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tools/nolibc: add missing memchr() to string.h

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Surprisingly we forgot to add this common one. It was added with a
per-arch guard allowing to later implement it in arch-specific asm
code like was done for a few other ones.

The test verifies that we don't search past the indicated length.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Willy Tarreau 2025-11-02 11:46:10 +01:00 • committed by Thomas Weißschuh
parent 09c873c91f
commit db75042e93
2 changed files with 17 additions and 0 deletions
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15
tools/include/nolibc/string.h
View file

@ -93,6 +93,21 @@ void *memset(void *dst, int b, size_t len)
}
#endif /* #ifndef NOLIBC_ARCH_HAS_MEMSET */
#ifndef NOLIBC_ARCH_HAS_MEMCHR
static __attribute__((unused))
void *memchr(const void *s, int c, size_t len)
{
char *p = (char *)s;
while (len--) {
if (*p == (char)c)
return p;
p++;
}
return NULL;
}
#endif /* #ifndef NOLIBC_ARCH_HAS_MEMCHR */
static __attribute__((unused))
char *strchr(const char *s, int c)
{

2
tools/testing/selftests/nolibc/nolibc-test.c
View file

@ -1549,6 +1549,8 @@ int run_stdlib(int min, int max)
CASE_TEST(abs); EXPECT_EQ(1, abs(-10), 10); break;
CASE_TEST(abs_noop); EXPECT_EQ(1, abs(10), 10); break;
CASE_TEST(difftime); EXPECT_ZR(1, test_difftime()); break;
CASE_TEST(memchr_foobar6_o); EXPECT_STREQ(1, memchr("foobar", 'o', 6), "oobar"); break;
CASE_TEST(memchr_foobar3_b); EXPECT_STRZR(1, memchr("foobar", 'b', 3)); break;
case __LINE__:
return ret; /* must be last */