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#include <stdlib.h> /* for calloc, free */
#include "header.h"
extern struct SN_env *
SN_create_env(int S_size, int I_size, int B_size)
{
struct SN_env *z = (struct SN_env *) calloc(1, sizeof(struct SN_env));
if (z == NULL)
return NULL;
z->p = create_s();
if (z->p == NULL)
goto error;
if (S_size)
{
int i;
z->S = (symbol * *) calloc(S_size, sizeof(symbol *));
if (z->S == NULL)
goto error;
for (i = 0; i < S_size; i++)
{
z->S[i] = create_s();
if (z->S[i] == NULL)
goto error;
}
z->S_size = S_size;
}
if (I_size)
{
z->I = (int *) calloc(I_size, sizeof(int));
if (z->I == NULL)
goto error;
z->I_size = I_size;
}
if (B_size)
{
z->B = (symbol *) calloc(B_size, sizeof(symbol));
if (z->B == NULL)
goto error;
z->B_size = B_size;
}
return z;
error:
SN_close_env(z);
return NULL;
}
extern void
SN_close_env(struct SN_env * z)
{
if (z == NULL)
return;
if (z->S_size)
{
int i;
for (i = 0; i < z->S_size; i++)
{
lose_s(z->S[i]);
}
free(z->S);
}
if (z->I_size)
free(z->I);
if (z->B_size)
free(z->B);
if (z->p)
lose_s(z->p);
free(z);
}
extern int
SN_set_current(struct SN_env * z, int size, const symbol * s)
{
int err = replace_s(z, 0, z->l, size, s, NULL);
z->c = 0;
return err;
}
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