408,012 questions
0
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Encountering an issue in SASM XMM0
The following is my SASM x86-64 code:
section .data
promptInput db "Enter two doubles: ", 10, 0
scanformat db "%lf", 0
printOpeOne db "OperandOne: %lf", 10, 0
...
- 1
-2
votes
0
answers
47
views
Additional sources files in CMake project compile, but their functions are not executed [closed]
The goal is to modify a Zephyr example project by adding in my own source files. The paths to the source files are added to the project CMakeLists.txt file as so:
target_sources(app PRIVATE src/main....
-4
votes
2
answers
113
views
Array reassignment in while loop condition [closed]
I had a question on my recent exam about array values reassignment in while loop condition.
Q: What is the value of array a after program execution?
Code:
boolean a[] = {true, false,true,false};
...
- 15
4
votes
2
answers
38
views
Lex Setup Correctly Validating Assignments but not Expressions
I recently revisited an old assignment that I did not get to work and I am still curious as to why it isn't.
This assignment was to create a lex regular expression in C that would validate both ...
- 433
2
votes
0
answers
65
views
Linux: Low-level management of virtual memory - collaboration between processes
If I were to mmap() a very large file (for read-only access) pages would be read-in, by the kernel, after a page fault indicates that the page is not already cached in RAM. Pages will remain cached ...
- 2,056
2
votes
1
answer
69
views
How to wrap an already weak function?
Say I have a lib provided by a HAL that defines weak IRQHandlers, and builds an interrupt table (in this MRE, a single function ptr g_IRQHANDLER):
// lib.c
#include <stdio.h>
void IRQHandler(...
- 995
4
votes
2
answers
122
views
Differentiating pointer declaration and multiplicative expression
According to the C language grammar defined in the standard, how will the statement a * b; be parsed?
Is it considered as a declaration of a pointer b to an object of type a? Or is it considered as an ...
- 406
1
vote
3
answers
70
views
How do I update an address with a constant minus an address in a circular buffer
I have pointer into a delay line that I wish to update.
If the pointer (p) goes past the end of the buffer, I wish to wrap around to the start plus some value.
_Complex float buffer[BUF_LEN];
...
- 21
2
votes
2
answers
102
views
Why does my function replace my letters with weird characters?
I'm a student and I'm currently learning C basis.
My goal is to "recreate" the strcat() function without librairies
Here is what I tried:
#include <stdio.h>
char *ft_strcat(char *...
- 41
2
votes
0
answers
70
views
C++'s virtual methods implementation in C [duplicate]
In C++, I can create an array of pointers to a base class and call overridden methods, my goal is to mimic this type of behavior:
Animal* zoo[3];
zoo[0] = new Cat("Whiskers");
zoo[1] = new ...
- 35
0
votes
0
answers
42
views
What is the best way to listen to battery events (charger plugged in, percentage change) in linux? [closed]
I want to blockingly listen to battery events. Why not poll the sysfs? Firstly, sysfs doesn't notify of any events; only some specific types of interfaces, if any at all, have the ability to be ...
- 59
2
votes
3
answers
129
views
how to force compiler error with strcpy() when destination is const
How can I make the strcpy() function trigger a compiler error when the destination is a const pointer?
The prototype is strcpy(char *dest, const char *src) however if I specify a const char * for ...
- 17.8k
2
votes
0
answers
30
views
Why I can't create a pixmap from the PDF page after reading and dropping resources (muPDF, C)?
My program written in C with muPDF reads a page from PDF-file (1 page = 1 image, no text on the page) and creates a pixmap from the page.
It works well.
But if I read resources before creating pixmap ...
- 307
-4
votes
0
answers
67
views
C compilation issue on Linux [closed]
We have moved from HP-UX to Linux and hence need to recompile the C code. I am getting an error usr/bin/ld: can not find -lcl
Can you where we can find this library and why it is missing on Linux.
...
1
vote
3
answers
134
views
Inputting to a cstring of undefined size without wasting memory
I know beginner level C++. In C++ when I want to, for example. input the user's name, all I need to dos is:
getline(cin,str);
but I am trying to learn C.( I want to play with kernels and embedded ...
