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Subjecttracing: concurrency aware strncpy
Hi Masami,
This might help you out...

/*
* ltt_relay_do_strncpy - copy a string up to a certain number of bytes
* @dest: destination
* @src: source
* @len: max. length to copy
* @terminated: output string ends with \0 (output)
*
* returns the number of bytes copied. Does not finalize with \0 if len is
* reached.
*/
static __inline__
size_t ltt_relay_do_strncpy(void *dest, const void *src, size_t len,
int *terminated)
{
size_t orig_len = len;

*terminated = 0;
/*
* What we really want here is an __inline__ strncpy, but we
* don't have constants, so gcc generally uses a function call.
*/
for (; len > 0; len--) {
*(u8 *)dest = ACCESS_ONCE(*(const u8 *)src);
/* Check with dest, because src may be modified concurrently */
if (*(const u8 *)dest == '\0') {
len--;
*terminated = 1;
break;
}
dest++;
src++;
}
return orig_len - len;
}


--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com


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