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4d39c6bcf5de439c72d20b5ff65ad9991e2d86b1
postgres/contrib/tsearch2/snowball/utilities.c
Bruce Momjian 1dc3498251 Standard pgindent run for 8.1.
2005-10-15 02:49:52 +00:00

657 lines
11 KiB
C
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "header.h"
#define unless(C) if(!(C))
#define CREATE_SIZE 1
extern symbol *
create_s(void)
{
symbol *p;
void *mem = malloc(HEAD + (CREATE_SIZE + 1) * sizeof(symbol));
if (mem == NULL)
return NULL;
p = (symbol *) (HEAD + (char *) mem);
CAPACITY(p) = CREATE_SIZE;
SET_SIZE(p, CREATE_SIZE);
return p;
}
extern void
lose_s(symbol * p)
{
if (p == NULL)
return;
free((char *) p - HEAD);
}
/*
new_p = X_skip_utf8(p, c, lb, l, n); skips n characters forwards from p + c
if n +ve, or n characters backwards from p +c - 1 if n -ve. new_p is the new
position, or 0 on failure.
-- used to implement hop and next in the utf8 case.
*/
extern int
skip_utf8(const symbol * p, int c, int lb, int l, int n)
{
int b;
if (n >= 0)
{
for (; n > 0; n--)
{
if (c >= l)
return -1;
b = p[c++];
if (b >= 0xC0)
{ /* 1100 0000 */
while (c < l)
{
b = p[c];
if (b >= 0xC0 || b < 0x80)
break;
/* break unless b is 10------ */
c++;
}
}
}
}
else
{
for (; n < 0; n++)
{
if (c <= lb)
return -1;
b = p[--c];
if (b >= 0x80)
{ /* 1000 0000 */
while (c > lb)
{
b = p[c];
if (b >= 0xC0)
break; /* 1100 0000 */
c--;
}
}
}
}
return c;
}
/* Code for character groupings: utf8 cases */
static int
get_utf8(const symbol * p, int c, int l, int *slot)
{
int b0,
b1;
if (c >= l)
return 0;
b0 = p[c++];
if (b0 < 0xC0 || c == l)
{ /* 1100 0000 */
*slot = b0;
return 1;
}
b1 = p[c++];
if (b0 < 0xE0 || c == l)
{ /* 1110 0000 */
*slot = (b0 & 0x1F) << 6 | (b1 & 0x3F);
return 2;
}
*slot = (b0 & 0xF) << 12 | (b1 & 0x3F) << 6 | (*p & 0x3F);
return 3;
}
static int
get_b_utf8(const symbol * p, int c, int lb, int *slot)
{
int b0,
b1;
if (c <= lb)
return 0;
b0 = p[--c];
if (b0 < 0x80 || c == lb)
{ /* 1000 0000 */
*slot = b0;
return 1;
}
b1 = p[--c];
if (b1 >= 0xC0 || c == lb)
{ /* 1100 0000 */
*slot = (b1 & 0x1F) << 6 | (b0 & 0x3F);
return 2;
}
*slot = (*p & 0xF) << 12 | (b1 & 0x3F) << 6 | (b0 & 0x3F);
return 3;
}
extern int
in_grouping_U(struct SN_env * z, unsigned char *s, int min, int max)
{
int ch;
int w = get_utf8(z->p, z->c, z->l, &ch);
unless(w) return 0;
if (ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0)
return 0;
z->c += w;
return 1;
}
extern int
in_grouping_b_U(struct SN_env * z, unsigned char *s, int min, int max)
{
int ch;
int w = get_b_utf8(z->p, z->c, z->lb, &ch);
unless(w) return 0;
if (ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0)
return 0;
z->c -= w;
return 1;
}
extern int
out_grouping_U(struct SN_env * z, unsigned char *s, int min, int max)
{
int ch;
int w = get_utf8(z->p, z->c, z->l, &ch);
unless(w) return 0;
unless(ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0) return 0;
z->c += w;
return 1;
}
extern int
out_grouping_b_U(struct SN_env * z, unsigned char *s, int min, int max)
{
int ch;
int w = get_b_utf8(z->p, z->c, z->lb, &ch);
unless(w) return 0;
unless(ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0) return 0;
z->c -= w;
return 1;
}
/* Code for character groupings: non-utf8 cases */
extern int
in_grouping(struct SN_env * z, unsigned char *s, int min, int max)
{
int ch;
if (z->c >= z->l)
return 0;
ch = z->p[z->c];
if (ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0)
return 0;
z->c++;
return 1;
}
extern int
in_grouping_b(struct SN_env * z, unsigned char *s, int min, int max)
