forked from FooBarWidget/rubyenterpriseedition187-248
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathutil.c
3880 lines (3641 loc) · 97 KB
/
util.c
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
/**********************************************************************
util.c -
$Author$
$Date$
created at: Fri Mar 10 17:22:34 JST 1995
Copyright (C) 1993-2008 Yukihiro Matsumoto
**********************************************************************/
#include "ruby.h"
#include <ctype.h>
#include <stdio.h>
#include <errno.h>
#include <math.h>
#include <float.h>
#ifdef _WIN32
#include "missing/file.h"
#endif
#if defined(__CYGWIN32__) || defined(_WIN32)
#include <io.h>
#endif
#include "util.h"
#ifndef HAVE_STRING_H
char *strchr _((char*,char));
#endif
unsigned long
scan_oct(start, len, retlen)
const char *start;
int len;
int *retlen;
{
register const char *s = start;
register unsigned long retval = 0;
while (len-- && *s >= '0' && *s <= '7') {
retval <<= 3;
retval |= *s++ - '0';
}
*retlen = s - start;
return retval;
}
unsigned long
scan_hex(start, len, retlen)
const char *start;
int len;
int *retlen;
{
static const char hexdigit[] = "0123456789abcdef0123456789ABCDEF";
register const char *s = start;
register unsigned long retval = 0;
char *tmp;
while (len-- && *s && (tmp = strchr(hexdigit, *s))) {
retval <<= 4;
retval |= (tmp - hexdigit) & 15;
s++;
}
*retlen = s - start;
return retval;
}
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if defined(HAVE_FCNTL_H)
#include <fcntl.h>
#endif
#ifndef S_ISDIR
# define S_ISDIR(m) ((m & S_IFMT) == S_IFDIR)
#endif
#if defined(MSDOS) || defined(__CYGWIN32__) || defined(_WIN32)
/*
* Copyright (c) 1993, Intergraph Corporation
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the perl README file.
*
* Various Unix compatibility functions and NT specific functions.
*
* Some of this code was derived from the MSDOS port(s) and the OS/2 port.
*
*/
/*
* Suffix appending for in-place editing under MS-DOS and OS/2 (and now NT!).
*
* Here are the rules:
*
* Style 0: Append the suffix exactly as standard perl would do it.
* If the filesystem groks it, use it. (HPFS will always
* grok it. So will NTFS. FAT will rarely accept it.)
*
* Style 1: The suffix begins with a '.'. The extension is replaced.
* If the name matches the original name, use the fallback method.
*
* Style 2: The suffix is a single character, not a '.'. Try to add the
* suffix to the following places, using the first one that works.
* [1] Append to extension.
* [2] Append to filename,
* [3] Replace end of extension,
* [4] Replace end of filename.
* If the name matches the original name, use the fallback method.
*
* Style 3: Any other case: Ignore the suffix completely and use the
* fallback method.
*
* Fallback method: Change the extension to ".$$$". If that matches the
* original name, then change the extension to ".~~~".
*
* If filename is more than 1000 characters long, we die a horrible
* death. Sorry.
*
* The filename restriction is a cheat so that we can use buf[] to store
* assorted temporary goo.
*
* Examples, assuming style 0 failed.
