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STRCMP(3) Library Functions Manual STRCMP(3)

strcmp, strncmpcompare strings

#include <string.h>

int
strcmp(const char *s1, const char *s2);

int
strncmp(const char *s1, const char *s2, size_t len);

The () and () functions lexicographically compare the NUL-terminated strings s1 and s2. The strncmp() function compares at most len characters.

The strcmp() and strncmp() functions return an integer greater than, equal to, or less than 0, according to whether the string s1 is greater than, equal to, or less than the string s2. The comparison is done using unsigned characters, so that ‘\200’ is greater than ‘\0’.

bcmp(3), memcmp(3), strcasecmp(3), strcoll(3), strxfrm(3), wcscmp(3)

The strcmp() and strncmp() functions conform to ANSI X3.159-1989 (“ANSI C89”).

The strcmp() function first appeared outside of Bell Labs in PWB/UNIX 1.0. strncmp() first appeared in Version 7 AT&T UNIX.

August 1, 2022 OpenBSD-current