GETUDPREFIX(3)

💖 GETUDPREFIX 💖

okay bestie, so this one lives in the UNIDATA LIBRARY FUNCTIONS section of the manual, and it's genuinely the most low-effort slay in the whole library. like, it does one thing and it does it perfectly. no cap.

✨ NAME ✨

getudprefix — returns the installation prefix of Unidata software 🎀

🌸 SYNOPSIS 🌸

const char *getudprefix(void);

that's it. that's the whole function. no args, no drama. 💅

🦋 DESCRIPTION 🦋

so basically, this function hands you back the pathname of the directory that most Unidata-supported software gets installed off of. which means — iconically — you can call it while your program is running to help you build the pathnames you actually need. main character energy, fr fr.

for example, here's the vibe:

#include <string.h>
extern const char *getudprefix(void);
char              pathbuf[256];
...
    (void)strcat(strcpy(pathbuf, getudprefix()),
                  "/etc/udunits.dat");

and here's the receipts on where the value comes from — it checks these in order, first one that exists wins:

1. the value of the environment variable UDPREFIX, if it exists 💖
2. otherwise, the value of the environment variable UDHOME, if it exists 🫶
3. otherwise, the home directory of the user database entry returned by getuduser(), if it exists 🌈
4. otherwise, the empty string ("") is returned 💀

so yeah, it's giving "backup plan, backup plan, backup plan, shrug." 😭

🌟 ENVIRONMENT 🌟

• UDPREFIX — contains the pathname of the root of the installed, Unidata software. this is the first one it peeks at 👑
• UDHOME — contains the pathname of the home directory of the Unidata user. the runner-up 🥈

👀 SEE ALSO 👀

• getuduser(3).

and that's the whole page, bestie, you ate it. 🍓 this little legend was printed 126.10.12 and the source date is $Date: 2000/08/07 23:15:03 $ — a true vintage icon, honestly. go build some paths, you got this 💜✨