mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-21 08:29:39 +08:00
657 lines
11 KiB
C
657 lines
11 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "header.h"
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#define unless(C) if(!(C))
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#define CREATE_SIZE 1
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extern symbol *
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create_s(void)
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{
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symbol *p;
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void *mem = malloc(HEAD + (CREATE_SIZE + 1) * sizeof(symbol));
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if (mem == NULL)
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return NULL;
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p = (symbol *) (HEAD + (char *) mem);
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CAPACITY(p) = CREATE_SIZE;
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SET_SIZE(p, CREATE_SIZE);
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return p;
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}
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extern void
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lose_s(symbol * p)
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{
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if (p == NULL)
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return;
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free((char *) p - HEAD);
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}
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/*
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new_p = X_skip_utf8(p, c, lb, l, n); skips n characters forwards from p + c
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if n +ve, or n characters backwards from p +c - 1 if n -ve. new_p is the new
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position, or 0 on failure.
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-- used to implement hop and next in the utf8 case.
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*/
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extern int
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skip_utf8(const symbol * p, int c, int lb, int l, int n)
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{
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int b;
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if (n >= 0)
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{
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for (; n > 0; n--)
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{
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if (c >= l)
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return -1;
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b = p[c++];
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if (b >= 0xC0)
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{ /* 1100 0000 */
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while (c < l)
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{
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b = p[c];
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if (b >= 0xC0 || b < 0x80)
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break;
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/* break unless b is 10------ */
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c++;
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}
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}
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}
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}
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else
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{
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for (; n < 0; n++)
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{
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if (c <= lb)
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return -1;
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b = p[--c];
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if (b >= 0x80)
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{ /* 1000 0000 */
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while (c > lb)
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{
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b = p[c];
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if (b >= 0xC0)
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break; /* 1100 0000 */
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c--;
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}
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}
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}
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}
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return c;
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}
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/* Code for character groupings: utf8 cases */
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static int
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get_utf8(const symbol * p, int c, int l, int *slot)
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{
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int b0,
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b1;
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if (c >= l)
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return 0;
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b0 = p[c++];
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if (b0 < 0xC0 || c == l)
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{ /* 1100 0000 */
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*slot = b0;
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return 1;
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}
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b1 = p[c++];
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if (b0 < 0xE0 || c == l)
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{ /* 1110 0000 */
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*slot = (b0 & 0x1F) << 6 | (b1 & 0x3F);
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return 2;
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}
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*slot = (b0 & 0xF) << 12 | (b1 & 0x3F) << 6 | (*p & 0x3F);
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return 3;
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}
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static int
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get_b_utf8(const symbol * p, int c, int lb, int *slot)
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{
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int b0,
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b1;
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if (c <= lb)
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return 0;
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b0 = p[--c];
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if (b0 < 0x80 || c == lb)
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{ /* 1000 0000 */
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*slot = b0;
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return 1;
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}
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b1 = p[--c];
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if (b1 >= 0xC0 || c == lb)
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{ /* 1100 0000 */
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*slot = (b1 & 0x1F) << 6 | (b0 & 0x3F);
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return 2;
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}
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*slot = (*p & 0xF) << 12 | (b1 & 0x3F) << 6 | (b0 & 0x3F);
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return 3;
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}
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extern int
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in_grouping_U(struct SN_env * z, unsigned char *s, int min, int max)
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{
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int ch;
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int w = get_utf8(z->p, z->c, z->l, &ch);
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unless(w) return 0;
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if (ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0)
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return 0;
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z->c += w;
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return 1;
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}
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extern int
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in_grouping_b_U(struct SN_env * z, unsigned char *s, int min, int max)
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{
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int ch;
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int w = get_b_utf8(z->p, z->c, z->lb, &ch);
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unless(w) return 0;
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if (ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0)
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return 0;
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z->c -= w;
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return 1;
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}
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extern int
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out_grouping_U(struct SN_env * z, unsigned char *s, int min, int max)
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{
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int ch;
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int w = get_utf8(z->p, z->c, z->l, &ch);
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unless(w) return 0;
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unless(ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0) return 0;
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z->c += w;
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return 1;
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}
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extern int
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out_grouping_b_U(struct SN_env * z, unsigned char *s, int min, int max)
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{
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int ch;
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int w = get_b_utf8(z->p, z->c, z->lb, &ch);
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unless(w) return 0;
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unless(ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0) return 0;
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z->c -= w;
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return 1;
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}
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/* Code for character groupings: non-utf8 cases */
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extern int
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in_grouping(struct SN_env * z, unsigned char *s, int min, int max)
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{
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int ch;
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if (z->c >= z->l)
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return 0;
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ch = z->p[z->c];
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if (ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0)
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return 0;
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z->c++;
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return 1;
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}
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extern int
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in_grouping_b(struct SN_env * z, unsigned char *s, int min, int max)
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{
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int ch;
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if (z->c <= z->lb)
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return 0;
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ch = z->p[z->c - 1];
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if (ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0)
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return 0;
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z->c--;
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return 1;
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}
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extern int
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out_grouping(struct SN_env * z, unsigned char *s, int min, int max)
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{
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int ch;
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if (z->c >= z->l)
