1// SPDX-License-Identifier: LGPL-2.1
 2#undef _GNU_SOURCE
 3#include <string.h>
 4#include <stdio.h>
 5
 6#include "event-parse.h"
 7
 8#undef _PE
 9#define _PE(code, str) str
10static const char * const tep_error_str[] = {
11	TEP_ERRORS
12};
13#undef _PE
14
15/*
16 * The tools so far have been using the strerror_r() GNU variant, that returns
17 * a string, be it the buffer passed or something else.
18 *
19 * But that, besides being tricky in cases where we expect that the function
20 * using strerror_r() returns the error formatted in a provided buffer (we have
21 * to check if it returned something else and copy that instead), breaks the
22 * build on systems not using glibc, like Alpine Linux, where musl libc is
23 * used.
24 *
25 * So, introduce yet another wrapper, str_error_r(), that has the GNU
26 * interface, but uses the portable XSI variant of strerror_r(), so that users
27 * rest asured that the provided buffer is used and it is what is returned.
28 */
29int tep_strerror(struct tep_handle *tep __maybe_unused,
30		 enum tep_errno errnum, char *buf, size_t buflen)
31{
32	const char *msg;
33	int idx;
34
35	if (!buflen)
36		return 0;
37
38	if (errnum >= 0) {
39		int err = strerror_r(errnum, buf, buflen);
40		buf[buflen - 1] = 0;
41		return err;
42	}
43
44	if (errnum <= __TEP_ERRNO__START ||
45	    errnum >= __TEP_ERRNO__END)
46		return -1;
47
48	idx = errnum - __TEP_ERRNO__START - 1;
49	msg = tep_error_str[idx];
50	snprintf(buf, buflen, "%s", msg);
51
52	return 0;
53}