*
* suffix = ".bak" (style 1)
* foo.bar => foo.bak
* foo.bak => foo.$$$ (fallback)
* foo.$$$ => foo.~~~ (fallback)
* makefile => makefile.bak
*
* suffix = "~" (style 2)
* foo.c => foo.c~
* foo.c~ => foo.c~~
* foo.c~~ => foo~.c~~
* foo~.c~~ => foo~~.c~~
* foo~~~~~.c~~ => foo~~~~~.$$$ (fallback)
*
* foo.pas => foo~.pas
* makefile => makefile.~
* longname.fil => longname.fi~
* longname.fi~ => longnam~.fi~
* longnam~.fi~ => longnam~.$$$
*
*/
static int valid_filename(char *s);
static const char suffix1[] = ".$$$";
static const char suffix2[] = ".~~~";
#define ext (&buf[1000])
#define strEQ(s1,s2) (strcmp(s1,s2) == 0)
void
ruby_add_suffix(str, suffix)
VALUE str;
char *suffix;
{
int baselen;
int extlen = strlen(suffix);
char *s, *t, *p;
long slen;
char buf[1024];
if (RSTRING(str)->len > 1000)
rb_fatal("Cannot do inplace edit on long filename (%ld characters)",
RSTRING(str)->len);
#if defined(DJGPP) || defined(__CYGWIN32__) || defined(_WIN32)
/* Style 0 */
slen = RSTRING(str)->len;
rb_str_cat(str, suffix, extlen);
#if defined(DJGPP)
if (_USE_LFN) return;
#else
if (valid_filename(RSTRING(str)->ptr)) return;
#endif
/* Fooey, style 0 failed. Fix str before continuing. */
RSTRING(str)->ptr[RSTRING(str)->len = slen] = '\0';
#endif
slen = extlen;
t = buf; baselen = 0; s = RSTRING(str)->ptr;
while ((*t = *s) && *s != '.') {
baselen++;
if (*s == '\\' || *s == '/') baselen = 0;
s++; t++;
}
p = t;
t = ext; extlen = 0;
while (*t++ = *s++) extlen++;
if (extlen == 0) { ext[0] = '.'; ext[1] = 0; extlen++; }
if (*suffix == '.') { /* Style 1 */
if (strEQ(ext, suffix)) goto fallback;
strcpy(p, suffix);
}
else if (suffix[1] == '\0') { /* Style 2 */
if (extlen < 4) {
ext[extlen] = *suffix;
ext[++extlen] = '\0';
}
else if (baselen < 8) {
*p++ = *suffix;
}
else if (ext[3] != *suffix) {
ext[3] = *suffix;
}
else if (buf[7] != *suffix) {
buf[7] = *suffix;
}
else goto fallback;
strcpy(p, ext);
}
else { /* Style 3: Panic */
fallback:
(void)memcpy(p, strEQ(ext, suffix1) ? suffix2 : suffix1, 5);
}
rb_str_resize(str, strlen(buf));
memcpy(RSTRING(str)->ptr, buf, RSTRING(str)->len);
}
#if defined(__CYGWIN32__) || defined(_WIN32)
#if defined __CYGWIN32__ || defined __MINGW32__
extern int _open(const char *, int, ...);
extern int _close(int);
extern int _unlink(const char *);
#endif
static int
valid_filename(char *s)
{
int fd;
/*
// It doesn't exist, so see if we can open it.
*/
if ((fd = _open(s, O_CREAT|O_EXCL, 0666)) >= 0) {
_close(fd);
_unlink(s); /* don't leave it laying around */
return 1;
}
else if (errno == EEXIST) {
/* if the file exists, then it's a valid filename! */
return 1;
}
return 0;
}
#endif
#endif
#if defined __DJGPP__
#include <dpmi.h>
static char dbcs_table[256];
int
make_dbcs_table()
{
__dpmi_regs r;
struct {
unsigned char start;
unsigned char end;
} vec;
int offset;
memset(&r, 0, sizeof(r));
r.x.ax = 0x6300;
__dpmi_int(0x21, &r);
offset = r.x.ds * 16 + r.x.si;
for (;;) {
int i;
dosmemget(offset, sizeof vec, &vec);
if (!vec.start && !vec.end)
break;
for (i = vec.start; i <= vec.end; i++)
dbcs_table[i] = 1;
offset += 2;
}
}
int
mblen(const char *s, size_t n)
{
static int need_init = 1;
if (need_init) {
make_dbcs_table();
need_init = 0;
