
    {
      int doneany = 0;

      /* Run each pattern through the words, killing words.  */
      for (pp = pathead; pp != 0; pp = pp->next)
	{
	  if (pp->percent)
	    for (wp = wordhead; wp != 0; wp = wp->next)
	      wp->matched |= pattern_matches (pp->str, pp->percent, wp->str);
	  else if (hashing)
	    {
	      struct a_word a_word_key;
	      a_word_key.str = pp->str;
	      a_word_key.length = pp->length;
	      wp = (struct a_word *) hash_find_item (&a_word_table, &a_word_key);
	      while (wp)
		{
		  wp->matched |= 1;
		  wp = wp->chain;
		}
	    }
	  else
	    for (wp = wordhead; wp != 0; wp = wp->next)
	      wp->matched |= (wp->length == pp->length
			      && strneq (pp->str, wp->str, wp->length));
	}

      /* Output the words that matched (or didn't, for filter-out).  */
      for (wp = wordhead; wp != 0; wp = wp->next)
	if (is_filter ? wp->matched : !wp->matched)
	  {
	    o = variable_buffer_output (o, wp->str, strlen (wp->str));
	    o = variable_buffer_output (o, " ", 1);
	    doneany = 1;
	  }

      if (doneany)
	/* Kill the last space.  */
	--o;
    }

  for (pp = pathead; pp != 0; pp = pp->next)
    pp->str[pp->length] = pp->save_c;

  if (hashing)
    hash_free (&a_word_table, 0);

  return o;
}


static char *
func_strip (char *o, char **argv, const char *funcname)
{
  char *p = argv[0];
  int doneany =0;

  while (*p != '\0')
    {
      int i=0;
      char *word_start=0;

      while (isspace ((unsigned char)*p))
	++p;
      word_start = p;
      for (i=0; *p != '\0' && !isspace ((unsigned char)*p); ++p, ++i)
	{}
      if (!i)
	break;
      o = variable_buffer_output (o, word_start, i);
      o = variable_buffer_output (o, " ", 1);
      doneany = 1;
    }

  if (doneany)
    /* Kill the last space.  */
    --o;
  return o;
}

/*
  Print a warning or fatal message.
*/
static char *
func_error (char *o, char **argv, const char *funcname)
{
  char **argvp;
  char *msg, *p;
  int len;

  /* The arguments will be broken on commas.  Rather than create yet
     another special case where function arguments aren't broken up,
     just create a format string that puts them back together.  */
  for (len=0, argvp=argv; *argvp != 0; ++argvp)
    len += strlen (*argvp) + 2;

  p = msg = (char *) alloca (len + 1);

  for (argvp=argv; argvp[1] != 0; ++argvp)
    {
      strcpy (p, *argvp);
      p += strlen (*argvp);
      *(p++) = ',';
      *(p++) = ' ';
    }
  strcpy (p, *argvp);

  if (*funcname == 'e')
    fatal (reading_file, "%s", msg);

  /* The warning function expands to the empty string.  */
  error (reading_file, "%s", msg);

  return o;
}


/*
  chop argv[0] into words, and sort them.
 */
static char *
func_sort (char *o, char **argv, const char *funcname)
{
  char **words = 0;
  int nwords = 0;
  register int wordi = 0;

  /* Chop ARGV[0] into words and put them in WORDS.  */
  char *t = argv[0];
  char *p;
  unsigned int len;
  int i;

  while ((p = find_next_token (&t, &len)) != 0)
    {
      if (wordi >= nwords - 1)
	{
	  nwords = (2 * nwords) + 5;
	  words = (char **) xrealloc ((char *) words,
				      nwords * sizeof (char *));
	}
      words[wordi++] = savestring (p, len);
    }

  if (!wordi)
    return o;

  /* Now sort the list of words.  */
  qsort ((char *) words, wordi, sizeof (char *), alpha_compare);

  /* Now write the sorted list.  */
  for (i = 0; i < wordi; ++i)
    {
      len = strlen (words[i]);
      if (i == wordi - 1 || strlen (words[i + 1]) != len
          || strcmp (words[i], words[i + 1]))
        {
          o = variable_buffer_output (o, words[i], len);
          o = variable_buffer_output (o, " ", 1);
        }
      free (words[i]);
    }
  /* Kill the last space.  */
  --o;

  free (words);

  return o;
}

/*
  $(if condition,true-part[,false-part])

  CONDITION is false iff it evaluates to an empty string.  White
  space before and after condition are stripped before evaluation.

