Linux-C strlen()与sizeof

#include #include int main(int argc,char* argv[]) { char* p_ch = "hello"; char ch_arr[] = "hello"; printf("p:%d \n",strlen(p_ch)); printf("ch_arr:%d \n",strlen(ch_arr));//但是数组的长度是6，包含了'\0' printf("hello:%d \n",strlen("hello")); return 0; }

#include int strlen(const char * str);//函数声明 int main(int argc,char* argv[]) { char* p_ch = "hello"; char ch_arr[] = "hello"; printf("p:%d \n",strlen(p_ch)); printf("ch_arr:%d \n",strlen(ch_arr)); printf("hello:%d \n",strlen("hello")); return 0; } int strlen(const char * str)//const限定函数内部不能改变str { int length = 0; while(str[length++]!='\n'); return length; }

#include int main(int argc,char* argv[]) { char ch = 'a'; int num = 10; float fl= 1.23f; double db = 4.567; char* p_ch = "hello"; char ch_arr[] = "hello"; printf("10:%d \n",sizeof(10)); printf("1.23f:%d \n",sizeof(1.23f)); printf("4.567:%d \n\n",sizeof(4.567)); printf("a:%d \n",sizeof(ch)); printf("num:%d \n",sizeof(num)); printf("fl:%d \n",sizeof(fl)); printf("db:%d \n\n",sizeof(db)); printf("char:%d \n",sizeof(char)); printf("int:%d \n",sizeof(int)); printf("float:%d \n",sizeof(float)); printf("double:%d \n\n",sizeof(double)); printf("ch:%d \n",sizeof ch); printf("num:%d \n",sizeof num); printf("fl:%d \n",sizeof fl); printf("db:%d \n\n",sizeof db); printf("p_ch:%d \n",sizeof(p_ch)); printf("ch_arr:%d \n",sizeof(ch_arr)); printf("hello:%d \n",sizeof("hello")); return 0; }

Disassembly of section .init: 080482f8 <_init>: 80482f8: 53 push %ebx 80482f9: 83 ec 08 sub $0x8,%esp 80482fc: e8 00 00 00 00 call 8048301 <_init+0x9> 8048301: 5b pop %ebx 8048302: 81 c3 f3 1c 00 00 add $0x1cf3,%ebx 8048308: 8b 83 fc ff ff ff mov -0x4(%ebx),%eax 804830e: 85 c0 test %eax,%eax 8048310: 74 05 je 8048317 <_init+0x1f> 8048312: e8 49 00 00 00 call 8048360 <__gmon_start__@plt> 8048317: e8 f4 00 00 00 call 8048410 804831c: e8 7f 03 00 00 call 80486a0 <__do_global_ctors_aux> 8048321: 83 c4 08 add $0x8,%esp 8048324: 5b pop %ebx 8048325: c3 ret Disassembly of section .plt: 08048330 : 8048330: ff 35 f8 9f 04 08 pushl 0x8049ff8 8048336: ff 25 fc 9f 04 08 jmp *0x8049ffc 804833c: 00 00 add %al,(%eax) ... 08048340 : 8048340: ff 25 00 a0 04 08 jmp *0x804a000 8048346: 68 00 00 00 00 push $0x0 804834b: e9 e0 ff ff ff jmp 8048330 <_init+0x38> 08048350 <__stack_chk_fail@plt>: 8048350: ff 25 04 a0 04 08 jmp *0x804a004 8048356: 68 08 00 00 00 push $0x8 804835b: e9 d0 ff ff ff jmp 8048330 <_init+0x38> 08048360 <__gmon_start__@plt>: 8048360: ff 25 08 a0 04 08 jmp *0x804a008 8048366: 68 10 00 00 00 push $0x10 804836b: e9 c0 ff ff ff jmp 8048330 <_init+0x38> 08048370 <__libc_start_main@plt>: 8048370: ff 25 