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return 0;
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ch = z->p[z->c];
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unless(ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0) return 0;
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z->c++;
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return 1;
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}
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extern int
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out_grouping_b(struct SN_env * z, unsigned char *s, int min, int max)
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{
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int ch;
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if (z->c <= z->lb)
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return 0;
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ch = z->p[z->c - 1];
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unless(ch > max || (ch -= min) < 0 || (s[ch >> 3] & (0X1 << (ch & 0X7))) == 0) return 0;
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z->c--;
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return 1;
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}
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extern int
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eq_s(struct SN_env * z, int s_size, symbol * s)
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{
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if (z->l - z->c < s_size || memcmp(z->p + z->c, s, s_size * sizeof(symbol)) != 0)
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return 0;
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z->c += s_size;
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return 1;
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}
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extern int
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eq_s_b(struct SN_env * z, int s_size, symbol * s)
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{
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if (z->c - z->lb < s_size || memcmp(z->p + z->c - s_size, s, s_size * sizeof(symbol)) != 0)
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return 0;
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z->c -= s_size;
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return 1;
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}
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extern int
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eq_v(struct SN_env * z, symbol * p)
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{
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return eq_s(z, SIZE(p), p);
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}
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extern int
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eq_v_b(struct SN_env * z, symbol * p)
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{
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return eq_s_b(z, SIZE(p), p);
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}
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extern int
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find_among(struct SN_env * z, struct among * v, int v_size)
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{
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int i = 0;
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int j = v_size;
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int c = z->c;
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int l = z->l;
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symbol *q = z->p + c;
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struct among *w;
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int common_i = 0;
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int common_j = 0;
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int first_key_inspected = 0;
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while (1)
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{
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int k = i + ((j - i) >> 1);
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int diff = 0;
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int common = common_i < common_j ? common_i : common_j; /* smaller */
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w = v + k;
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{
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int i;
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for (i = common; i < w->s_size; i++)
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{
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if (c + common == l)
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{
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diff = -1;
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break;
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}
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diff = q[common] - w->s[i];
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if (diff != 0)
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break;
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common++;
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}
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}
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if (diff < 0)
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{
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j = k;
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common_j = common;
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}
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else
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{
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i = k;
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common_i = common;
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}
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if (j - i <= 1)
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{
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if (i > 0)
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break; /* v->s has been inspected */
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if (j == i)
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break; /* only one item in v */
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/*
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* - but now we need to go round once more to get v->s inspected.
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* This looks messy, but is actually the optimal approach.
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*/
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if (first_key_inspected)
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break;
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first_key_inspected = 1;
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}
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}
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while (1)
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{
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w = v + i;
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if (common_i >= w->s_size)
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{
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z->c = c + w->s_size;
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if (w->function == 0)
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return w->result;
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{
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int res = w->function(z);
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z->c = c + w->s_size;
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if (res)
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return w->result;
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}
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}
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i = w->substring_i;
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if (i < 0)
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return 0;
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}
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}
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/* find_among_b is for backwards processing. Same comments apply */
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extern int
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find_among_b(struct SN_env * z, struct among * v, int v_size)
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{
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int i = 0;
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int j = v_size;
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int c = z->c;
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int lb = z->lb;
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symbol *q = z->p + c - 1;
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struct among *w;
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int common_i = 0;
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int common_j = 0;
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int first_key_inspected = 0;
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while (1)
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{
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int k = i + ((j - i) >> 1);
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int diff = 0;
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int common = common_i < common_j ? common_i : common_j;
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w = v + k;
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{
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int i;
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for (i = w->s_size - 1 - common; i >= 0; i--)
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{
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if (c - common == lb)
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{
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diff = -1;
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break;
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}
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diff = q[-common] - w->s[i];
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if (diff != 0)
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break;
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common++;
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}
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}
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if (diff < 0)
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{
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j = k;
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common_j = common;
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}
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else
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{
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i = k;
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common_i = common;
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}
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if (j - i <= 1)
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{
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if (i > 0)
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break;
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if (j == i)
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break;
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if (first_key_inspected)
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break;
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first_key_inspected = 1;
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}
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}
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while (1)
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{
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w = v + i;
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if (common_i >= w->s_size)
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{
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z->c = c - w->s_size;
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if (w->function == 0)
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return w->result;
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{
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int res = w->function(z);
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z->c = c - w->s_size;
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if (res)
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return w->result;
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}
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}
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i = w->substring_i;
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if (i < 0)
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return 0;
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}
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}
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/* Increase the size of the buffer pointed to by p to at least n symbols.
