gistfile1.c

int error(void);                                                                 
int baz(char **, const char *);                                                  
int quux(char *);                                                                
                                                                                 
static int bar(char **out, const char *in)                                       
{                                                                                
        char *t;                                                                 
        int err;                                                                 
                                                                                 
        err = baz(&t, in);                                                       
        if (err < 0)                                                             
                return error();                                                  
                                                                                 
        *out = t;                                                                
                                                                                 
        return 0;                                                                
}                                                                                
                                                                                 
int foo(const char *a)                                                           
{                                                                                
        int err;                                                                 
        char *b;                                                                 
                                                                                 
        err = bar(&b, a);                                                        
        if (err < 0)                                                             
                return error();                                                  
                                                                                 
        return quux(b);                                                          
}