explain_strtold(3)

💖 explain_strtold(3) — Library Functions Manual 💖

okay bestie, gather round, because we're about to talk about explain_strtold(3) from the libexplain girlies. this is the page that explains how to explain strtold(3) errors. yes it's explainception. yes it slays. 🎀

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✨ NAME ✨

explain_strtold — explain strtold(3) errors

like, it takes your strtold(3) oopsie and turns it into an actual sentence you can read. no cap.

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🌸 SYNOPSIS 🌸

#include <libexplain/strtold.h>
const char *explain_strtold(const char *nptr, char **endptr);
const char *explain_errno_strtold(int errnum, const char *nptr, char
**endptr);
void explain_message_strtold(char *message, int message_size, const char
*nptr, char **endptr);
void explain_message_errno_strtold(char *message, int message_size, int
errnum, const char *nptr, char **endptr);

four functions, four vibes, all here to hold your hand through the error messages 💅

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🦋 DESCRIPTION 🦋

These functions may be used to obtain explanations for errors returned by the strtold(3) system call. that's the whole assignment. they take the chaos of an errno and turn it into something you can actually read. iconic behavior honestly.

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💜 explain_strtold

const char *explain_strtold(const char *nptr, char **endptr);

The explain_strtold function is used to obtain an explanation of an error returned by the strtold(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 errno global variable will be used to obtain the error value to be decoded. she reads your errno for you, no extra steps 💖

• nptr — The original nptr, exactly as passed to the strtold(3) system call. like, the exact same one, don't get creative.
• endptr — The original endptr, exactly as passed to the strtold(3) system call. same deal, verbatim bestie.

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. so if you're multithreading, beware — she's got one shared buffer and everybody's fighting over it 😭

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

long double result = strtold(nptr, endptr);
if (result < 0)
{
    fprintf(stderr, "%s\n", explain_strtold(nptr, endptr));
    exit(EXIT_FAILURE);
}

The above code example is available pre‐packaged as the explain_strtold_or_die(3) function. yes, someone already did the work for you. you're welcome. 🫶

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🌈 explain_errno_strtold

const char *explain_errno_strtold(int errnum, const char *nptr, char
**endptr);

The explain_errno_strtold function is used to obtain an explanation of an error returned by the strtold(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.

• 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 your errno immediately or it's gone forever, she's fickle 💀
• nptr — The original nptr, exactly as passed to the strtold(3) system call.
• endptr — The original endptr, exactly as passed to the strtold(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. same warning, same shared-buffer drama 🙈

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

long double result = strtold(nptr, endptr);
if (result < 0)
{
    int err = errno;
    fprintf(stderr, "%s\n", explain_errno_strtold(err, nptr,
    endptr));
    exit(EXIT_FAILURE);
}

The above code example is available pre‐packaged as the explain_strtold_or_die(3) function. 🌟

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🎀 explain_message_strtold

void explain_message_strtold(char *message, int message_size, const char
*nptr, char **endptr);

The explain_message_strtold function is used to obtain an explanation of an error returned by the strtold(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 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. look at her, being all considerate and thread safe when you give her her own buffer 👑
• message_size — The size in bytes of the location in which to store the returned message.
• nptr — The original nptr, exactly as passed to the strtold(3) system call.
• endptr — The original endptr, exactly as passed to the strtold(3) system call.

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

long double result = strtold(nptr, endptr);
if (result < 0)
{
    char message[3000];
    explain_message_strtold(message, sizeof(message), nptr,
    endptr);
    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

The above code example is available pre‐packaged as the explain_strtold_or_die(3) function. 💜

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⭐ explain_message_errno_strtold

void explain_message_errno_strtold(char *message, int message_size, int
errnum, const char *nptr, char **endptr);

The explain_message_errno_strtold function is used to obtain an explanation of an error returned by the strtold(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.

• 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. grab it fast bestie, seriously 🔥
• nptr — The original nptr, exactly as passed to the strtold(3) system call.
• endptr — The original endptr, exactly as passed to the strtold(3) system call.

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

long double result = strtold(nptr, endptr);
if (result < 0)
{
    int err = errno;
    char message[3000];
    explain_message_errno_strtold(message, sizeof(message), err,
    nptr, endptr);
    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

The above code example is available pre‐packaged as the explain_strtold_or_die(3) function. 🧚

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👀 SEE ALSO 👀

• strtold(3) — convert ASCII string to floating‐point number
• explain_strtold_or_die(3) — convert ASCII string to floating‐point number and report errors

like the pre-packaged version that already does the dying for you. main character energy, honestly. 💅

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📜 COPYRIGHT 📜

libexplain version 1.4 Copyright (C) 2009 Peter Miller

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okay that's the whole page bestie, we did it 🎉 the header up top said explain_strtold(3) and the manual it lives in is the Library Functions Manual, and this whole thing came to you courtesy of libexplain version 1.4, with Copyright (C) 2009 Peter Miller holding it down at the bottom. now go forth and explain those strtold(3) errors, you absolute icon 💖✨🦋🌸