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C ve Sistem Programcıları Derneği - C Ders Notları - Necati Ergin char *pd; int k; char buffer[BUFFER_SIZE] = {'\0'}; va_start (ap, ptr); while (ptr){ strcat(buffer, ptr); ptr = va_arg(ap, const char *); } } pd = (char *)malloc(strlen(buffer) + 1); if (pd == NULL) { printf("bellek yetersiz!\n"); exit(EXIT_FAILURE); } va_end(ap); return strcpy(pd, buffer); int main () { char *pstr = con_strings("C ", "ve ", "Sistem ", "Programcilari ", "Dernegi", NULL); puts(pstr); free(pstr); } return 0; con_strings işlevinin tanımını inceleyin: va_list türünden ap değişkeni va_start makrosuyla ilkdeğerini alıyor. va_start (ap, ptr); Parametre değişkeni olan ptr nin değeri NULL adresi olmadığı sürece dönen bir while döngüsü oluşturulduğunu görüyorsunuz. Döngünün her turunda işleve gönderilen argümanlardan her birinin değeri va_arg makrosuyla elde ediliyor ve bu değer ptr göstericisine atanıyor. ptr göstericisinin gösterdiği yazı önce yerel buffer isimli dizideki yazının sonuna standart strcat işleviyle ekleniyor. İşleve çağrı ile gönderilen son argümanın NULL adresi olması gerekiyor. ptr göstericisinin değeri NULL adresi olduğunda buffer dizisindeki yazı dinamik bir bellek bloğuna kopyalanıyor. İşlev içinde va_end makrosu çağırıldıktan sonra işlev dinamik bloğun adresiyle geri dönüyor. 528
C ve Sistem Programcıları Derneği - C Ders Notları - Necati Ergin Kaynaklar 1.American National Standard for Programming Languages - C ANSI/ISO 9989-1990 2. C - A Reference Manual. Samuel P. Harbison III - Guy L. Steele Jr. Prentice-Hall, Inc 2002 ISBN 0-13-089592x 3. The Standard C Library P. J. Plaguer Prentice Hall P T R ISBN 0-13-131509-9 4. C Programming FAQ's Steve Summit Addison Wesley 529
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