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Questions tagged [c-libraries]

63 questions
17
votes
3 answers

Is the %zu specifier required for printf?

We are using C89 on an embedded platform. I attempted to print out a size_t, but it did not work: #include int main(void) { size_t n = 123; printf("%zu\n",n); return 0; } Instead of 123, I got zu. Other specifiers work…
Trevor Hickey
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16
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3 answers

Is there a performance degradation / penalty in using pure C library in C++ code?

I saw this link but I'm not asking for a performance degradation for code using "extern". I mean without "extern", is there "context switching" when using C library in C++? Are there any problems when using pure C (not class-wrapped) functions in…
John Doe
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10
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1 answer

Why is the Postgres C library called libpq instead of libpg?

Everything in the Postgres world has common abbreviation pg, and it seems more logical to call Postgres' c-library libpg, rather than libpq. Why is it called libpq? Is libpg already taken by another tool?
Alexander Myshov
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8
votes
4 answers

Variant datatype library for C

Is there a decent open-source C library for storing and manipulating dynamically-typed variables (a.k.a. variants)? I'm primarily interested in atomic values (int8, int16, int32, uint, strings, blobs, etc.), while JSON-style arrays and objects as…
Joey Adams
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8
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3 answers

error while loading shared libraries: libgomp.so.1: , wrong GCC version?

While executing a 3rd party c++ program I get the following error: error while loading shared libraries: libgomp.so.1: cannot open shared object file: No such file or directory The libgomp.so.1 library is the GNU compiler collection OpenMP runtime…
WillamS
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4
votes
4 answers

C or C++ library for encoding and decoding websocket frames

I have my own socket implementation that supports connection from regular tcp client. Now I would like to add websocket support in my server program. In that case I will need to support handshaking and message framing protocols that are supported by…
all_by_grace
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4
votes
0 answers

Clear steps for importing a native C library in Kotlin using CLion

I am trying out Kotlin Native and it seems to work. But the page giving instruction on adding a C library is not clear enough. For example lets say I wanted to import libcurl and libxml for making a webscraper. Or say wanted to make GUIs by using…
Kotlinboy
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4
votes
1 answer

Can I just include the C libraries when programming an operating system (since they are made in C)

I'm trying to make an operating system for the Raspberry Pi (nothing big, just for fun) and though I could write it all in Assembly, that would be much harder than writing it in C. I'm wondering if (and why not if I can't) I could just include the C…
Dallin Christensen
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4
votes
2 answers

Runtime typechecking for pointers

I want to know how scanf function is implemented. (Just for fun of course) Number of arguments is variable, so it's certainly implemented by va_list, va_arg macros. It also throws some warnings, when number of arguments does not match with format…
sorush-r
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3
votes
1 answer

Load file to NSData with C

Problem is to load image file to UIImage. Original file cashed in file system and managed by C-library (question about it). With objective-C I can do so: NSData *file = [NSData dataWithContentsOfFile:...]; [UIImage imageWithData:file]; But how it…
Gusev Andrey
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3
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1 answer

Link Go against a static 32 bit 3rd party library

I am using the flags below #cgo CFLAGS: -I. #cgo LDFLAGS: -L. -lcluto #include #include "cluto.h" and when I compile with go build clutod.go The compiler fails with error /usr/bin/ld: pulando…
vuco
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2
votes
4 answers

Is there a function in C which checks whether a character is a character or integer, etc?

I have a a homework, and my professor said some of the students figured out that they could check whether the characters they read in are specific ones using a function. He said it was in the string.h library, but I checked and I don't see it. Can…
Andy
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2
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1 answer

getopt_long() function with custom argc and argv

I am having trouble using getopt_long() function with custom argc and argv. I receive my arguments in a string instead of the real command line args. Then a new_argc and new_argv was built from this string to be used with getopt_long(). But…
n00pster
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2
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1 answer

API to capture thread's CPU time

I want to measure the CPU time, not elapsed time on a thread. For example, if a thread is waiting or sleeping, it shouldn't count as CPU time because the thread is not in runnable state. So I got the following link to get CPU time. However, it seems…
Kenneth
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2
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1 answer

Languages that make system calls directly

I have been learning about system calls in linux and how the GNU C library functions are really just wrappers that end up calling the actual system calls. I have also read that a lot/a few other languages don't actually make their own system calls…
user8396910
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