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![Markus Armbruster](/assets/img/avatar_default.png)
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180823164025.12553-53-armbru@redhat.com>
264 lines
5.8 KiB
C
264 lines
5.8 KiB
C
/*
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* QNum Module
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* Authors:
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* Luiz Capitulino <lcapitulino@redhat.com>
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* Anthony Liguori <aliguori@us.ibm.com>
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* Marc-André Lureau <marcandre.lureau@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/qmp/qnum.h"
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/**
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* qnum_from_int(): Create a new QNum from an int64_t
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*
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* Return strong reference.
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*/
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QNum *qnum_from_int(int64_t value)
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{
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QNum *qn = g_new(QNum, 1);
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qobject_init(QOBJECT(qn), QTYPE_QNUM);
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qn->kind = QNUM_I64;
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qn->u.i64 = value;
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return qn;
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}
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/**
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* qnum_from_uint(): Create a new QNum from an uint64_t
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*
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* Return strong reference.
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*/
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QNum *qnum_from_uint(uint64_t value)
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{
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QNum *qn = g_new(QNum, 1);
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qobject_init(QOBJECT(qn), QTYPE_QNUM);
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qn->kind = QNUM_U64;
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qn->u.u64 = value;
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return qn;
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}
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/**
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* qnum_from_double(): Create a new QNum from a double
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*
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* Return strong reference.
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*/
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QNum *qnum_from_double(double value)
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{
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QNum *qn = g_new(QNum, 1);
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qobject_init(QOBJECT(qn), QTYPE_QNUM);
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qn->kind = QNUM_DOUBLE;
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qn->u.dbl = value;
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return qn;
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}
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/**
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* qnum_get_try_int(): Get an integer representation of the number
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*
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* Return true on success.
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*/
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bool qnum_get_try_int(const QNum *qn, int64_t *val)
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{
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switch (qn->kind) {
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case QNUM_I64:
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*val = qn->u.i64;
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return true;
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case QNUM_U64:
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if (qn->u.u64 > INT64_MAX) {
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return false;
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}
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*val = qn->u.u64;
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return true;
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case QNUM_DOUBLE:
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return false;
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}
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assert(0);
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return false;
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}
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/**
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* qnum_get_int(): Get an integer representation of the number
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*
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* assert() on failure.
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*/
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int64_t qnum_get_int(const QNum *qn)
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{
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int64_t val;
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bool success = qnum_get_try_int(qn, &val);
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assert(success);
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return val;
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}
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/**
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* qnum_get_uint(): Get an unsigned integer from the number
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*
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* Return true on success.
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*/
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bool qnum_get_try_uint(const QNum *qn, uint64_t *val)
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{
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switch (qn->kind) {
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case QNUM_I64:
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if (qn->u.i64 < 0) {
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return false;
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}
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*val = qn->u.i64;
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return true;
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case QNUM_U64:
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*val = qn->u.u64;
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return true;
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case QNUM_DOUBLE:
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return false;
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}
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assert(0);
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return false;
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}
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/**
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* qnum_get_uint(): Get an unsigned integer from the number
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*
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* assert() on failure.
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*/
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uint64_t qnum_get_uint(const QNum *qn)
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{
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uint64_t val;
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bool success = qnum_get_try_uint(qn, &val);
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assert(success);
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return val;
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}
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/**
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* qnum_get_double(): Get a float representation of the number
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*
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* qnum_get_double() loses precision for integers beyond 53 bits.
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*/
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double qnum_get_double(QNum *qn)
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{
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switch (qn->kind) {
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case QNUM_I64:
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return qn->u.i64;
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case QNUM_U64:
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return qn->u.u64;
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case QNUM_DOUBLE:
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return qn->u.dbl;
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}
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assert(0);
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return 0.0;
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}
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char *qnum_to_string(QNum *qn)
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{
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char *buffer;
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int len;
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switch (qn->kind) {
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case QNUM_I64:
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return g_strdup_printf("%" PRId64, qn->u.i64);
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case QNUM_U64:
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return g_strdup_printf("%" PRIu64, qn->u.u64);
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case QNUM_DOUBLE:
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/* FIXME: snprintf() is locale dependent; but JSON requires
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* numbers to be formatted as if in the C locale. Dependence
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* on C locale is a pervasive issue in QEMU. */
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/* FIXME: This risks printing Inf or NaN, which are not valid
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* JSON values. */
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/* FIXME: the default precision of 6 for %f often causes
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* rounding errors; we should be using DBL_DECIMAL_DIG (17),
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* and only rounding to a shorter number if the result would
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* still produce the same floating point value. */
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buffer = g_strdup_printf("%f" , qn->u.dbl);
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len = strlen(buffer);
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while (len > 0 && buffer[len - 1] == '0') {
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len--;
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}
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if (len && buffer[len - 1] == '.') {
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buffer[len - 1] = 0;
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} else {
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buffer[len] = 0;
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}
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return buffer;
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}
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assert(0);
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return NULL;
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}
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/**
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* qnum_is_equal(): Test whether the two QNums are equal
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*
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* Negative integers are never considered equal to unsigned integers,
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* but positive integers in the range [0, INT64_MAX] are considered
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* equal independently of whether the QNum's kind is i64 or u64.
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*
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* Doubles are never considered equal to integers.
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*/
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bool qnum_is_equal(const QObject *x, const QObject *y)
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{
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QNum *num_x = qobject_to(QNum, x);
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QNum *num_y = qobject_to(QNum, y);
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switch (num_x->kind) {
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case QNUM_I64:
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switch (num_y->kind) {
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case QNUM_I64:
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/* Comparison in native int64_t type */
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return num_x->u.i64 == num_y->u.i64;
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case QNUM_U64:
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/* Implicit conversion of x to uin64_t, so we have to
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* check its sign before */
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return num_x->u.i64 >= 0 && num_x->u.i64 == num_y->u.u64;
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case QNUM_DOUBLE:
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return false;
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}
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abort();
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case QNUM_U64:
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switch (num_y->kind) {
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case QNUM_I64:
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return qnum_is_equal(y, x);
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case QNUM_U64:
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/* Comparison in native uint64_t type */
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return num_x->u.u64 == num_y->u.u64;
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case QNUM_DOUBLE:
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return false;
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}
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abort();
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case QNUM_DOUBLE:
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switch (num_y->kind) {
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case QNUM_I64:
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case QNUM_U64:
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return false;
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case QNUM_DOUBLE:
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/* Comparison in native double type */
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return num_x->u.dbl == num_y->u.dbl;
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}
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abort();
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}
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abort();
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}
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/**
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* qnum_destroy_obj(): Free all memory allocated by a
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* QNum object
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*/
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void qnum_destroy_obj(QObject *obj)
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{
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assert(obj != NULL);
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g_free(qobject_to(QNum, obj));
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}
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