aboutsummaryrefslogtreecommitdiffstats
path: root/util.c
blob: 8ec0cd60e52e9cf1f8bbd30e23a78b29fb60a485 (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
/**********************************************************************

  util.c -

  $Author$
  created at: Fri Mar 10 17:22:34 JST 1995

  Copyright (C) 1993-2008 Yukihiro Matsumoto

**********************************************************************/

#if defined __MINGW32__ || defined __MINGW64__
# define MINGW_HAS_SECURE_API 1
#endif

#include "ruby/internal/config.h"

#include <ctype.h>
#include <errno.h>
#include <float.h>
#include <math.h>
#include <stdio.h>

#ifdef _WIN32
# include "missing/file.h"
#endif

#include "internal.h"
#include "internal/sanitizers.h"
#include "internal/util.h"
#include "ruby/util.h"
#include "ruby_atomic.h"

const char ruby_hexdigits[] = "0123456789abcdef0123456789ABCDEF";
#define hexdigit ruby_hexdigits

unsigned long
ruby_scan_oct(const char *start, size_t len, size_t *retlen)
{
    register const char *s = start;
    register unsigned long retval = 0;
    size_t i;

    for (i = 0; i < len; i++) {
        if ((s[0] < '0') || ('7' < s[0])) {
            break;
        }
	retval <<= 3;
	retval |= *s++ - '0';
    }
    *retlen = (int)(s - start);	/* less than len */
    return retval;
}

unsigned long
ruby_scan_hex(const char *start, size_t len, size_t *retlen)
{
    register const char *s = start;
    register unsigned long retval = 0;
    const char *tmp;
    size_t i = 0;

    for (i = 0; i < len; i++) {
        if (! s[0]) {
            break;
        }
        tmp = strchr(hexdigit, *s);
        if (! tmp) {
            break;
        }
	retval <<= 4;
	retval |= (tmp - hexdigit) & 15;
	s++;
    }
    *retlen = (int)(s - start);	/* less than len */
    return retval;
}

const signed char ruby_digit36_to_number_table[] = {
    /*     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f */
    /*0*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*1*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*2*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*3*/  0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1,
    /*4*/ -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
    /*5*/ 25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
    /*6*/ -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
    /*7*/ 25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
    /*8*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*9*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*a*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*b*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*c*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*d*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*e*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
    /*f*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
};

NO_SANITIZE("unsigned-integer-overflow", extern unsigned long ruby_scan_digits(const char *str, ssize_t len, int base, size_t *retlen, int *overflow));
unsigned long
ruby_scan_digits(const char *str, ssize_t len, int base, size_t *retlen, int *overflow)
{

    const char *start = str;
    unsigned long ret = 0, x;
    unsigned long mul_overflow = (~(unsigned long)0) / base;

    *overflow = 0;

    if (!len) {
	*retlen = 0;
	return 0;
    }

    do {
	int d = ruby_digit36_to_number_table[(unsigned char)*str++];
        if (d == -1 || base <= d) {
	    --str;
	    break;
        }
        if (mul_overflow < ret)
            *overflow = 1;
        ret *= base;
        x = ret;
        ret += d;
        if (ret < x)
            *overflow = 1;
    } while (len < 0 || --len);
    *retlen = str - start;
    return ret;
}

unsigned long
ruby_strtoul(const char *str, char **endptr, int base)
{
    int c, b, overflow;
    int sign = 0;
    size_t len;
    unsigned long ret;
    const char *subject_found = str;

    if (base == 1 || 36 < base) {
        errno = EINVAL;
        return 0;
    }

    while ((c = *str) && ISSPACE(c))
        str++;

    if (c == '+') {
        sign = 1;
        str++;
    }
    else if (c == '-') {
        sign = -1;
        str++;
    }

    if (str[0] == '0') {
        subject_found = str+1;
        if (base == 0 || base == 16) {
            if (str[1] == 'x' || str[1] == 'X') {
                b = 16;
                str += 2;
            }
            else {
                b = base == 0 ? 8 : 16;
                str++;
            }
        }
        else {
            b = base;
            str++;
        }
    }
    else {
        b = base == 0 ? 10 : base;
    }

    ret = ruby_scan_digits(str, -1, b, &len, &overflow);

    if (0 < len)
        subject_found = str+len;

    if (endptr)
        *endptr = (char*)subject_found;

    if (overflow) {
        errno = ERANGE;
        return ULONG_MAX;
    }

    if (sign < 0) {
        ret = (unsigned long)(-(long)ret);
        return ret;
    }
    else {
        return ret;
    }
}

