projects / unix-history / blame
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1 | .\" Copyright (c) 1990 The Regents of the University of California. |
| 2 | .\" All rights reserved. | |
| 3 | .\" | |
| 4 | .\" This code is derived from software contributed to Berkeley by | |
| 5 | .\" Chris Torek. | |
| 6 | .\" | |
| 7 | .\" %sccs.include.redist.man% | |
| 8 | .\" | |
| b8dfab23 | 9 | .\" @(#)memcmp.3 5.2 (Berkeley) %G% |
| 90f51bbb KB |
10 | .\" |
| 11 | .TH MEMCMP 3 "" | |
| 12 | .UC 7 | |
| 13 | .SH NAME | |
| 14 | memcmp \- compare byte string | |
| 15 | .SH SYNOPSIS | |
| 16 | .nf | |
| 17 | .ft B | |
| 18 | #include <string.h> | |
| 19 | ||
| 20 | int | |
| 21 | memcmp(const void *b1, const void *b2, size_t len); | |
| 22 | .ft R | |
| 23 | .fi | |
| 24 | .SH DESCRIPTION | |
| 25 | .B Memcmp | |
| 26 | compares byte string | |
| 27 | .I b1 | |
| 28 | against byte string | |
| 29 | .IR b2 , | |
| 30 | returning zero if they are identical, | |
| 31 | otherwise returning the difference between the first two differing bytes | |
| 32 | (treated as unsigned char values, so that '\e200' is greater than \&'\e0', | |
| 33 | e.g.). | |
| 34 | Both strings are assumed to be | |
| 35 | .I len | |
| 36 | bytes long. | |
| 37 | Zero-length strings are always identical. | |
| 38 | .SH SEE ALSO | |
| b8dfab23 | 39 | bcmp(3), strcasecmp(3), strcmp(3), strcoll(3), strxfrm(3) |
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40 | .SH STANDARDS |
| 41 | .I Memcmp | |
| 42 | conforms to ANSI X3.159-1989 (``ANSI C''). |