}
if (s) {
if (n == 0 || *s == 0)
return 0;
else if (!s[1])
return 1;
return dbcs_table[(unsigned char)*s] + 1;
}
else
return 1;
}
struct PathList {
struct PathList *next;
char *path;
};
struct PathInfo {
struct PathList *head;
int count;
};
static int
push_element(const char *path, VALUE vinfo)
{
struct PathList *p;
struct PathInfo *info = (struct PathInfo *)vinfo;
p = ALLOC(struct PathList);
MEMZERO(p, struct PathList, 1);
p->path = ruby_strdup(path);
p->next = info->head;
info->head = p;
info->count++;
return 0;
}
#include <dirent.h>
int __opendir_flags = __OPENDIR_PRESERVE_CASE;
char **
__crt0_glob_function(char *path)
{
int len = strlen(path);
int i;
char **rv;
char path_buffer[PATH_MAX];
char *buf = path_buffer;
char *p;
struct PathInfo info;
struct PathList *plist;
if (PATH_MAX <= len)
buf = ruby_xmalloc(len + 1);
strncpy(buf, path, len);
buf[len] = '\0';
for (p = buf; *p; p += mblen(p, MB_CUR_MAX))
if (*p == '\\')
*p = '/';
info.count = 0;
info.head = 0;
ruby_glob(buf, 0, push_element, (VALUE)&info);
if (buf != path_buffer)
ruby_xfree(buf);
if (info.count == 0)
return 0;
rv = ruby_xmalloc((info.count + 1) * sizeof (char *));
plist = info.head;
i = 0;
while (plist) {
struct PathList *cur;
rv[i] = plist->path;
cur = plist;
plist = plist->next;
ruby_xfree(cur);
i++;
}
rv[i] = 0;
return rv;
}
#endif
/* mm.c */
#define A ((int*)a)
#define B ((int*)b)
#define C ((int*)c)
#define D ((int*)d)
#define mmprepare(base, size) do {\
if (((long)base & (0x3)) == 0)\
if (size >= 16) mmkind = 1;\
else mmkind = 0;\
else mmkind = -1;\
high = (size & (~0xf));\
low = (size & 0x0c);\
} while (0)\
#define mmarg mmkind, size, high, low
static void mmswap_(a, b, mmarg)
register char *a, *b;
int mmarg;
{
register int s;
if (a == b) return;
if (mmkind >= 0) {
if (mmkind > 0) {
register char *t = a + high;
do {
s = A[0]; A[0] = B[0]; B[0] = s;
s = A[1]; A[1] = B[1]; B[1] = s;
s = A[2]; A[2] = B[2]; B[2] = s;
s = A[3]; A[3] = B[3]; B[3] = s; a += 16; b += 16;
} while (a < t);
}
if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = s;
if (low >= 8) { s = A[1]; A[1] = B[1]; B[1] = s;
if (low == 12) {s = A[2]; A[2] = B[2]; B[2] = s;}}}
}
else {
register char *t = a + size;
do {s = *a; *a++ = *b; *b++ = s;} while (a < t);
}
}
#define mmswap(a,b) mmswap_((a),(b),mmarg)
static void mmrot3_(a, b, c, mmarg)
register char *a, *b, *c;
int mmarg;
{
register int s;
if (mmkind >= 0) {
if (mmkind > 0) {
register char *t = a + high;
do {
s = A[0]; A[0] = B[0]; B[0] = C[0]; C[0] = s;
s = A[1]; A[1] = B[1]; B[1] = C[1]; C[1] = s;
s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;
s = A[3]; A[3] = B[3]; B[3] = C[3]; C[3] = s; a += 16; b += 16; c += 16;
} while (a < t);
}
if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = C[0]; C[0] = s;
if (low >= 8) { s = A[1]; A[1] = B[1]; B[1] = C[1]; C[1] = s;
if (low == 12) {s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;}}}
}
else {
register char *t = a + size;
do {s = *a; *a++ = *b; *b++ = *c; *c++ = s;} while (a < t);
}
}
#define mmrot3(a,b,c) mmrot3_((a),(b),(c),mmarg)
/* qs6.c */
/*****************************************************/
/* */
/* qs6 (Quick sort function) */
/* */
