explain_puts(3)

💖 explain_puts(3) 💖

okay bestie, so this is a page from the Library Functions Manual, and it's all about explain_puts — the lil glow-up your error messages get when puts(3) decides to flop. sit with me, we're doing this together 🫶

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✨ NAME ✨

explain_puts — explain puts(3) errors 💅

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🌸 SYNOPSIS 🌸

#include <libexplain/puts.h>
const char *explain_puts(const char *s);
const char *explain_errno_puts(int errnum, const char *s);
void explain_message_puts(char *message, int message_size, const char *s);
void explain_message_errno_puts(char *message, int message_size, int errnum, const char *s);

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🦋 DESCRIPTION 🦋

These functions are your little translators, fr fr — you use them to obtain explanations for errors returned by the puts(3) system call. it's giving "let me tell you what actually went wrong" energy ✨

💜 explain_puts

const char *explain_puts(const char *s);

The explain_puts function is used to obtain an explanation of an error returned by the puts(3) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail. it's giving overachiever, and we love that 👑

The errno global variable will be used to obtain the error value to be decoded.

• s — The original s, exactly as passed to the puts(3) system call. no edits, no remix, the same one 💯

Returns: The message explaining the error. This message buffer is shared by all libexplain functions which do not supply a buffer in their argument list. This will be overwritten by the next call to any libexplain function which shares this buffer, including other threads. 😭

Note: This function is not thread safe, because it shares a return buffer across all threads, and many other functions in this library. bestie please be careful with this one 🙈

Example: This function is intended to be used in a fashion similar to the following example:

if (puts(s) < 0)
{
    fprintf(stderr, "%s\n", explain_puts(s));
    exit(EXIT_FAILURE);
}

The above code example is available pre-packaged as the explain_puts_or_die(3) function. so convenient, so iconic ✨

🎀 explain_errno_puts

const char *explain_errno_puts(int errnum, const char *s);

The explain_errno_puts function is used to obtain an explanation of an error returned by the puts(3) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail. yes it really said "usually do much better" 💅

• errnum — The error value to be decoded, usually obtained from the errno global variable just before this function is called. This is necessary if you need to call any code between the system call to be explained and this function, because many libc functions will alter the value of errno. so like, grab it early or it's gone girl 💀
• s — The original s, exactly as passed to the puts(3) system call.

Returns: The message explaining the error. This message buffer is shared by all libexplain functions which do not supply a buffer in their argument list. This will be overwritten by the next call to any libexplain function which shares this buffer, including other threads.

Note: This function is not thread safe, because it shares a return buffer across all threads, and many other functions in this library.

Example: This function is intended to be used in a fashion similar to the following example:

if (puts(s) < 0)
{
    int err = errno;
    fprintf(stderr, "%s\n", explain_errno_puts(err, s));
    exit(EXIT_FAILURE);
}

The above code example is available pre-packaged as the explain_puts_or_die(3) function. 🌈

🧚 explain_message_puts

void explain_message_puts(char *message, int message_size, const char *s);

The explain_message_puts function is used to obtain an explanation of an error returned by the puts(3) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail. same deal, different signature 🫶

The errno global variable will be used to obtain the error value to be decoded.

• message — The location in which to store the returned message. If a suitable message return buffer is supplied, this function is thread safe. main character energy, actually safe 🔥
• message_size — The size in bytes of the location in which to store the returned message. don't skimp on the bytes bestie.
• s — The original s, exactly as passed to the puts(3) system call.

Example: This function is intended to be used in a fashion similar to the following example:

if (puts(s) < 0)
{
    char message[3000];
    explain_message_puts(message, sizeof(message), s);
    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

The above code example is available pre-packaged as the explain_puts_or_die(3) function. 🍓

🌟 explain_message_errno_puts

void explain_message_errno_puts(char *message, int message_size, int errnum, const char *s);

The explain_message_errno_puts function is used to obtain an explanation of an error returned by the puts(3) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail. the full combo meal, errno and your own buffer, we ate 💅

• message — The location in which to store the returned message. If a suitable message return buffer is supplied, this function is thread safe.
• message_size — The size in bytes of the location in which to store the returned message.
• errnum — The error value to be decoded, usually obtained from the errno global variable just before this function is called. This is necessary if you need to call any code between the system call to be explained and this function, because many libc functions will alter the value of errno. iykyk 😭
• s — The original s, exactly as passed to the puts(3) system call.

Example: This function is intended to be used in a fashion similar to the following example:

if (puts(s) < 0)
{
    int err = errno;
    char message[3000];
    explain_message_errno_puts(message, sizeof(message), err, s);
    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

The above code example is available pre-packaged as the explain_puts_or_die(3) function. ⭐

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👑 SEE ALSO 👑

• puts(3) — write a string and a trailing newline to stdout
• explain_puts_or_die(3) — write a string and a trailing newline to stdout and report errors

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🌈 COPYRIGHT 🌈

libexplain version 1.4
Copyright (C) 2009 Peter Miller

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and that's the whole page bestie, no cap, every flag and every word intact 💖 libexplain version 1.4, Copyright (C) 2009 Peter Miller — go forth and explain your errors, periodt 🎀✨