explain_vfprintf_or_die(3)

✨ explain_vfprintf_or_die ✨

okay bestie, welcome to the explain_vfprintf_or_die(3) page from the Library Functions Manual 💖 this is the one where vfprintf stops ghosting you and actually tells you what went wrong. no cap.

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🌸 NAME 🌸

explain_vfprintf_or_die — formatted output conversion and report errors 🎀

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🦋 SYNOPSIS 🦋

#include <libexplain/vfprintf.h>
void explain_vfprintf_or_die(FILE *fp, const char *format, va_list ap);
int explain_vfprintf_on_error(FILE *fp, const char *format, va_list ap);

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💅 DESCRIPTION 💅

so. the explain_vfprintf_or_die function is literally just here to call the vfprintf(3) system call for you. and the moment it fails? it prints an explanation to stderr, which it got from the explain_vfprintf(3) function, and then it ends the whole process by calling exit(EXIT_FAILURE). dramatic? yes. effective? also yes. 💀

the explain_vfprintf_on_error function is the chill sibling — it also calls the vfprintf(3) system call, and on failure it also prints an explanation to stderr from the explain_vfprintf(3) function, but then it still returns to the caller. no exiting, no chaos, just info. 🫶

here's what the arguments are, and bestie, they are exactly what they sound like:

• fp — the fp, passed to the vfprintf(3) system call exactly as-is. no vibes-altering, no edits. ✨
• format — the format, passed to the vfprintf(3) system call exactly as-is.
• ap — the ap, passed to the vfprintf(3) system call exactly as-is.

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👑 RETURN VALUE 👑

explain_vfprintf_or_die only returns on success — see vfprintf(3) for more info on that. on failure it prints an explanation and exits, and it does not return. like, at all. it's gone. 💨

explain_vfprintf_on_error always returns the value returned by the wrapped vfprintf(3) system call. always. reliable queen. 💖

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🌈 EXAMPLE 🌈

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

explain_vfprintf_or_die(fp, format, ap);

that's it, that's the whole example, and it ate. 🔥

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⭐ SEE ALSO ⭐

• vfprintf(3) — formatted output conversion
• explain_vfprintf(3) — explain vfprintf(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 a wrap on explain_vfprintf_or_die(3), bestie 🎀 go forth, format your output, and let the errors explain themselves. periodt. 💅🦋🌸