#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

typedef int (cmpfunc_t)(const void*, const void*, void*);

#if defined HAVE_QSORT_S && defined RUBY_MSVCRT_VERSION
/* In contrast to its name, Visual Studio qsort_s is incompatible with
 * C11 in the order of the comparison function's arguments, and same
 * as BSD qsort_r rather. */
# define qsort_r(base, nel, size, arg, cmp) qsort_s(base, nel, size, cmp, arg)
# define cmp_bsd_qsort cmp_ms_qsort
# define HAVE_BSD_QSORT_R 1
#endif

#if defined HAVE_BSD_QSORT_R
struct bsd_qsort_r_args {
    cmpfunc_t *cmp;
    void *arg;
};

static int
cmp_bsd_qsort(void *d, const void *a, const void *b)
{
    const struct bsd_qsort_r_args *args = d;
    return (*args->cmp)(a, b, args->arg);
}

void
ruby_qsort(void* base, const size_t nel, const size_t size, cmpfunc_t *cmp, void *d)
{
    struct bsd_qsort_r_args args;
    args.cmp = cmp;
    args.arg = d;
    qsort_r(base, nel, size, &args, cmp_bsd_qsort);
}
#elif defined HAVE_QSORT_S
/* C11 qsort_s has the same arguments as GNU's, but uses
 * runtime-constraints handler. */
void
ruby_qsort(void* base, const size_t nel, const size_t size, cmpfunc_t *cmp, void *d)
{
    if (!nel || !size) return;  /* nothing to sort */

    /* get rid of runtime-constraints handler for MT-safeness */
    if (!base || !cmp) return;
    if (nel > RSIZE_MAX || size > RSIZE_MAX) return;

    qsort_s(base, nel, size, cmp, d);
}
# define HAVE_GNU_QSORT_R 1
#elif !defined HAVE_GNU_QSORT_R
/* mm.c */

#define mmtype long
#define mmcount (16 / SIZEOF_LONG)
#define A ((mmtype*)a)
#define B ((mmtype*)b)
#define C ((mmtype*)c)
#define D ((mmtype*)d)

#define mmstep (sizeof(mmtype) * mmcount)
#define mmprepare(base, size) do {\
 if (((VALUE)(base) % sizeof(mmtype)) == 0 && ((size) % sizeof(mmtype)) == 0) \
   if ((size) >= mmstep) mmkind = 1;\
   else              mmkind = 0;\
 else                mmkind = -1;\
 high = ((size) / mmstep) * mmstep;\
 low  = ((size) % mmstep);\
} while (0)\

#define mmarg mmkind, size, high, low
#define mmargdecl int mmkind, size_t size, size_t high, size_t low

static void mmswap_(register char *a, register char *b, mmargdecl)
{
 if (a == b) return;
 if (mmkind >= 0) {
   register mmtype s;
#if mmcount > 1
   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;
#if mmcount > 2
       s = A[2]; A[2] = B[2]; B[2] = s;
#if mmcount > 3
       s = A[3]; A[3] = B[3]; B[3] = s;
#endif
#endif
       a += mmstep; b += mmstep;
     } while (a < t);
   }
#endif
   if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = s;
#if mmcount > 2
     if (low >= 2 * sizeof(mmtype)) { s = A[1]; A[1] = B[1]; B[1] = s;
#if mmcount > 3
       if (low >= 3 * sizeof(mmtype)) {s = A[2]; A[2] = B[2]; B[2] = s;}
#endif
     }
#endif
   }
 }
 else {
   register char *t = a + size, s;
   do {s = *a; *a++ = *b; *b++ = s;} while (a < t);
 }
}
#define mmswap(a,b) mmswap_((a),(b),mmarg)

