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STRSTR(3) Library Functions Manual STRSTR(3) NAME strstr, strcasestr, strnstr - locate 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); char * strnstr(const char *big, const char *little, size_t len); 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. The strnstr() function locates the first occurrence of the NUL-terminated string little in the string big, where not more than len characters are searched. Characters that appear after a `\0' character are not searched. Since the strnstr() function is a NetBSD specific API, it should only be used when portability is not a concern. 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 index(3), memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strtok(3) STANDARDS The strstr() function conforms to ISO/IEC 9899:1990 ("ISO C90"). HISTORY The strnstr() function originated in FreeBSD. NetBSD 8.0 September 24, 2014 NetBSD 8.0