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mprintf: reject two kinds of precision for the same argument

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An input like "%.*1$.9999d" would first use the precision taken as an
argument *and* then the precision specified in the string, which is
confusing and wrong. pass1 will now instead return error on this double
use.

Adjusted unit test 1398 to verify

Reported-by: Peter Goodman

Closes #9754
This commit is contained in:
Daniel Stenberg 2022-10-17 17:56:26 +02:00
parent f6b9971d73
commit dae84805de
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4
tests/unit/unit1398.c
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@ -89,4 +89,8 @@ rc = curl_msnprintf(output, 16, "%8d%8d", 1234, 5678);
fail_unless(rc == 15, "return code should be 15");
fail_unless(!strcmp(output, " 1234 567"), "wrong output");
/* double precision */
rc = curl_msnprintf(output, 24, "%.*1$.99d", 3, 5678);
fail_unless(rc == 0, "return code should be 0");
UNITTEST_STOP