/* by Tomoyuki Kawamura 1995.4.21 */
/* [email protected] */
/*****************************************************/
typedef struct { char *LL, *RR; } stack_node; /* Stack structure for L,l,R,r */
#define PUSH(ll,rr) do { top->LL = (ll); top->RR = (rr); ++top; } while (0) /* Push L,l,R,r */
#define POP(ll,rr) do { --top; ll = top->LL; rr = top->RR; } while (0) /* Pop L,l,R,r */
#define med3(a,b,c) ((*cmp)(a,b,d)<0 ? \
((*cmp)(b,c,d)<0 ? b : ((*cmp)(a,c,d)<0 ? c : a)) : \
((*cmp)(b,c,d)>0 ? b : ((*cmp)(a,c,d)<0 ? a : c)))
void ruby_qsort (base, nel, size, cmp, d)
void* base;
const int nel;
const int size;
int (*cmp)();
void *d;
{
register char *l, *r, *m; /* l,r:left,right group m:median point */
register int t, eq_l, eq_r; /* eq_l: all items in left group are equal to S */
char *L = base; /* left end of curren region */
char *R = (char*)base + size*(nel-1); /* right end of current region */
int chklim = 63; /* threshold of ordering element check */
stack_node stack[32], *top = stack; /* 32 is enough for 32bit CPU */
int mmkind, high, low;
if (nel <= 1) return; /* need not to sort */
mmprepare(base, size);
goto start;
nxt:
if (stack == top) return; /* return if stack is empty */
POP(L,R);
for (;;) {
start:
if (L + size == R) { /* 2 elements */
if ((*cmp)(L,R,d) > 0) mmswap(L,R); goto nxt;
}
l = L; r = R;
t = (r - l + size) / size; /* number of elements */
m = l + size * (t >> 1); /* calculate median value */
if (t >= 60) {
register char *m1;
register char *m3;
if (t >= 200) {
t = size*(t>>3); /* number of bytes in splitting 8 */
{
register char *p1 = l + t;
register char *p2 = p1 + t;
register char *p3 = p2 + t;
m1 = med3(p1, p2, p3);
p1 = m + t;
p2 = p1 + t;
p3 = p2 + t;
m3 = med3(p1, p2, p3);
}
}
else {
t = size*(t>>2); /* number of bytes in splitting 4 */
m1 = l + t;
m3 = m + t;
}
m = med3(m1, m, m3);
}
if ((t = (*cmp)(l,m,d)) < 0) { /*3-5-?*/
if ((t = (*cmp)(m,r,d)) < 0) { /*3-5-7*/
if (chklim && nel >= chklim) { /* check if already ascending order */
char *p;
chklim = 0;
for (p=l; p<r; p+=size) if ((*cmp)(p,p+size,d) > 0) goto fail;
goto nxt;
}
fail: goto loopA; /*3-5-7*/
}
if (t > 0) {
if ((*cmp)(l,r,d) <= 0) {mmswap(m,r); goto loopA;} /*3-5-4*/
mmrot3(r,m,l); goto loopA; /*3-5-2*/
}
goto loopB; /*3-5-5*/
}
if (t > 0) { /*7-5-?*/
if ((t = (*cmp)(m,r,d)) > 0) { /*7-5-3*/
if (chklim && nel >= chklim) { /* check if already ascending order */
char *p;
chklim = 0;
for (p=l; p<r; p+=size) if ((*cmp)(p,p+size,d) < 0) goto fail2;
while (l<r) {mmswap(l,r); l+=size; r-=size;} /* reverse region */
goto nxt;
}
fail2: mmswap(l,r); goto loopA; /*7-5-3*/
}
if (t < 0) {
if ((*cmp)(l,r,d) <= 0) {mmswap(l,m); goto loopB;} /*7-5-8*/
mmrot3(l,m,r); goto loopA; /*7-5-6*/
}
mmswap(l,r); goto loopA; /*7-5-5*/
}
if ((t = (*cmp)(m,r,d)) < 0) {goto loopA;} /*5-5-7*/
if (t > 0) {mmswap(l,r); goto loopB;} /*5-5-3*/
/* determining splitting type in case 5-5-5 */ /*5-5-5*/
for (;;) {
if ((l += size) == r) goto nxt; /*5-5-5*/
if (l == m) continue;
if ((t = (*cmp)(l,m,d)) > 0) {mmswap(l,r); l = L; goto loopA;}/*575-5*/
if (t < 0) {mmswap(L,l); l = L; goto loopB;} /*535-5*/
}
loopA: eq_l = 1; eq_r = 1; /* splitting type A */ /* left <= median < right */