  If CONDITION is true, then TRUE-PART is evaluated, otherwise FALSE-PART is
  evaluated (if it exists).  Because only one of the two PARTs is evaluated,
  you can use $(if ...) to create side-effects (with $(shell ...), for
  example).
*/

static char *
func_if (char *o, char **argv, const char *funcname)
{
  char *begp = argv[0];
  char *endp = begp + strlen (argv[0]);
  int result = 0;

  /* Find the result of the condition: if we have a value, and it's not
     empty, the condition is true.  If we don't have a value, or it's the
     empty string, then it's false.  */

  strip_whitespace (&begp, &endp);

  if (begp < endp)
    {
      char *expansion = expand_argument (begp, NULL);

      result = strlen (expansion);
      free (expansion);
    }

  /* If the result is true (1) we want to eval the first argument, and if
     it's false (0) we want to eval the second.  If the argument doesn't
     exist we do nothing, otherwise expand it and add to the buffer.  */

  argv += 1 + !result;

  if (argv[0])
    {
      char *expansion;

      expansion = expand_argument (argv[0], NULL);

      o = variable_buffer_output (o, expansion, strlen (expansion));

      free (expansion);
    }

  return o;
}

static char *
func_wildcard (char *o, char **argv, const char *funcname)
{

#ifdef _AMIGA
   o = wildcard_expansion (argv[0], o);
#else
   char *p = string_glob (argv[0]);
   o = variable_buffer_output (o, p, strlen (p));
#endif
   return o;
}

/*
  $(eval <makefile string>)

  Always resolves to the empty string.

  Treat the arguments as a segment of makefile, and parse them.
*/

static char *
func_eval (char *o, char **argv, const char *funcname)
{
  eval_buffer (argv[0]);

  return o;
}


static char *
func_value (char *o, char **argv, const char *funcname)
{
  /* Look up the variable.  */
  struct variable *v = lookup_variable (argv[0], strlen (argv[0]));

  /* Copy its value into the output buffer without expanding it.  */
  if (v)
    o = variable_buffer_output (o, v->value, strlen(v->value));

  return o;
}

/*
  \r  is replaced on UNIX as well. Is this desirable?
 */
void
fold_newlines (char *buffer, int *length)
{
  char *dst = buffer;
  char *src = buffer;
  char *last_nonnl = buffer -1;
  src[*length] = 0;
  for (; *src != '\0'; ++src)
    {
      if (src[0] == '\r' && src[1] == '\n')
	continue;
      if (*src == '\n')
	{
	  *dst++ = ' ';
	}
      else
	{
	  last_nonnl = dst;
	  *dst++ = *src;
	}
    }
  *(++last_nonnl) = '\0';
  *length = last_nonnl - buffer;
}



int shell_function_pid = 0, shell_function_completed;


#ifdef WINDOWS32
/*untested*/

#include <windows.h>
#include <io.h>
#include "sub_proc.h"


void
windows32_openpipe (int *pipedes, int *pid_p, char **command_argv, char **envp)
{
  SECURITY_ATTRIBUTES saAttr;
  HANDLE hIn;
  HANDLE hErr;
  HANDLE hChildOutRd;
  HANDLE hChildOutWr;
  HANDLE hProcess;


  saAttr.nLength = sizeof (SECURITY_ATTRIBUTES);
  saAttr.bInheritHandle = TRUE;
  saAttr.lpSecurityDescriptor = NULL;

  if (DuplicateHandle (GetCurrentProcess(),
		      GetStdHandle(STD_INPUT_HANDLE),
		      GetCurrentProcess(),
		      &hIn,
		      0,
		      TRUE,
		      DUPLICATE_SAME_ACCESS) == FALSE) {
    fatal (NILF, _("create_child_process: DuplicateHandle(In) failed (e=%d)\n"),
	   GetLastError());