{
int ch;
if (z->c <= z->lb)
return 0;
ch = z->p[z->c - 1];
if (ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0)
return 0;
z->c--;
return 1;
}
extern int
out_grouping(struct SN_env * z, unsigned char *s, int min, int max)
{
int ch;
if (z->c >= z->l)
return 0;
ch = z->p[z->c];
unless(ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0) return 0;
z->c++;
return 1;
}
extern int
out_grouping_b(struct SN_env * z, unsigned char *s, int min, int max)
{
int ch;
if (z->c <= z->lb)
return 0;
ch = z->p[z->c - 1];
unless(ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0) return 0;
z->c--;
return 1;
}
extern int
eq_s(struct SN_env * z, int s_size, symbol * s)
{
if (z->l - z->c < s_size || memcmp(z->p + z->c, s, s_size * sizeof(symbol)) != 0)
return 0;
z->c += s_size;
return 1;
}
extern int
eq_s_b(struct SN_env * z, int s_size, symbol * s)
{
if (z->c - z->lb < s_size || memcmp(z->p + z->c - s_size, s, s_size * sizeof(symbol)) != 0)
return 0;
z->c -= s_size;
return 1;
}
extern int
eq_v(struct SN_env * z, symbol * p)
{
return eq_s(z, SIZE(p), p);
}
extern int
eq_v_b(struct SN_env * z, symbol * p)
{
return eq_s_b(z, SIZE(p), p);
}
extern int
find_among(struct SN_env * z, struct among * v, int v_size)
{
int i = 0;
int j = v_size;
int c = z->c;
int l = z->l;
symbol *q = z->p + c;
struct among *w;
int common_i = 0;
int common_j = 0;
int first_key_inspected = 0;
while (1)
{
int k = i + ((j - i) >> 1);
int diff = 0;
int common = common_i < common_j ? common_i : common_j; /* smaller */
w = v + k;
{
int i;
for (i = common; i < w->s_size; i++)
{
if (c + common == l)
{
diff = -1;
break;
}
diff = q[common] - w->s[i];
if (diff != 0)
break;
common++;
}
}
if (diff < 0)
{
j = k;
common_j = common;
}
else
{
i = k;
common_i = common;
}
if (j - i <= 1)
{
if (i > 0)
break; /* v->s has been inspected */
if (j == i)
break; /* only one item in v */
/*
* - but now we need to go round once more to get v->s inspected.
* This looks messy, but is actually the optimal approach.
*/
if (first_key_inspected)
break;
first_key_inspected = 1;
}
}
while (1)
{
w = v + i;
if (common_i >= w->s_size)
{
z->c = c + w->s_size;
if (w->function == 0)
return w->result;
{
int res = w->function(z);
z->c = c + w->s_size;
if (res)
return w->result;
}
}
i = w->substring_i;
if (i < 0)
return 0;
}
}
/* find_among_b is for backwards processing. Same comments apply */
extern int
find_among_b(struct SN_env * z, struct among * v, int v_size)
{
int i = 0;
int j = v_size;
int c = z->c;
int lb = z->lb;
symbol *q = z->p + c - 1;
struct among *w;
int common_i = 0;
int common_j = 0;
int first_key_inspected = 0;
while (1)
{
int k = i + ((j - i) >> 1);
int diff = 0;
int common = common_i < common_j ? common_i : common_j;
w = v + k;
{
int i;
for (i = w->s_size - 1 - common; i >= 0; i--)
{
if (c - common == lb)
{
diff = -1;
break;
}
diff = q[-common] - w->s[i];
if (diff != 0)
break;
common++;
}
}
if (diff < 0)
{
j = k;
common_j = common;
}
else
{
i = k;
common_i = common;
}
if (j - i <= 1)
{
if (i > 0)
break;
if (j == i)
break;
if (first_key_inspected)
break;
first_key_inspected = 1;
}
}
while (1)
{
w = v + i;
if (common_i >= w->s_size)
{
z->c = c - w->s_size;
if (w->function == 0)
return w->result;
{
int res = w->function(z);
z->c = c - w->s_size;
if (res)
return w->result;
}
}
i = w->substring_i;
if (i < 0)
return 0;
}
}
/* Increase the size of the buffer pointed to by p to at least n symbols.
* If insufficient memory, returns NULL and frees the old buffer.
