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[ruby/bigdecimal] Fix the maximum length of float number

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This change is for preventing the false-positive alert by CoverityScan.
See CID-1471770 for the detail.

https://github.com/ruby/bigdecimal/commit/4d5b97125b
This commit is contained in:
Kenta Murata 2021-01-29 18:06:13 +09:00
parent b4eba8dfee
commit 8df1881c8f
1 changed files with 5 additions and 3 deletions
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8
ext/bigdecimal/bigdecimal.c
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@ -2856,14 +2856,16 @@ rb_float_convert_to_BigDecimal(VALUE val, size_t digs, int raise_exception)
}
/* Use the same logic in flo_to_s to convert a float to a decimal string */
char buf[DBLE_FIG + BASE_FIG + 2 + 1];
char buf[DBLE_FIG + BASE_FIG + 2 + 1]; /* sizeof(buf) == 28 in the typical case */
int decpt, negative_p;
char *e;
const int mode = digs == 0 ? 0 : 2;
char *p = BigDecimal_dtoa(d, mode, (int)digs, &decpt, &negative_p, &e);
int len10 = (int)(e - p);
if (len10 >= (int)sizeof(buf))
len10 = (int)sizeof(buf) - 1;
if (len10 > DBLE_FIG) {
/* TODO: Presumably, rounding should be done here. */
len10 = DBLE_FIG;
}
memcpy(buf, p, len10);
xfree(p);