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Use exp format and more precision output for ZSCAN.

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Ref: issue #2175
This commit is contained in:
antirez
2014-12-02 18:19:30 +01:00
parent 5bd3b9d93f
commit 92c5ab4029
5 changed files with 21 additions and 15 deletions
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28
src/object.c
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@ -109,9 +109,11 @@ robj *createStringObjectFromLongLong(long long value) {
return o;
}
/* Note: this function is defined into object.c since here it is where it
* belongs but it is actually designed to be used just for INCRBYFLOAT */
robj *createStringObjectFromLongDouble(long double value) {
/* Create a string object from a long double. If humanfriendly is non-zero
* it does not use exponential format and trims trailing zeroes at the end,
* however this result in loss of precision. Otherwise exp format is used
* and the output of snprintf() is not modified. */
robj *createStringObjectFromLongDouble(long double value, int humanfriendly) {
char buf[256];
int len;
@ -120,15 +122,19 @@ robj *createStringObjectFromLongDouble(long double value) {
* that is "non surprising" for the user (that is, most small decimal
* numbers will be represented in a way that when converted back into
* a string are exactly the same as what the user typed.) */
len = snprintf(buf,sizeof(buf),"%.17Lf", value);
/* Now remove trailing zeroes after the '.' */
if (strchr(buf,'.') != NULL) {
char *p = buf+len-1;
while(*p == '0') {
p--;
len--;
if (humanfriendly) {
len = snprintf(buf,sizeof(buf),"%.17Lf", value);
/* Now remove trailing zeroes after the '.' */
if (strchr(buf,'.') != NULL) {
char *p = buf+len-1;
while(*p == '0') {
p--;
len--;
}
if (*p == '.') len--;
}
if (*p == '.') len--;
} else {
len = snprintf(buf,sizeof(buf),"%.17Lg", value);
}
return createStringObject(buf,len);
}