CODEWITHSUNDEEP
arrayscstrncpy
shari
shari

Reputation: 33

Copying a subarray from an array of substrings in c

I'm working on a function which is supposed to take an array of elements defined by a struct.

typedef struct word{
    char word[100];
    double weight;
} word;

The function takes in a pointer, word *words and creates a subarray which includes only the word elements which are above a certain value n.

I want to use strncpy for this, so I wrote the following:

char dest[numwords]; //the number of words in the array
strncpy(dest, *words, numwords -n);

However, I don't think this code will create the subarray I desire. For example, if the array is {"word1", "word2", "word3", "word4", "word5"} and I want the sub array to be {"word4", "word5"}, using the code above, numwords - n = 4-2, which will give me {"word1", "word2", "word3"} instead.

How do I resolve this? Thanks.

Upvotes: -1

Views: 45

Answers (1)

0___________
0___________

Reputation: 67476

char **copyStr(const word *src, size_t nElements)
{
    char **result = NULL;
    if(src && nElements)
    {
        result = malloc(nElements * sizeof(*result));
        if(result)
        {
            for(size_t index = 0; index < nElements; index++)
            {
                size_t len = strlen(src[index].word);
                result[index] = malloc(len + 1);
                if(result[index])
                {
                    memcpy(result[index], src[index].word, len + 1);
                }
                else {/* handle error */}
            }
        }
    }
    return result;
}

Upvotes: 0

Related Questions