strstr problem...

Hi folks...

So this is my Code:

Code:

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

int main(void)
{
   char *str1 = "Find a Word in this String", *str2 = "Word", *ptr;

   ptr = strstr(str1, str2);

   if(ptr)
      printf("String Found");
   else
      printf("Not Found !");
}

but this code did not fulfill my expectations...
So to my problem...

1. How can I search for a word in a string non-Case senstive... (using this code)
2. strstr also gives a ptr = 1 if I search for 'ord', is there any possibility to search for the exact phrase... 'word' only conisdering the non-Casetive function (again using this code)

Thanks in advance
Client

>1. How can I search for a word in a string non-Case senstive... (using this code)

Well instead of using strstr you will have to use a function that does not depend on case. I have one here available from the merlin functions. It is called mstrstr and can be used just like strstr.

Code:

char* mstrstr(char *s1, const char *s2)
{
	size_t i, value;
	char *p;

	char *s1b, *s2b;

	if (strlen(s1)<strlen(s2))
		return NULL;

	if (*s1=='\0' || *s2=='\0')
		return NULL;


	s1b=malloc(strlen(s1)+1);
	s2b=malloc(strlen(s2)+1);

	if(s1b==NULL || s2b==NULL)
	{
	free(s1b);
	free(s2b);
	return NULL;
	}

	strcpy(s1b, s1);
	strcpy(s2b, s2);

	for(i=0; (s1b[i]=tolower(s1b[i]))!=0; i++)
	;


	for(i=0; (s2b[i]=tolower(s2b[i]))!=0; ++i)
	;


	p=strstr(s1b, s2b);

	if(p==0)
	{
	free(s1b);
	free(s2b);
	return NULL;
	}

	else
	{
	value=p-s1b;
	free(s1b);
	free(s2b);
	return &s1[value];
	}
}

- Sean

>1. How can I search for a word in a string non-Case senstive... (using this code)
You can't using that code. I'd suggest you convert both strings to lower case, then do the same search again.

>2. strstr also gives a ptr = 1 if I search for 'ord', is there any possibility to search for the exact phrase... 'word' only conisdering the non-Casetive function (again using this code)
First ptr will not be 1, it will be a memory address, it's the pointer to the start of the second string, as found within the first. If you are looking for a complete word, why not surround you searchfor word with spaces. Special care would need to be taken if the word had a comma after it, or if it was at the end of the string, but it'd be a start.

Another way I can think of is to do a search without searchfor being surrounded by spaces, and when you find it, check the character before and after to see if they are valid word breakers (space, comma, period etc).