How find a substring in struct

This is a discussion on How find a substring in struct within the C Programming forums, part of the General Programming Boards category; Hi to All, I need to search the string occurencies in a structure like this: Code: struct node { char ...

  1. #1
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    How find a substring in struct

    Hi to All,

    I need to search the string occurencies in a structure like this:
    Code:
    struct node
    {
       char info[BUFLEN];
       struct node *next;
    };
     
    /* the word to search */
    char myWord[10];
    Can You suggest to me a sample, in order to resolve my problem ?

    Best Regards

  2. #2
    Software Developer jverkoey's Avatar
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  3. #3
    Lean Mean Coding Machine KONI's Avatar
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    What you need is the strstr() function. The prototype of the function is the following:
    Code:
    char * strstr ( const char *, const char * );
    In your case, you need to use it like this:
    Code:
    struct node myNode;
    
    // put some stuff into info
    
    if (strstr(myNode.info, myWord) != NULL)
    {
        puts("I found it!");
    }

  4. #4
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    Quote Originally Posted by KONI View Post
    What you need is the strstr() function.
    Ok,
    But my problem is this:

    In the struct, each node can be for example
    "My oncle is the oncle of Martin"
    "My oncle is engeener"
    etc.

    I need to count the occurencies of word "oncle" in the entire struct. In my example are 3.

    How can perform this?

    By

  5. #5
    Lean Mean Coding Machine KONI's Avatar
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    Quote Originally Posted by jverkoey View Post
    like this.

    You iterate over all the list nodes, use strcmp() to see if the strings match and then increment a counter.

  6. #6
    Software Developer jverkoey's Avatar
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    If you want to search for the number of occurrences within a string, then you need to use strstr. Search for information about the function and you'll see that it returns a non-null char* that points to the exact location of the needle (the string you're searching for) in the haystack (the string you're searching in). Using this char* you can do another strstr to find the next occurrence (if there is one!).

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