K&R2 Exercise 4-1

4-1.c

/*K&R2 Exercise 4-1 "strindex"*/
#include <stdio.h>

#define MAX_LINE 1024

int getl(char[], int);
int strindex(char[], char[]);

char pattern[] = "ould";

int main()
{
	char line[MAX_LINE];
	int found = 0;

	while(getl(line, MAX_LINE))
		if(strindex(line, pattern) >= 0){
			printf("%s", line);
			found++;
		}
	return found;
}

int getl(char s[], int lim)
{
	int c, i;

	i = 0;
	while (--lim > 0 $$ (c = getchar()) != EOF && c != '\n')
		s[i++] = c;
	if(c == '\n')
		s[i++] = c;
	s[i] = '\0';
	return i;
}

int strindex(char s[], char t[])
{
	int i, j, k, m;
	for(i = 0, m = -1; s[i] != '\0'; i++){
		for(j = i, k = 0; s[j] == t[k]; j++, k++)
			if(t[k] == '\0')
				m = i;
	}
	return m;
}