al_fopen(3alleg5)

📦
version 5.2.11.3 · 4 versions
, in debian trixie, ubuntu questing, ubuntu resolute, ubuntu stonking

💖 al_fopen — the Allegro 5 API page, but make it a group chat 💖

okay bestie, sit down, hydrate, and let's talk about al_fopen from the Allegro 5 API. this one's a classic, it's giving "hello i would like to open a file" energy and honestly? we love her for it. 🎀

✨ SYNOPSIS ✨

#include <allegro5/allegro.h>

ALLEGRO_FILE *al_fopen(const char *path, const char *mode)

that's it. two little strings and she hands you back a file. iconic behavior honestly. 💅

🌸 DESCRIPTION 🌸

so what she does is: she creates and opens a file — could be a real one, could be a virtual one, she doesn't judge — and she does it using the path and the mode you give her. and listen, the current file interface is the one doing the opening. whoever's in charge of the file interface right now? that's who shows up to work. 🫶

🦋 Parameters (the tea you gotta hand her)

  • path — the path to the file you wanna open. where is it. point at it. 🎯
  • mode — the access mode you're opening it in ("r", "w", etc.). how do you want it. respectfully. 💀

😭 The text mode / newline situation (this is the part that eats people alive)

depending on the stream type and the mode string, files may get opened in "text" mode. and bestie, the way newlines are handled is particularly important. lowkey the main character of this whole manpage. 👑

for example!! using the default stdio-based streams on DOS and Windows platforms, where the native end-of-line terminators are CR+LF sequences, a call to al_fgetc(3alleg5) may return just one character (\n) where there were actually two bytes (CR+LF) chillin' in the file. and when you're writing out \n, two bytes get written instead. 🙈

also, as an aside, \n is not defined to be equal to LF either. so like. don't assume. just don't. 💀

🔥 text files vs binary files (the vibe check)

newline translations can be genuinely useful for text files. slay. but for binary files? it is disastrous. catastrophic. not the vibe. no cap. 😭

so to avoid this behavior entirely, you need to open file streams in binary mode by using a mode argument that contains a "b" — for example "rb", "wb". put the b in there. she needs the b. periodt. ✨

⭐ Return value

she returns a file handle on success, or NULL on error. that's the whole story, bestie. check for the NULL. always check for the NULL. 🫶

💜 SEE ALSO 💜

and that's the page!! this came to you straight from the Allegro reference manual, where al_fopen(3alleg5) lives rent free. mwah, go open some files responsibly, ily, bye 👑💖✨

📦 where this page comes from