libiberty/vasprintf.c

   1 /* Like vsprintf but provides a pointer to malloc'd storage, which must
   2    be freed by the caller.
   3    Copyright (C) 1994-2017 Free Software Foundation, Inc.
   4
   5 This file is part of the libiberty library.
   6 Libiberty is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU Library General Public
   8 License as published by the Free Software Foundation; either
   9 version 2 of the License, or (at your option) any later version.
  10
  11 Libiberty is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 Library General Public License for more details.
  15
  16 You should have received a copy of the GNU Library General Public
  17 License along with libiberty; see the file COPYING.LIB.  If not, write
  18 to the Free Software Foundation, Inc., 51 Franklin Street - Fifth
  19 Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24 #include <ansidecl.h>
  25 #include <stdarg.h>
  26 #if !defined (va_copy) && defined (__va_copy)
  27 # define va_copy(d,s)  __va_copy((d),(s))
  28 #endif
  29 #include <stdio.h>
  30 #ifdef HAVE_STRING_H
  31 #include <string.h>
  32 #endif
  33 #ifdef HAVE_STDLIB_H
  34 #include <stdlib.h>
  35 #else
  36 extern PTR malloc ();
  37 #endif
  38 #include "libiberty.h"
  39 #include "vprintf-support.h"
  40
  41 #ifdef TEST
  42 int global_total_width;
  43 #endif
  44
  45 /*
  46
  47 @deftypefn Extension int vasprintf (char **@var{resptr}, @
  48   const char *@var{format}, va_list @var{args})
  49
  50 Like @code{vsprintf}, but instead of passing a pointer to a buffer,
  51 you pass a pointer to a pointer.  This function will compute the size
  52 of the buffer needed, allocate memory with @code{malloc}, and store a
  53 pointer to the allocated memory in @code{*@var{resptr}}.  The value
  54 returned is the same as @code{vsprintf} would return.  If memory could
  55 not be allocated, minus one is returned and @code{NULL} is stored in
  56 @code{*@var{resptr}}.
  57
  58 @end deftypefn
  59
  60 */
  61
  62 static int int_vasprintf (char **, const char *, va_list);
  63
  64 static int
  65 int_vasprintf (char **result, const char *format, va_list args)
  66 {
  67   int total_width = libiberty_vprintf_buffer_size (format, args);
  68 #ifdef TEST
  69   global_total_width = total_width;
  70 #endif
  71   *result = (char *) malloc (total_width);
  72   if (*result != NULL)
  73     return vsprintf (*result, format, args);
  74   else
  75     return -1;
  76 }
  77
  78 int
  79 vasprintf (char **result, const char *format,
  80 #if defined (_BSD_VA_LIST_) && defined (__FreeBSD__)
  81            _BSD_VA_LIST_ args)
  82 #else
  83            va_list args)
  84 #endif
  85 {
  86   return int_vasprintf (result, format, args);
  87 }
  88
  89 #ifdef TEST
  90 static void ATTRIBUTE_PRINTF_1
  91 checkit (const char *format, ...)
  92 {
  93   char *result;
  94   va_list args;
  95   va_start (args, format);
  96   vasprintf (&result, format, args);
  97   va_end (args);
  98
  99   if (strlen (result) < (size_t) global_total_width)
 100     printf ("PASS: ");
 101   else
 102     printf ("FAIL: ");
 103   printf ("%d %s\n", global_total_width, result);
 104
 105   free (result);
 106 }
 107
 108 extern int main (void);
 109
 110 int
 111 main (void)
 112 {
 113   checkit ("%d", 0x12345678);
 114   checkit ("%200d", 5);
 115   checkit ("%.300d", 6);
 116   checkit ("%100.150d", 7);
 117   checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
 118 777777777777777777333333333333366666666666622222222222777777777777733333");
 119   checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx");
 120
 121   return 0;
 122 }
 123 #endif /* TEST */