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/*
Copyright (C) 2021 Fredrik Johansson
This file is part of Calcium.
Calcium is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "fexpr.h"
#include "fexpr_builtin.h"
char * fexpr_get_string(const fexpr_t expr)
{
char * res;
slong i, len;
ulong head = expr->data[0];
if (FEXPR_TYPE(head) == FEXPR_TYPE_SMALL_STRING)
{
res = flint_malloc(FEXPR_SMALL_SYMBOL_LEN + 1);
res[FEXPR_SMALL_SYMBOL_LEN] = '\0';
for (i = 0; i < FEXPR_SMALL_SYMBOL_LEN; i++)
{
res[i] = (head >> ((i + 1) * 8));
if (res[i] == '\0')
break;
}
}
else if (FEXPR_TYPE(head) == FEXPR_TYPE_BIG_STRING)
{
len = strlen((const char *) (expr->data + 1));
res = flint_malloc(len + 1);
memcpy(res, (const char *) (expr->data + 1), len + 1);
}
else
{
flint_printf("fexpr_get_string: a string is required\n");
flint_abort();
}
return res;
}
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