| STRSTR(3) | Linux Programmer's Manual | STRSTR(3) |
strstr - locate a substring
#include <string.h> char *strstr(const char *haystack, const char *needle);
The strstr() function finds the first occurrence of the substring needle in the string haystack. The terminating `\0' characters are not compared.
The strstr() function returns a pointer to the beginning of the substring, or NULL if the substring is not found.
Early versions of Linux libc (like 4.5.26) would not allow an empty argument. Later versions (like 4.6.27) work correctly, and return haystack when needle is empty.
index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strsep(3), strspn(3), strtok(3)
| April 12, 1993 | GNU |