PostgreSQL Source Code  git master
_int_tool.c
Go to the documentation of this file.
1 /*
2  * contrib/intarray/_int_tool.c
3  */
4 #include "postgres.h"
5 
6 #include <limits.h>
7 
8 #include "catalog/pg_type.h"
9 
10 #include "_int.h"
11 
12 
13 /* arguments are assumed sorted & unique-ified */
14 bool
16 {
17  int na,
18  nb;
19  int i,
20  j,
21  n;
22  int *da,
23  *db;
24 
25  na = ARRNELEMS(a);
26  nb = ARRNELEMS(b);
27  da = ARRPTR(a);
28  db = ARRPTR(b);
29 
30  i = j = n = 0;
31  while (i < na && j < nb)
32  {
33  if (da[i] < db[j])
34  i++;
35  else if (da[i] == db[j])
36  {
37  n++;
38  i++;
39  j++;
40  }
41  else
42  break; /* db[j] is not in da */
43  }
44 
45  return (n == nb) ? true : false;
46 }
47 
48 /* arguments are assumed sorted */
49 bool
51 {
52  int na,
53  nb;
54  int i,
55  j;
56  int *da,
57  *db;
58 
59  na = ARRNELEMS(a);
60  nb = ARRNELEMS(b);
61  da = ARRPTR(a);
62  db = ARRPTR(b);
63 
64  i = j = 0;
65  while (i < na && j < nb)
66  {
67  if (da[i] < db[j])
68  i++;
69  else if (da[i] == db[j])
70  return true;
71  else
72  j++;
73  }
74 
75  return false;
76 }
77 
78 ArrayType *
80 {
81  ArrayType *r = NULL;
82 
83  CHECKARRVALID(a);
84  CHECKARRVALID(b);
85 
86  if (ARRISEMPTY(a) && ARRISEMPTY(b))
87  return new_intArrayType(0);
88  if (ARRISEMPTY(a))
89  r = copy_intArrayType(b);
90  if (ARRISEMPTY(b))
91  r = copy_intArrayType(a);
92 
93  if (!r)
94  {
95  int na = ARRNELEMS(a),
96  nb = ARRNELEMS(b);
97  int *da = ARRPTR(a),
98  *db = ARRPTR(b);
99  int i,
100  j,
101  *dr;
102 
103  r = new_intArrayType(na + nb);
104  dr = ARRPTR(r);
105 
106  /* union */
107  i = j = 0;
108  while (i < na && j < nb)
109  {
110  if (da[i] == db[j])
111  {
112  *dr++ = da[i++];
113  j++;
114  }
115  else if (da[i] < db[j])
116  *dr++ = da[i++];
117  else
118  *dr++ = db[j++];
119  }
120 
121  while (i < na)
122  *dr++ = da[i++];
123  while (j < nb)
124  *dr++ = db[j++];
125 
126  r = resize_intArrayType(r, dr - ARRPTR(r));
127  }
128 
129  if (ARRNELEMS(r) > 1)
130  r = _int_unique(r);
131 
132  return r;
133 }
134 
135 ArrayType *
137 {
138  ArrayType *r;
139  int na,
140  nb;
141  int *da,
142  *db,
143  *dr;
144  int i,
145  j,
146  k;
147 
148  if (ARRISEMPTY(a) || ARRISEMPTY(b))
149  return new_intArrayType(0);
150 
151  na = ARRNELEMS(a);
152  nb = ARRNELEMS(b);
153  da = ARRPTR(a);
154  db = ARRPTR(b);
155  r = new_intArrayType(Min(na, nb));
156  dr = ARRPTR(r);
157 
158  i = j = k = 0;
159  while (i < na && j < nb)
160  {
161  if (da[i] < db[j])
162  i++;
163  else if (da[i] == db[j])
164  {
165  if (k == 0 || dr[k - 1] != db[j])
166  dr[k++] = db[j];
167  i++;
168  j++;
169  }
170  else
171  j++;
172  }
173 
174  if (k == 0)
175  {
176  pfree(r);
177  return new_intArrayType(0);
178  }
179  else
180  return resize_intArrayType(r, k);
181 }
182 
183 void
184 rt__int_size(ArrayType *a, float *size)
185 {
186  *size = (float) ARRNELEMS(a);
187 }
188 
189 /* qsort_arg comparison function for isort() */
190 static int
191 isort_cmp(const void *a, const void *b, void *arg)
192 {
193  int32 aval = *((const int32 *) a);
194  int32 bval = *((const int32 *) b);
195 
196  if (aval < bval)
197  return -1;
198  if (aval > bval)
199  return 1;
200 
201  /*
202  * Report if we have any duplicates. If there are equal keys, qsort must
203  * compare them at some point, else it wouldn't know whether one should go
204  * before or after the other.