for (;;) {
for (;;) {
if ((l += size) == r)
{l -= size; if (l != m) mmswap(m,l); l -= size; goto fin;}
if (l == m) continue;
if ((t = (*cmp)(l,m,d)) > 0) {eq_r = 0; break;}
if (t < 0) eq_l = 0;
}
for (;;) {
if (l == (r -= size))
{l -= size; if (l != m) mmswap(m,l); l -= size; goto fin;}
if (r == m) {m = l; break;}
if ((t = (*cmp)(r,m,d)) < 0) {eq_l = 0; break;}
if (t == 0) break;
}
mmswap(l,r); /* swap left and right */
}
loopB: eq_l = 1; eq_r = 1; /* splitting type B */ /* left < median <= right */
for (;;) {
for (;;) {
if (l == (r -= size))
{r += size; if (r != m) mmswap(r,m); r += size; goto fin;}
if (r == m) continue;
if ((t = (*cmp)(r,m,d)) < 0) {eq_l = 0; break;}
if (t > 0) eq_r = 0;
}
for (;;) {
if ((l += size) == r)
{r += size; if (r != m) mmswap(r,m); r += size; goto fin;}
if (l == m) {m = r; break;}
if ((t = (*cmp)(l,m,d)) > 0) {eq_r = 0; break;}
if (t == 0) break;
}
mmswap(l,r); /* swap left and right */
}
fin:
if (eq_l == 0) /* need to sort left side */
if (eq_r == 0) /* need to sort right side */
if (l-L < R-r) {PUSH(r,R); R = l;} /* sort left side first */
else {PUSH(L,l); L = r;} /* sort right side first */
else R = l; /* need to sort left side only */
else if (eq_r == 0) L = r; /* need to sort right side only */
else goto nxt; /* need not to sort both sides */
}
}
char *
ruby_strdup(str)
const char *str;
{
char *tmp;
int len = strlen(str) + 1;
tmp = xmalloc(len);
memcpy(tmp, str, len);
return tmp;
}
char *
ruby_getcwd()
{
#ifdef HAVE_GETCWD
int size = 200;
char *buf = xmalloc(size);
while (!getcwd(buf, size)) {
if (errno != ERANGE) {
free(buf);
rb_sys_fail("getcwd");
}
size *= 2;
buf = xrealloc(buf, size);
}
#else
# ifndef PATH_MAX
# define PATH_MAX 8192
# endif
char *buf = xmalloc(PATH_MAX+1);
if (!getwd(buf)) {
free(buf);
rb_sys_fail("getwd");
}
#endif
return buf;
}
/****************************************************************
*
* The author of this software is David M. Gay.
*
* Copyright (c) 1991, 2000, 2001 by Lucent Technologies.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose without fee is hereby granted, provided that this entire notice
* is included in all copies of any software which is or includes a copy
* or modification of this software and in all copies of the supporting
* documentation for such software.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTY. IN PARTICULAR, NEITHER THE AUTHOR NOR LUCENT MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
*
***************************************************************/
/* Please send bug reports to David M. Gay (dmg at acm dot org,
* with " at " changed at "@" and " dot " changed to "."). */
/* On a machine with IEEE extended-precision registers, it is
* necessary to specify double-precision (53-bit) rounding precision
* before invoking strtod or dtoa. If the machine uses (the equivalent
* of) Intel 80x87 arithmetic, the call
* _control87(PC_53, MCW_PC);
* does this with many compilers. Whether this or another call is
* appropriate depends on the compiler; for this to work, it may be
* necessary to #include "float.h" or another system-dependent header
* file.
*/
/* strtod for IEEE-, VAX-, and IBM-arithmetic machines.
