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0
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1 /*
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2
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3 @deftypefn Supplemental void* memchr (const void *@var{s}, int @var{c}, size_t @var{n})
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4
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5 This function searches memory starting at @code{*@var{s}} for the
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6 character @var{c}. The search only ends with the first occurrence of
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7 @var{c}, or after @var{length} characters; in particular, a null
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8 character does not terminate the search. If the character @var{c} is
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9 found within @var{length} characters of @code{*@var{s}}, a pointer
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10 to the character is returned. If @var{c} is not found, then @code{NULL} is
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11 returned.
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12
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13 @end deftypefn
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14
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15 */
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16
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17 #include <ansidecl.h>
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18 #include <stddef.h>
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19
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20 PTR
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21 memchr (register const PTR src_void, int c, size_t length)
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22 {
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23 const unsigned char *src = (const unsigned char *)src_void;
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24
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25 while (length-- > 0)
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26 {
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27 if (*src == c)
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28 return (PTR)src;
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29 src++;
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30 }
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31 return NULL;
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32 }
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