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/* This file Copyright 1992 by Clifford A. Adams */
/* scan.c
*
* Scan initialization/cleanup and context control.
*/
/* CLEANUP: make a scontext file for the scan context stuff. */
#include "EXTERN.h"
#include "common.h"
#ifdef SCAN
#include "final.h" /* for assert statements */
#include "util.h" /* allocation */
#include "INTERN.h"
#include "scan.h"
#include "EXTERN.h"
#include "sorder.h"
void
s_init_context(cnum,type)
int cnum,type;
{
SCONTEXT *p;
int i;
/* s_num_contexts not incremented until last moment */
if (cnum < 0 || cnum > s_num_contexts) {
printf("s_init_context: illegal context number %d!\n",cnum) FLUSH;
assert(FALSE);
}
p = s_contexts + cnum;
p->type = type;
p->ent_sort = (long*)NULL;
p->ent_sort_max = -1;
p->ent_sorted_max = -1;
p->ent_index = (long*)NULL;
p->ent_index_max = -1;
p->page_size = MAX_PAGE_SIZE;
p->top_ent = -1;
p->bot_ent = -1;
p->refill = TRUE;
p->ref_all = TRUE;
p->ref_top = TRUE;
p->ref_bot = TRUE;
p->ref_status = -1;
p->ref_desc = -1;
/* next ones should be reset later */
p->top_lines = 0;
p->bot_lines = 0;
p->status_cols = 0;
p->cursor_cols = 0;
p->desc_cols = 0;
p->itemnum_cols = 0;
p->ptr_page_line = 0;
p->flags = 0;
/* clear the page entries */
for (i = 0; i < MAX_PAGE_SIZE; i++) {
p->page_ents[i].entnum = 0;
p->page_ents[i].lines = 0;
p->page_ents[i].start_line = 0;
p->page_ents[i].pageflags = (char)0;
}
}
/* allocate a new context number and initialize it */
int /* context number */
s_new_context(type)
int type; /* context type */
{
int i;
/* check for deleted contexts */
for (i = 0; i < s_num_contexts; i++)
if (s_contexts[i].type == 0) /* deleted context */
break;
if (i < s_num_contexts) { /* a deleted one was found */
s_init_context(i,type);
return i;
}
/* none deleted, so allocate a new one */
i = s_num_contexts;
i++;
if (i == 1) { /* none allocated before */
s_contexts = (SCONTEXT*)safemalloc(sizeof (SCONTEXT));
} else {
s_contexts = (SCONTEXT*)saferealloc((char*)s_contexts,
i * sizeof (SCONTEXT));
}
s_contexts[i-1].page_ents =
(PAGE_ENT*)safemalloc(MAX_PAGE_SIZE*sizeof(PAGE_ENT));
s_init_context(i-1,type);
s_num_contexts++; /* now safe to increment */
return s_num_contexts-1;
}
/* saves the current context */
void
s_save_context()
{
SCONTEXT *p;
p = s_contexts + s_cur_context;
p->type = s_cur_type;
p->page_ents = page_ents;
p->ent_sort = s_ent_sort;
p->ent_sort_max = s_ent_sort_max;
p->ent_sorted_max = s_ent_sorted_max;
p->ent_index = s_ent_index;
p->ent_index_max = s_ent_index_max;
p->page_size = s_page_size;
p->top_ent = s_top_ent;
p->bot_ent = s_bot_ent;
p->refill = s_refill;
p->ref_all = s_ref_all;
p->ref_top = s_ref_top;
p->ref_bot = s_ref_bot;
p->ref_status = s_ref_status;
p->ref_desc = s_ref_desc;
p->top_lines = s_top_lines;
p->bot_lines = s_bot_lines;
p->status_cols = s_status_cols;
p->cursor_cols = s_cursor_cols;
p->desc_cols = s_desc_cols;
p->itemnum_cols = s_itemnum_cols;
p->ptr_page_line = s_ptr_page_line;
p->flags = s_flags;
}
void
s_change_context(newcontext)
int newcontext; /* context number to activate */
{
SCONTEXT *p;
if (newcontext < 0 || newcontext >= s_num_contexts) {
printf("s_change_context: bad context number %d!\n",newcontext) FLUSH;
assert(FALSE);
}
s_cur_context = newcontext;
p = s_contexts + newcontext;
s_cur_type = p->type;
page_ents = p->page_ents;
s_ent_sort = p->ent_sort;
s_ent_sort_max = p->ent_sort_max;
s_ent_sorted_max = p->ent_sorted_max;
s_ent_index = p->ent_index;
s_ent_index_max = p->ent_index_max;
s_page_size = p->page_size;
s_top_ent = p->top_ent;
s_bot_ent = p->bot_ent;
s_refill = p->refill;
s_ref_all = p->ref_all;
s_ref_top = p->ref_top;
s_ref_bot = p->ref_bot;
s_ref_status = p->ref_status;
s_ref_desc = p->ref_desc;
/* next ones should be reset later */
s_top_lines = p->top_lines;
s_bot_lines = p->bot_lines;
s_status_cols = p->status_cols;
s_cursor_cols = p->cursor_cols;
s_desc_cols = p->desc_cols;
s_itemnum_cols = p->itemnum_cols;
s_ptr_page_line = p->ptr_page_line;
s_flags = p->flags;
}
/* implement later? */
void
s_clean_contexts()
{
}
void
s_delete_context(cnum)
int cnum; /* context number to delete */
{
if (cnum < 0 || cnum >= s_num_contexts) {
printf("s_delete_context: illegal context number %d!\n",cnum) FLUSH;
assert(FALSE);
}
s_order_clean();
/* mark the context as empty */
s_contexts[cnum].type = 0;
}
#endif /* SCAN */
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