Thread: Struggling w/ string_replacement function

Hello all, this is the last problem on a hmwk assignment of mine, and I am really getting frustrated over it. I am having probs writing my str_replace function...

Basically, what this program needs to do is the following:

Input sentence : This is very fun.
S (search) = very
R (replace) = not
Output sentence: This is not fun.

This is my thought process for this program:

-have it look through the string you give to the function
-if you find a character that matches the first character of the word to replace then keep checking to see if the whole word is there.
-If it is, then don't add that new word to a temp string, but add the rest and insert the replacement string.

Below is what I have up to now... my replace function may be really wrong, I honestly do not know for sure.... any help would be great. If anyone can walk me through the darn function that would help a lot too, I'm just confused.

Code:

#include<stdio.h>
#define MAX_LEN 100

int strlen(char *s)
{
	char *p=s;
	
	while(*p!='\0')
		p++;
		return p-s;
}

void strcopy(char *x, char *y)
{
	int i=0;
	
	while(*x!='\0') {
		*y=*x;
		x++;
		y++;
	}
	*y='\0';
} 
 
int strcomp(char *x, char *y)
{
	while((*x==*y)&&(*x!='\0')&&(*y!='\0')) {
		x++;
		y++;
	}
 
	if(*x<*y)
		return 1;
	else if(*x==*y)
		return 0;
	else
		return -1;
}
  
string_replace(char *orig_text, char *search, char *replace)
{
	int *p, *temp, len;
	char array;
	p=orig_text;
	*temp=array[0];
	
	len=strlen(search);
	
	while(p!='\0') {
		if(*p==*search) {
			temp=&temp[0];
				for(i=1; i<=strlen(search); i++)
    				*temp=*p;
    					p++;
    					temp++;
			strcomp(temp, search);
		else if(*p!=*search)
			p++;
		
		/*  I am really gettin confused w/ this function at this point...  how do I start to check character by character, etc? */
			
		}
		
		
	}	
}

main()
{
	char original_str[MAX_LEN], s_str[MAX_LEN], r_str[MAX_LEN], outp_str[MAX_LEN];
	int index;
	
	printf("Original text:");
	gets(original_str);
	
	printf("s=:");
	gets(s_str); 
	
	printf("r=:");
	gets(r_str);
	
	printf("New Sentence: %s %s, %s\n", original_str, s_str, r_str);
}