strstr problem...

This is a discussion on strstr problem... within the C Programming forums, part of the General Programming Boards category; Hi folks... So this is my Code: Code: #include <stdio.h> #include <string.h> int main(void) { char *str1 = "Find a ...

  1. #1
    Registered User client's Avatar
    Join Date
    May 2002
    Posts
    12

    Angry 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

  2. #2
    Registered User sean345's Avatar
    Join Date
    Mar 2002
    Posts
    346
    >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
    If cities were built like software is built, the first woodpecker to come along would level civilization.
    Black Frog Studios

  3. #3
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
    Posts
    6,231

    Re: strstr problem...

    >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).
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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