// find first occurence of pattern in line OR NULLPTR if none
int Regexpr::find_first(char *start)
{
int err;
start_ptr = end_ptr = line;
if ((err = search()) != 0)
last_occurence(start);
return err;
}
// find next occurence but begin search at end of the previous occurence
int Regexpr::find_next_skipcurrent(char *start)
{
int err;
if (*end_ptr == eol)
return 0;
end_ptr = start_ptr = end_ptr+1; // end of previous occurence
if ((err = search()) != 0)
last_occurence(start);
return err;
}
// find next occurence OR NULLPTR
int Regexpr::find_next(char *start)
{
int err;
if (*start_ptr == eol)
return 0;
end_ptr = ++start_ptr; // position start/end_ptr to next character
if ((err = search()) != 0)
last_occurence(start);
return err;
}
int main(int argc, char *argv[])
{
// int bytes_read;
size_t nbytes = 100;
char *my_string, c;
puts ("Please enter a line of text.");
my_string = (char *) malloc (nbytes + 1);
getline (&my_string, &nbytes, stdin);
puts ("Please enter a character");
scanf("%c", &c);
printf("%d\n", last_occurence(c, my_string));
free(my_string);
return 0;
}
// main function for searching the pattern
// handles the '|' meta symbol
// returns 0 or 1 and sets pointers
int Regexpr::search(char **start,char **end)
{
char *cur_startptr;
patptr = pattern; // init. patptr
ignore_case = 0;
lineptr = start_ptr;
if (_search(&cur_startptr) <= 0)
return 0;
start_ptr = cur_startptr;
end_ptr = lineptr-1; // points on last character matching pattern
if (start && end)
last_occurence(start,end); // set up start and end
return 1;
}
