explain_ungetc_or_die(3)

💖 explain_ungetc_or_die — Library Functions Manual 💖

okay bestie, sit down, we're learning about explain_ungetc_or_die(3) from the library functions manual and honestly? it's giving "safety net for your stream pushes" and I'm obsessed. 🫶

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✨ NAME ✨

explain_ungetc_or_die — push a character back to a stream and report errors 💅

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🌸 SYNOPSIS 🌸

#include <libexplain/ungetc.h>
void explain_ungetc_or_die(int c, FILE *fp);
int explain_ungetc_on_error(int c, FILE *fp);

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🦋 DESCRIPTION 🦋

So here's the tea. explain_ungetc_or_die is the function you call when you wanna invoke the ungetc(3) system call, but with ✨consequences✨. If it fails, an explanation gets printed to stderr — and that explanation comes from the explain_ungetc(3) function, no cap — and then the process literally terminates by calling exit(EXIT_FAILURE). like, it's over over. 😭

Then you've got explain_ungetc_on_error, which is the chill sibling. It also calls the ungetc(3) system call, and on failure it also prints an explanation to stderr obtained from explain_ungetc(3), but instead of ending it all, it still returns to the caller. very demure, very mindful. 🧚

• c — the c, exactly as to be passed to the ungetc(3) system call. yes, exactly. don't get creative with it. 🙈
• fp — the fp, exactly as to be passed to the ungetc(3) system call. same energy, same rule. 💜

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👑 RETURN VALUE 👑

explain_ungetc_or_die only returns on success — see ungetc(3) for more info. On failure? It prints an explanation and exits. It does not return. periodt. 💀

explain_ungetc_on_error always returns the value returned by the wrapped ungetc(3) system call. always. it's reliable like that. 🎀

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🌈 EXAMPLE 🌈

The explain_ungetc_or_die function is intended to be used in a fashion similar to the following example:

explain_ungetc_or_die(c, fp);

that's it, that's the whole vibe. iconic honestly. ⭐

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🔥 SEE ALSO 🔥

• ungetc(3) — push a character back to a stream
• explain_ungetc(3) — explain ungetc(3) errors
• exit(2) — terminate the calling process

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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_ungetc_or_die(3) from the Library Functions Manual, brought to you by libexplain version 1.4, copyright (C) 2010 Peter Miller, dated way back in 2010 — she's vintage, she's classic, she's still slaying. mwah. 💅🌸