Commit d20d0b10 authored by Thomas Weißschuh's avatar Thomas Weißschuh
Browse files

tools/nolibc: implement strerror() 



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: default avatarShuah Khan <skhan@linuxfoundation.org>
Signed-off-by: default avatarThomas Weißschuh <linux@weissschuh.net>
parent 582facfa

tools/include/nolibc/stdio.h

+10 −0
Original line number Diff line number Diff line
@@ -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"

tools/testing/selftests/nolibc/nolibc-test.c

+4 −0
Original line number Diff line number Diff line
@@ -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 */