Programming :: Copying Unsigned Char To Uint64_t?
Oct 17, 2010
I am a dummy in C programming. I have a problem with copying the array of 64 elements of unsigned char to array of 8 element of uint64_t. For example:
unsigned char p[64]
uint64_t Data[8];
memcpy (&Data, &p, 64);
I am not sure if it is right. Please help me. Thanks a lot.Moreover, do both p and Data have 64 bytes?
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Feb 14, 2011
i define variable of type char (range -128 to 127). when i tried to print the value after assigning a -ve value to it it displaying a +ve value of that -ve value(256+value).
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Mar 4, 2010
is it possible to convert a variable from char * to unsigned char ?
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Mar 4, 2010
m getting the following error when trying to compile:Quote:
$ make
g++ -march=athlon64 -O2 -pipe -fomit-frame-pointer -msse3 -c -D_GNU_SOURCE -DPLUGIN_NAME_I18N='"undelete"' -DHAVE_SVDRP -I../../../include undelete.c
[code]...
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Nov 4, 2010
Programming in C.I have two char arrays.char buf1[1024];char buf2[1024];Aren't buf1 and buf2 also pointers?I read in 1024 bytes into buf1 which contain about 300 bytes of characters with newlines. The data is basically a few English sentences. I'm trying to scan buf1 for newlines and then stop at the 1st newline and copy the rest of the data from that 1st newline into buf2.So I run a for loop to look for that new line.
Code:
for(i=0; i<1024;i++) {
if((strcmp(&buf1[i], "
[code]...
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Jul 9, 2010
I am having trouble with the following exception class.
Code:
/**Standard Exception
*
*@description
*@update
*@changes
[code]....
Line 43 points at the snprintf() command.I think the error has to do with the function being virtual and the const after the function definition, however although I have been looking really hard I have not being able to find the reason nor the solution to the problem.
One workaround that I know is moving the block of source withing the virtual function, in the constructor, however having read around (boost library exceptions tutorials) it specifically said that formating of errors messages should not take place withing the construction of objects because we are risking throwing an exceptions and messing up the flow order.
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Jul 5, 2011
With this I may remove the last emtpy char which is not visible, coming from net, windows, ...
Code:
echo "$mystringwindowsorotherwithemptylastchar" |sed s/.$//
However if there are not then it makes a problem and delete effectively an existing char.
Code:
echo "klklj" |sed s/.$//
klkl
Anyone would have a solution for SH?
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Jul 7, 2011
I'm having a hard time trying to get the number of digits in a uint64_t variable. The reason I'm using this is I want to make sure I get x amount of digits inside of a variable before I use it, but since the higher the digits, the better the program is.I currently use the following code, and it works, but my loop will never exit because the length is always 0:
Code:
/**
* numbdigits()
* number: The number to evaluate [in]
*
* Returns the number of digits found in a number.
[code]....
getrand() returns a uint64_t as well (and works). The only way the while() loop ends without my intervention is if I do curd += numdigits(val) instead...but, that gives a false value as well.
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May 29, 2010
I've never programed shell scripting.
Code goes like so:
I simply want to read a file "data.txt" line by line Then char by char and add them into a result var. The file is supossed to always contain numeric values
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Mar 24, 2009
From what I understand, if I attempt to increment an unsigned int which is already at its max value, it will flip back to zero.Question: is this guaranteed to happen by the C language? That is, can I count on this happening on all platforms?(Of course, I recognize that the max value of the int will change from platform to platform...)
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Jan 8, 2010
I am trying to create a table T having a field F which should be able to store variable-length sequences of "unsigned" characters (8bit values ranging from 0 to 255 (not including 0, including 255)).(MAX_LENGTH) is not working, as it seems to want sequences of 8bit values ranging from 0 to 127 (thus "signed" characters).Can anyone help me by pointing out if there is a type suited for my needs (or if such a type does not exist)?For those familiar to C programming and working with the MySQL client library, I should be able to (successfully) do something along the lines of:
Code:
unsigned char value[] = { 'H', 'E', 'L', 'L', 'O', -1, -128, 'W', 'O', 'R', 'L', 'D' };
unsigned char query[255];
[code]....
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Feb 20, 2011
I'm writing a tridiagonal solver for sparse linear systems and I coded this decreasing loop:
PHP Code:
xx[NN - 1] = gamma[NN - 1]*BB[NN - 1];
ii = NN - 2;
/* Compute the x values: */
while (ii >= 0) {
xx[ii] = gamma[ii]*(BB[ii] + xx[ii + 1]);
ii = ii - 1;
}
now... if ii is declared as an unsigned integer, the code gives me a segmentation fault, but if I declare it as an int, it doesn't. Using DDD I noticed that, as an unsigned int variable, when I finally decrease it, it underflows and blows up to a huge value, ergo giving me an unaccesible direction for xx in the following iteration! I taugh me not to use unsigned int variables for dereasing loops! XD
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Jul 21, 2011
I copied and test a simple random number generate program
#include <algorithm>
#include <vector>
#include <iterator>
#include <iostream>
[code]....
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Apr 7, 2010
I am accessing a firewire camera using the libdc1394 library and saving the image as a PPM file, using the code below:
[Code].....
My question is whether the above code is portable. I presume it is, since the result is a binary PPM file which should be capable of being read across multiple computers with different architectures and different operating systems. But at the same time, all that the above code is doing is just saving the binary representation of unsigned chars on the harddrive, and there does not seem to be any reason why the binary representations of the unsigned chars will be identical across multiple computers.
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Jan 6, 2010
I've modified a program to show * instead of letters when typing a password. I'm trying to make it so that when pressing backspace a * will be removed.Here's a rough example. The problem is that when trying to do this in the real program,' is not recognized as backspace.