205  */
206  *((bool *) arg) = true;
207  return 0;
208 }
209 
210 /* Sort the given data (len >= 2). Return true if any duplicates found */
211 bool
212 isort(int32 *a, int len)
213 {
214  bool r = false;
215 
216  qsort_arg(a, len, sizeof(int32), isort_cmp, (void *) &r);
217  return r;
218 }
219 
220 /* Create a new int array with room for "num" elements */
221 ArrayType *
223 {
224  ArrayType *r;
225  int nbytes;
226 
227  /* if no elements, return a zero-dimensional array */
228  if (num <= 0)
229  {
230  Assert(num == 0);
231  r = construct_empty_array(INT4OID);
232  return r;
233  }
234 
235  nbytes = ARR_OVERHEAD_NONULLS(1) + sizeof(int) * num;
236 
237  r = (ArrayType *) palloc0(nbytes);
238 
239  SET_VARSIZE(r, nbytes);
240  ARR_NDIM(r) = 1;
241  r->dataoffset = 0; /* marker for no null bitmap */
242  ARR_ELEMTYPE(r) = INT4OID;
243  ARR_DIMS(r)[0] = num;
244  ARR_LBOUND(r)[0] = 1;
245 
246  return r;
247 }
248 
249 ArrayType *
251 {
252  int nbytes;
253  int i;
254 
255  /* if no elements, return a zero-dimensional array */
256  if (num <= 0)
257  {
258  Assert(num == 0);
259  a = construct_empty_array(INT4OID);
260  return a;
261  }
262 
263  if (num == ARRNELEMS(a))
264  return a;
265 
266  nbytes = ARR_DATA_OFFSET(a) + sizeof(int) * num;
267 
268  a = (ArrayType *) repalloc(a, nbytes);
269 
270  SET_VARSIZE(a, nbytes);
271  /* usually the array should be 1-D already, but just in case ... */
272  for (i = 0; i < ARR_NDIM(a); i++)
273  {
274  ARR_DIMS(a)[i] = num;
275  num = 1;
276  }
277  return a;
278 }
279 
280 ArrayType *
282 {
283  ArrayType *r;
284  int n = ARRNELEMS(a);
285 
286  r = new_intArrayType(n);
287  memcpy(ARRPTR(r), ARRPTR(a), n * sizeof(int32));
288  return r;
289 }
290 
291 /* num for compressed key */
292 int
293 internal_size(int *a, int len)
294 {
295  int i;
296  int64 size = 0;
297 
298  for (i = 0; i < len; i += 2)
299  {
300  if (!i || a[i] != a[i - 1]) /* do not count repeated range */
301  size += (int64) (a[i + 1]) - (int64) (a[i]) + 1;
302  }
303 
304  if (size > (int64) INT_MAX || size < (int64) INT_MIN)
305  return -1; /* overflow */
306  return (int) size;
307 }
308 
309 /* unique-ify elements of r in-place ... r must be sorted already */
310 ArrayType *
312 {
313  int *tmp,
314  *dr,
315  *data;
316  int num = ARRNELEMS(r);
317 
318  if (num < 2)
319  return r;
320 
321  data = tmp = dr = ARRPTR(r);
322  while (tmp - data < num)
323  {
324  if (*tmp != *dr)
325  *(++dr) = *tmp++;
326  else
327  tmp++;
328  }
329  return resize_intArrayType(r, dr + 1 - ARRPTR(r));
330 }
331 
332 void
333 gensign(BITVEC sign, int *a, int len)
334 {
335  int i;
336 
337  /* we assume that the sign vector is previously zeroed */
338  for (i = 0; i < len; i++)
339  {
340  HASH(sign, *a);
341  a++;
342  }
343 }
344 
345 int32
347 {
348  int32 *aa,
349  c,
350  i;
351 
352  CHECKARRVALID(a);
353  c = ARRNELEMS(a);
354  aa = ARRPTR(a);
355  for (i = 0; i < c; i++)
356  if (aa[i] == elem)
357  return (i + 1);
358  return 0;
359 }
360 
361 ArrayType *
363 {
364  ArrayType *result;
365  int32 *r;
366  int32 c;
367 
368  CHECKARRVALID(a);
369  c = ARRNELEMS(a);
370  result = new_intArrayType(c + 1);
371  r = ARRPTR(result);
372  if (c > 0)
373  memcpy(r, ARRPTR(a), c * sizeof(int32));
374  r[c] = elem;
375  return result;
376 }
377 
378 ArrayType *
380 {
381  ArrayType *result;
382  int32 ac = ARRNELEMS(a);
383  int32 bc = ARRNELEMS(b);
384 
385  CHECKARRVALID(a);
386  CHECKARRVALID(b);