*
* This strtod returns a nearest machine number to the input decimal
* string (or sets errno to ERANGE). With IEEE arithmetic, ties are
* broken by the IEEE round-even rule. Otherwise ties are broken by
* biased rounding (add half and chop).
*
* Inspired loosely by William D. Clinger's paper "How to Read Floating
* Point Numbers Accurately" [Proc. ACM SIGPLAN '90, pp. 92-101].
*
* Modifications:
*
* 1. We only require IEEE, IBM, or VAX double-precision
* arithmetic (not IEEE double-extended).
* 2. We get by with floating-point arithmetic in a case that
* Clinger missed -- when we're computing d * 10^n
* for a small integer d and the integer n is not too
* much larger than 22 (the maximum integer k for which
* we can represent 10^k exactly), we may be able to
* compute (d*10^k) * 10^(e-k) with just one roundoff.
* 3. Rather than a bit-at-a-time adjustment of the binary
* result in the hard case, we use floating-point
* arithmetic to determine the adjustment to within
* one bit; only in really hard cases do we need to
* compute a second residual.
* 4. Because of 3., we don't need a large table of powers of 10
* for ten-to-e (just some small tables, e.g. of 10^k
* for 0 <= k <= 22).
*/
/*
* #define IEEE_LITTLE_ENDIAN for IEEE-arithmetic machines where the least
* significant byte has the lowest address.
* #define IEEE_BIG_ENDIAN for IEEE-arithmetic machines where the most
* significant byte has the lowest address.
* #define Long int on machines with 32-bit ints and 64-bit longs.
* #define IBM for IBM mainframe-style floating-point arithmetic.
* #define VAX for VAX-style floating-point arithmetic (D_floating).
* #define No_leftright to omit left-right logic in fast floating-point
* computation of dtoa.
* #define Honor_FLT_ROUNDS if FLT_ROUNDS can assume the values 2 or 3
* and strtod and dtoa should round accordingly.
* #define Check_FLT_ROUNDS if FLT_ROUNDS can assume the values 2 or 3
* and Honor_FLT_ROUNDS is not #defined.
* #define RND_PRODQUOT to use rnd_prod and rnd_quot (assembly routines
* that use extended-precision instructions to compute rounded
* products and quotients) with IBM.
* #define ROUND_BIASED for IEEE-format with biased rounding.
* #define Inaccurate_Divide for IEEE-format with correctly rounded
* products but inaccurate quotients, e.g., for Intel i860.
* #define NO_LONG_LONG on machines that do not have a "long long"
* integer type (of >= 64 bits). On such machines, you can
* #define Just_16 to store 16 bits per 32-bit Long when doing
* high-precision integer arithmetic. Whether this speeds things
* up or slows things down depends on the machine and the number
* being converted. If long long is available and the name is
* something other than "long long", #define Llong to be the name,
* and if "unsigned Llong" does not work as an unsigned version of
* Llong, #define #ULLong to be the corresponding unsigned type.
* #define KR_headers for old-style C function headers.
* #define Bad_float_h if your system lacks a float.h or if it does not
* define some or all of DBL_DIG, DBL_MAX_10_EXP, DBL_MAX_EXP,
* FLT_RADIX, FLT_ROUNDS, and DBL_MAX.
* #define MALLOC your_malloc, where your_malloc(n) acts like malloc(n)
* if memory is available and otherwise does something you deem
* appropriate. If MALLOC is undefined, malloc will be invoked
* directly -- and assumed always to succeed.
* #define Omit_Private_Memory to omit logic (added Jan. 1998) for making
* memory allocations from a private pool of memory when possible.
* When used, the private pool is PRIVATE_MEM bytes long: 2304 bytes,
* unless #defined to be a different length. This default length
* suffices to get rid of MALLOC calls except for unusual cases,
* such as decimal-to-binary conversion of a very long string of
* digits. The longest string dtoa can return is about 751 bytes
* long. For conversions by strtod of strings of 800 digits and
* all dtoa conversions in single-threaded executions with 8-byte
* pointers, PRIVATE_MEM >= 7400 appears to suffice; with 4-byte
* pointers, PRIVATE_MEM >= 7112 appears adequate.