  }
  if (DuplicateHandle(GetCurrentProcess(),
		      GetStdHandle(STD_ERROR_HANDLE),
		      GetCurrentProcess(),
		      &hErr,
		      0,
		      TRUE,
		      DUPLICATE_SAME_ACCESS) == FALSE) {
    fatal (NILF, _("create_child_process: DuplicateHandle(Err) failed (e=%d)\n"),
	   GetLastError());
  }

  if (!CreatePipe(&hChildOutRd, &hChildOutWr, &saAttr, 0))
    fatal (NILF, _("CreatePipe() failed (e=%d)\n"), GetLastError());

  hProcess = process_init_fd(hIn, hChildOutWr, hErr);

  if (!hProcess)
    fatal (NILF, _("windows32_openpipe (): process_init_fd() failed\n"));

  /* make sure that CreateProcess() has Path it needs */
  sync_Path_environment();

  if (!process_begin(hProcess, command_argv, envp, command_argv[0], NULL)) {
    /* register process for wait */
    process_register(hProcess);

    /* set the pid for returning to caller */
    *pid_p = (int) hProcess;

  /* set up to read data from child */
  pipedes[0] = _open_osfhandle((long) hChildOutRd, O_RDONLY);

  /* this will be closed almost right away */
  pipedes[1] = _open_osfhandle((long) hChildOutWr, O_APPEND);
  } else {
    /* reap/cleanup the failed process */
	process_cleanup(hProcess);

    /* close handles which were duplicated, they weren't used */
	CloseHandle(hIn);
	CloseHandle(hErr);

	/* close pipe handles, they won't be used */
	CloseHandle(hChildOutRd);
	CloseHandle(hChildOutWr);

    /* set status for return */
    pipedes[0] = pipedes[1] = -1;
    *pid_p = -1;
  }
}
#endif


#ifdef __MSDOS__
FILE *
msdos_openpipe (int* pipedes, int *pidp, char *text)
{
  FILE *fpipe=0;
  /* MSDOS can't fork, but it has `popen'.  */
  struct variable *sh = lookup_variable ("SHELL", 5);
  int e;
  extern int dos_command_running, dos_status;

  /* Make sure not to bother processing an empty line.  */
  while (isblank ((unsigned char)*text))
    ++text;
  if (*text == '\0')
    return 0;

  if (sh)
    {
      char buf[PATH_MAX + 7];
      /* This makes sure $SHELL value is used by $(shell), even
	 though the target environment is not passed to it.  */
      sprintf (buf, "SHELL=%s", sh->value);
      putenv (buf);
    }

  e = errno;
  errno = 0;
  dos_command_running = 1;
  dos_status = 0;
  /* If dos_status becomes non-zero, it means the child process
     was interrupted by a signal, like SIGINT or SIGQUIT.  See
     fatal_error_signal in commands.c.  */
  fpipe = popen (text, "rt");
  dos_command_running = 0;
  if (!fpipe || dos_status)
    {
      pipedes[0] = -1;
      *pidp = -1;
      if (dos_status)
	errno = EINTR;
      else if (errno == 0)
	errno = ENOMEM;
      shell_function_completed = -1;
    }
  else
    {
      pipedes[0] = fileno (fpipe);
      *pidp = 42; /* Yes, the Meaning of Life, the Universe, and Everything! */
      errno = e;
      shell_function_completed = 1;
    }
  return fpipe;
}
#endif

/*
  Do shell spawning, with the naughty bits for different OSes.
 */

#ifdef VMS

/* VMS can't do $(shell ...)  */
#define func_shell 0

#else
#ifndef _AMIGA
static char *
func_shell (char *o, char **argv, const char *funcname)
{
  char* batch_filename = NULL;
  int i;

#ifdef __MSDOS__
  FILE *fpipe;
#endif
  char **command_argv;
  char *error_prefix;
  char **envp;
  int pipedes[2];
  int pid;

#ifndef __MSDOS__
  /* Construct the argument list.  */
  command_argv = construct_command_argv (argv[0],
					 (char **) NULL, (struct file *) 0,
                                         &batch_filename);
  if (command_argv == 0)
    return o;
#endif

  /* Using a target environment for `shell' loses in cases like:
     export var = $(shell echo foobie)
     because target_environment hits a loop trying to expand $(var)
     to put it in the environment.  This is even more confusing when
     var was not explicitly exported, but just appeared in the
     calling environment.  */

  envp = environ;

