How I Find The Exact Address Of Function Puts

Question

1.00/5 (1 vote)

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Objective-C

#include<stdio.h>
#include<string.h>
int main()
{
char str[100]={0};
char str1[100]={0};
char *p = NULL;
puts("enter a string");
fgets(str,sizeof(str),stdin);
puts("enter substring");
fgets(str1,sizeof(str1),stdin);
p=strstr(str,str1);
if(p)
puts("sub string is a part of main string");
if(!p)
puts("sub string is  not a part of main string");
return 0;
}

I know I can get the address of variables str,str1 using p &str, p &str1 respectively. But how can I get gdb to show me the address of the puts()?

Posted 20-Jul-14 8:36am

Jeevan83

Updated 20-Jul-14 8:37am

v2

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Comments

Kornfeld Eliyahu Peter 20-Jul-14 15:22pm

Can you tell as what for do you need the address of puts() function?

Jeevan83 21-Jul-14 1:27am

Of course I will :). There is this idiotic sir in my coaching classes. He wants every student to write a program as well as address of every line(how they are allocated in the stack) in the code in comments. I want to die! He wants us to write activation records too! But I do not know if this is correct or not because, for str and str1 it is not allocating 100 bytes each. also I am not sure how it is allocating memory both for variables and functions. Guys what do you think? Is this a good practice in any way and is this the correct way to achieve it? @Kornfeld Eliyahu Peter

Sergey Alexandrovich Kryukov 20-Jul-14 21:08pm

Why?
—SA

Jeevan83 21-Jul-14 1:27am

Of course I will :). There is this idiotic sir in my coaching classes. He wants every student to write a program as well as address of every line(how they are allocated in the stack) in the code in comments. I want to die! He wants us to write activation records too! But I do not know if this is correct or not because, for str and str1 it is not allocating 100 bytes each. also I am not sure how it is allocating memory both for variables and functions. Guys what do you think? Is this a good practice in any way and is this the correct way to achieve it? @Sergey Alexandrovich Kryukov

Jeevan83 21-Jul-14 14:13pm

reply please guys!!!!!

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Sergey Alexandrovich Kryukov · Accepted Answer · 2014-07-20T15:33:00

You can use

C++

#include <stdio.h>

//...

int (_cdecl * fpointer)(const char*) = &puts;
// where int (_cdecl * fpointer)(const char*) declares the variable "fpointer"
// of the type "pointer to the function accepting one argument of the type "const ''char*"
// and returning int"

// or even

void* address = &puts;

But why?

Please see, for example: http://www.cprogramming.com/tutorial/function-pointers.html[^].

—SA