387  result = new_intArrayType(ac + bc);
388  if (ac)
389  memcpy(ARRPTR(result), ARRPTR(a), ac * sizeof(int32));
390  if (bc)
391  memcpy(ARRPTR(result) + ac, ARRPTR(b), bc * sizeof(int32));
392  return result;
393 }
394 
395 ArrayType *
397 {
398  ArrayType *result;
399  int32 *aa;
400 
401  result = new_intArrayType(1);
402  aa = ARRPTR(result);
403  aa[0] = n;
404  return result;
405 }
406 
407 int
408 compASC(const void *a, const void *b)
409 {
410  if (*(const int32 *) a == *(const int32 *) b)
411  return 0;
412  return (*(const int32 *) a > *(const int32 *) b) ? 1 : -1;
413 }
414 
415 int
416 compDESC(const void *a, const void *b)
417 {
418  if (*(const int32 *) a == *(const int32 *) b)
419  return 0;
420  return (*(const int32 *) a < *(const int32 *) b) ? 1 : -1;
421 }
ArrayType * new_intArrayType(int num)
Definition: _int_tool.c:222
#define ARR_OVERHEAD_NONULLS(ndims)
Definition: array.h:298
int compDESC(const void *a, const void *b)
Definition: _int_tool.c:416
int internal_size(int *a, int len)
Definition: _int_tool.c:293
ArrayType * intarray_concat_arrays(ArrayType *a, ArrayType *b)
Definition: _int_tool.c:379
#define CHECKARRVALID(x)
Definition: _int.h:18
int32 dataoffset
Definition: array.h:84
#define Min(x, y)
Definition: c.h:904
#define HASH(sign, val)
Definition: hstore_gist.c:35
ArrayType * resize_intArrayType(ArrayType *a, int num)
Definition: _int_tool.c:250
ArrayType * construct_empty_array(Oid elmtype)
Definition: arrayfuncs.c:3410
void rt__int_size(ArrayType *a, float *size)
Definition: _int_tool.c:184
signed int int32
Definition: c.h:346
#define ARR_DATA_OFFSET(a)
Definition: array.h:304
#define ARR_LBOUND(a)
Definition: array.h:284
#define true
Definition: c.h:312
void pfree(void *pointer)
Definition: mcxt.c:1056
ArrayType * inner_int_inter(ArrayType *a, ArrayType *b)
Definition: _int_tool.c:136
#define ARR_DIMS(a)
Definition: array.h:282
char BITVEC[SIGLEN]
Definition: hstore_gist.c:19
char sign
Definition: informix.c:688
char * c
#define ARRISEMPTY(x)
Definition: _int.h:26
int compASC(const void *a, const void *b)
Definition: _int_tool.c:408
void qsort_arg(void *base, size_t nel, size_t elsize, qsort_arg_comparator cmp, void *arg)
Definition: qsort_arg.c:113
ArrayType * inner_int_union(ArrayType *a, ArrayType *b)
Definition: _int_tool.c:79
void * palloc0(Size size)
Definition: mcxt.c:980
bool inner_int_contains(ArrayType *a, ArrayType *b)
Definition: _int_tool.c:15
static int isort_cmp(const void *a, const void *b, void *arg)
Definition: _int_tool.c:191
bool inner_int_overlap(ArrayType *a, ArrayType *b)
Definition: _int_tool.c:50
int32 intarray_match_first(ArrayType *a, int32 elem)
Definition: _int_tool.c:346
#define Assert(condition)
Definition: c.h:732
ArrayType * copy_intArrayType(ArrayType *a)
Definition: _int_tool.c:281
ArrayType * _int_unique(ArrayType *r)
Definition: _int_tool.c:311
#define ARR_NDIM(a)
Definition: array.h:278
#define ARRNELEMS(x)
Definition: cube.c:26
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1069
int i
void * arg
#define SET_VARSIZE(PTR, len)
Definition: postgres.h:329
#define ARRPTR(x)
Definition: cube.c:25
ArrayType * intarray_add_elem(ArrayType *a, int32 elem)
Definition: _int_tool.c:362
bool isort(int32 *a, int len)
Definition: _int_tool.c:212
#define ARR_ELEMTYPE(a)
Definition: array.h:280
ArrayType * int_to_intset(int32 n)
Definition: _int_tool.c:396
void gensign(BITVEC sign, int *a, int len)
Definition: _int_tool.c:333