0c a0 04 08 jmp *0x804a00c 8048376: 68 18 00 00 00 push $0x18 804837b: e9 b0 ff ff ff jmp 8048330 <_init+0x38> Disassembly of section .text: 08048380 <_start>: 8048380: 31 ed xor %ebp,%ebp 8048382: 5e pop %esi 8048383: 89 e1 mov %esp,%ecx 8048385: 83 e4 f0 and $0xfffffff0,%esp 8048388: 50 push %eax 8048389: 54 push %esp 804838a: 52 push %edx 804838b: 68 90 86 04 08 push $0x8048690 8048390: 68 20 86 04 08 push $0x8048620 8048395: 51 push %ecx 8048396: 56 push %esi 8048397: 68 34 84 04 08 push $0x8048434 804839c: e8 cf ff ff ff call 8048370 <__libc_start_main@plt> 80483a1: f4 hlt 80483a2: 90 nop 80483a3: 90 nop 80483a4: 90 nop 80483a5: 90 nop 80483a6: 90 nop 80483a7: 90 nop 80483a8: 90 nop 80483a9: 90 nop 80483aa: 90 nop 80483ab: 90 nop 80483ac: 90 nop 80483ad: 90 nop 80483ae: 90 nop 80483af: 90 nop 080483b0 <__do_global_dtors_aux>: 80483b0: 55 push %ebp 80483b1: 89 e5 mov %esp,%ebp 80483b3: 53 push %ebx 80483b4: 83 ec 04 sub $0x4,%esp 80483b7: 80 3d 18 a0 04 08 00 cmpb $0x0,0x804a018 80483be: 75 3f jne 80483ff <__do_global_dtors_aux+0x4f> 80483c0: a1 1c a0 04 08 mov 0x804a01c,%eax 80483c5: bb 20 9f 04 08 mov $0x8049f20,%ebx 80483ca: 81 eb 1c 9f 04 08 sub $0x8049f1c,%ebx 80483d0: c1 fb 02 sar $0x2,%ebx 80483d3: 83 eb 01 sub $0x1,%ebx 80483d6: 39 d8 cmp %ebx,%eax 80483d8: 73 1e jae 80483f8 <__do_global_dtors_aux+0x48> 80483da: 8d b6 00 00 00 00 lea 0x0(%esi),%esi 80483e0: 83 c0 01 add $0x1,%eax 80483e3: a3 1c a0 04 08 mov %eax,0x804a01c 80483e8: ff 14 85 1c 9f 04 08 call *0x8049f1c(,%eax,4) 80483ef: a1 1c a0 04 08 mov 0x804a01c,%eax 80483f4: 39 d8 cmp %ebx,%eax 80483f6: 72 e8 jb 80483e0 <__do_global_dtors_aux+0x30> 80483f8: c6 05 18 a0 04 08 01 movb $0x1,0x804a018 80483ff: 83 c4 04 add $0x4,%esp 8048402: 5b pop %ebx 8048403: 5d pop %ebp 8048404: c3 ret 8048405: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi 8048409: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi 08048410 : 8048410: 55 push %ebp 8048411: 89 e5 mov %esp,%ebp 8048413: 83 ec 18 sub $0x18,%esp 8048416: a1 24 9f 04 08 mov 0x8049f24,%eax 804841b: 85 c0 test %eax,%eax 804841d: 74 12 je 8048431 804841f: b8 00 00 00 00 mov $0x0,%eax 8048424: 85 c0 test %eax,%eax 8048426: 74 09 je 8048431 8048428: c7 04 24 24 9f 04 08 movl $0x8049f24,(%esp) 804842f: ff d0 call *%eax 8048431: c9 leave 8048432: c3 ret 8048433: 90 nop 08048434

