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33 lines
811 B
C
33 lines
811 B
C
/*
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@deftypefn Supplemental void* memchr (const void *@var{s}, int @var{c}, size_t @var{n})
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This function searches memory starting at @code{*@var{s}} for the
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character @var{c}. The search only ends with the first occurrence of
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@var{c}, or after @var{length} characters; in particular, a null
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character does not terminate the search. If the character @var{c} is
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found within @var{length} characters of @code{*@var{s}}, a pointer
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to the character is returned. If @var{c} is not found, then @code{NULL} is
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returned.
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@end deftypefn
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*/
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#include <ansidecl.h>
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#include <stddef.h>
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PTR
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memchr (register const PTR src_void, int c, size_t length)
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{
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const unsigned char *src = (const unsigned char *)src_void;
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while (length-- > 0)
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{
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if (*src == c)
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return (PTR)src;
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src++;
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}
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return NULL;
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}
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