/* a, b, c = b, c, a */
static void mmrot3_(register char *a, register char *b, register char *c, mmargdecl)
{
 if (mmkind >= 0) {
   register mmtype s;
#if mmcount > 1
   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;
#if mmcount > 2
       s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;
#if mmcount > 3
       s = A[3]; A[3] = B[3]; B[3] = C[3]; C[3] = s;
#endif
#endif
       a += mmstep; b += mmstep; c += mmstep;
     } while (a < t);
   }
#endif
   if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = C[0]; C[0] = s;
#if mmcount > 2
     if (low >= 2 * sizeof(mmtype)) { s = A[1]; A[1] = B[1]; B[1] = C[1]; C[1] = s;
#if mmcount > 3
       if (low == 3 * sizeof(mmtype)) {s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;}
#endif
     }
#endif
   }
 }
 else {
   register char *t = a + size, s;
   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      */
/* kawamura@tokuyama.ac.jp                           */
/*****************************************************/

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(void* base, const size_t nel, const size_t size, cmpfunc_t *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 current region */
  char *R = (char*)base + size*(nel-1); /* right end of current region */
  size_t chklim = 63;                   /* threshold of ordering element check */
  enum {size_bits = sizeof(size) * CHAR_BIT};
  stack_node stack[size_bits];          /* enough for size_t size */
  stack_node *top = stack;
  int mmkind;
  size_t high, low, n;

  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;
    n = (r - l + size) / size;  /* number of elements */
    m = l + size * (n >> 1);    /* calculate median value */

    if (n >= 60) {
      register char *m1;
      register char *m3;
      if (n >= 200) {
	n = size*(n>>3); /* number of bytes in splitting 8 */
	{
	  register char *p1 = l  + n;
	  register char *p2 = p1 + n;
	  register char *p3 = p2 + n;
	  m1 = med3(p1, p2, p3);
	  p1 = m  + n;
	  p2 = p1 + n;
	  p3 = p2 + n;
	  m3 = med3(p1, p2, p3);
	}
      }
      else {
	n = size*(n>>2); /* number of bytes in splitting 4 */
	m1 = l + n;
	m3 = m + n;
      }
      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 */
  }
}
#endif /* HAVE_GNU_QSORT_R */

char *
ruby_strdup(const char *str)
{
    char *tmp;
    size_t len = strlen(str) + 1;

    tmp = xmalloc(len);
    memcpy(tmp, str, len);

    return tmp;
}

char *
ruby_getcwd(void)
{
#if defined HAVE_GETCWD
# undef RUBY_UNTYPED_DATA_WARNING
# define RUBY_UNTYPED_DATA_WARNING 0
# if defined NO_GETCWD_MALLOC
    VALUE guard = Data_Wrap_Struct((VALUE)0, NULL, RUBY_DEFAULT_FREE, NULL);
    int size = 200;
    char *buf = xmalloc(size);

    while (!getcwd(buf, size)) {
	int e = errno;
	if (e != ERANGE) {
	    xfree(buf);
	    DATA_PTR(guard) = NULL;
	    rb_syserr_fail(e, "getcwd");
	}
	size *= 2;
	DATA_PTR(guard) = buf;
	buf = xrealloc(buf, size);
    }
# else
    VALUE guard = Data_Wrap_Struct((VALUE)0, NULL, free, NULL);
    char *buf, *cwd = getcwd(NULL, 0);
    DATA_PTR(guard) = cwd;
    if (!cwd) rb_sys_fail("getcwd");
    buf = ruby_strdup(cwd);	/* allocate by xmalloc */
    free(cwd);
# endif
    DATA_PTR(RB_GC_GUARD(guard)) = NULL;
#else
# ifndef PATH_MAX
#  define PATH_MAX 8192
# endif
    char *buf = xmalloc(PATH_MAX+1);

    if (!getwd(buf)) {
	int e = errno;
	xfree(buf);
	rb_syserr_fail(e, "getwd");
    }
#endif
    return buf;
}

void
ruby_each_words(const char *str, void (*func)(const char*, int, void*), void *arg)
{
    const char *end;
    int len;

    if (!str) return;
    for (; *str; str = end) {
	while (ISSPACE(*str) || *str == ',') str++;
	if (!*str) break;
	end = str;
	while (*end && !ISSPACE(*end) && *end != ',') end++;
	len = (int)(end - str);	/* assume no string exceeds INT_MAX */
	(*func)(str, len, arg);
    }
}

#undef strtod
#define strtod ruby_strtod
#undef dtoa
#define dtoa ruby_dtoa
#undef hdtoa
#define hdtoa ruby_hdtoa
#include "missing/dtoa.c"