* #define INFNAN_CHECK on IEEE systems to cause strtod to check for
* Infinity and NaN (case insensitively). On some systems (e.g.,
* some HP systems), it may be necessary to #define NAN_WORD0
* appropriately -- to the most significant word of a quiet NaN.
* (On HP Series 700/800 machines, -DNAN_WORD0=0x7ff40000 works.)
* When INFNAN_CHECK is #defined and No_Hex_NaN is not #defined,
* strtod also accepts (case insensitively) strings of the form
* NaN(x), where x is a string of hexadecimal digits and spaces;
* if there is only one string of hexadecimal digits, it is taken
* for the 52 fraction bits of the resulting NaN; if there are two
* or more strings of hex digits, the first is for the high 20 bits,
* the second and subsequent for the low 32 bits, with intervening
* white space ignored; but if this results in none of the 52
* fraction bits being on (an IEEE Infinity symbol), then NAN_WORD0
* and NAN_WORD1 are used instead.
* #define MULTIPLE_THREADS if the system offers preemptively scheduled
* multiple threads. In this case, you must provide (or suitably
* #define) two locks, acquired by ACQUIRE_DTOA_LOCK(n) and freed
* by FREE_DTOA_LOCK(n) for n = 0 or 1. (The second lock, accessed
* in pow5mult, ensures lazy evaluation of only one copy of high
* powers of 5; omitting this lock would introduce a small
* probability of wasting memory, but would otherwise be harmless.)
* You must also invoke freedtoa(s) to free the value s returned by
* dtoa. You may do so whether or not MULTIPLE_THREADS is #defined.
* #define NO_IEEE_Scale to disable new (Feb. 1997) logic in strtod that
* avoids underflows on inputs whose result does not underflow.
* If you #define NO_IEEE_Scale on a machine that uses IEEE-format
* floating-point numbers and flushes underflows to zero rather
* than implementing gradual underflow, then you must also #define
* Sudden_Underflow.
* #define YES_ALIAS to permit aliasing certain double values with
* arrays of ULongs. This leads to slightly better code with
* some compilers and was always used prior to 19990916, but it
* is not strictly legal and can cause trouble with aggressively
* optimizing compilers (e.g., gcc 2.95.1 under -O2).
* #define USE_LOCALE to use the current locale's decimal_point value.
* #define SET_INEXACT if IEEE arithmetic is being used and extra
* computation should be done to set the inexact flag when the
* result is inexact and avoid setting inexact when the result
* is exact. In this case, dtoa.c must be compiled in
* an environment, perhaps provided by #include "dtoa.c" in a
* suitable wrapper, that defines two functions,
* int get_inexact(void);
* void clear_inexact(void);
* such that get_inexact() returns a nonzero value if the
* inexact bit is already set, and clear_inexact() sets the
* inexact bit to 0. When SET_INEXACT is #defined, strtod
* also does extra computations to set the underflow and overflow
* flags when appropriate (i.e., when the result is tiny and
* inexact or when it is a numeric value rounded to +-infinity).
* #define NO_ERRNO if strtod should not assign errno = ERANGE when
* the result overflows to +-Infinity or underflows to 0.
