How do check for part of a name in C

[google24user]

Guys:
I need to write a function in C which will take a string and that string should not have some predefined strings as a prefix of the input.
For eg: I enter a string , it should not have say.."cat", "rat", "ipv4" as prefixes.
I store these values in a array, but then which function do I use..looked thru some stuff - don't think strtok() or strcmp is the right one...

sorry..I'm a beginner at c- been ages since I last coded and forgot abt it
Any help will be greatly appreciated. Thanks in advance.

[horace1]

Guys:
I need to write a function in C which will take a string and that string should not have some predefined strings as a prefix of the input.
For eg: I enter a string , it should not have say.."cat", "rat", "ipv4" as prefixes.
I store these values in a array, but then which function do I use..looked thru some stuff - don't think strtok() or strcmp is the right one...

sorry..I'm a beginner at c- been ages since I last coded and forgot abt it
Any help will be greatly appreciated. Thanks in advance.

you can use the strstr() function
char * strstr ( char * str1, const char * str2 );
it returns a pointer to the first occurrence of str2 in str1 or NULL if not found. If the pointer returned equals str1 the string is prefixed by str2, e.g.

    char test[]="cat called joe";
    char * ch=strstr(test,"cat");
    if(ch==test)  ...   test starts with cat
 

see
http://www.cplusplus.com/strstr

[google24user]

you can use the strstr() function
char * strstr ( char * str1, const char * str2 );
it returns a pointer to the first occurrence of str2 in str1 or NULL if not found. If the pointer returned equals str1 the string is prefixed by str2, e.g.

    char test[]="cat called joe";
    char * ch=strstr(test,"cat");
    if(ch==test)  ...   test starts with cat
 

see
http://www.cplusplus.com/strstr

Thanks !
But here is the catch - the word can be in the string else-where - it should not err out in this scenrio. It should only not be there in the beginning. How do u take care of that? For eg: it's k to have cat in the middle..!

[horace1]

Thanks !
But here is the catch - the word can be in the string else-where - it should not err out in this scenrio. It should only not be there in the beginning. How do u take care of that? For eg: it's k to have cat in the middle..!

 char test[]="cat called joe";
    char * ch=strstr(test,"cat");
    if(ch==test)  ...   error!!  test starts with cat
 

in the above code if ch == test the code starts with cat otherwise it is OK