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C ve Sistem Programcıları Derneği - C Ders Notları - Necati Ergin türden bir adrestir. Eğer aranan byte bulunamaz ise işlev NULL adresine geri döner. İşlevin başarısı mutlaka sınanmalıdır. İşlev aşağıdaki gibi tanımlanabilir: void *mymemchr(const void *p_block, int c, unsigned int nbytes) { const char *p = p_block; } while (nbytes--) { if (*p == c) return (void *)p; p++; } return NULL; memcmp işlevi Standart bir C işlevidir. Adresleri verilen iki bellek bloğunu karşılaştırmak amacıyla kullanılır. İşlevin string.h başlık dosyası içindeki bildirimi aşağıdaki gibidir: int memcmp(const void *pblock1, const void *pblock1, unsigned int nbytes); İşlev block1 ve block2 adreslerinden başlayan nbytes büyüklüğündeki iki bloğu karşılaştırır. İşlevin geri dönüş değeri int türdendir. Geri dönüş değerinin yorumlanması standart strcmp işlevine benzer: İki bellek bloğu tamamen aynıysa, yani iki bloktaki tüm byte'lar birbirine eşitse, işlev 0 değerine geri döner. Birinci bellek bloğu ikinci bellek bloğundan daha büyükse işlev 0'dan büyük bir değere geri döner. Birinci bellek bloğu ikinci bellek bloğundan daha küçükse işlev 0'dan küçük bir değere geri döner. Karşılaştırma şöyle yapılır: Bloklar düşük sayısal adreslerden başlayarak byte byte işaretsiz tamsayı olarak karşılaştırılır. Farklı olan ilk byte ile karşılaşıldığında, daha büyük olan tamsayıya sahip blok daha büyüktür. İşlev aşağıdaki gibi tanımlanabilir: int mymemcmp(const void *vp1, const void *vp2, size_t nbytes) { const unsigned char *p1 = vp1; const unsigned char *p2 = vp2; unsigned int k; for (k = 0; k < nbytes; ++k) if (p1[k] != p2[k]) return p1[k] < p2[k] ? -1 : 1; } return 0; Aşağıda yazılan işlevi sınayan bir main işlevi yazılıyor: int main() { unsigned char s1[100] = {0}; unsigned char s2[100] = {0}; if (!mymemcmp(s1, s2, 100)) printf("bloklar esit!\n"); s1[90] = 1; 288
C ve Sistem Programcıları Derneği - C Ders Notları - Necati Ergin if (mymemcmp(s1, s2, 100) > 0) printf("birinci blok buyuk!\n"); } return 0; 289
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