| STRSTR(3) | Library Functions Manual | STRSTR(3) | 
strstr, strcasestr,
  strnstr —
#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);
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.
NULL is returned; otherwise
  a pointer to the first character of the first occurrence of
  little is returned.
Bar Baz” portion of
  largestring:
const char *largestring = "Foo Bar Baz"; const char *smallstring = "Bar"; char *ptr; ptr = strstr(largestring, smallstring);
strstr() function conforms to
  ISO/IEC 9899:1990 (“ISO C90”).
strnstr() function originated in
  FreeBSD.
| September 24, 2014 | NetBSD 9.4 |