strcasecmp() — Case-insensitive string comparison

Standards

Standards / Extensions	C or C++	Dependencies
XPG4.2 Single UNIX Specification, Version 3	both

#define  _XOPEN_SOURCE_EXTENDED 1
#include <strings.h>

int strcasecmp(const char *string1, const char *string2);

The strcasecmp() function compares, while ignoring differences in case, the string pointed to by string1 to the string pointed to by string2.

The string arguments to the function must contain a NULL character (\0) marking the end of the string.

The strcasecmp() function is locale-sensitive.

strcasecmp() returns a value indicating the relationship between the strings, while ignoring case, as follows:

Value: Meaning
< 0: String pointed to by string1 is less than string pointed to by string2.
= 0: String pointed to by string1 is equal to string pointed to by string2.
> 0: String pointed to by string1 is greater than string pointed to by string2.

There are no errno values defined.