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tools/nolibc: implement strerror()

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strerror() is commonly used.
For example in kselftest which currently needs to do an #ifdef NOLIBC to
handle the lack of strerror().

Keep it simple and reuse the output format of perror() for strerror().

Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Thomas Weißschuh 2024-04-26 13:08:57 +02:00
parent 582facfa5a
commit d20d0b10f8
2 changed files with 14 additions and 0 deletions
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10
tools/include/nolibc/stdio.h
View File

@ -376,6 +376,16 @@ int setvbuf(FILE *stream __attribute__((unused)),
return 0;
}
static __attribute__((unused))
const char *strerror(int errno)
{
static char buf[18] = "errno=";
i64toa_r(errno, &buf[6]);
return buf;
}
/* make sure to include all global symbols */
#include "nolibc.h"

4
tools/testing/selftests/nolibc/nolibc-test.c
View File

@ -1210,6 +1210,10 @@ int run_stdlib(int min, int max)
CASE_TEST(strtol_underflow); EXPECT_STRTOX(1, strtol, "-0x8000000000000001", 16, LONG_MIN, -1, ERANGE); break;
CASE_TEST(strtoul_negative); EXPECT_STRTOX(1, strtoul, "-0x1", 16, ULONG_MAX, 4, 0); break;
CASE_TEST(strtoul_overflow); EXPECT_STRTOX(1, strtoul, "0x10000000000000000", 16, ULONG_MAX, -1, ERANGE); break;
CASE_TEST(strerror_success); EXPECT_STREQ(is_nolibc, strerror(0), "errno=0"); break;
CASE_TEST(strerror_EINVAL); EXPECT_STREQ(is_nolibc, strerror(EINVAL), "errno=22"); break;
CASE_TEST(strerror_int_max); EXPECT_STREQ(is_nolibc, strerror(INT_MAX), "errno=2147483647"); break;
CASE_TEST(strerror_int_min); EXPECT_STREQ(is_nolibc, strerror(INT_MIN), "errno=-2147483648"); break;
case __LINE__:
return ret; /* must be last */