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crypto/bio/bio_print.c: improve the precision handling in fmtint 

Per [1]:

    * A negative precision is taken as if the precision were omitted.
    * The default precision is 1.
    * For d, i, o, u, x, and X conversion specifiers, if a precision
      is specified, the '0' flag shall be ignored.

[1] https://pubs.opengroup.org/onlinepubs/9699919799/functions/printf.html

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>

Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28177)
This commit is contained in:
Eugene Syromiatnikov 2025-08-15 16:28:11 +02:00 committed by Neil Horman
parent 2b16781c5b
commit ac49202722
1 changed files with 10 additions and 2 deletions
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12
crypto/bio/bio_print.c
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@ -528,8 +528,16 @@ fmtint(struct pr_desc *desc,
int zpadlen = 0;
int caps = 0;
if (max < 0)
max = 0;
if (max < 0) {
/* A negative precision is taken as if the precision were omitted. */
max = 1;
} else {
/*
* If a precision is given with an integer conversion,
* the 0 flag is ignored.
*/
flags &= ~DP_F_ZERO;
}
uvalue = value;
if (!(flags & DP_F_UNSIGNED)) {
if (value < 0) {