memcmp(9f) - osol9

1memchr(9F)               Kernel Functions for Drivers               memchr(9F)
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NAME

6       memchr, memcmp, memcpy, memmove, memset - Memory operations
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SYNOPSIS

9       #include <sys/ddi.h>
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13       void *memchr(const void *s, int c, size_t n);
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16       int memcmp(const void *s1, const void *s2, size_t n);
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19       void *memcpy(void *restrict s1, const void *restrict s2, size_t n);
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22       void *memmove(void *s1, const void *s2, size_t n);
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25       void *memset(void *s, int c, size_t n);
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INTERFACE LEVEL

29       Solaris DDI specific (Solaris DDI).
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PARAMETERS

32       dst       Pointers to character strings.
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35       n         Count of characters to be copied.
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38       s1, s2    Pointers to character strings.
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DESCRIPTION

42       These  functions  operate  as  efficiently  as possible on memory areas
43       (arrays of bytes bounded by a count, not terminated by a  null  charac‐
44       ter). They do not check for the overflow of any receiving memory area.
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47       The  memchr()  function  returns a pointer to the first occurrence of c
48       (converted to an unsigned char) in the first n bytes (each  interpreted
49       as  an unsigned char) of memory area s, or a null pointer if c does not
50       occur.
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53       The memcmp() function compares its arguments, looking at  the  first  n
54       bytes  (each  interpreted  as an unsigned char), and returns an integer
55       less than, equal to, or greater than 0, according as s1 is lexicograph‐
56       ically  less  than,  equal  to,  or  greater  than  s2 when taken to be
57       unsigned characters.
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60       The memcpy() function copies n bytes from memory  area  s2  to  s1.  It
61       returns  s1.  If  copying takes place between objects that overlap, the
62       behavior is undefined.
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65       The memmove() function copies n bytes from memory  area  s2  to  memory
66       area  s1.  Copying  between  objects  that overlap will take place cor‐
67       rectly. It returns s1.
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70       The memset() function sets the first n bytes in memory area  s  to  the
71       value of c (converted to an unsigned char). It returns s.
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USAGE

74       Using  memcpy() might be faster than using memmove() if the application
75       knows that the objects being copied do not overlap.
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CONTEXT

78       These functions can be called from user, interrupt, or kernel context.
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