How to handle invalid passed arguments in Ansi C -

i new c , come ground of newer languages (like java , c++) , i'm not sure how handle runtime errors incorrect arguments sent function.

for example want write function manipulate string (assuming valid int acceptable return value):

int foo (char s[]) {     if ( strlen(s) < 1)         // error     ....     ....     return someint; }

how handle scenario in ansi c if want function stop immediately? in c++ or java throw exception caught caller.

you can use return value :

if( /* bad parameters */ )    return -1;

and :

int value = foo( ); if( value == -1 )    // error else    // no error

or pass parameters :

int foo( char s[], int* value ) {     if( /* error */ )         return 1;// error code 1     // ...     *value = something;     return 0; }

then when call function can verify if executed correctly :

 if( foo( "something", &result ) )  {      //ok  }  else  {      // not ok  }

both of these method implies caller verify manually if there error

YU