STRSTR(3) Library Functions Manual STRSTR(3)
NAME
strstr, strcasestrlocate a substring in a string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <string.h>
char *
strstr(const char *big, const char *little);
char *
strcasestr(const char *big, const char *little);
DESCRIPTION
The strstr() function locates the first occurrence of the nul-terminated string little in the nul-terminated string big.
 
The strcasestr() function is similar to strstr(), but ignores the case of both strings.
RETURN VALUES
If little is an empty string, big is returned; if little occurs nowhere in big, NULL is returned; otherwise a pointer to the first character of the first occurrence of little is returned.
EXAMPLES
The following sets the pointer ptr to the “Bar Baz” portion of largestring:
const char *largestring = "Foo Bar Baz"; const char *smallstring = "Bar"; char *ptr; ptr = strstr(largestring, smallstring);
SEE ALSO
STANDARDS
The strstr() function conforms to ISO/IEC 9899:1990 (“ISO C90”).