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Jul 16, 2011
I'm writing the Diffie-Hellman key exchange system using GMP to handle big integers. For the most part, everything works. I can convert the string to mpz_t, set up the keys and everything, and encrypt it fine. Its the decrypting I'm having issues with. What I'm using is mpz_xor() for both. To encrypt I'm doing mpz_xor(buffer, mpz_of_text, secret_key), and to decrypt I'm doing mpz_xor(buffer, mpz_of_cipher, secret_key).
For one character, it semi-works...it'll decrypt it fine, but it'll return it as it's ASCII value (i.e.: if I encrypt "A", it'll decrypt it as 65). Which, I can easily just do sprintf(decrypted_buffer, "%c", 65) for example and be fine. But, when I'm sending text bigger than one character, the encryption for AB gives me something like 1061043 after running the decrypting xor on it.
Has anyone ever done this before or can point me in some directions? Perhaps other algorithms to try? I know XOR isn't the most secure encryption method to use, but at the time I wasn't sure what else to use. I'm really just having a hard time trying to convert a mpz_t to a character string. I've looked at mpz_get_str() and it works before running encryption (i.e.: using mpz_set_str() to create a mpz of a string, then calling mpz_get_str() to change it back). Maybe my XOR method is wrong? Here's the code I'm using:
Code:
/**
* str2mpz()
* b The current buffer of text to convert [in]
* m The mpz_t variable to store converted text [out]
[code]....
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Jan 27, 2011
I have a char*[] array:
Code:
char* myarray[] = {"Hello", "there!", "LQ"};
and I wish to use/ write a function to find the number of elements in myarray (in this case, its 3).
*equivalent of .NET's array.size() that returns number of elements in array
How do I achieve it?
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Apr 26, 2010
Below I've presented the declaration, definition and the calling method of a function w.r.t pass by reference:
Declaration
Code:
void getUnpackedMsg (unsigned char &data, unsigned int numberOfBits);
Definition
line 278: Shown in RED
Code:
void packedMessage :: getUnpackedMsg (unsigned char &emptyArray, unsigned int numberOfBits)
{
...
...
printf ("
[code].....
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Jul 18, 2010
What could be a command to erase from the cursor up to the first non-blank char in vi (or vim)?
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Jun 19, 2010
I am trying to simulate a shell. So what I do is checking of having the parameters from standard input, suc as "/bin/ls -l /home/france/Documents", and then passing them to function execute, which at some point calls execvp(argv[0],argv)The problem is that I don't succeed in using these arguments, while if I call execvp(paramList[0],paramList) it works!!!! Where paramList is exactly what I would put on standard input, but defined statically.
Code:
#include<unistd.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
[code].....
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Mar 6, 2011
This works for "char" but i need "char*",how do I do it?
Code:
char* tk = (char*) calloc(ctk+1,sizeof(char*));
Error when I use it:
Code:
error: invalid conversion from har* to har
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Mar 19, 2010
I would like to create a small C tool. I encounter a problem of how to make a function to check an input chars contains numbers (started from the second element).
Some samples:
char *mychar= "a3547"; (The result of function checking this is true)
char *another_char = "t6548"; (The result of function checking this is true)
char *next_char = "appl3"; (The result of function checking this is false)
char *new_char = "b1aa3"; (The result of function checking this is false)
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Jul 15, 2010
Can anyone please suggest me how can we convert a wide char data in linux which is of 32 bit to a 16bit data. I have a file which has 16bit binary data? Could any one please give me ideas.
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Jan 19, 2010
How to remove alternate char from file using shell script? If the file content is "1234567890" the output file should be "24680".
sed 's/(.)(.)/2/g' filename
Now there may be small modification to generate two alternate byte, what it should be? If the file content is "1234567890" the output file should be "125689".
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Sep 1, 2009
I have the following path wher i want to replace forward slashes with back slashes using sed path=/temp/file.tar
I am using the following but it's not working.
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Jun 9, 2010
I'm writing a code to get the index of the last occurrence of a given substring in a string.
Code:
int StringHandler::lastIndexOf(string src, const string s) {
unsigned int lastIndex = string::npos;
if (src.find(s, 0) == string::npos) {
return -1; } else {
bool isLast = false; unsigned int i = 0; do {
lastIndex = src.find(s, i);
if (lastIndex != string::npos) { i = lastIndex + 1;
if (i == src.size()) { isLast = true;
} } else { isLast = true;
} } while (!isLast);
} return lastIndex;
}
My problem is: execution steps into an if with a false condition! Check the values of i and src.size() at the right panel. How could be possible for the program to run the highlighted statement? The if condition above is false! [URL]. I could use char arrays, for example, but this kind of false validation has happened to me more than once, I'm using G++ 4.5 with these flags: -O0 -g -Wall -c
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Jan 23, 2010
I've got a strange bug that I cannot figure out how to solve. Here is the function.
Code:
int getnexttab(char input[], int index, int length)
{
[code]....
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May 13, 2009
Please look at the comments
Code:
/*
* TEST CASE TO CHECK DIFFERENCES BETWEEN STRING AS
[code]...
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Jan 27, 2011
I have the following char* array
Code:
char* chrarray[] = {"Hello","LinuxQuestions"};
and I need to pass it into a function, how should I define my function in the header file?
[code]....
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Nov 6, 2010
Program in CSay I have a char array of 1024 bytes called buf1.But I only want to print the chars in index 0 up to index 30. I know I could do this with a for loop. But is there any other way? What about maybe storing from 31-1024 to another char array say buf2 with strcpy and somehow popping 31+ out of the buf1 char array?
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