Recent questions tagged C

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c - undefined reference to function declared in *.h file

I am a unskilled programmer and new to linux, I run into a problem when complining. I have two files ' ... better to follow the old one) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Static library link issue with Mac OS X: symbol(s) not found for architecture x86_64

I'm trying to generate a static library and link it with an execution binary. This is a library function: ... posix What might be wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - GDB: Automatic 'Next'ing?

Quick one this time. Is it possible (other than pressing enter forever) for gdb to continually next through a ... from nexting over and over. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What are the real benefits of flexible array member?

After reading some posts related to flexible array member, I am still not fully understand why we need such a feature. ... point it out for me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Copy a function in memory and execute it

I would like to know how in C in can copy the content of a function into memory and the execute it? I'm ... "%i",val); Thanks for your answers See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Getting the pixel value of BMP file

i got a question for reading an bmp image. How can i get the pixel value(R, G, B values) in an bmp ... help me using the C programming language? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Four in a row logic

I'm currently working on a basic four in a row game for myself, but I'm rather stuck at the logic behind ... I do this for diagonal lines? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - GCC libm not working

I have a c program that calls sin, cos, and acos. When I compile I get the following errors: /tmp/ ... found. What could be causing this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How do I use getch from curses without clearing the screen?

I'm learning to program in C and want to be able to type characters into the terminal while my code is ... and gnome-terminal if that helps. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Linux Kernel's __is_constexpr Macro

How does the __is_constexpr(x) macro of the Linux Kernel work? What is its purpose? When was it ... Integer Constant Expressions in Macros See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to use kgdb on ARM??

Im using ARMv7 as a target machine. I have compiled the Linux source 2.6.34.13 for target. Target is connected ... . Guide me in this regards. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is it possible (and safe) to make an accepting socket non-blocking?

I'm looking for a way to interrupt an accept() call on a blocking socket. Using signals is not an option, as ... FONBIO), I'm also interested. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Can bitwise operators have undefined behavior?

Bitwise operators (~, &, | and ^) operate on the bitwise representation of their promoted operands. Can ... for more common architectures? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - how many times will strlen() be called in this for loop?

Will the strlen() function below get called just once (with the value stored for further comparisons); or is it going to ... { /* do stuff */ } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Multiple definition and header-only libraries

I have a C program with several c and h files. I decided to make one part of the program 'header-only' so ... no idea how to solve this problem. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - void * arithmetic

#include<stdio.h> int main(int argc,char *argv[]) { int i=10; void *k; k=&i; k++; printf("%p %p ",&i, ... GCC doesn't complain at least in k++. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to find the size of a variable without using sizeof

Let us assume I have declared the variable 'i' of certain datatype (might be int, char, float or double) ... 'i' without sizeof operator? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - When/why is it a bad idea to use the fscanf() function?

In an answer there was an interesting statement: "It's almost always a bad idea to use the fscanf() function as ... sscanf() to read some file? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why can't arrays of same type and size be assigned?

If I declare two arrays - arr1 and arr2 - of, say, type int of size 10 each, and initialize first array, ... is that not the case with arrays? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to distinguish between Escape and Escape Sequence

My end goal is to distinguish between my pressing Esc (ASCII 27) on my keyboard, and me pressing the → key ... key standalone 27 91 67 120 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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523 views

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c - How strcpy works behind the scenes?

This may be a very basic question for some. I was trying to understand how strcpy works actually behind the ... . Hows that working actually? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

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c - Understanding engine initialization in OpenSSL

I'm trying to set up a basic test of HMAC-SHA-256 hashing but I'm having problems with the engine setup. ... ; ENGINE_finish(e); ENGINE_free(e); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - can realloc move pointer if new size smaller?

I am wondering whether the C or C++ standard guarantees that a pointer is not changed when realloc is called with ... , and somehow move ptr2 ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to get instruction information from libopcodes?

I am writing a tool which uses libbfd and libopcodes in x86-32 and x86-64 Linux to perform disassembly. ... filling in this information myself. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Sprintf Segmentation Fault

numCheck is number between 1-1000. This code gives me a segfault only when I collect the results of sprintf in ... (numString, "%d", numCheck); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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508 views

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c - How does one do Raw IO on Mac OS X? (ie. equivalent to Linux's O_DIRECT flag)

I having been googling for a way to do raw (sometimes called direct) i/o under mac os. Raw i/o turns ... buffering under mac os? Cheers Tim See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Catching stack overflow

What's the best way to catch stack overflow in C? More specifically: A C program contains an interpreter for a ... ; how does it implement this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Getting source from object file

Is there any way to get the source code by using object file in C? For example I have a source code simple. ... get the source? code of simple.c See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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