/* main.c - main program for match */
#include <stdio.h>

#include "own.h"

static char string[STRINGSIZE]; /* our search string */
int ignore_case;	/* don't care about letter cases (up/low) */
int line_beginning;	/* must match to the beginning of a line */
int line_end;		/* must match to the end of a line */		/**/
static int count_lines; /* only count lines that match the string */

/* get next line from input (K&R pp 29) */
static int getline(char s[], int lim)
{
	int c,i;
	for (i=0;i<lim-1 && (c=getchar()) != EOF && c != '\n';++i)
		s[i] = c;
	if (c == '\n') {
		s[i] = c;
		++i;
	}
	s[i] = '\0';
	return i;
}

/* copy string from to string to; to has room for maxsize characters 
   (string terminator '\0' included) */
static int copy(char to[], const char from[], int maxsize)
{
	int i;
	
	for (i=0;i<maxsize-1;i++)
		if ((to[i] = from[i]) == '\0')
			break;
	to[i] = '\0';
	return i;
}

/* find and process command line parameters */		
static int process_parameters(int argc, char *argv[])
{
	int i;
	int string_found = 0;

	for (i=1;i<argc;i++)
	{
		/* process command switches. Note side effects! */
		if (argv[i][0] == '-') {
			switch (argv[i][1]) {
				case 'c':
					count_lines = TRUE;
					break;
				case 'i':
					ignore_case = TRUE;
					break;
				case 'b':				/**/
					line_beginning = TRUE;		/**/
					break;				/**/
				case 'e':	/* LT */
					line_end = TRUE;
					break;
				default:
					printf("Unknown option %s - ignored\n",
						argv[i]);
					break;
			}
		}
		else
		{
			if (!string_found) {
				copy(string,argv[i],STRINGSIZE);
				string_found = 1;
			}
			else {
				printf("Only one search string can be given!\n");
				return FALSE;
			}
		}
	}
	if (!string_found) {
		printf("The search string must be given!\n");
		return FALSE;
	}
	return TRUE;
}
				
int main(int argc, char *argv[])
{
	int len;
	char buffer[BUFSIZE];
	int count = 0;

	if (!process_parameters(argc,argv)) {
		printf("Error in command line parameters, exiting\n");
		return -1; /* error! */
	}
	while ((len = getline(buffer,BUFSIZE)) > 0) {
		if (buffer[len-1] == '\n')
			buffer[--len] = '\0';
		if (match(buffer,string)) {
			if (count_lines)
				count++;
			else
				printf("%s\n",buffer);
		}
	}
	if (count_lines)
		printf("%s was found from %d line(s)\n",string,count);
	return 0;
}