/**
 * @file convert.c
 * @brief Implements strict string-to-number conversion over strtoll/strtod.
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include <akerror.h>

#include <akbasic/convert.h>
#include <akbasic/error.h>

akerr_ErrorContext *akbasic_str_to_int64(const char *str, int base, int64_t *dest)
{
    PREPARE_ERROR(errctx);
    char *endptr = NULL;
    long long result = 0;

    FAIL_ZERO_RETURN(errctx, (str != NULL), AKERR_NULLPOINTER,
		     "NULL string in integer conversion");
    FAIL_ZERO_RETURN(errctx, (dest != NULL), AKERR_NULLPOINTER,
		     "NULL destination in integer conversion");

    errno = 0;
    result = strtoll(str, &endptr, base);

    /* No digits consumed at all. */
    FAIL_NONZERO_RETURN(errctx, (endptr == str), AKBASIC_ERR_VALUE,
			"INTEGER CONVERSION ON '%s'", str);
    /* Trailing junk. The whole lexeme must be the number. */
    FAIL_NONZERO_RETURN(errctx, (*endptr != '\0'), AKBASIC_ERR_VALUE,
			"INTEGER CONVERSION ON '%s'", str);
    FAIL_NONZERO_RETURN(errctx, (errno == ERANGE), ERANGE,
			"Integer literal '%s' is out of range", str);

    *dest = (int64_t)result;
    SUCCEED_RETURN(errctx);
}

akerr_ErrorContext *akbasic_str_to_double(const char *str, double *dest)
{
    PREPARE_ERROR(errctx);
    char *endptr = NULL;
    double result = 0.0;

    FAIL_ZERO_RETURN(errctx, (str != NULL), AKERR_NULLPOINTER,
		     "NULL string in float conversion");
    FAIL_ZERO_RETURN(errctx, (dest != NULL), AKERR_NULLPOINTER,
		     "NULL destination in float conversion");

    errno = 0;
    result = strtod(str, &endptr);

    FAIL_NONZERO_RETURN(errctx, (endptr == str), AKBASIC_ERR_VALUE,
			"FLOAT CONVERSION ON '%s'", str);
    FAIL_NONZERO_RETURN(errctx, (*endptr != '\0'), AKBASIC_ERR_VALUE,
			"FLOAT CONVERSION ON '%s'", str);
    FAIL_NONZERO_RETURN(errctx, (errno == ERANGE), ERANGE,
			"Float literal '%s' is out of range", str);

    *dest = result;
    SUCCEED_RETURN(errctx);
}