*/
static symbol *
increase_size(symbol * p, int n)
{
symbol *q;
int new_size = n + 20;
void *mem = realloc((char *) p - HEAD,
HEAD + (new_size + 1) * sizeof(symbol));
if (mem == NULL)
{
lose_s(p);
return NULL;
}
q = (symbol *) (HEAD + (char *) mem);
CAPACITY(q) = new_size;
return q;
}
/* to replace symbols between c_bra and c_ket in z->p by the
s_size symbols at s.
Returns 0 on success, -1 on error.
Also, frees z->p (and sets it to NULL) on error.
*/
extern int
replace_s(struct SN_env * z, int c_bra, int c_ket, int s_size, const symbol * s, int *adjptr)
{
int adjustment;
int len;
if (z->p == NULL)
{
z->p = create_s();
if (z->p == NULL)
return -1;
}
adjustment = s_size - (c_ket - c_bra);
len = SIZE(z->p);
if (adjustment != 0)
{
if (adjustment + len > CAPACITY(z->p))
{
z->p = increase_size(z->p, adjustment + len);
if (z->p == NULL)
return -1;
}
memmove(z->p + c_ket + adjustment,
z->p + c_ket,
(len - c_ket) * sizeof(symbol));
SET_SIZE(z->p, adjustment + len);
z->l += adjustment;
if (z->c >= c_ket)
z->c += adjustment;
else if (z->c > c_bra)
z->c = c_bra;
}
unless(s_size == 0) memmove(z->p + c_bra, s, s_size * sizeof(symbol));
if (adjptr != NULL)
*adjptr = adjustment;
return 0;
}
static int
slice_check(struct SN_env * z)
{
if (z->bra < 0 ||
z->bra > z->ket ||
z->ket > z->l ||
z->p == NULL ||
z->l > SIZE(z->p)) /* this line could be removed */
{
#if 0
fprintf(stderr, "faulty slice operation:\n");
debug(z, -1, 0);
#endif
return -1;
}
return 0;
}
extern int
slice_from_s(struct SN_env * z, int s_size, symbol * s)
{
if (slice_check(z))
return -1;
return replace_s(z, z->bra, z->ket, s_size, s, NULL);
}
extern int
slice_from_v(struct SN_env * z, symbol * p)
{
return slice_from_s(z, SIZE(p), p);
}
extern int
slice_del(struct SN_env * z)
{
return slice_from_s(z, 0, 0);
}
extern int
insert_s(struct SN_env * z, int bra, int ket, int s_size, symbol * s)
{
int adjustment;
if (replace_s(z, bra, ket, s_size, s, &adjustment))
return -1;
if (bra <= z->bra)
z->bra += adjustment;
if (bra <= z->ket)
z->ket += adjustment;
return 0;
}
extern int
insert_v(struct SN_env * z, int bra, int ket, symbol * p)
{
int adjustment;
if (replace_s(z, bra, ket, SIZE(p), p, &adjustment))
return -1;
if (bra <= z->bra)
z->bra += adjustment;
if (bra <= z->ket)
z->ket += adjustment;
return 0;
}
extern symbol *
slice_to(struct SN_env * z, symbol * p)
{
if (slice_check(z))
{
lose_s(p);
return NULL;
}
{
int len = z->ket - z->bra;
if (CAPACITY(p) < len)
{
p = increase_size(p, len);
if (p == NULL)
return NULL;
}
memmove(p, z->p + z->bra, len * sizeof(symbol));
SET_SIZE(p, len);
}
return p;
}
extern symbol *
assign_to(struct SN_env * z, symbol * p)
{
int len = z->l;
if (CAPACITY(p) < len)
{
p = increase_size(p, len);
if (p == NULL)
return NULL;
}
memmove(p, z->p, len * sizeof(symbol));
SET_SIZE(p, len);
return p;
}
#if 0
extern void
debug(struct SN_env * z, int number, int line_count)
{
int i;
int limit = SIZE(z->p);
/* if (number >= 0) printf("%3d (line %4d): '", number, line_count); */
if (number >= 0)
printf("%3d (line %4d): [%d]'", number, line_count, limit);
for (i = 0; i <= limit; i++)
{
if (z->lb == i)
printf("{");
if (z->bra == i)
printf("[");
if (z->c == i)
printf("|");
if (z->ket == i)
printf("]");
if (z->l == i)
printf("}");
if (i < limit)
{
int ch = z->p[i];
if (ch == 0)
ch = '#';
printf("%c", ch);
}
}
printf("'\n");
}
#endif
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