  /* For error messages.  */
  if (reading_file != 0)
    {
      error_prefix = (char *) alloca (strlen (reading_file->filenm)+11+4);
      sprintf (error_prefix,
	       "%s:%lu: ", reading_file->filenm, reading_file->lineno);
    }
  else
    error_prefix = "";

#ifdef WINDOWS32
  windows32_openpipe (pipedes, &pid, command_argv, envp);

  if (pipedes[0] < 0) {
	/* open of the pipe failed, mark as failed execution */
    shell_function_completed = -1;

	return o;
  } else
#else /* WINDOWS32 */

# ifdef __MSDOS__
  fpipe = msdos_openpipe (pipedes, &pid, argv[0]);
  if (pipedes[0] < 0)
    {
      perror_with_name (error_prefix, "pipe");
      return o;
    }
# else
  if (pipe (pipedes) < 0)
    {
      perror_with_name (error_prefix, "pipe");
      return o;
    }

  pid = vfork ();
  if (pid < 0)
    perror_with_name (error_prefix, "fork");
  else if (pid == 0)
    child_execute_job (0, pipedes[1], command_argv, envp);
  else
# endif /* ! __MSDOS__ */

#endif /* WINDOWS32 */
    {
      /* We are the parent.  */

      char *buffer;
      unsigned int maxlen;
      int cc;

      /* Record the PID for reap_children.  */
      shell_function_pid = pid;
#ifndef  __MSDOS__
      shell_function_completed = 0;

      /* Free the storage only the child needed.  */
      free (command_argv[0]);
      free ((char *) command_argv);

      /* Close the write side of the pipe.  */
      (void) close (pipedes[1]);
#endif

      /* Set up and read from the pipe.  */

      maxlen = 200;
      buffer = (char *) xmalloc (maxlen + 1);

      /* Read from the pipe until it gets EOF.  */
      for (i = 0; ; i += cc)
	{
	  if (i == maxlen)
	    {
	      maxlen += 512;
	      buffer = (char *) xrealloc (buffer, maxlen + 1);
	    }

	  cc = read (pipedes[0], &buffer[i], maxlen - i);
	  if (cc <= 0)
	    break;
	}
      buffer[i] = '\0';

      /* Close the read side of the pipe.  */
#ifdef  __MSDOS__
      if (fpipe)
	(void) pclose (fpipe);
#else
      (void) close (pipedes[0]);
#endif

      /* Loop until child_handler sets shell_function_completed
	 to the status of our child shell.  */
      while (shell_function_completed == 0)
	reap_children (1, 0);

      if (batch_filename) {
	DB (DB_VERBOSE, (_("Cleaning up temporary batch file %s\n"),
                       batch_filename));
	remove (batch_filename);
	free (batch_filename);
      }
      shell_function_pid = 0;

      /* The child_handler function will set shell_function_completed
	 to 1 when the child dies normally, or to -1 if it
	 dies with status 127, which is most likely an exec fail.  */

      if (shell_function_completed == -1)
	{
	  /* This most likely means that the execvp failed,
	     so we should just write out the error message
	     that came in over the pipe from the child.  */
	  fputs (buffer, stderr);
	  fflush (stderr);
	}
      else
	{
	  /* The child finished normally.  Replace all
	     newlines in its output with spaces, and put
	     that in the variable output buffer.  */
	  fold_newlines (buffer, &i);
	  o = variable_buffer_output (o, buffer, i);
	}

      free (buffer);
    }

  return o;
}

#else	/* _AMIGA */

/* Do the Amiga version of func_shell.  */

static char *
func_shell (char *o, char **argv, const char *funcname)
{
  /* Amiga can't fork nor spawn, but I can start a program with
     redirection of my choice.  However, this means that we
     don't have an opportunity to reopen stdout to trap it.  Thus,
     we save our own stdout onto a new descriptor and dup a temp
     file's descriptor onto our stdout temporarily.  After we
     spawn the shell program, we dup our own stdout back to the
     stdout descriptor.  The buffer reading is the same as above,
     except that we're now reading from a file.  */

