28 lines · c
1// SPDX-License-Identifier: GPL-2.02#undef _GNU_SOURCE3#include <string.h>4#include <stdio.h>5#include <linux/string.h>6 7/*8 * The tools so far have been using the strerror_r() GNU variant, that returns9 * a string, be it the buffer passed or something else.10 *11 * But that, besides being tricky in cases where we expect that the function12 * using strerror_r() returns the error formatted in a provided buffer (we have13 * to check if it returned something else and copy that instead), breaks the14 * build on systems not using glibc, like Alpine Linux, where musl libc is15 * used.16 *17 * So, introduce yet another wrapper, str_error_r(), that has the GNU18 * interface, but uses the portable XSI variant of strerror_r(), so that users19 * rest asured that the provided buffer is used and it is what is returned.20 */21char *str_error_r(int errnum, char *buf, size_t buflen)22{23 int err = strerror_r(errnum, buf, buflen);24 if (err)25 snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, [buf], %zd)=%d", errnum, buflen, err);26 return buf;27}28