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1 /* memcmp -- compare two memory regions.
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2 This function is in the public domain. */
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3
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4 /*
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5
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6 @deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, size_t @var{count})
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7
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8 Compares the first @var{count} bytes of two areas of memory. Returns
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9 zero if they are the same, a value less than zero if @var{x} is
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10 lexically less than @var{y}, or a value greater than zero if @var{x}
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11 is lexically greater than @var{y}. Note that lexical order is determined
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12 as if comparing unsigned char arrays.
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13
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14 @end deftypefn
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15
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16 */
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17
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18 #include <ansidecl.h>
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19 #include <stddef.h>
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20
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21 int
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22 memcmp (const PTR str1, const PTR str2, size_t count)
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23 {
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24 register const unsigned char *s1 = (const unsigned char*)str1;
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25 register const unsigned char *s2 = (const unsigned char*)str2;
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26
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27 while (count-- > 0)
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28 {
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29 if (*s1++ != *s2++)
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30 return s1[-1] < s2[-1] ? -1 : 1;
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31 }
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32 return 0;
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33 }
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34
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