: 8048434: 55 push %ebp 8048435: 89 e5 mov %esp,%ebp 8048437: 83 e4 f0 and $0xfffffff0,%esp 804843a: 83 ec 40 sub $0x40,%esp 804843d: 8b 45 0c mov 0xc(%ebp),%eax 8048440: 89 44 24 1c mov %eax,0x1c(%esp) 8048444: 65 a1 14 00 00 00 mov %gs:0x14,%eax 804844a: 89 44 24 3c mov %eax,0x3c(%esp) 804844e: 31 c0 xor %eax,%eax 8048450: c6 44 24 35 61 movb $0x61,0x35(%esp) 8048455: c7 44 24 28 0a 00 00 movl $0xa,0x28(%esp) 804845c: 00 804845d: b8 a4 70 9d 3f mov $0x3f9d70a4,%eax 8048462: 89 44 24 2c mov %eax,0x2c(%esp) 8048466: dd 05 90 87 04 08 fldl 0x8048790 804846c: dd 5c 24 20 fstpl 0x20(%esp) 8048470: c7 44 24 30 f0 86 04 movl $0x80486f0,0x30(%esp) 8048477: 08 8048478: c7 44 24 36 68 65 6c movl $0x6c6c6568,0x36(%esp) 804847f: 6c 8048480: 66 c7 44 24 3a 6f 00 movw $0x6f,0x3a(%esp) 8048487: b8 f6 86 04 08 mov $0x80486f6,%eax 804848c: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 8048493: 00 8048494: 89 04 24 mov %eax,(%esp) 8048497: e8 a4 fe ff ff call 8048340 804849c: b8 fe 86 04 08 mov $0x80486fe,%eax 80484a1: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80484a8: 00 80484a9: 89 04 24 mov %eax,(%esp) 80484ac: e8 8f fe ff ff call 8048340 80484b1: b8 09 87 04 08 mov $0x8048709,%eax 80484b6: c7 44 24 04 08 00 00 movl $0x8,0x4(%esp) 80484bd: 00 80484be: 89 04 24 mov %eax,(%esp) 80484c1: e8 7a fe ff ff call 8048340 80484c6: b8 15 87 04 08 mov $0x8048715,%eax 80484cb: c7 44 24 04 01 00 00 movl $0x1,0x4(%esp) 80484d2: 00 80484d3: 89 04 24 mov %eax,(%esp) 80484d6: e8 65 fe ff ff call 8048340 80484db: b8 1c 87 04 08 mov $0x804871c,%eax 80484e0: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80484e7: 00 80484e8: 89 04 24 mov %eax,(%esp) 80484eb: e8 50 fe ff ff call 8048340 80484f0: b8 25 87 04 08 mov $0x8048725,%eax 80484f5: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80484fc: 00 80484fd: 89 04 24 mov %eax,(%esp) 8048500: e8 3b fe ff ff call 8048340 8048505: b8 2d 87 04 08 mov $0x804872d,%eax 804850a: c7 44 24 04 08 00 00 movl $0x8,0x4(%esp) 8048511: 00 8048512: 89 04 24 mov %eax,(%esp) 8048515: e8 26 fe ff ff call 8048340 804851a: b8 36 87 04 08 mov $0x8048736,%eax 804851f: c7 44 24 04 01 00 00 movl $0x1,0x4(%esp) 8048526: 00 8048527: 89 04 24 mov %eax,(%esp) 804852a: e8 11 fe ff ff call 8048340 804852f: b8 40 87 04 08 mov $0x8048740,%eax 8048534: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 804853b: 00 804853c: 89 04 24 mov %eax,(%esp) 804853f: e8 fc fd ff ff call 8048340 8048544: b8 49 87 04 08 mov $0x8048749,%eax 8048549: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 8048550: 00 8048551: 89 04 24 mov %eax,(%esp) 8048554: e8 e7 fd ff ff call 8048340 8048559: b8 54 87 04 08 mov $0x8048754,%eax 804855e: c7 44 24 04 08 00 00 movl $0x8,0x4(%esp) 8048565: 00 8048566: 89 04 24 mov %eax,(%esp) 8048569: e8 d2 fd ff ff call 8048340 804856e: b8 61 87 04 08 mov $0x8048761,%eax 8048573: c7 44 24 04 01 00 00 movl $0x1,0x4(%esp) 804857a: 00 804857b: 89 04 24 mov %eax,(%esp) 804857e: e8 bd fd ff ff call 8048340 8048583: b8 1c 87 04 08 mov $0x804871c,%eax 8048588: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 804858f: 00 8048590: 89 04 24 mov %eax,(%esp) 8048593: e8 a8 fd ff ff call 8048340 8048598: b8 25 87 04 08 mov $0x8048725,%eax 804859d: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80485a4: 00 80485a5: 89 04 24 mov %eax,(%esp) 80485a8: e8 93 fd ff ff call 8048340 80485ad: b8 2d 87 04 08 mov $0x804872d,%eax 80485b2: c7 44 24 04 08 00 00 movl $0x8,0x4(%esp) 80485b9: 00 80485ba: 89 04 24 mov %eax,(%esp) 80485bd: e8 7e fd ff ff call 8048340 80485c2: b8 69 87 04 08 mov $0x8048769,%eax 80485c7: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80485ce: 00 80485cf: 89 04 24 mov %eax,(%esp) 80485d2: e8 69 fd ff ff call 8048340 80485d7: b8 73 87 04 08 mov $0x8048773,%eax 80485dc: c7 44 24 04 06 00 00 movl $0x6,0x4(%esp) 80485e3: 00 80485e4: 89 04 24 mov %eax,(%esp) 80485e7: e8 54 fd ff ff call 8048340 80485ec: b8 7f 87 04 08 mov $0x804877f,%eax 80485f1: c7 44 24 04 06 00 00 movl $0x6,0x4(%esp) 80485f8: 00 80485f9: 89 04 24 mov %eax,(%esp) 80485fc: e8 3f fd ff ff call 8048340 8048601: b8 00 00 00 00 mov $0x0,%eax 8048606: 8b 54 24 3c mov 0x3c(%esp),%edx 804860a: 65 33 15 14 00 00 00 xor %gs:0x14,%edx 8048611: 74 05 je 8048618 8048613: e8 38 fd ff ff call 8048350 <__stack_chk_fail@plt> 8048618: c9 leave 8048619: c3 ret 804861a: 90 nop 804861b: 90 nop 804861c: 90 nop 804861d: 90 nop 804861e: 90 nop 804861f: 90 nop 08048620 <__libc_csu_init>: 8048620: 55 push %ebp 8048621: 57 push %edi 8048622: 56 push %esi 8048623: 53 push %ebx 8048624: e8 69 00 00 00 call 8048692 <__i686.get_pc_thunk.bx> 8048629: 81 c3 cb 19 00 00 add $0x19cb,%ebx 804862f: 83 ec 1c sub $0x1c,%esp 8048632: 8b 6c 24 30 mov 0x30(%esp),%ebp 8048636: 8d bb 20 ff ff ff lea -0xe0(%ebx),%edi 804863c: e8 b7 fc ff ff call 80482f8 <_init> 8048641: 8d 83 20 ff ff ff lea -0xe0(%ebx),%eax 8048647: 29 c7 sub %eax,%edi 8048649: c1 ff 02 sar $0x2,%edi 804864c: 85 ff test %edi,%edi 804864e: 74 29 je 8048679 <__libc_csu_init+0x59> 8048650: 31 f6 xor %esi,%esi 8048652: 8d b6 00 00 00 00 lea 0x0(%esi),%esi 8048658: 8b 44 24 38 mov 0x38(%esp),%eax 804865c: 89 2c 24 mov %ebp,(%esp) 804865f: 89 44 24 08 mov %eax,0x8(%esp) 8048663: 8b 44 24 34 mov 0x34(%esp),%eax 8048667: 89 44 24 04 mov %eax,0x4(%esp) 804866b: ff 94 b3 20 ff ff ff call *-0xe0(%ebx,%esi,4) 8048672: 83 c6 01 add $0x1,%esi 8048675: 39 fe cmp %edi,%esi 8048677: 75 df jne 8048658 <__libc_csu_init+0x38> 8048679: 83 c4 1c add $0x1c,%esp 804867c: 5b pop %ebx 804867d: 5e pop %esi 804867e: 5f pop %edi 804867f: 5d pop %ebp 8048680: c3 ret 8048681: eb 0d jmp 8048690 <__libc_csu_fini> 8048683: 90 nop 8048684: 90 nop 8048685: 90 nop 8048686: 90 nop 8048687: 90 nop 8048688: 90 nop 8048689: 90 nop 804868a: 90 nop 804868b: 90 nop 804868c: 90 nop 804868d: 90 nop 804868e: 90 nop 804868f: 90 nop 08048690 <__libc_csu_fini>: 8048690: f3 c3 repz ret 08048692 <__i686.get_pc_thunk.bx>: 8048692: 8b 1c 24 mov (%esp),%ebx 8048695: c3 ret 8048696: 90 nop 8048697: 90 nop 8048698: 90 nop 8048699: 90 nop 804869a: 90 nop 804869b: 90 nop 804869c: 90 nop 804869d: 90 nop 804869e: 90 nop 804869f: 90 nop 080486a0 <__do_global_ctors_aux>: 80486a0: 55 push %ebp 80486a1: 89 e5 mov %esp,%ebp 80486a3: 53 push %ebx 80486a4: 83 ec 04 sub $0x4,%esp 80486a7: a1 14 9f 04 08 mov 0x8049f14,%eax 80486ac: 83 f8 ff cmp $0xffffffff,%eax 80486af: 74 13 je 80486c4 <__do_global_ctors_aux+0x24> 80486b1: bb 14 9f 04 08 mov $0x8049f14,%ebx 80486b6: 66 90 xchg %ax,%ax 80486b8: 83 eb 04 sub $0x4,%ebx 80486bb: ff d0 call *%eax 80486bd: 8b 03 mov (%ebx),%eax 80486bf: 83 f8 ff cmp $0xffffffff,%eax 80486c2: 75 f4 jne 80486b8 <__do_global_ctors_aux+0x18> 80486c4: 83 c4 04 add $0x4,%esp 80486c7: 5b pop %ebx 80486c8: 5d pop %ebp 80486c9: c3 ret 80486ca: 90 nop 80486cb: 90 nop Disassembly of section .fini: 080486cc <_fini>: 80486cc: 53 push %ebx 80486cd: 83 ec 08 sub $0x8,%esp 80486d0: e8 00 00 00 00 call 80486d5 <_fini+0x9> 80486d5: 5b pop %ebx 80486d6: 81 c3 1f 19 00 00 add $0x191f,%ebx 80486dc: e8 cf fc ff ff call 80483b0 <__do_global_dtors_aux> 80486e1: 83 c4 08 add $0x8,%esp 80486e4: 5b pop %ebx 80486e5: c3 ret$0x4,0x4(%esp) 8048493: 00 8048494: 89 04 24 mov %eax,(%esp) 8048497: e8 a4 fe ff ff call 8048340 804849c: b8 fe 86 04 08 mov $0x80486fe,%eax 80484a1: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80484a8: 00 80484a9: 89 04 24 mov %eax,(%esp) 80484ac: e8 8f fe ff ff call 8048340 80484b1: b8 09 87 04 08 mov $0x8048709,%eax 80484b6: c7 44 24 04 08 00 00 movl $0x8,0x4(%esp) 80484bd: 00 80484be: 89 04 24 mov %eax,(%esp) 80484c1: e8 7a fe ff ff call 8048340 80484c6: b8 15 87 04 08 mov $0x8048715,%eax 80484cb: c7 44 24 04 01 00 00 movl $0x1,0x4(%esp) 80484d2: 00 80484d3: 89 04 24 mov %eax,(%esp) 80484d6: e8 65 fe ff ff call 8048340 80484db: b8 1c 87 04 08 mov $0x804871c,%eax 80484e0: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80484e7: 00 80484e8: 89 04 24 mov %eax,(%esp) 80484eb: e8 50 fe ff ff call 8048340 80484f0: b8 25 87 04 08 mov $0x8048725,%eax 80484f5: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80484fc: 00 80484fd: 89 04 24 mov %eax,(%esp) 8048500: e8 3b fe ff ff call 8048340 8048505: b8 2d 87 04 08 mov $0x804872d,%eax 804850a: c7 