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* If insufficient memory, returns NULL and frees the old buffer.
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*/
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static symbol *
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increase_size(symbol * p, int n)
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{
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symbol *q;
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int new_size = n + 20;
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void *mem = realloc((char *) p - HEAD,
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HEAD + (new_size + 1) * sizeof(symbol));
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if (mem == NULL)
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{
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lose_s(p);
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return NULL;
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}
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q = (symbol *) (HEAD + (char *) mem);
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CAPACITY(q) = new_size;
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return q;
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}
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/* to replace symbols between c_bra and c_ket in z->p by the
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s_size symbols at s.
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Returns 0 on success, -1 on error.
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Also, frees z->p (and sets it to NULL) on error.
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*/
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extern int
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replace_s(struct SN_env * z, int c_bra, int c_ket, int s_size, const symbol * s, int *adjptr)
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{
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int adjustment;
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int len;
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if (z->p == NULL)
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{
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z->p = create_s();
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if (z->p == NULL)
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return -1;
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}
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adjustment = s_size - (c_ket - c_bra);
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len = SIZE(z->p);
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if (adjustment != 0)
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{
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if (adjustment + len > CAPACITY(z->p))
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{
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z->p = increase_size(z->p, adjustment + len);
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if (z->p == NULL)
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return -1;
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}
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memmove(z->p + c_ket + adjustment,
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z->p + c_ket,
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(len - c_ket) * sizeof(symbol));
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SET_SIZE(z->p, adjustment + len);
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z->l += adjustment;
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if (z->c >= c_ket)
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z->c += adjustment;
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else if (z->c > c_bra)
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z->c = c_bra;
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}
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unless(s_size == 0) memmove(z->p + c_bra, s, s_size * sizeof(symbol));
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if (adjptr != NULL)
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*adjptr = adjustment;
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return 0;
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}
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static int
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slice_check(struct SN_env * z)
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{
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if (z->bra < 0 ||
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z->bra > z->ket ||
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z->ket > z->l ||
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z->p == NULL ||
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z->l > SIZE(z->p)) /* this line could be removed */
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{
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#if 0
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fprintf(stderr, "faulty slice operation:\n");
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debug(z, -1, 0);
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#endif
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return -1;
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}
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return 0;
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}
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extern int
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slice_from_s(struct SN_env * z, int s_size, symbol * s)
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{
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if (slice_check(z))
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return -1;
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return replace_s(z, z->bra, z->ket, s_size, s, NULL);
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}
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extern int
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slice_from_v(struct SN_env * z, symbol * p)
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{
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return slice_from_s(z, SIZE(p), p);
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}
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extern int
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slice_del(struct SN_env * z)
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{
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return slice_from_s(z, 0, 0);
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}
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extern int
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insert_s(struct SN_env * z, int bra, int ket, int s_size, symbol * s)
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{
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int adjustment;
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if (replace_s(z, bra, ket, s_size, s, &adjustment))
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return -1;
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if (bra <= z->bra)
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z->bra += adjustment;
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if (bra <= z->ket)
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z->ket += adjustment;
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return 0;
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}
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extern int
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insert_v(struct SN_env * z, int bra, int ket, symbol * p)
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{
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int adjustment;
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if (replace_s(z, bra, ket, SIZE(p), p, &adjustment))
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return -1;
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if (bra <= z->bra)
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z->bra += adjustment;
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if (bra <= z->ket)
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z->ket += adjustment;
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return 0;
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}
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extern symbol *
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slice_to(struct SN_env * z, symbol * p)
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|
{
|
|
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
|