void
mpd_copy(mpd_t *result, const mpd_t *a, mpd_context_t *ctx)
{
uint32_t status = 0;
if (!mpd_qcopy(result, a, &status)) {
mpd_addstatus_raise(ctx, status);
}
}
/* Round a number to prec digits. The adjusted exponent stays the same
or increases by one if rounding up crosses a power of ten boundary.
If result->digits would exceed MPD_MAX_PREC+1, MPD_Invalid_operation
is set and the result is NaN. */
static inline void
_mpd_round(mpd_t *result, const mpd_t *a, mpd_ssize_t prec,
const mpd_context_t *ctx, uint32_t *status)
{
mpd_ssize_t exp = a->exp + a->digits - prec;
if (prec <= 0) {
mpd_seterror(result, MPD_Invalid_operation, status); /* GCOV_NOT_REACHED */
return; /* GCOV_NOT_REACHED */
}
if (mpd_isspecial(a) || mpd_iszero(a)) {
mpd_qcopy(result, a, status); /* GCOV_NOT_REACHED */
return; /* GCOV_NOT_REACHED */
}
mpd_qrescale_fmt(result, a, exp, ctx, status);
if (result->digits > prec) {
mpd_qrescale_fmt(result, result, exp+1, ctx, status);
}
}
/*
* Return the string representation of an mpd_t, formatted according to 'spec'.
* The format specification is assumed to be valid. Memory errors are indicated
* as usual. This function is quiet.
*/
char *
mpd_qformat_spec(const mpd_t *dec, const mpd_spec_t *spec,
const mpd_context_t *ctx, uint32_t *status)
{
mpd_uint_t dt[MPD_MINALLOC_MAX];
mpd_t tmp = {MPD_STATIC|MPD_STATIC_DATA,0,0,0,MPD_MINALLOC_MAX,dt};
mpd_ssize_t dplace = MPD_DEFAULT_DOTPLACE;
mpd_mbstr_t result;
mpd_spec_t stackspec;
char type = spec->type;
int flags = 0;
if (spec->min_width > MPD_MAX_PREC) {
*status |= MPD_Invalid_operation;
return NULL;
}
if (isupper((uchar)type)) {
type = tolower((uchar)type);
flags |= MPD_FMT_UPPER;
}
if (spec->sign == ' ') {
flags |= MPD_FMT_SIGN_SPACE;
}
else if (spec->sign == '+') {
flags |= MPD_FMT_SIGN_PLUS;
}
if (mpd_isspecial(dec)) {
if (spec->align == 'z') {
stackspec = *spec;
stackspec.fill[0] = ' ';
stackspec.fill[1] = '\0';
stackspec.align = '>';
spec = &stackspec;
}
}
else {
uint32_t workstatus = 0;
mpd_ssize_t prec;
switch (type) {
case 'g': flags |= MPD_FMT_TOSCI; break;
case 'e': flags |= MPD_FMT_EXP; break;
case '%': flags |= MPD_FMT_PERCENT;
if (!mpd_qcopy(&tmp, dec, status)) {
return NULL;
}
tmp.exp += 2;
dec = &tmp;
type = 'f'; /* fall through */
case 'f': flags |= MPD_FMT_FIXED; break;
default: abort(); /* debug: GCOV_NOT_REACHED */
}
if (spec->prec >= 0) {
if (spec->prec > MPD_MAX_PREC) {
*status |= MPD_Invalid_operation;
goto error;
}
switch (type) {
case 'g':
prec = (spec->prec == 0) ? 1 : spec->prec;
if (dec->digits > prec) {
_mpd_round(&tmp, dec, prec, ctx,
&workstatus);
dec = &tmp;
}
break;
case 'e':
if (mpd_iszero(dec)) {
dplace = 1-spec->prec;
}
else {
_mpd_round(&tmp, dec, spec->prec+1, ctx,
&workstatus);
dec = &tmp;
}
break;
case 'f':
mpd_qrescale(&tmp, dec, -spec->prec, ctx,
&workstatus);
dec = &tmp;
break;
}
}
if (type == 'f') {
if (mpd_iszero(dec) && dec->exp > 0) {
mpd_qrescale(&tmp, dec, 0, ctx, &workstatus);
dec = &tmp;
}
}
if (workstatus&MPD_Errors) {
*status |= (workstatus&MPD_Errors);
goto error;
}
}
/*
* At this point, for all scaled or non-scaled decimals:
* 1) 1 <= digits <= MAX_PREC+1
* 2) adjexp(scaled) = adjexp(orig) [+1]
* 3) case 'g': MIN_ETINY <= exp <= MAX_EMAX+1
* case 'e': MIN_ETINY-MAX_PREC <= exp <= MAX_EMAX+1
* case 'f': MIN_ETINY <= exp <= MAX_EMAX+1
* 4) max memory alloc in _mpd_to_string:
* case 'g': MAX_PREC+36
* case 'e': MAX_PREC+36
* case 'f': 2*MPD_MAX_PREC+30
*/
result.nbytes = _mpd_to_string(&result.data, dec, flags, dplace);
result.nchars = result.nbytes;
if (result.nbytes < 0) {
*status |= MPD_Malloc_error;
goto error;
}
if (*spec->dot != '\0' && !mpd_isspecial(dec)) {
if (result.nchars > MPD_MAX_PREC+36) {
/* Since a group length of one is not explicitly
* disallowed, ensure that it is always possible to
* insert a four byte separator after each digit. */
*status |= MPD_Invalid_operation;
mpd_free(result.data);
goto error;
}
if (!_mpd_apply_lconv(&result, spec, status)) {
goto error;
}
}
if (spec->min_width) {
if (!_mpd_add_pad(&result, spec, status)) {
goto error;
}
}
mpd_del(&tmp);
return result.data;
error:
mpd_del(&tmp);
return NULL;
}