explain_fgetpos_or_die(3)

💖 explain_fgetpos_or_die — from the Library Functions Manual, bestie 💖

okay so real talk, this page is about explain_fgetpos_or_die(3), and honestly? it's giving "tiny helper that saves your whole debugging era." let's get into it 🎀

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✨ NAME ✨

explain_fgetpos_or_die — reposition a stream and report errors 💅

like, move the lil cursor in your stream, and if it goes wrong, scream about it properly instead of just... silently being broken. iconic behaviour tbh.

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🌸 SYNOPSIS 🌸

#include <libexplain/fgetpos.h>
void explain_fgetpos_or_die(FILE *fp, fpos_t *pos);
int explain_fgetpos_on_error(FILE *fp, fpos_t *pos);

two functions, two whole vibes. one is the "no thoughts head empty just exit" version, the other is the "ok bestie i'll tell you what happened and then hand the result back" version 🫶

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🦋 DESCRIPTION 🦋

so explain_fgetpos_or_die is the function you call when you want it to call the fgetpos(3) system call for you. and when it fails? oh it's not quiet about it — an explanation gets printed to stderr, and that explanation is obtained from the explain_fgetpos(3) function. and then, because it's dramatic, the process terminates by calling exit(EXIT_FAILURE). no cap. it's done. it's over. 💀

meanwhile explain_fgetpos_on_error is the chill sibling. it also calls the fgetpos(3) system call, and on failure it also prints an explanation to stderr (also obtained from the explain_fgetpos(3) function) — but it still returns to the caller. it doesn't end your whole program. respectful. mature. we love to see it ✨

now the parameters, because they matter:

• fp — the fp, exactly as to be passed to the fgetpos(3) system call. no tweaking, no remixing, pass it as-is.
• pos — the pos, exactly as to be passed to the fgetpos(3) system call. same deal, bestie. verbatim.

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💜 RETURN VALUE 💜

explain_fgetpos_or_die only returns on success — see fgetpos(3) for more information on that. but on failure? it prints an explanation and exits. it does not return. like, at all. don't write code that assumes it comes back. 🙈

explain_fgetpos_on_error always returns the value return by the wrapped fgetpos(3) system call. every time. that's the whole point of it. 🔥

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🌈 EXAMPLE 🌈

explain_fgetpos_or_die is intended to be used in a fashion similar to the following example:

explain_fgetpos_or_die(fp, pos);

that's it. that's the whole moment. chef's kiss 👑

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⭐ SEE ALSO ⭐

• fgetpos(3) — reposition a stream
• explain_fgetpos(3) — explain fgetpos(3) errors
• exit(2) — terminate the calling process

all three of these are your besties, go read them 💖

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🎀 COPYRIGHT 🎀

libexplain version 1.4 Copyright (C) 2010 Peter Miller

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and that's the whole page, bestie! 🌸 this was explain_fgetpos_or_die(3) from the Library Functions Manual, libexplain version 1.4, Copyright (C) 2010 Peter Miller. go reposition a stream responsibly, mwah 💅🦋✨