strnstr (3) - Linux Man Pages
strnstr: locate a substring in a string
strnstr - locate a substring in a string
SYNOPSISIn bsd/string.h Ft char * Fn strnstr const char *big const char *little size_t len
DESCRIPTIONThe Fn strnstr function locates the first occurrence of the null-terminated string Fa little in the string Fa big , where not more than Fa len characters are searched. Characters that appear after a `\0' character are not searched. Since the Fn strnstr function is a Fx specific API, it should only be used when portability is not a concern.
RETURN VALUESIf Fa little is an empty string, Fa big is returned; if Fa little occurs nowhere in Fa big , NULL is returned; otherwise a pointer to the first character of the first occurrence of Fa little is returned.
EXAMPLESThe following sets the pointer ptr to NULL because only the first 4 characters of largestring are searched:
const char *largestring = "Foo Bar Baz"; const char *smallstring = "Bar"; char *ptr; ptr = strnstr(largestring, smallstring, 4);