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json: learn to parse uint64 numbers

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Switch strtoll() usage to qemu_strtoi64() helper while at it.

Add a few tests for large numbers.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20170607163635.17635-11-marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-06-07 20:36:02 +04:00 committed by Markus Armbruster
parent 61a8f418b2
commit 2bc7cfea09
3 changed files with 76 additions and 8 deletions
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4
qobject/json-lexer.c
View File

@ -227,15 +227,18 @@ static const uint8_t json_lexer[][256] = {
/* escape */
[IN_ESCAPE_LL] = {
['d'] = JSON_ESCAPE,
['u'] = JSON_ESCAPE,
},
[IN_ESCAPE_L] = {
['d'] = JSON_ESCAPE,
['l'] = IN_ESCAPE_LL,
['u'] = JSON_ESCAPE,
},
[IN_ESCAPE_I64] = {
['d'] = JSON_ESCAPE,
['u'] = JSON_ESCAPE,
},
[IN_ESCAPE_I6] = {
@ -251,6 +254,7 @@ static const uint8_t json_lexer[][256] = {
['i'] = JSON_ESCAPE,
['p'] = JSON_ESCAPE,
['s'] = JSON_ESCAPE,
['u'] = JSON_ESCAPE,
['f'] = JSON_ESCAPE,
['l'] = IN_ESCAPE_L,
['I'] = IN_ESCAPE_I,

36
qobject/json-parser.c
View File

@ -12,6 +12,7 @@
*/
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "qapi/qmp/types.h"
@ -472,6 +473,13 @@ static QObject *parse_escape(JSONParserContext *ctxt, va_list *ap)
} else if (!strcmp(token->str, "%lld") ||
!strcmp(token->str, "%I64d")) {
return QOBJECT(qnum_from_int(va_arg(*ap, long long)));
} else if (!strcmp(token->str, "%u")) {
return QOBJECT(qnum_from_uint(va_arg(*ap, unsigned int)));
} else if (!strcmp(token->str, "%lu")) {
return QOBJECT(qnum_from_uint(va_arg(*ap, unsigned long)));
} else if (!strcmp(token->str, "%llu") ||
!strcmp(token->str, "%I64u")) {
return QOBJECT(qnum_from_uint(va_arg(*ap, unsigned long long)));
} else if (!strcmp(token->str, "%s")) {
return QOBJECT(qstring_from_str(va_arg(*ap, const char *)));
} else if (!strcmp(token->str, "%f")) {
@ -493,21 +501,33 @@ static QObject *parse_literal(JSONParserContext *ctxt)
case JSON_INTEGER: {
/*
* Represent JSON_INTEGER as QNUM_I64 if possible, else as
* QNUM_DOUBLE. Note that strtoll() fails with ERANGE when
* it's not possible.
* QNUM_U64, else as QNUM_DOUBLE. Note that qemu_strtoi64()
* and qemu_strtou64() fail with ERANGE when it's not
* possible.
*
* qnum_get_int() will then work for any signed 64-bit
* JSON_INTEGER, and qnum_get_double() both for any
* JSON_INTEGER and any JSON_FLOAT (with precision loss for
* integers beyond 53 bits)
* JSON_INTEGER, qnum_get_uint() for any unsigned 64-bit
* integer, and qnum_get_double() both for any JSON_INTEGER
* and any JSON_FLOAT (with precision loss for integers beyond
* 53 bits)
*/
int ret;
int64_t value;
uint64_t uvalue;
errno = 0; /* strtoll doesn't set errno on success */
value = strtoll(token->str, NULL, 10);
if (errno != ERANGE) {
ret = qemu_strtoi64(token->str, NULL, 10, &value);
if (!ret) {
return QOBJECT(qnum_from_int(value));
}
assert(ret == -ERANGE);
if (token->str[0] != '-') {
ret = qemu_strtou64(token->str, NULL, 10, &uvalue);
if (!ret) {
return QOBJECT(qnum_from_uint(uvalue));
}
assert(ret == -ERANGE);
}
/* fall through to JSON_FLOAT */
}
case JSON_FLOAT:

44
tests/check-qjson.c
View File

@ -906,6 +906,49 @@ static void simple_number(void)
}
}
static void large_number(void)
{
const char *maxu64 = "18446744073709551615"; /* 2^64-1 */
const char *gtu64 = "18446744073709551616"; /* 2^64 */
const char *lti64 = "-9223372036854775809"; /* -2^63 - 1 */
QNum *qnum;
QString *str;
uint64_t val;
int64_t ival;
qnum = qobject_to_qnum(qobject_from_json(maxu64, &error_abort));
g_assert(qnum);
g_assert_cmpuint(qnum_get_uint(qnum), ==, 18446744073709551615U);
g_assert(!qnum_get_try_int(qnum, &ival));
str = qobject_to_json(QOBJECT(qnum));
g_assert_cmpstr(qstring_get_str(str), ==, maxu64);
QDECREF(str);
QDECREF(qnum);
qnum = qobject_to_qnum(qobject_from_json(gtu64, &error_abort));
g_assert(qnum);
g_assert_cmpfloat(qnum_get_double(qnum), ==, 18446744073709552e3);
g_assert(!qnum_get_try_uint(qnum, &val));
g_assert(!qnum_get_try_int(qnum, &ival));
str = qobject_to_json(QOBJECT(qnum));
g_assert_cmpstr(qstring_get_str(str), ==, gtu64);
QDECREF(str);
QDECREF(qnum);
qnum = qobject_to_qnum(qobject_from_json(lti64, &error_abort));
g_assert(qnum);
g_assert_cmpfloat(qnum_get_double(qnum), ==, -92233720368547758e2);
g_assert(!qnum_get_try_uint(qnum, &val));
g_assert(!qnum_get_try_int(qnum, &ival));
str = qobject_to_json(QOBJECT(qnum));
g_assert_cmpstr(qstring_get_str(str), ==, "-9223372036854775808");
QDECREF(str);
QDECREF(qnum);
}
static void float_number(void)
{
int i;
@ -1475,6 +1518,7 @@ int main(int argc, char **argv)
g_test_add_func("/literals/string/vararg", vararg_string);
g_test_add_func("/literals/number/simple", simple_number);
g_test_add_func("/literals/number/large", large_number);
g_test_add_func("/literals/number/float", float_number);
g_test_add_func("/literals/number/vararg", vararg_number);