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/* vasprintf and asprintf, with out-of-memory checking, in C locale.
   Copyright (C) 2002-2004, 2006-2025 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

#ifndef _C_XVASPRINTF_H
#define _C_XVASPRINTF_H

/* This file uses _GL_ATTRIBUTE_FORMAT, _GL_ATTRIBUTE_MALLOC,
  _GL_ATTRIBUTE_RETURNS_NONNULL.  */
#if !_GL_CONFIG_H_INCLUDED
 #error "Please include config.h first."
#endif

/* Get va_list.  */
#include <stdarg.h>

/* Get _GL_ATTRIBUTE_SPEC_PRINTF_STANDARD.  */
#include <stdio.h>

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Prints formatted output to a string dynamically allocated with malloc(),
   and returns it.  Upon [ENOMEM] memory allocation error, it calls xalloc_die.

   It is the responsibility of the programmer to ensure that
     - the format string is valid,
     - the format string does not use %ls or %lc directives, and
     - all widths in the format string and passed as arguments are >= -INT_MAX
       and <= INT_MAX,
   so that other errors
     - [EINVAL] invalid format string,
     - [EILSEQ] error during conversion between wide and multibyte characters,
     - [EOVERFLOW] some specified width is > INT_MAX,
   cannot occur.

   Formatting takes place in the C locale, that is, the decimal point
   used in floating-point formatting directives is always '.'. */
extern char *c_xasprintf (const char *format, ...)
  _GL_ATTRIBUTE_FORMAT ((_GL_ATTRIBUTE_SPEC_PRINTF_STANDARD, 1, 2))
  _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  _GL_ATTRIBUTE_RETURNS_NONNULL;
extern char *c_xvasprintf (const char *format, va_list args)
  _GL_ATTRIBUTE_FORMAT ((_GL_ATTRIBUTE_SPEC_PRINTF_STANDARD, 1, 0))
  _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
  _GL_ATTRIBUTE_RETURNS_NONNULL;

#ifdef __cplusplus
}
#endif

#endif /* _C_XVASPRINTF_H */
kc3-lang/gnulib/lib/c-xvasprintf.h

Commit

lib/c-xvasprintf.h
