String Match In C

String Match in C

Program is to find the "String matching pattern from source  string".


#include <stdio.h>
#include <string.h>

int match(char[],char[]);

int main()
{
  char a[100],b[100];
	int position;
	
	printf("Enter some text\n");
	gets(a);
	
	printf("Enter the pattern to find in the string\n");
	gets(b);
	
	position = match(a,b);
	
	if (position !=-1) 
	{
			printf("pos.found at location %d\n:",position+1);
	}
	else 
	{
			printf("Not found\n");
	}
		return 0;
}

int match(char text[],char pattern[]) 
{
	int c,d,e, text_length,pattern_length,position = -1;
	
	text_length = strlen(text);
	pattern_length = strlen(pattern);
	
	if (pattern_length > text_length)
	{
		return -1;
	}	
	for(c=0;c<=text_length-pattern_length;c++)
	{
		position = e = c;
	}
		
	for(d = 0;d < pattern_length;d++)
	{
		if(pattern[d]==text[e])
			{
				e++;
			}
		else
			break;
	}
	if(d==pattern_length) 
	{
		return position;
	}
	return -1;
}