#include <dos/dos.h>
#include <proto/dos.h>

  BPTR child_stdout;
  char tmp_output[FILENAME_MAX];
  unsigned int maxlen = 200;
  int cc, i;
  char * buffer, * ptr;
  char ** aptr;
  int len = 0;
  char* batch_filename = NULL;

  /* Construct the argument list.  */
  command_argv = construct_command_argv (argv[0], (char **) NULL,
                                         (struct file *) 0, &batch_filename);
  if (command_argv == 0)
    return o;

  /* Note the mktemp() is a security hole, but this only runs on Amiga.
     Ideally we would use main.c:open_tmpfile(), but this uses a special
     Open(), not fopen(), and I'm not familiar enough with the code to mess
     with it.  */
  strcpy (tmp_output, "t:MakeshXXXXXXXX");
  mktemp (tmp_output);
  child_stdout = Open (tmp_output, MODE_NEWFILE);

  for (aptr=command_argv; *aptr; aptr++)
    len += strlen (*aptr) + 1;

  buffer = xmalloc (len + 1);
  ptr = buffer;

  for (aptr=command_argv; *aptr; aptr++)
    {
      strcpy (ptr, *aptr);
      ptr += strlen (ptr) + 1;
      *ptr ++ = ' ';
      *ptr = 0;
    }

  ptr[-1] = '\n';

  Execute (buffer, NULL, child_stdout);
  free (buffer);

  Close (child_stdout);

  child_stdout = Open (tmp_output, MODE_OLDFILE);

  buffer = xmalloc (maxlen);
  i = 0;
  do
    {
      if (i == maxlen)
	{
	  maxlen += 512;
	  buffer = (char *) xrealloc (buffer, maxlen + 1);
	}

      cc = Read (child_stdout, &buffer[i], maxlen - i);
      if (cc > 0)
	i += cc;
    } while (cc > 0);

  Close (child_stdout);

  fold_newlines (buffer, &i);
  o = variable_buffer_output (o, buffer, i);
  free (buffer);
  return o;
}
#endif  /* _AMIGA */
#endif  /* !VMS */

#ifdef EXPERIMENTAL

/*
  equality. Return is string-boolean, ie, the empty string is false.
 */
static char *
func_eq (char* o, char **argv, char *funcname)
{
  int result = ! strcmp (argv[0], argv[1]);
  o = variable_buffer_output (o,  result ? "1" : "", result);
  return o;
}


/*
  string-boolean not operator.
 */
static char *
func_not (char* o, char **argv, char *funcname)
{
  char * s = argv[0];
  int result = 0;
  while (isspace ((unsigned char)*s))
    s++;
  result = ! (*s);
  o = variable_buffer_output (o,  result ? "1" : "", result);
  return o;
}
#endif


/* Lookup table for builtin functions.

   This doesn't have to be sorted; we use a straight lookup.  We might gain
   some efficiency by moving most often used functions to the start of the
   table.

   If MAXIMUM_ARGS is 0, that means there is no maximum and all
   comma-separated values are treated as arguments.

   EXPAND_ARGS means that all arguments should be expanded before invocation.
   Functions that do namespace tricks (foreach) don't automatically expand.  */

static char *func_call PARAMS ((char *o, char **argv, const char *funcname));


