| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | #undef _GNU_SOURCE |
| 3 | #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 returns |
| 9 | * a string, be it the buffer passed or something else. |
| 10 | * |
| 11 | * But that, besides being tricky in cases where we expect that the function |
| 12 | * using strerror_r() returns the error formatted in a provided buffer (we have |
| 13 | * to check if it returned something else and copy that instead), breaks the |
| 14 | * build on systems not using glibc, like Alpine Linux, where musl libc is |
| 15 | * used. |
| 16 | * |
| 17 | * So, introduce yet another wrapper, str_error_r(), that has the GNU |
| 18 | * interface, but uses the portable XSI variant of strerror_r(), so that users |
| 19 | * rest asured that the provided buffer is used and it is what is returned. |
| 20 | */ |
| 21 | char *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 |