Recent questions tagged C

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c - "error LNK2019: unresolved external symbol" error in Visual Studio 2010

I'm trying to compile and run a C code that is using libsndfile library for sound files processing. I have ... Studio and I really need help! 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 replace multiple spaces with a single space?

Well I'm looking for a function that reduce multiple space characters ' ' in a string. For example for string s given : s= ... ("s+", " ", s); 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 - Cannot understand return value of sizeof()

I have this in my code: int x = 4; char* array = malloc(x*sizeof(char)); size_t arraysize = sizeof (array); ... Since 4*sizeof(char) = 4 * 1) 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 - winsock not supporting read/write

With a small test program (compiled with mingw on Linux), I noticed that one cannot use the read and ... (well, mingw) write implementation? 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 kmalloc allocation not virtually contiguous?

I found that kmalloc returns physically and virtually contiguous memory. I wrote some code to observe ... Physical address:1d5d09c00 1d5d09c64 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 merge two arrays having different values into one array?

Suppose you have one array a[]=1,2,4,6 and a second array b[]=3,5,7. The merged result should have ... without using functions from <string.h>. 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 - Get IP address of interface in Linux using pcap

Is there a way how to get an IP address of an interface in Linux using libpcap? I have found this, Get ... it gives you your network address. 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 - fclose()/pclose() may block on some file pointers

Calling fclose() here after dup()ing its file descriptor blocks until the child process has ended (presumably because ... or pclose() is used. 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 - About string length, terminating NUL, etc

I'm currently learning C and I'm confused with differences between char array and string, as well as how they work ... :) Thank you in advance! 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 - Windows console application - signal for closing event

In windows console application, one can catch pressing ctrl+c by using: #include <stdio.h> #include <signal.h> ... . Is there a way? 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 - Child process cannot read after the exiting of parent process

After forking and executing a child program by function execvp(), the parent process exit. However this cause ... read nothing and print nothing 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 header file not recognized in Visual Studio 2017 Linux Project

When including a Linux header file, ucontext.h in this case, in a Linux C++ Project on Visual Studio ... Cannot resolve field getcontext() } 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 - EVP Interface with AES-NI support

When using the OpenSSL crypto libraries in C/C++, does the EVP interface automatically support AES-NI hardware ... do the trick? Thanks! 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 - Using Designated Initializers with the Heap

One can use designated initializers as shown below (for "billy") without issue, but when the same initialization ... token *molly_ptr = { ^ See Question&Answers more detail:os...

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

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636 views

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c - less than comparison for void pointers

I want to compare two void pointers like this: void foo(void* p1, void* p2) { if (p1 < p2) { void ... the C standard where this is documented. See Question&Answers more detail:os...

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

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591 views

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c - Does MINLOC work for arrays beginning at index 0? (Fortran 90/95)

After using C for a while, I went back to Fortran and allocated the arrays in my code from index 0 to N ... confirm this or offer a workaround? 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 - nul terminating a int array

gcc 4.4.4 c89 I was just experimenting with a int array. And something just came to my mind. Can I nul terminate it. For ... %d ] ", *p++); } } 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 - Making a Cython wrapper around Python function

I have a C function which signature looks like this: typedef double (*func_t)(double*, int) int ... multiple Python functions simultaneously). 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 does GDB determine the address to break at when you do "break function-name"?

A simple example that demonstrates my issue: // test.c #include <stdio.h> int foo1(int i) { i = i * ... this offset by myself without using GDB? 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 - Dynamically allocate memory for Array of Structs

Here's what I'm trying to do: #include <stdio.h> #include <stdlib.h> struct myStruct { int myVar; } struct ... to recognize the struct at all. See Question&Answers more detail:os...

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

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327 views

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c - Compute the doubleword product (signed) of two words given the lower word product

In Hacker's delight there is an algorithm to calculate the double word product of two (signed) words. The ... worse that the original function. See Question&Answers more detail:os...

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

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466 views

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c - Convert integer from (pure) binary to BCD

I'm to stupid right now to solve this problem... I get a BCD number (every digit is an own 4Bit representation) ... get it in a simple C-Code See Question&Answers more detail:os...

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

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381 views

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c - Set static text color Win32

I am making a dll that controls a dialogue box. I like to get a certain area to have red text. This code does ... TRUE; } } return FALSE; } 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 - Portable way to check if a char* pointer is a null-terminated string

I have a C function that takes in a char* pointer. One of the function's preconditions is that the pointer ... to a null-terminated string. 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 raise a double value by power of 12?

I have a double which is: double mydouble = 10; and I want 10^12, so 10 * 10 * 10 * 10 * 10 * 10 * 10 ... ... I think pow isn't my friend right? 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 - Preprocessor: Concatenate string to each argument in __VA_ARGS__

I'd like to append a stringified macro argument to each element in a variadic macro. I think I know what I ... if someone could shed a light. See Question&Answers more detail:os...

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

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577 views

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c - Is clflush or clflushopt atomic when system crash？

Commonly, cacheline is 64B but atomicity of non-volatile memory is 8B. For example: x[1]=100; x[2]=100; clflush( ... ]=0, x[2]=100 after reboot？ See Question&Answers more detail:os...

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

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368 views

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c - What are the contents of the memory just allocated by `malloc()`?

I was curious about what exactly a pointer holds, after malloc() was used to allocate memory space? The manpage ... works it fits in here. See Question&Answers more detail:os...

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

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