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int parse_answer(char **buffer_start, char *buffer_end, char **curr_ptr, size_t *curr_size)
{
    if(*buffer_start >= buffer_end){        
        return 0;
    }
    *curr_ptr = *buffer_start;
    while(**buffer_start != ','){
        (*buffer_start)++;
    }
    (*buffer_start)++;
 
    *curr_size=*buffer_start-*curr_ptr-1;
 
    return 1;
}
 
 
 
void test(){
    int answer_size;
    char answer_buffer[ANSWER_BUFFER_SIZE]; 
    char *buffer_start;
    char *buffer_end;
    char *curr_ptr;
    size_t curr_size;
 
    ...
    //reading answer_here
    ...
 
    buffer_start = answer_buffer;
    buffer_end = &answer_buffer[answer_size];
 
    i=0;
    while(parse_answer(&buffer_start,buffer_end,&curr_ptr,&curr_size)) {
        printf("%2d:%.*s\n",i,curr_size,curr_ptr);
        i++;
    }
 
}

prog.c:1: error: expected declaration specifiers or ‘...’ before ‘size_t’
prog.c: In function ‘parse_answer’:
prog.c:12: error: ‘curr_size’ undeclared (first use in this function)
prog.c:12: error: (Each undeclared identifier is reported only once
prog.c:12: error: for each function it appears in.)
prog.c: In function ‘test’:
prog.c:21: error: ‘ANSWER_BUFFER_SIZE’ undeclared (first use in this function)
prog.c:25: error: ‘size_t’ undeclared (first use in this function)
prog.c:25: error: expected ‘;’ before ‘curr_size’
prog.c:27: error: expected expression before ‘...’ token
prog.c:34: error: ‘i’ undeclared (first use in this function)
prog.c:35: error: ‘curr_size’ undeclared (first use in this function)
prog.c:35: error: too many arguments to function ‘parse_answer’
prog.c:36: warning: implicit declaration of function ‘printf’
prog.c:36: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:21: warning: unused variable ‘answer_buffer’

Standard output is empty