44 24 04 08 00 00 movl $0x8,0x4(%esp) 8048511: 00 8048512: 89 04 24 mov %eax,(%esp) 8048515: e8 26 fe ff ff call 8048340 804851a: b8 36 87 04 08 mov $0x8048736,%eax 804851f: c7 44 24 04 01 00 00 movl $0x1,0x4(%esp) 8048526: 00 8048527: 89 04 24 mov %eax,(%esp) 804852a: e8 11 fe ff ff call 8048340 804852f: b8 40 87 04 08 mov $0x8048740,%eax 8048534: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 804853b: 00 804853c: 89 04 24 mov %eax,(%esp) 804853f: e8 fc fd ff ff call 8048340 8048544: b8 49 87 04 08 mov $0x8048749,%eax 8048549: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 8048550: 00 8048551: 89 04 24 mov %eax,(%esp) 8048554: e8 e7 fd ff ff call 8048340 8048559: b8 54 87 04 08 mov $0x8048754,%eax 804855e: c7 44 24 04 08 00 00 movl $0x8,0x4(%esp) 8048565: 00 8048566: 89 04 24 mov %eax,(%esp) 8048569: e8 d2 fd ff ff call 8048340 804856e: b8 61 87 04 08 mov $0x8048761,%eax 8048573: c7 44 24 04 01 00 00 movl $0x1,0x4(%esp) 804857a: 00 804857b: 89 04 24 mov %eax,(%esp) 804857e: e8 bd fd ff ff call 8048340 8048583: b8 1c 87 04 08 mov $0x804871c,%eax 8048588: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 804858f: 00 8048590: 89 04 24 mov %eax,(%esp) 8048593: e8 a8 fd ff ff call 8048340 8048598: b8 25 87 04 08 mov $0x8048725,%eax 804859d: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80485a4: 00 80485a5: 89 04 24 mov %eax,(%esp) 80485a8: e8 93 fd ff ff call 8048340 80485ad: b8 2d 87 04 08 mov $0x804872d,%eax 80485b2: c7 44 24 04 08 00 00 movl $0x8,0x4(%esp) 80485b9: 00 80485ba: 89 04 24 mov %eax,(%esp) 80485bd: e8 7e fd ff ff call 8048340 80485c2: b8 69 87 04 08 mov $0x8048769,%eax 80485c7: c7 44 24 04 04 00 00 movl $0x4,0x4(%esp) 80485ce: 00 80485cf: 89 04 24 mov %eax,(%esp) 80485d2: e8 69 fd ff ff call 8048340 80485d7: b8 73 87 04 08 mov $0x8048773,%eax 80485dc: c7 44 24 04 06 00 00 movl $0x6,0x4(%esp) 80485e3: 00 80485e4: 89 04 24 mov %eax,(%esp) 80485e7: e8 54 fd ff ff call 8048340 80485ec: b8 7f 87 04 08 mov $0x804877f,%eax 80485f1: c7 44 24 04 06 00 00 movl $0x6,0x4(%esp) 80485f8: 00 80485f9: 89 04 24 mov %eax,(%esp) 80485fc: e8 3f fd ff ff call 8048340 8048601: b8 00 00 00 00 mov $0x0,%eax 8048606: 8b 54 24 3c mov 0x3c(%esp),%edx 804860a: 65 33 15 14 00 00 00 xor %gs:0x14,%edx 8048611: 74 05 je 8048618 8048613: e8 38 fd ff ff call 8048350 <__stack_chk_fail@plt> 8048618: c9 leave 8048619: c3 ret 804861a: 90 nop 804861b: 90 nop 804861c: 90 nop 804861d: 90 nop 804861e: 90 nop 804861f: 90 nop 08048620 <__libc_csu_init>: 8048620: 55 push %ebp 8048621: 57 push %edi 8048622: 56 push %esi 8048623: 53 push %ebx 8048624: e8 69 00 00 00 call 8048692 <__i686.get_pc_thunk.bx> 