Searching an array for another array

[cheeves]

I am writing this program to read 2 strings and to check if the 1st string is a sub-string of the 2nd. I need help writing my function that searches string 2 for string 1 and returns the element number of the first match if it is a sub-string and returns -1 if it is not a sub-string. The function declaration I need help with is:

int str_search(char s1[], int n1,char s2[], int n2);

#include <stdio.h>
#define maxlen 50

void str_set(char s[], int n, char a);
void str_set(char s[], int n, char a)
	{
		int i=n;
		for(n=0; n<i; n++)
			{
				a=getchar();
				s[n] = a;
				if(a == '\n')
					break;
			}
	}

void str_print(char s[], int n);
void str_print(char s[], int n)
	{
		int i=n+1;
		for(n=0; n<i; n++)
		{
			printf("%c", s[n]);
			if(s[n] == '\n')
				break;
		}
	}

int str_search(char s1[], int n1,char s2[], int n2);
int str_search(char s1[], int n1,char s2[], int n2)
	{
		
	}
main()

 {
	char s1;
	char s3;
	char s[maxlen]={32};
	char s2[maxlen]={32};
	int n;
	

	printf("Enter string A.\n");
	str_set(s, maxlen, s1);

	printf("\nEnter string B.\n");
	str_set(s2, maxlen, s3);

	printf("\nString A:\t");
	str_print(s, maxlen);

	printf("\nString B:\t");
	str_print(s2, 40);

	n = str_search(s, 50, s2, 50);
		if(n == -1)
		printf("\nString A is not a sub-string of String B.");
		else
		printf("\nString A is a sub-string of String B.");



 }

[Hammer]

I take it you're not allowed to use strstr(), a standard C function that does what you're asking?

If not, map out the process on paper first, step by step, then translate that to code. A couple of loops should be of use to you.