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tools/nolibc: add strstr()

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This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-1-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Thomas Weißschuh 2025-04-28 14:40:02 +02:00 • committed by Thomas Weißschuh
parent 1f421ddf49
commit 05b6b2a9ef
2 changed files with 23 additions and 0 deletions
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20
tools/include/nolibc/string.h
View file

@ -292,6 +292,26 @@ char *strrchr(const char *s, int c)
return (char *)ret;
}
static __attribute__((unused))
char *strstr(const char *haystack, const char *needle)
{
size_t len_haystack, len_needle;
len_needle = strlen(needle);
if (!len_needle)
return NULL;
len_haystack = strlen(haystack);
while (len_haystack >= len_needle) {
if (!memcmp(haystack, needle, len_needle))
return (char *)haystack;
haystack++;
len_haystack--;
}
return NULL;
}
static __attribute__((unused))
int tolower(int c)
{

3
tools/testing/selftests/nolibc/nolibc-test.c
View file

@ -1211,6 +1211,9 @@ int run_stdlib(int min, int max)
CASE_TEST(strlcpy_2); EXPECT_STRBUFEQ(is_nolibc, strlcpy(buf, "bar", 2), buf, 3, "b"); break;
CASE_TEST(strlcpy_3); EXPECT_STRBUFEQ(is_nolibc, strlcpy(buf, "bar", 3), buf, 3, "ba"); break;
CASE_TEST(strlcpy_4); EXPECT_STRBUFEQ(is_nolibc, strlcpy(buf, "bar", 4), buf, 3, "bar"); break;
CASE_TEST(strstr_foobar_foo); EXPECT_STREQ(1, strstr("foobar", "foo"), "foobar"); break;
CASE_TEST(strstr_foobar_bar); EXPECT_STREQ(1, strstr("foobar", "bar"), "bar"); break;
CASE_TEST(strstr_foobar_baz); EXPECT_PTREQ(1, strstr("foobar", "baz"), NULL); break;
CASE_TEST(memcmp_20_20); EXPECT_EQ(1, memcmp("aaa\x20", "aaa\x20", 4), 0); break;
CASE_TEST(memcmp_20_60); EXPECT_LT(1, memcmp("aaa\x20", "aaa\x60", 4), 0); break;
CASE_TEST(memcmp_60_20); EXPECT_GT(1, memcmp("aaa\x60", "aaa\x20", 4), 0); break;