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list.c
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#include "Header.h"
#include "Io.h" /* for read_term() */
#include "List.h"
/*
* memory management
*/
static Gen_ptr_ptr gen_ptr_avail;
static long gen_ptr_gets, gen_ptr_frees, gen_ptr_avails;
/*************
*
* Gen_ptr_ptr get_gen_ptr()
*
*************/
Gen_ptr_ptr get_gen_ptr(void)
{
Gen_ptr_ptr p;
gen_ptr_gets++;
if (!gen_ptr_avail)
p = tp_alloc(sizeof(struct gen_ptr));
else {
gen_ptr_avails--;
p = gen_ptr_avail;
gen_ptr_avail = gen_ptr_avail->next;
}
p->u.t = NULL;
p->next = NULL;
return(p);
} /* get_gen_ptr */
/*************
*
* free_gen_ptr()
*
*************/
void free_gen_ptr(Gen_ptr_ptr p)
{
gen_ptr_frees++;
gen_ptr_avails++;
p->next = gen_ptr_avail;
gen_ptr_avail = p;
} /* free_gen_ptr */
/*************
*
* print_list_mem()
*
*************/
void print_list_mem(FILE *fp, int heading)
{
if (heading)
fprintf(fp, " type (bytes each) gets frees in use avail bytes\n");
fprintf(fp, "gen_ptr (%4d) %11ld%11ld%11ld%11ld%9.1f K\n", sizeof(struct gen_ptr), gen_ptr_gets, gen_ptr_frees, gen_ptr_gets - gen_ptr_frees, gen_ptr_avails, (((gen_ptr_gets - gen_ptr_frees) + gen_ptr_avails) * sizeof(struct gen_ptr)) / 1024.);
} /* print_list_mem */
/*************
*
* p_list_mem()
*
*************/
void p_list_mem()
{
print_list_mem(stdout, 1);
} /* p_list_mem */
/*
* end of memory management
*/
/*************
*
* reverse_gen_list(p1, p2)
*
*************/
Gen_ptr_ptr reverse_gen_list(Gen_ptr_ptr p1, Gen_ptr_ptr p2)
{
Gen_ptr_ptr p3;
if (!p1)
return(p2);
else {
p3 = p1->next;
p1->next = p2;
return(reverse_gen_list(p3, p1));
}
} /* reverse_gen_list */
/*************
*
* copy_gen_ptr_list(p)
*
*************/
Gen_ptr_ptr copy_gen_ptr_list(Gen_ptr_ptr p)
{
Gen_ptr_ptr start, p1, p2;
start = NULL;
p2 = NULL;
for ( ; p; p = p->next) {
p1 = get_gen_ptr();
p1->u.v = p->u.v;
if (p2)
p2->next = p1;
else
start = p1;
p2 = p1;
}
return(start);
} /* copy_gen_ptr_list */
/*************
*
* gen_ptr_count()
*
*************/
int gen_ptr_count(Gen_ptr_ptr p)
{
int n;
for (n = 0; p; p = p->next, n++);
return(n);
} /* gen_ptr_count */
/*************
*
* Gen_ptr_ptr read_list(file_ptr, errors_ptr, integrate)
*
* Read and return a list of terms.
*
* The list must be terminated either with the term `end_of_list.'
* or with an actual EOF.
* Set errors_ptr to point to the number of errors found.
*
*************/
Gen_ptr_ptr read_list(FILE *fp, int *ep)
{
Gen_ptr_ptr p1, p2, p3;
Term_ptr t;
int rc;
*ep = 0;
p3 = NULL;
p2 = NULL;
t = read_term(fp, &rc);
while (rc == 0) {
(*ep)++;
t = read_term(fp, &rc);
}
/* keep going until t == NULL || t is end marker */
while (t && (t->arity != 0 ||
!str_ident(sn_to_str(t->symbol), "end_of_list"))) {
set_vars(t);
p1 = get_gen_ptr();
p1->u.t = t;
if (p2 == NULL)
p3 = p1;
else
p2->next = p1;
p2 = p1;
t = read_term(fp, &rc);
while (rc == 0) {
(*ep)++;
t = read_term(fp, &rc);
}
}
if (!t)
return(p3);
else {
zap_term(t);
return(p3);
}
} /* read_list */