static struct function_table_entry function_table_init[] =
{
 /* Name/size */                    /* MIN MAX EXP? Function */
  { STRING_SIZE_TUPLE("addprefix"),     2,  2,  1,  func_addsuffix_addprefix},
  { STRING_SIZE_TUPLE("addsuffix"),     2,  2,  1,  func_addsuffix_addprefix},
  { STRING_SIZE_TUPLE("basename"),      0,  1,  1,  func_basename_dir},
  { STRING_SIZE_TUPLE("dir"),           0,  1,  1,  func_basename_dir},
  { STRING_SIZE_TUPLE("notdir"),        0,  1,  1,  func_notdir_suffix},
  { STRING_SIZE_TUPLE("subst"),         3,  3,  1,  func_subst},
  { STRING_SIZE_TUPLE("suffix"),        0,  1,  1,  func_notdir_suffix},
  { STRING_SIZE_TUPLE("filter"),        2,  2,  1,  func_filter_filterout},
  { STRING_SIZE_TUPLE("filter-out"),    2,  2,  1,  func_filter_filterout},
  { STRING_SIZE_TUPLE("findstring"),    2,  2,  1,  func_findstring},
  { STRING_SIZE_TUPLE("firstword"),     0,  1,  1,  func_firstword},
  { STRING_SIZE_TUPLE("join"),          2,  2,  1,  func_join},
  { STRING_SIZE_TUPLE("patsubst"),      3,  3,  1,  func_patsubst},
  { STRING_SIZE_TUPLE("shell"),         0,  1,  1,  func_shell},
  { STRING_SIZE_TUPLE("sort"),          0,  1,  1,  func_sort},
  { STRING_SIZE_TUPLE("strip"),         0,  1,  1,  func_strip},
  { STRING_SIZE_TUPLE("wildcard"),      0,  1,  1,  func_wildcard},
  { STRING_SIZE_TUPLE("word"),          2,  2,  1,  func_word},
  { STRING_SIZE_TUPLE("wordlist"),      3,  3,  1,  func_wordlist},
  { STRING_SIZE_TUPLE("words"),         0,  1,  1,  func_words},
  { STRING_SIZE_TUPLE("origin"),        0,  1,  1,  func_origin},
  { STRING_SIZE_TUPLE("foreach"),       3,  3,  0,  func_foreach},
  { STRING_SIZE_TUPLE("call"),          1,  0,  1,  func_call},
  { STRING_SIZE_TUPLE("error"),         0,  1,  1,  func_error},
  { STRING_SIZE_TUPLE("warning"),       0,  1,  1,  func_error},
  { STRING_SIZE_TUPLE("if"),            2,  3,  0,  func_if},
  { STRING_SIZE_TUPLE("value"),         0,  1,  1,  func_value},
  { STRING_SIZE_TUPLE("eval"),          0,  1,  1,  func_eval},
#ifdef EXPERIMENTAL
  { STRING_SIZE_TUPLE("eq"),            2,  2,  1,  func_eq},
  { STRING_SIZE_TUPLE("not"),           0,  1,  1,  func_not},
#endif
};

#define FUNCTION_TABLE_ENTRIES (sizeof (function_table_init) / sizeof (struct function_table_entry))


/* These must come after the definition of function_table.  */

static char *
expand_builtin_function (char *o, int argc, char **argv,
                         const struct function_table_entry *entry_p)
{
  if (argc < (int)entry_p->minimum_args)
    fatal (reading_file,
           _("Insufficient number of arguments (%d) to function `%s'"),
           argc, entry_p->name);

  /* I suppose technically some function could do something with no
     arguments, but so far none do, so just test it for all functions here
     rather than in each one.  We can change it later if necessary.  */

  if (!argc)
    return o;

  if (!entry_p->func_ptr)
    fatal (reading_file, _("Unimplemented on this platform: function `%s'"),
           entry_p->name);

  return entry_p->func_ptr (o, argv, entry_p->name);
}

/* Check for a function invocation in *STRINGP.  *STRINGP points at the
   opening ( or { and is not null-terminated.  If a function invocation
   is found, expand it into the buffer at *OP, updating *OP, incrementing
   *STRINGP past the reference and returning nonzero.  If not, return zero.  */

int
handle_function (char **op, char **stringp)
{
  const struct function_table_entry *entry_p;
  char openparen = (*stringp)[0];
  char closeparen = openparen == '(' ? ')' : '}';
  char *beg;
  char *end;
  int count = 0;
  register char *p;
  char **argv, **argvp;
  int nargs;

  beg = *stringp + 1;

  entry_p = lookup_function (beg);

  if (!entry_p)
    return 0;

  /* We found a builtin function.  Find the beginning of its arguments (skip
     whitespace after the name).  */

  beg = next_token (beg + entry_p->len);

  /* Find the end of the function invocation, counting nested use of
     whichever kind of parens we use.  Since we're looking, count commas
     to get a rough estimate of how many arguments we might have.  The
     count might be high, but it'll never be low.  */

  for (nargs=1, end=beg; *end != '\0'; ++end)
    if (*end == ',')
      ++nargs;
    else if (*end == openparen)
      ++count;
    else if (*end == closeparen && --count < 0)
      break;

  if (count >= 0)
    fatal (reading_file,
	   _("unterminated call to function `%s': missing `%c'"),
	   entry_p->name, closeparen);

  *stringp = end;

  /* Get some memory to store the arg pointers.  */
  argvp = argv = (char **) alloca (sizeof (char *) * (nargs + 2));

  /* Chop the string into arguments, then a nul.  As soon as we hit
     MAXIMUM_ARGS (if it's >0) assume the rest of the string is part of the
     last argument.