8048629: 81 c3 cb 19 00 00 add $0x19cb,%ebx 804862f: 83 ec 1c sub $0x1c,%esp 8048632: 8b 6c 24 30 mov 0x30(%esp),%ebp 8048636: 8d bb 20 ff ff ff lea -0xe0(%ebx),%edi 804863c: e8 b7 fc ff ff call 80482f8 <_init> 8048641: 8d 83 20 ff ff ff lea -0xe0(%ebx),%eax 8048647: 29 c7 sub %eax,%edi 8048649: c1 ff 02 sar $0x2,%edi 804864c: 85 ff test %edi,%edi 804864e: 74 29 je 8048679 <__libc_csu_init+0x59> 8048650: 31 f6 xor %esi,%esi 8048652: 8d b6 00 00 00 00 lea 0x0(%esi),%esi 8048658: 8b 44 24 38 mov 0x38(%esp),%eax 804865c: 89 2c 24 mov %ebp,(%esp) 804865f: 89 44 24 08 mov %eax,0x8(%esp) 8048663: 8b 44 24 34 mov 0x34(%esp),%eax 8048667: 89 44 24 04 mov %eax,0x4(%esp) 804866b: ff 94 b3 20 ff ff ff call *-0xe0(%ebx,%esi,4) 8048672: 83 c6 01 add $0x1,%esi 8048675: 39 fe cmp %edi,%esi 8048677: 75 df jne 8048658 <__libc_csu_init+0x38> 8048679: 83 c4 1c add $0x1c,%esp 804867c: 5b pop %ebx 804867d: 5e pop %esi 804867e: 5f pop %edi 804867f: 5d pop %ebp 8048680: c3 ret 8048681: eb 0d jmp 8048690 <__libc_csu_fini> 8048683: 90 nop 8048684: 90 nop 8048685: 90 nop 8048686: 90 nop 8048687: 90 nop 8048688: 90 nop 8048689: 90 nop 804868a: 90 nop 804868b: 90 nop 804868c: 90 nop 804868d: 90 nop 804868e: 90 nop 804868f: 90 nop 08048690 <__libc_csu_fini>: 8048690: f3 c3 repz ret 08048692 <__i686.get_pc_thunk.bx>: 8048692: 8b 1c 24 mov (%esp),%ebx 8048695: c3 ret 8048696: 90 nop 8048697: 90 nop 8048698: 90 nop 8048699: 90 nop 804869a: 90 nop 804869b: 90 nop 804869c: 90 nop 804869d: 90 nop 804869e: 90 nop 804869f: 90 nop 080486a0 <__do_global_ctors_aux>: 80486a0: 55 push %ebp 80486a1: 89 e5 mov %esp,%ebp 80486a3: 53 push %ebx 80486a4: 83 ec 04 sub $0x4,%esp 80486a7: a1 14 9f 04 08 mov 0x8049f14,%eax 80486ac: 83 f8 ff cmp $0xffffffff,%eax 80486af: 74 13 je 80486c4 <__do_global_ctors_aux+0x24> 80486b1: bb 14 9f 04 08 mov $0x8049f14,%ebx 80486b6: 66 90 xchg %ax,%ax 80486b8: 83 eb 04 sub $0x4,%ebx 80486bb: ff d0 call *%eax 80486bd: 8b 03 mov (%ebx),%eax 80486bf: 83 f8 ff cmp $0xffffffff,%eax 80486c2: 75 f4 jne 80486b8 <__do_global_ctors_aux+0x18> 80486c4: 83 c4 04 add $0x4,%esp 80486c7: 5b pop %ebx 80486c8: 5d pop %ebp 80486c9: c3 ret 80486ca: 90 nop 80486cb: 90 nop Disassembly of section .fini: 080486cc <_fini>: 80486cc: 53 push %ebx 80486cd: 83 ec 08 sub $0x8,%esp 80486d0: e8 00 00 00 00 call 80486d5 <_fini+0x9> 80486d5: 5b pop %ebx 80486d6: 81 c3 1f 19 00 00 add $0x191f,%ebx 80486dc: e8 cf fc ff ff call 80483b0 <__do_global_dtors_aux> 80486e1: 83 c4 08 add $0x8,%esp 80486e4: 5b pop %ebx 80486e5: c3 ret

Linux-C strlen()与sizeof

Linux-C strlen()与sizeof

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