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Add API for adding number with fix decimal places 

Signed-off-by: Ajay Bhargav <contact@rickeyworld.info>
This commit is contained in:
Ajay Bhargav 2020-02-03 20:34:53 +05:30 committed by Ajay Bhargav
parent b45f48e600
commit 7d89f84712
2 changed files with 38 additions and 7 deletions
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42
cJSON.c
View File

@ -568,14 +568,20 @@ static cJSON_bool print_number(const cJSON * const item, printbuffer * const out
}
else
{
/* Try 15 decimal places of precision to avoid nonsignificant nonzero digits */
length = sprintf((char*)number_buffer, "%1.15g", d);
/* If decimal places are present and value is not an integer type */
if (item->decimal_places && (ceil(d) != d)) {
/* Then convert it to string */
length = sprintf((char*) number_buffer, "%.*f", item->decimal_places, d);
} else {
/* Try 15 decimal places of precision to avoid nonsignificant nonzero digits */
length = sprintf((char*)number_buffer, "%1.15g", d);
/* Check whether the original double can be recovered */
if ((sscanf((char*)number_buffer, "%lg", &test) != 1) || !compare_double((double)test, d))
{
/* If not, print with 17 decimal places of precision */
length = sprintf((char*)number_buffer, "%1.17g", d);
/* Check whether the original double can be recovered */
if ((sscanf((char*)number_buffer, "%lg", &test) != 1) || !compare_double((double)test, d))
{
/* If not, print with 17 decimal places of precision */
length = sprintf((char*)number_buffer, "%1.17g", d);
}
}
}
@ -2136,6 +2142,28 @@ CJSON_PUBLIC(cJSON*) cJSON_AddNumberToObject(cJSON * const object, const char *
return NULL;
}
CJSON_PUBLIC(cJSON*) cJSON_AddNumberWithPrecisionToObject(cJSON * const object, const char * const name, const double n, int decimal_places)
{
cJSON *number_item;
if (decimal_places <= 0 || decimal_places > 14)
{
return NULL;
}
number_item = cJSON_CreateNumber(n);
number_item->decimal_places = decimal_places;
if (add_item_to_object(object, name, number_item, &global_hooks, false))
{
return number_item;
}
cJSON_Delete(number_item);
return NULL;
}
CJSON_PUBLIC(cJSON*) cJSON_AddStringToObject(cJSON * const object, const char * const name, const char * const string)
{
cJSON *string_item = cJSON_CreateString(string);

3
cJSON.h
View File

@ -117,6 +117,8 @@ typedef struct cJSON
int valueint;
/* The item's number, if type==cJSON_Number */
double valuedouble;
/* Decimal places */
int decimal_places;
/* The item's name string, if this item is the child of, or is in the list of subitems of an object. */
char *string;
@ -266,6 +268,7 @@ CJSON_PUBLIC(cJSON*) cJSON_AddTrueToObject(cJSON * const object, const char * co
CJSON_PUBLIC(cJSON*) cJSON_AddFalseToObject(cJSON * const object, const char * const name);
CJSON_PUBLIC(cJSON*) cJSON_AddBoolToObject(cJSON * const object, const char * const name, const cJSON_bool boolean);
CJSON_PUBLIC(cJSON*) cJSON_AddNumberToObject(cJSON * const object, const char * const name, const double number);
CJSON_PUBLIC(cJSON*) cJSON_AddNumberWithPrecisionToObject(cJSON * const object, const char * const name, const double n, int decimal_places);
CJSON_PUBLIC(cJSON*) cJSON_AddStringToObject(cJSON * const object, const char * const name, const char * const string);
CJSON_PUBLIC(cJSON*) cJSON_AddRawToObject(cJSON * const object, const char * const name, const char * const raw);
CJSON_PUBLIC(cJSON*) cJSON_AddObjectToObject(cJSON * const object, const char * const name);