blob: 503ae072244cb2ea9fcbfdffada5815642c875d4 [file] [log] [blame]
Arnaldo Carvalho de Meloc8b5f2c2016-07-06 11:56:20 -03001#undef _GNU_SOURCE
2#include <string.h>
3#include <stdio.h>
4#include <linux/string.h>
5
6/*
7 * The tools so far have been using the strerror_r() GNU variant, that returns
8 * a string, be it the buffer passed or something else.
9 *
10 * But that, besides being tricky in cases where we expect that the function
11 * using strerror_r() returns the error formatted in a provided buffer (we have
12 * to check if it returned something else and copy that instead), breaks the
13 * build on systems not using glibc, like Alpine Linux, where musl libc is
14 * used.
15 *
16 * So, introduce yet another wrapper, str_error_r(), that has the GNU
17 * interface, but uses the portable XSI variant of strerror_r(), so that users
18 * rest asured that the provided buffer is used and it is what is returned.
19 */
20char *str_error_r(int errnum, char *buf, size_t buflen)
21{
22 int err = strerror_r(errnum, buf, buflen);
23 if (err)
24 snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, %p, %zd)=%d", errnum, buf, buflen, err);
25 return buf;
26}