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LinuxKPI: Implement strscpy

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strscpy copies the src string, or as much of it as fits, into the dst
buffer.  The dst buffer is always NUL terminated, unless it's zero-sized.
strscpy returns the number of characters copied (not including the
trailing NUL) or -E2BIG if len is 0 or src was truncated.

Currently drm-kmod replaces strscpy with strncpy that is not quite
correct as strncpy does not NUL-terminate truncated strings and returns
different values on exit.

Reviewed by:	hselasky, imp, manu
Differential revision:	https://reviews.freebsd.org/D31005

(cherry picked from commit 019391bf85)
This commit is contained in:
Vladimir Kondratyev 2021-07-05 03:20:42 +03:00
parent 80b8638e12
commit 22310af02d
1 changed files with 16 additions and 0 deletions
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16
sys/compat/linuxkpi/common/include/linux/string.h
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@ -167,4 +167,20 @@ str_has_prefix(const char *str, const char *prefix)
return (strncmp(str, prefix, len) == 0 ? len : 0);
}
static inline ssize_t
strscpy(char* dst, const char* src, size_t len)
{
size_t i;
if (len <= INT_MAX) {
for (i = 0; i < len; i++)
if ('\0' == (dst[i] = src[i]))
return ((ssize_t)i);
if (i != 0)
dst[--i] = '\0';
}
return (-E2BIG);
}
#endif /* _LINUX_STRING_H_ */