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1bc3a25505
The Cosmo API documentation page is pretty good now https://justine.lol/cosmopolitan/documentation.html
72 lines
4 KiB
C
72 lines
4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/stdio/stdio.h"
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/**
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* Formats and writes string to stdout.
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*
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* Cosmopolitan supports most of the standard formatting behaviors
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* described by `man 3 printf`, in addition to the following:
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*
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* - `%jd`, `%jx`, etc. are {,u}intmax_t which in Cosmopolitan is 128-bit.
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*
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* - `%'d` or `%,d` may be used to insert thousands separators. The prior is
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* consistent with C; the latter is consistent with Python.
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*
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* - `%m` inserts strerror(errno) into the formatted output. This is
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* consistent with glibc, musl, and uclibc.
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*
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* - `%n` inserts "\n" on non-Windows and "\r\n" on Windows. This is the
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* same behavior as Java. It's incompatible with glibc's behavior,
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* since that's problematic according to Android's security team.
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*
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* - `%hs` converts UTF-16/UCS-2 → UTF-8, which can be helpful on Windows.
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* Formatting (e.g. %-10hs) will use monospace display width rather
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* than string length or codepoint count.
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*
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* - `%ls` (or `%Ls`) converts UTF-32 → UTF-8. Formatting (e.g. %-10ls)
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* will use monospace display width rather than string length.
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*
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* - The `%#s` and `%#c` alternate forms display values using the
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* standard IBM standard 256-letter alphabet. Using `%#.*s` to specify
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* length will allow true binary (i.e. with NULs) to be formatted.
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*
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* - The `%'s` and `%'c` alternate forms are Cosmopolitan extensions for
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* escaping string literals for C/C++ and Python. The outer quotation
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* marks can be added automatically using ``%`s``. If constexpr format
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* strings are used, we can avoid linking cescapec() too.
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*
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* - The backtick modifier (``%`s`` and ``%`c``) and repr() directive
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* (`%r`) both ask the formatting machine to represent values as real
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* code rather than using arbitrary traditions for displaying values.
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* This means it implies the quoting modifier, wraps the value with
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* {,u,L}['"] quotes, displays NULL as "NULL" rather than "(null)".
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*
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* @see palandprintf() for intuitive reference documentation
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* @see {,v}{,s{,n},{,{,x}as},f,d}printf
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*/
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int(printf)(const char* fmt, ...) {
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int rc;
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va_list va;
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va_start(va, fmt);
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rc = (vfprintf)(stdout, fmt, va);
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va_end(va);
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return rc;
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}
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