maint/gnulib/lib/vasnprintf.h

/* */
   1 /* vsprintf with automatic memory allocation.
   2    Copyright (C) 2002-2004, 2007-2021 Free Software Foundation, Inc.
   3 
   4    This file is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8 
   9    This file is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13 
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16 
  17 #ifndef _VASNPRINTF_H
  18 #define _VASNPRINTF_H
  19 
  20 /* Get va_list.  */
  21 #include <stdarg.h>
  22 
  23 /* Get size_t.  */
  24 #include <stddef.h>
  25 
  26 /* Get _GL_ATTRIBUTE_SPEC_PRINTF_STANDARD.  */
  27 #include <stdio.h>
  28 
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32 
  33 /* Write formatted output to a string dynamically allocated with malloc().
  34    You can pass a preallocated buffer for the result in RESULTBUF and its
  35    size in *LENGTHP; otherwise you pass RESULTBUF = NULL.
  36    If successful, return the address of the string (this may be = RESULTBUF
  37    if no dynamic memory allocation was necessary) and set *LENGTHP to the
  38    number of resulting bytes, excluding the trailing NUL.  Upon error, set
  39    errno and return NULL.
  40 
  41    When dynamic memory allocation occurs, the preallocated buffer is left
  42    alone (with possibly modified contents).  This makes it possible to use
  43    a statically allocated or stack-allocated buffer, like this:
  44 
  45           char buf[100];
  46           size_t len = sizeof (buf);
  47           char *output = vasnprintf (buf, &len, format, args);
  48           if (output == NULL)
  49             ... error handling ...;
  50           else
  51             {
  52               ... use the output string ...;
  53               if (output != buf)
  54                 free (output);
  55             }
  56   */
  57 #if REPLACE_VASNPRINTF
  58 # define asnprintf rpl_asnprintf
  59 # define vasnprintf rpl_vasnprintf
  60 #endif
  61 extern char * asnprintf (char *restrict resultbuf, size_t *lengthp,
  62                          const char *format, ...)
  63        _GL_ATTRIBUTE_FORMAT ((_GL_ATTRIBUTE_SPEC_PRINTF_STANDARD, 3, 4));
  64 extern char * vasnprintf (char *restrict resultbuf, size_t *lengthp,
  65                           const char *format, va_list args)
  66        _GL_ATTRIBUTE_FORMAT ((_GL_ATTRIBUTE_SPEC_PRINTF_STANDARD, 3, 0));
  67 
  68 #ifdef __cplusplus
  69 }
  70 #endif
  71 
  72 #endif /* _VASNPRINTF_H */
/* */
root/maint/gnulib/lib/vasnprintf.h

INCLUDED FROM
