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lib/libc/tests/string/strcspn_test.c: add test for correct match order

Browse source 
This new unit test verifies that if there are multiple
matches, the first match is returned, ignoring later
matches.

Approved by:	mjg (blanket, via IRC)
MFC after:	1 week
MFC to:		stable/14
This commit is contained in:
Robert Clausecker 2023-12-19 11:27:24 -05:00
parent 7c8f163184
commit a0ecf2224e
1 changed files with 50 additions and 1 deletions
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51
lib/libc/tests/string/strcspn_test.c
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@ -150,7 +150,7 @@ ATF_TC_BODY(set_alignments, tc)
#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)
test_match_positions(char *buf, char *set, size_t buflen, size_t setlen)
{
size_t i, j, outcome;
@ -206,6 +206,54 @@ ATF_TC_BODY(match_positions, tc)
test_match_positions(buf, set, 16, 8);
test_match_positions(buf, set, 8, 8);
}
/* if there are two matches, check that the earlier match is taken */
static void
test_match_order(char *buf, char *set, size_t buflen, size_t setlen)
{
size_t i, j, k, l, outcome;
memset(buf, '-', buflen);
for (i = 0; i < setlen; i++)
set[i] = 'A' + i;
buf[buflen] = '\0';
set[setlen] = '\0';
for (i = 0; i < setlen; i++)
for (j = 0; j < setlen; j++)
for (k = 0; k + 1 < buflen; k++)
for (l = k + 1; l < buflen; l++) {
buf[k] = set[i];
buf[l] = set[j];
outcome = strcspn(buf, set);
ATF_CHECK_EQ_MSG(k, outcome,
"strcspn(\"%s\", \"%s\") = %zu != %zu",
buf, set, outcome, k);
buf[k] = '-';
buf[l] = '-';
}
}
ATF_TC_WITHOUT_HEAD(match_order);
ATF_TC_BODY(match_order, tc)
{
char buf[33], set[65];
test_match_order(buf, set, 32, 64);
test_match_order(buf, set, 16, 64);
test_match_order(buf, set, 8, 64);
test_match_order(buf, set, 32, 32);
test_match_order(buf, set, 16, 32);
test_match_order(buf, set, 8, 32);
test_match_order(buf, set, 32, 16);
test_match_order(buf, set, 16, 16);
test_match_order(buf, set, 8, 16);
test_match_order(buf, set, 32, 8);
test_match_order(buf, set, 16, 8);
test_match_order(buf, set, 8, 8);
}
#endif /* !defined(STRSPN) */
ATF_TP_ADD_TCS(tp)
@ -214,6 +262,7 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC(tp, set_alignments);
#ifndef STRSPN
ATF_TP_ADD_TC(tp, match_positions);
ATF_TP_ADD_TC(tp, match_order);
#endif
return (atf_no_error());