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#include <string.h>
size_t strlcat(char *restrict dst, const char *restrict src, size_t dstsize)
{
size_t dlen = strlen(dst);
size_t slen = strlen(src);
size_t n = dstsize - dlen - 1;
if (n == 0)
return dlen + slen;
if (n > slen)
n = slen;
memcpy(dst + dlen, src, n);
dst[dlen + n] = '\0';
return dlen + n;
}
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