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LinuxKPI: string.h implement memcpy_and_pad()

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Add a memcpy variant which takes length of source and destination
buffers and a padding character in case there is free space in the
destination.  This is used by a wireless driver.

MFC after:	3 days
Reviewed by:	emaste
Differential Revision: https://reviews.freebsd.org/D37226
This commit is contained in:
Bjoern A. Zeeb 2022-10-31 22:17:00 +00:00
parent 4a67f1df8b
commit 6a647ae514
1 changed files with 13 additions and 0 deletions
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13
sys/compat/linuxkpi/common/include/linux/string.h
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@ -236,4 +236,17 @@ memset_p(void **p, void *v, size_t n)
return (memset64((uint64_t *)p, (uintptr_t)v, n));
}
static inline void
memcpy_and_pad(void *dst, size_t dstlen, const void *src, size_t len, int ch)
{
if (len >= dstlen) {
memcpy(dst, src, dstlen);
} else {
memcpy(dst, src, len);
/* Pad with given padding character. */
memset((char *)dst + len, ch, dstlen - len);
}
}
#endif /* _LINUXKPI_LINUX_STRING_H_ */