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make strerror_r behave nicer on failure

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if the buffer is too short, at least return a partial string. this is
helpful if the caller is lazy and does not check for failure. care is
taken to avoid writing anything if the buffer length is zero, and to
always null-terminate when the buffer length is non-zero.
This commit is contained in:
Rich Felker
2012-06-20 12:07:18 -04:00
parent 839bff64a1
commit f313a16224
1 changed files with 8 additions and 2 deletions
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10
src/string/strerror_r.c
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@ -4,8 +4,14 @@
int strerror_r(int err, char *buf, size_t buflen)
{
char *msg = strerror(err);
if (strlen(msg) >= buflen)
size_t l = strlen(msg);
if (l >= buflen) {
if (buflen) {
memcpy(buf, msg, buflen-1);
buf[buflen-1] = 0;
}
return ERANGE;
strcpy(buf, msg);
}
memcpy(buf, msg, l+1);
return 0;
}