27 lines
1000 B
C
27 lines
1000 B
C
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#undef _GNU_SOURCE
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#include <string.h>
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#include <stdio.h>
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#include <linux/string.h>
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/*
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* The tools so far have been using the strerror_r() GNU variant, that returns
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* a string, be it the buffer passed or something else.
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*
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* But that, besides being tricky in cases where we expect that the function
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* using strerror_r() returns the error formatted in a provided buffer (we have
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* to check if it returned something else and copy that instead), breaks the
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* build on systems not using glibc, like Alpine Linux, where musl libc is
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* used.
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*
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* So, introduce yet another wrapper, str_error_r(), that has the GNU
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* interface, but uses the portable XSI variant of strerror_r(), so that users
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* rest asured that the provided buffer is used and it is what is returned.
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*/
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char *str_error_r(int errnum, char *buf, size_t buflen)
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{
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int err = strerror_r(errnum, buf, buflen);
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if (err)
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snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, %p, %zd)=%d", errnum, buf, buflen, err);
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return buf;
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}
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