     If we're expanding, store pointers to the expansion of each one.  If
     not, make a duplicate of the string and point into that, nul-terminating
     each argument.  */

  if (!entry_p->expand_args)
    {
      int len = end - beg;

      p = xmalloc (len+1);
      memcpy (p, beg, len);
      p[len] = '\0';
      beg = p;
      end = beg + len;
    }

  for (p=beg, nargs=0; p <= end; ++argvp)
    {
      char *next;

      ++nargs;

      if (nargs == entry_p->maximum_args
          || (! (next = find_next_argument (openparen, closeparen, p, end))))
        next = end;

      if (entry_p->expand_args)
        *argvp = expand_argument (p, next);
      else
        {
          *argvp = p;
          *next = '\0';
        }

      p = next + 1;
    }
  *argvp = NULL;

  /* Finally!  Run the function...  */
  *op = expand_builtin_function (*op, nargs, argv, entry_p);

  /* Free memory.  */
  if (entry_p->expand_args)
    for (argvp=argv; *argvp != 0; ++argvp)
      free (*argvp);
  else
    free (beg);

  return 1;
}


/* User-defined functions.  Expand the first argument as either a builtin
   function or a make variable, in the context of the rest of the arguments
   assigned to $1, $2, ... $N.  $0 is the name of the function.  */

static char *
func_call (char *o, char **argv, const char *funcname)
{
  char *fname;
  char *cp;
  char *body;
  int flen;
  int i;
  const struct function_table_entry *entry_p;
  struct variable *v;

  /* There is no way to define a variable with a space in the name, so strip
     leading and trailing whitespace as a favor to the user.  */
  fname = argv[0];
  while (*fname != '\0' && isspace ((unsigned char)*fname))
    ++fname;

  cp = fname + strlen (fname) - 1;
  while (cp > fname && isspace ((unsigned char)*cp))
    --cp;
  cp[1] = '\0';

  /* Calling nothing is a no-op */
  if (*fname == '\0')
    return o;

  /* Are we invoking a builtin function?  */

  entry_p = lookup_function (fname);

  if (entry_p)
    {
      /* How many arguments do we have?  */
      for (i=0; argv[i+1]; ++i)
  	;

      return expand_builtin_function (o, i, argv+1, entry_p);
    }

  /* Not a builtin, so the first argument is the name of a variable to be
     expanded and interpreted as a function.  Find it.  */
  flen = strlen (fname);

  v = lookup_variable (fname, flen);

  if (v == 0)
    warn_undefined (fname, flen);

  if (v == 0 || *v->value == '\0')
    return o;

  body = (char *) alloca (flen + 4);
  body[0] = '$';
  body[1] = '(';
  memcpy (body + 2, fname, flen);
  body[flen+2] = ')';
  body[flen+3] = '\0';

  /* Set up arguments $(1) .. $(N).  $(0) is the function name.  */

  push_new_variable_scope ();

  for (i=0; *argv; ++i, ++argv)
    {
      char num[11];

      sprintf (num, "%d", i);
      define_variable (num, strlen (num), *argv, o_automatic, 0);
    }

  /* Expand the body in the context of the arguments, adding the result to
     the variable buffer.  */

  v->exp_count = EXP_COUNT_MAX;

  o = variable_expand_string (o, body, flen+3);

  v->exp_count = 0;

  pop_variable_scope ();

  return o + strlen (o);
}

void
hash_init_function_table (void)
{
  hash_init (&function_table, FUNCTION_TABLE_ENTRIES * 2,
	     function_table_entry_hash_1, function_table_entry_hash_2,
	     function_table_entry_hash_cmp);
  hash_load (&function_table, function_table_init,
	     FUNCTION_TABLE_ENTRIES, sizeof (struct function_table_entry));
}