Hello everyone. I'm in the middle of working with a custom vector data structure in C. I want to achieve some small level of generics without using macros and settled on letting the vector be a contiguous array of uintptr_t's. If the user wants to fill it with types that are less than the size of a uintptr_t, then great, they can just cast their data and send it in. Anything bigger and they will need to send in pointers to their data along with a custom destructor. I decided to do this so that the user of the vector can handle simple use cases like just a stack of numbers and at the same time ..read more

I would like my application to be able to read the encoding of a given file similar to file -i command. I merely need to pass on that information, no charset specific processing required on my end. How could I implement such a feature? Within my use-case any information provided by the file command is assumed to be correct. submitted by /u/Mythologicalism [visit reddit] [comments ..read more

So I guess Microsoft decided to release the source for MS-DOS v4. So of course I was curious, as I like looking at very old C code. Theirs is a little confusing though... https://github.com/microsoft/MS-DOS/blob/main/v4.0/src/INC/CDS.C I've never seen this way of writing a function. It appears they write the function as it would be called, but then specify the types of its arguments. Like... return-type func(arg1, arg2) int arg1; struct struct-type *arg2; {...function code...} I feel like I recall having read somewhere before that it used to have to be done like that until they switched it to ..read more

Generic Linked List submitted by /u/Exotic-End-4670 [visit reddit] [comments ..read more

Ive done some C during my yet short life, i think this lang is very interesting and i find it really fun because the only times ive had to deal with it was during some fun side experiments/projects i did on my own. I want to improve during my free time and become what could be qualified as a "good c programmer" in the future, so i wanted what more experimented C guys would recommend as a good path, im open to anything, projects idea/book recommendations etc. (ps: what high performance c is to me rn is the firedancer solana client which ive read a lot of blogs about and i find the architecture ..read more

So I have defined the following function: void render_text(char *text, float scale) { printf("Scale: %0.6f\n",scale); //... //Some random code } Somewhere else, I call the function like this: render_text("Hola que tal\0",0.7f); And this is the output: Scale: 36893488147419103232.000000 I have tried random numbers, and they transform into either 0.000000, -2.000000, -36893488147419103232.000000 or 36893488147419103232.000000. All I know is: This function is defined one time in a single file. The definition in it's header is correct. There is a single call in the entire code of this functio ..read more

Hi, I am currently reading through The C Programming Language by K&R. Currently, I'm not quite understanding the following phrase from the book: "In many environments, a file may be substituted for the keyboard by using the < convention for input redirection; if a program prog uses getchar, then the command line prog <infile causes prog to read characters from infile instead." So, can someone please give me some more information on what < means? It says it's for input redirection, but I'm having trouble drawing a mental picture of how that works. Also, is it part of C or the comm ..read more

I'm implementing type-qualifiers in my C compiler and there seem to be different rules when it comes to assignment which are somehow conflicting or are implemented differently. In the c99 for scalar initialization it says: the same type constraints and conversions as for simple assignment apply, taking the type of the scalar to be the unqualified version of its declared type which sounds like type-qualifiers can be ignored when doing initialization, which isn't the case though with gcc/clang. Another thing that the standard says when defining rules for valid assignments is that two types ar ..read more

So im still quite a beginner in this lanuage. I have made small C projects and generally understand the basics. But something i stumbled upon recently that i really never thought about before is character encoding. Its something i never was introduced to and something that (at least how i percieve it) feels like a pain to deal with. I even got a little dissapointed that id never heard about it before but then again its just something ill have to learn about. So my few questions i got here is: How much will i have to deal with encoding / decoding? Are there any types of programs that totally n ..read more

So I am doing a project and I have a DHT sensor that is getting the values for temperature and humidity. I want these values to be sent in a single byte of a communications message, I already have the commutations message and the variable is txDHT which is automatically sent to rxDHT at the end of each communications loop, however I need txDHT/rxDHT to be no more than a byte. Im aware you can shift bits in a byte and then put the other value next to it but I don’t know how to do this without it being bigger than a byte. Is there a way I can do this or will I have to do separate variables for ..read more