A function that refuses to run anywhere else but main()


 
Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers A function that refuses to run anywhere else but main()
# 1  
Old 03-09-2019
A function that refuses to run anywhere else but main()

Hi. I have some code, that for some reason, I could not post it here in this post. Here's the address for it:

#if 0 shc Version 4.0.1, Generic Shell Script Compiler GNU GPL Version 3 Md - Pastebin.com

First off, I used "shc" to convert the code from shell script to C.
And The problem is, I cannot call
Code:
menu()

from anywhere but,
Code:
main()

The error code I get while trying to call this function is this:

Code:
./test22 terminated by signal SIGSEGV (Address boundary error)

I want to call it from within a case statement, like this:


Code:
case 100: // alt-d
     menu();
     break;

I know, that it is a big "NO NO" to use code that is generated by a source code converter, but, i'd rather not use the shell script in my code, just standard C code. So, that is my reasoning for that. Maybe that's the problem right there?

I hope i'm being verbose enough in this post.


Thanks for your time. Any help is appreciated.
# 2  
Old 03-09-2019
Quote:
Originally Posted by ignatius
I know, that it is a big "NO NO" to use code that is generated by a source code converter, but, i'd rather not use the shell script in my code, just standard C code. So, that is my reasoning for that. Maybe that's the problem right there?
Source code converters are OK, in and on themselves, but the problem begins when you try to edit the generated code. Code created by a generator is usually understandable only to the compiler - most likely even the generator is confused reading what it has produced. You don't create an assembler listing from compiled code and change that in assembler either (at least not as long hell is not overbooked and you are sentenced to doing this for your sins instead).

Let us take a step back: what is the reason you don't want to use a shell script? Maybe there is a way to solve this problem without using this abomination in what C was never intended to look like.

I hope this helps.

bakunin
# 3  
Old 03-09-2019
I'd rather keep the code neat and tidy, so to speak. Using a shell script in the code is problematic.. for me. It's just ugly, IMO.


Thanks for the quick response.
# 4  
Old 03-09-2019
Quote:
Originally Posted by ignatius
I'd rather keep the code neat and tidy, so to speak. Using a shell script in the code is problematic.. for me. It's just ugly, IMO.
OK, i can understand that. But why would you want to incorporate a shell script (or its C equivalent) into a C program in first place? What is the script supposed to do that the program can't do? Sorry, but i am confused.

bakunin
# 5  
Old 03-09-2019
Simply because I can't write the code on my own... The shell script does everything that I need it to do, and saves me time by not having to write the code. I'm still a newb at C. Smilie
# 6  
Old 03-09-2019
If you have a working shell script that you think is ugly, why don't you show us that ugly shell code. Maybe we can help you make it pretty or, at least, less ugly. Smilie
# 7  
Old 03-09-2019
Actually, i'd prefer to use it in its C format, first. If I can't do that, then i'll fall back to using the shell script. Thank you for the offer, though. It's appreciated.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

A single statement without main function in c

A sample.c file is written with only one single statement. main; Segmentation fault occurred when executed that file. Any statement other than main; is written, for example unix; then it won't compile. why is this behaviour ! (2 Replies)
Discussion started by: techmonk
2 Replies

2. UNIX for Dummies Questions & Answers

[ksh93+] Array fed by function is empty when used in main.

I feel that i am missing something obvious but i can't find what is wrong. I have a script that is launching some functions with "&" and each call is feeding the array with a value. When all calls are finished I just want to retrieve the values of that array. It is looking like that : ... (5 Replies)
Discussion started by: bibou25
5 Replies

3. AIX

Calling functions from main program from dlopened library function

Hello All, I am trying to call a function from the calling main program from a dlopened library function, below is the entire code, when I execute it it crashes with sigill. Can you guys help me out I guess I am missing out on the linker flag or something here. besides I am new to AIX and... (1 Reply)
Discussion started by: syedtoah
1 Replies

4. Programming

Function main returning int?

H friends, As we know, a function returns a value and that value is saved somwhere. like int Sum( int x, int y ) { return x + y; } Total = Sum( 10, 20 ); The value 30 is saved in variable Total. Now the question is, what int value does the function main return, and where is it... (5 Replies)
Discussion started by: gabam
5 Replies

5. Programming

How to access argv[x] from another function other than main???

Hi friends, when I am passing arguments to main, I want another function to be able to have access to that function, the problem is that I am creating athread, which has a function like void *xyz(void *), how can pass the refernce of argv to this function, if you see my program, you will better... (2 Replies)
Discussion started by: gabam
2 Replies

6. Programming

unable to send a char parameter from main to a function

why does this not work? #include <stdio.h> #include <stdlib.h> char getFileMode(char charChanger) { char filetype; /*var to hold the value to be returned*/ filetype = charSetter; /*set filetype to "l" if it is a symlink*/ return filetype; } int main(void){ char... (8 Replies)
Discussion started by: bluetxxth
8 Replies

7. Shell Programming and Scripting

Help in separating variables declared in the main function

Hi! I've a C program as shown below.. The line numbers and the statements of the program are separated by a space.. 1 #include<stdio.h> 2 char a,b,c; 3 float x,y,z; 4 int main() 5 { 6 int d,e,f; 7 // further declarations 8 // further declarations 9 /* body*/ 10 } 11 void fun1() 12... (1 Reply)
Discussion started by: abk07
1 Replies

8. Programming

signal handling while in a function other than main

Hi, I have a main loop which calls a sub loop, which finally returns to the main loop itself. The main loop runs when a flag is set. Now, I have a signal handler for SIGINT, which resets the flag and thus stops the main loop. Suppose I send SIGINT while the program is in subloop, I get an error... (1 Reply)
Discussion started by: Theju
1 Replies

9. Programming

main function

Is it possible to execute any function before main() function in C or C++. (6 Replies)
Discussion started by: arun.viswanath
6 Replies

10. Programming

c++ calling main() function

i just finished a project for a c++ class that i wrote at home on my computer, compiled with gcc. when i brought the code into school it would not compile, it would complain that cannot call main() function. at school we use ancient borland c++ from 1995. anyway my program has 20 different... (3 Replies)
Discussion started by: norsk hedensk
3 Replies
Login or Register to Ask a Question