linux c之hexdump的实现

#include  #include  #include  #include  //http://androidxref.com/7.1.1_r6/xref/external/avahi/avahi-compat-howl/text-test.c#33 static void hexdump(const void* p, size_t size) { const uint8_t *c = p; assert(p); printf("Dumping %u bytes from %p:\n", size, p); while (size > 0) { unsigned i; for (i = 0; i < 16; i++) { if (i < size) printf("%02x ", c[i]); else printf(" "); } for (i = 0; i < 16; i++) { if (i < size) printf("%c", c[i] >= 32 && c[i] < 127 ? c[i] : '.'); else printf(" "); } printf("\n"); c += 16; if (size <= 16) break; size -= 16; } } //默认8的倍数对齐 4+1+10=15=>16 typedef struct Person { int age; char sex; char city[10]; } Person; //默认8的倍数对齐 4+4+10=18=>24 typedef struct Student2 { Person* parent; //4 //存在指针到文件中的话，指针对应的数据会丢失，因为你只存储了他的地址，没有保存他的数据 int weight;//4 char classroom[10];//10+6 } Student2; int main(void) { Person person; person.age=26; person.sex='m'; strcpy(person.city,"shenzhen"); hexdump(&person,sizeof(person)); Student2 stu; stu.parent=&person;//16 stu.weight=140; memset(stu.classroom,0,sizeof(stu.classroom));//清零，否则是随机值 strcpy(stu.classroom,"204"); hexdump(&stu,sizeof(stu)); FILE* fp=fopen("student2.struct.bin","wb"); fwrite(&stu,sizeof(stu),1,fp); fclose(fp); printf("write_Student2_struct sizeof=%d ok!\n",sizeof(stu));//24 printf("Hello World!\n"); return 0; }

(10条消息) linux c之hexdump的实现_云守护的专栏-CSDN博客