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/* strncmp -- compare two strings, stop after n bytes.
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This function is in the public domain. */
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@deftypefn Supplemental int strncmp (const char *@var{s1}, const char *@var{s2}, size_t @var{n})
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Compares the first @var{n} bytes of two strings, returning a value as
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#define size_t unsigned long
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register unsigned char u1, u2;
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u1 = (unsigned char) *s1++;
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u2 = (unsigned char) *s2++;