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af359dea | 1 | .\" Copyright (c) 1990, 1991 The Regents of the University of California. |
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2 | .\" All rights reserved. |
3 | .\" | |
4 | .\" This code is derived from software contributed to Berkeley by | |
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5 | .\" Chris Torek and the American National Standards Committee X3, |
6 | .\" on Information Processing Systems. | |
90f51bbb | 7 | .\" |
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8 | .\" Redistribution and use in source and binary forms, with or without |
9 | .\" modification, are permitted provided that the following conditions | |
10 | .\" are met: | |
11 | .\" 1. Redistributions of source code must retain the above copyright | |
12 | .\" notice, this list of conditions and the following disclaimer. | |
13 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
14 | .\" notice, this list of conditions and the following disclaimer in the | |
15 | .\" documentation and/or other materials provided with the distribution. | |
16 | .\" 3. All advertising materials mentioning features or use of this software | |
17 | .\" must display the following acknowledgement: | |
18 | .\" This product includes software developed by the University of | |
19 | .\" California, Berkeley and its contributors. | |
20 | .\" 4. Neither the name of the University nor the names of its contributors | |
21 | .\" may be used to endorse or promote products derived from this software | |
22 | .\" without specific prior written permission. | |
23 | .\" | |
24 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | .\" SUCH DAMAGE. | |
90f51bbb | 35 | .\" |
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36 | .\" @(#)memcmp.3 5.5 (Berkeley) 6/29/91 |
37 | .\" | |
38 | .Dd June 29, 1991 | |
39 | .Dt MEMCMP 3 | |
40 | .Os | |
41 | .Sh NAME | |
42 | .Nm memcmp | |
43 | .Nd compare byte string | |
44 | .Sh SYNOPSIS | |
45 | .Fd #include <string.h> | |
46 | .Ft int | |
47 | .Fn memcmp "const void *b1" "const void *b2" "size_t len" | |
48 | .Sh DESCRIPTION | |
49 | The | |
50 | .Fn memcmp | |
51 | function | |
90f51bbb | 52 | compares byte string |
af359dea | 53 | .Fa b1 |
90f51bbb | 54 | against byte string |
af359dea | 55 | .Fa b2 . |
90f51bbb | 56 | Both strings are assumed to be |
af359dea | 57 | .Fa len |
90f51bbb | 58 | bytes long. |
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59 | .Sh RETURN VALUES |
60 | The | |
61 | .Fn memcmp | |
62 | function | |
63 | returns zero if the the two strings are identical, | |
64 | otherwise returns the difference between the first two differing bytes | |
65 | (treated as unsigned char values, so that | |
66 | .Sq Li \e200 | |
67 | is greater than | |
68 | .Sq Li \&\e0 , | |
69 | for example). | |
90f51bbb | 70 | Zero-length strings are always identical. |
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71 | .Sh SEE ALSO |
72 | .Xr bcmp 3 , | |
73 | .Xr strcasecmp 3 , | |
74 | .Xr strcmp 3 , | |
75 | .Xr strcoll 3 , | |
76 | .Xr strxfrm 3 | |
77 | .Sh STANDARDS | |
78 | The | |
79 | .Fn memcmp | |
80 | function | |
81 | conforms to | |
82 | .St -ansiC . |