Appending Character to Character Array In C

Question

I want to Append a character to a character array which represents a String. I am using a Struct to represent the String.

struct String
{   
    char *c;  
    int length;   
    int maxLength;  

}String;

realloc is messing up my array; when I print my string, it prints random things from memory. I feel that I am losing the reference to my string by doing realloc.

    void appendChar(String *target, char c)
    {
        printf("\String: %s\n", target->c); // Prints the String correctly.     

        int newSize = target->length + 1;
        target->length = newSize;

        if(newSize > target->maxLength)
        {
           // Destroys my String.
            target->c= (char*) realloc (target, newSize * sizeof(char));
            target->maxLength = newSize;
        }


        target->c[newSize-1] = ch;
        target->c[newSize] = '\0';

        printf("String: %s\n", target->c); 
    }

Try realloc(target->c, newSize * sizeof(char));. Besides, you can't write to target->c[newSize], the last array cell of the string is target->c[newSize-1]. — PiotrK
– PiotrK, Commented Sep 19, 2013 at 9:40

Yabada · Accepted Answer · 2013-09-19 09:41:57Z

2

You're apllying realloc on your whole structure target, you should do :

target->c= (char*) realloc (target->c, newSize * sizeof(char));

answered Sep 19, 2013 at 9:41

Yabada

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