*/
#ifdef WORDS_BIGENDIAN
#define IEEE_BIG_ENDIAN
#else
#define IEEE_LITTLE_ENDIAN
#endif
#ifdef __vax__
#define VAX
#undef IEEE_BIG_ENDIAN
#undef IEEE_LITTLE_ENDIAN
#endif
#if defined(__arm__) && !defined(__VFP_FP__)
#define IEEE_BIG_ENDIAN
#undef IEEE_LITTLE_ENDIAN
#endif
#undef Long
#undef ULong
#if SIZEOF_INT == 4
#define Long int
#define ULong unsigned int
#elif SIZEOF_LONG == 4
#define Long long int
#define ULong unsigned long int
#endif
#if HAVE_LONG_LONG
#define Llong LONG_LONG
#endif
#ifdef DEBUG
#include "stdio.h"
#define Bug(x) {fprintf(stderr, "%s\n", x); exit(1);}
#endif
#include "stdlib.h"
#include "string.h"
#ifdef USE_LOCALE
#include "locale.h"
#endif
#ifdef MALLOC
extern void *MALLOC(size_t);
#else
#define MALLOC malloc
#endif
#ifndef Omit_Private_Memory
#ifndef PRIVATE_MEM
#define PRIVATE_MEM 2304
#endif
#define PRIVATE_mem ((PRIVATE_MEM+sizeof(double)-1)/sizeof(double))
static double private_mem[PRIVATE_mem], *pmem_next = private_mem;
#endif
#undef IEEE_Arith
#undef Avoid_Underflow
#ifdef IEEE_BIG_ENDIAN
#define IEEE_Arith
#endif
#ifdef IEEE_LITTLE_ENDIAN
#define IEEE_Arith
#endif
#include "errno.h"
#ifdef Bad_float_h
#ifdef IEEE_Arith
#define DBL_DIG 15
#define DBL_MAX_10_EXP 308
#define DBL_MAX_EXP 1024
#define FLT_RADIX 2
#endif /*IEEE_Arith*/
#ifdef IBM
#define DBL_DIG 16
#define DBL_MAX_10_EXP 75
#define DBL_MAX_EXP 63
#define FLT_RADIX 16
#define DBL_MAX 7.2370055773322621e+75
#endif
#ifdef VAX
#define DBL_DIG 16
#define DBL_MAX_10_EXP 38
#define DBL_MAX_EXP 127
#define FLT_RADIX 2
#define DBL_MAX 1.7014118346046923e+38
#endif
#ifndef LONG_MAX
#define LONG_MAX 2147483647
#endif
#else /* ifndef Bad_float_h */
#include "float.h"
#endif /* Bad_float_h */
#ifndef __MATH_H__
#include "math.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
#if defined(IEEE_LITTLE_ENDIAN) + defined(IEEE_BIG_ENDIAN) + defined(VAX) + defined(IBM) != 1
Exactly one of IEEE_LITTLE_ENDIAN, IEEE_BIG_ENDIAN, VAX, or IBM should be defined.
#endif
typedef union { double d; ULong L[2]; } U;
#ifdef YES_ALIAS
typedef double double_u;
# define dval(x) x
# ifdef IEEE_LITTLE_ENDIAN
# define word0(x) (((ULong *)&x)[1])
# define word1(x) (((ULong *)&x)[0])
# else
# define word0(x) (((ULong *)&x)[0])
# define word1(x) (((ULong *)&x)[1])
# endif
#else
typedef U double_u;
# ifdef IEEE_LITTLE_ENDIAN
# define word0(x) (x.L[1])
# define word1(x) (x.L[0])
# else
# define word0(x) (x.L[0])
# define word1(x) (x.L[1])
# endif
# define dval(x) (x.d)
#endif
/* The following definition of Storeinc is appropriate for MIPS processors.
* An alternative that might be better on some machines is
* #define Storeinc(a,b,c) (*a++ = b << 16 | c & 0xffff)
*/
#if defined(IEEE_LITTLE_ENDIAN) + defined(VAX) + defined(__arm__)
#define Storeinc(a,b,c) (((unsigned short *)a)[1] = (unsigned short)b, \
((unsigned short *)a)[0] = (unsigned short)c, a++)
#else
#define Storeinc(a,b,c) (((unsigned short *)a)[0] = (unsigned short)b, \
((unsigned short *)a)[1] = (unsigned short)c, a++)
#endif
/* #define P DBL_MANT_DIG */
/* Ten_pmax = floor(P*log(2)/log(5)) */
/* Bletch = (highest power of 2 < DBL_MAX_10_EXP) / 16 */
/* Quick_max = floor((P-1)*log(FLT_RADIX)/log(10) - 1) */
/* Int_max = floor(P*log(FLT_RADIX)/log(10) - 1) */
#ifdef IEEE_Arith
#define Exp_shift 20
#define Exp_shift1 20