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author | 2023-10-10 11:40:56 +0000 | |
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committer | 2023-10-10 11:40:56 +0000 | |
commit | e02cda008591317b1625707ff8e115a4841aa889 (patch) | |
tree | aee302e3cf8b59ec2d32ec481be3d1afddfc8968 /qobject/qnum.c | |
parent | cc668e6b7e0ffd8c9d130513d12053cf5eda1d3b (diff) |
Introduce Virtio-loopback epsilon release:
Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.
Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9
Diffstat (limited to 'qobject/qnum.c')
-rw-r--r-- | qobject/qnum.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/qobject/qnum.c b/qobject/qnum.c new file mode 100644 index 000000000..5dd66938d --- /dev/null +++ b/qobject/qnum.c @@ -0,0 +1,241 @@ +/* + * QNum Module + * + * Copyright (C) 2009 Red Hat Inc. + * + * Authors: + * Luiz Capitulino <lcapitulino@redhat.com> + * Anthony Liguori <aliguori@us.ibm.com> + * Marc-André Lureau <marcandre.lureau@redhat.com> + * + * This work is licensed under the terms of the GNU LGPL, version 2.1 or later. + * See the COPYING.LIB file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qapi/qmp/qnum.h" +#include "qobject-internal.h" + +/** + * qnum_from_int(): Create a new QNum from an int64_t + * + * Return strong reference. + */ +QNum *qnum_from_int(int64_t value) +{ + QNum *qn = g_new(QNum, 1); + + qobject_init(QOBJECT(qn), QTYPE_QNUM); + qn->kind = QNUM_I64; + qn->u.i64 = value; + + return qn; +} + +/** + * qnum_from_uint(): Create a new QNum from an uint64_t + * + * Return strong reference. + */ +QNum *qnum_from_uint(uint64_t value) +{ + QNum *qn = g_new(QNum, 1); + + qobject_init(QOBJECT(qn), QTYPE_QNUM); + qn->kind = QNUM_U64; + qn->u.u64 = value; + + return qn; +} + +/** + * qnum_from_double(): Create a new QNum from a double + * + * Return strong reference. + */ +QNum *qnum_from_double(double value) +{ + QNum *qn = g_new(QNum, 1); + + qobject_init(QOBJECT(qn), QTYPE_QNUM); + qn->kind = QNUM_DOUBLE; + qn->u.dbl = value; + + return qn; +} + +/** + * qnum_get_try_int(): Get an integer representation of the number + * + * Return true on success. + */ +bool qnum_get_try_int(const QNum *qn, int64_t *val) +{ + switch (qn->kind) { + case QNUM_I64: + *val = qn->u.i64; + return true; + case QNUM_U64: + if (qn->u.u64 > INT64_MAX) { + return false; + } + *val = qn->u.u64; + return true; + case QNUM_DOUBLE: + return false; + } + + assert(0); + return false; +} + +/** + * qnum_get_int(): Get an integer representation of the number + * + * assert() on failure. + */ +int64_t qnum_get_int(const QNum *qn) +{ + int64_t val; + bool success = qnum_get_try_int(qn, &val); + assert(success); + return val; +} + +/** + * qnum_get_uint(): Get an unsigned integer from the number + * + * Return true on success. + */ +bool qnum_get_try_uint(const QNum *qn, uint64_t *val) +{ + switch (qn->kind) { + case QNUM_I64: + if (qn->u.i64 < 0) { + return false; + } + *val = qn->u.i64; + return true; + case QNUM_U64: + *val = qn->u.u64; + return true; + case QNUM_DOUBLE: + return false; + } + + assert(0); + return false; +} + +/** + * qnum_get_uint(): Get an unsigned integer from the number + * + * assert() on failure. + */ +uint64_t qnum_get_uint(const QNum *qn) +{ + uint64_t val; + bool success = qnum_get_try_uint(qn, &val); + assert(success); + return val; +} + +/** + * qnum_get_double(): Get a float representation of the number + * + * qnum_get_double() loses precision for integers beyond 53 bits. + */ +double qnum_get_double(QNum *qn) +{ + switch (qn->kind) { + case QNUM_I64: + return qn->u.i64; + case QNUM_U64: + return qn->u.u64; + case QNUM_DOUBLE: + return qn->u.dbl; + } + + assert(0); + return 0.0; +} + +char *qnum_to_string(QNum *qn) +{ + switch (qn->kind) { + case QNUM_I64: + return g_strdup_printf("%" PRId64, qn->u.i64); + case QNUM_U64: + return g_strdup_printf("%" PRIu64, qn->u.u64); + case QNUM_DOUBLE: + /* 17 digits suffice for IEEE double */ + return g_strdup_printf("%.17g", qn->u.dbl); + } + + assert(0); + return NULL; +} + +/** + * qnum_is_equal(): Test whether the two QNums are equal + * + * Negative integers are never considered equal to unsigned integers, + * but positive integers in the range [0, INT64_MAX] are considered + * equal independently of whether the QNum's kind is i64 or u64. + * + * Doubles are never considered equal to integers. + */ +bool qnum_is_equal(const QObject *x, const QObject *y) +{ + QNum *num_x = qobject_to(QNum, x); + QNum *num_y = qobject_to(QNum, y); + + switch (num_x->kind) { + case QNUM_I64: + switch (num_y->kind) { + case QNUM_I64: + /* Comparison in native int64_t type */ + return num_x->u.i64 == num_y->u.i64; + case QNUM_U64: + /* Implicit conversion of x to uin64_t, so we have to + * check its sign before */ + return num_x->u.i64 >= 0 && num_x->u.i64 == num_y->u.u64; + case QNUM_DOUBLE: + return false; + } + abort(); + case QNUM_U64: + switch (num_y->kind) { + case QNUM_I64: + return qnum_is_equal(y, x); + case QNUM_U64: + /* Comparison in native uint64_t type */ + return num_x->u.u64 == num_y->u.u64; + case QNUM_DOUBLE: + return false; + } + abort(); + case QNUM_DOUBLE: + switch (num_y->kind) { + case QNUM_I64: + case QNUM_U64: + return false; + case QNUM_DOUBLE: + /* Comparison in native double type */ + return num_x->u.dbl == num_y->u.dbl; + } + abort(); + } + + abort(); +} + +/** + * qnum_destroy_obj(): Free all memory allocated by a + * QNum object + */ +void qnum_destroy_obj(QObject *obj) +{ + assert(obj != NULL); + g_free(qobject_to(QNum, obj)); +} |