Thread: Text Modul | dynamic struct |

Hello,
I will try to explain my question. I am pretty new in C. And i want to program a text modul.
Using dynamic struct and dynamic arrays. it is not a homework its nor more like preperation for a test.


text stuctur: length without \0
dynamic array from type char and \0 should be save


Text prototype:
create(): parameter size, create a new text with a dynamic array, size define size.
it should have more place bcs of ´\0.
init(): parameter c string, with new size, text needs to be create()
data needs to copied by strlen() and strcpy(), it has to be returned
kill(): ofc delete dynamic array, set size on 0 and the pointer on Null
add(): two text struct on value: both text gets to one text.
Firstly the sum of both lengths is the new size. create() makes a new text
then copy the data. Finally return.
print(): text struct on value, data needs to get print.

The Code:

Code:

struct text {
 int length;
 char *zeichen;};
 struct text create(int size);
 struct text init(char string[]);
 void kill(struct text *rS);
 struct text add(struct text a, struct text b);
 void print();

struct
 text create(int size) {
 struct text s = { NULL, size }; s.zeichen = malloc((size + 1) * sizeof(char));
 if (s.zeichen != NULL) {
 s.length = size;}
 return s;}

 void kill(struct text *rS) {
 if (rS->zeichen != NULL)
 free(rS->zeichen); rS->zeichen = NULL; rS->length = 0;}

 struct text init(char zeichen[]) { // copy text and a new length
 struct text newtext = create(strlen(zeichen)); strcpy(newtext, zeichen); //copy the new  text
 return newtext;}

 struct text add(struct text a, struct text b) {
 struct text longtext = create(a.length + b.length);  //size of both text
 strcat(longtext, a);           // text a need to get add to b
 return b;}

 void print(struct text q) {
 printf("%s", q.zeichen);}