Recent questions tagged c

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I have successfully installed MinGW on a Windows 7 32bit machine, and have tried to compile a simple program ... , fprintf, snprintf, sprintf. 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 the input and output strings to sprintf() be the same?

I have used this type of convention many times in my code in the past: strcpy ( cTmpA, "hello" ); sprintf ... call to sprintf() has occurred? 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 - Finding length of char array

I have some code as follows: int i=0; char a[7]={0x00,0xdc,0x01,0x04}; int len=0; len = sizeof(a); printf( ... a in c? How can this be done? 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 - GetThemeStream usage

I'm very confused with GetThemeStream function HRESULT GetThemeStream( _In_ HTHEME hTheme, _In_ int iPartId, _In_ ... incorrect send parameter? 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 - Char * (pointer) function

I need to pass in a char * in a function and have it set to a cstring value. I can properly set it as a ... printf("%s",chunk); // prints 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 - How Do I Use Labels In GCC Inline Assembly?

I'm trying to learn x86-64 inline assembly and decided to implement this very simple swap method that simply ... note.GNU-stack,"",@progbits 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 - Does the program execution always start from main in C?

Must program execution start from main, or can the starting address be modified? #include <stdio.h> void fun(); ... in fun before in main. 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 modify packet header(IP header, TCP Header) before the host send them into the network

I want to modify packet header(IP header, TCP Header) before the host send them into the network. For example, ... working with linux c 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 - Radix Sort Optimization

I was trying to optimize the Radix Sort code, because I felt there was room for it as traditional codes in books ... return Temp; } return A; } 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 - Disabling ASLR in Mac OS X Snow Leopard

Essentially I want to disable ASLR in Mac OS X Snow Leopard and use gcc todo some buffer overflowing and stack ... know how to disable ASLR? 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 - State Machine with no function pointer

I have implemented a complex state machine with numerous state transitions for a safety SIL 4 system. The ... without any function pointers? 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 - Keyboard input on OSX

I was wondering if it was possible to read the keyboards input, on OSx from somewhere, such as GNU/Linux with the ... i could call in C. 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 - Malloc Memory Questions

First of all I noticed when I malloc memory vs. calloc the memory footprint is different. I am working with datasets of ... [i]=i; sleep(15); 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 - validating X.509 certificate on linux

I have just started working with X.509 certificates. Can any one tell me how to go about validating a ... to launch command line utilities. 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 - Reading in a string of unknown length from the console

If I want to read in a string of arbitrary length from the command line, what's the best way of going ... something? Any hints would be great. 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 select() for non-blocking sockets to connect always returns 1

This question is very similar (or almost identical) to In a non blocking socket connect, select() always returns 1; ... out of loop break; } 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 - Rationale for pointer comparisons outside an array to be UB

So, the standard (referring to N1570) says the following about comparing pointers: C99 6.5.8/5 Relational operators ... operator does or not.) 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 - Caesar's Cipher Code

#include <stdio.h> void caesar (char cipher[], int shift); int main () { char cipher[50]; int shift; printf ... <= which is actually 3 shifts. 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 - C99 referring to inline function: undefined reference to XXX and why should I put it to header?

Does gcc completely conform to the inline model specified in C99 standard? I've browsed some info about this ... __func, with internal linkage. 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 size of the data of a Pointer

I tried the following code in order to see how to get size of the data of a pointer: #include <stdio ... or dynamically memory allocated array. 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 perform uint32/float conversion with SSE?

In SSE there is a function _mm_cvtepi32_ps(__m128i input) which takes input vector of 32 bits wide ... 11001110 11011000 01010111 10000010 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 - Understanding gcc 4.9.2 auto-vectorization output

I am trying to learn gcc auto-vectorization module. After reading documentation from here. Here is what I tried ( ... gcc -dumpversion 4.9.2 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 - Reading values from CSV file into variables

I am trying to write a simple piece of code to read values from a CSV file with a max of 100 entries into ... int sal; int deleted; } Employee; 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 calls to send() are merged into one call to recv()

I have a client-server application. The client is sending a string followed by an integer using two distinct send() ... What am I doing 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 - Convert float to string without sprintf()

I'm coding for a microcontroller-based application and I need to convert a float to a character string, but I ... need 2 digits of precision. 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 - File read write to same file?

I've managed to open a file and read while writing to another file with var=fopen(file,"r") / "w" but even ... want to change the char or not? 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 - pthread_cond_wait for 2 threads

I'm trying to implement pthread_cond_wait for 2 threads. My test code is trying to use two threads to preform the ... c -o timeTest -lpthread") 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 - GTK Modifying Background Color of GtkButton

Trying to change background/foreground color....Using Gtk+ and C. GdkColor color; gdk_color_parse( "#0080FF", ... anybody provide some examples? See Question&Answers more detail:os...

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

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