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lib/libc/tests/string/strcspn_test.c: extend tests to catch previous bug

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This extends the strcspn() unit tests to catch mistakes in the
implementation that only appear when a mismatch occurs in a certain
position of the string against a certain position of the set.

See also:	52d4a4d4e0
Sponsored by:	The FreeBSD Foundation
Approved by:	imp
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D41821
This commit is contained in:
Robert Clausecker 2023-09-11 22:48:58 -04:00
parent 9080190b97
commit 601fd768cf
1 changed files with 64 additions and 0 deletions
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64
lib/libc/tests/string/strcspn_test.c
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@ -148,10 +148,74 @@ ATF_TC_BODY(set_alignments, tc)
test_set_alignments(buf, 30, NOMATCH);
}
#ifndef STRSPN
/* test all positions in which set could match buf */
static void
test_match_positions(char *buf, char *set, size_t buflen, size_t setlen)
{
size_t i, j, outcome;
memset(buf, '-', buflen);
for (i = 0; i < setlen; i++)
set[i] = 'A' + i;
buf[buflen] = '\0';
set[setlen] = '\0';
/*
* Check for (mis)match at buffer position i
* against set position j.
*/
for (i = 0; i < buflen; i++) {
for (j = 0; j < setlen; j++) {
buf[i] = set[j];
outcome = strcspn(buf, set);
ATF_CHECK_EQ_MSG(i, outcome,
"strcspn(\"%s\", \"%s\") = %zu != %zu",
buf, set, outcome, i);
}
buf[i] = '-';
}
}
ATF_TC_WITHOUT_HEAD(match_positions);
ATF_TC_BODY(match_positions, tc)
{
char buf[129], set[65];
test_match_positions(buf, set, 128, 64);
test_match_positions(buf, set, 64, 64);
test_match_positions(buf, set, 32, 64);
test_match_positions(buf, set, 16, 64);
test_match_positions(buf, set, 8, 64);
test_match_positions(buf, set, 128, 32);
test_match_positions(buf, set, 64, 32);
test_match_positions(buf, set, 32, 32);
test_match_positions(buf, set, 16, 32);
test_match_positions(buf, set, 8, 32);
test_match_positions(buf, set, 128, 16);
test_match_positions(buf, set, 64, 16);
test_match_positions(buf, set, 32, 16);
test_match_positions(buf, set, 16, 16);
test_match_positions(buf, set, 8, 16);
test_match_positions(buf, set, 128, 8);
test_match_positions(buf, set, 64, 8);
test_match_positions(buf, set, 32, 8);
test_match_positions(buf, set, 16, 8);
test_match_positions(buf, set, 8, 8);
}
#endif /* !defined(STRSPN) */
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, buf_alignments);
ATF_TP_ADD_TC(tp, set_alignments);
#ifndef STRSPN
ATF_TP_ADD_TC(tp, match_positions);
#endif
return (atf_no_error());
}