glib/gnulib/printf-args.c

   1 /* Decomposed printf argument list.
   2    Copyright (C) 1999, 2002-2003, 2005-2007, 2009-2015 Free Software
   3    Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License along
  16    with this program; if not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* This file can be parametrized with the following macros:
  19      ENABLE_UNISTDIO    Set to 1 to enable the unistdio extensions.
  20      PRINTF_FETCHARGS   Name of the function to be defined.
  21      STATIC             Set to 'static' to declare the function static.  */
  22
  23 #ifndef PRINTF_FETCHARGS
  24 # include <config.h>
  25 #endif
  26
  27 #include "g-gnulib.h"
  28
  29 /* Specification.  */
  30 #ifndef PRINTF_FETCHARGS
  31 # include "printf-args.h"
  32 #endif
  33
  34 #ifdef STATIC
  35 STATIC
  36 #endif
  37 int
  38 PRINTF_FETCHARGS (va_list args, arguments *a)
  39 {
  40   size_t i;
  41   argument *ap;
  42
  43   for (i = 0, ap = &a->arg[0]; i < a->count; i++, ap++)
  44     switch (ap->type)
  45       {
  46       case TYPE_SCHAR:
  47         ap->a.a_schar = va_arg (args, /*signed char*/ int);
  48         break;
  49       case TYPE_UCHAR:
  50         ap->a.a_uchar = va_arg (args, /*unsigned char*/ int);
  51         break;
  52       case TYPE_SHORT:
  53         ap->a.a_short = va_arg (args, /*short*/ int);
  54         break;
  55       case TYPE_USHORT:
  56         ap->a.a_ushort = va_arg (args, /*unsigned short*/ int);
  57         break;
  58       case TYPE_INT:
  59         ap->a.a_int = va_arg (args, int);
  60         break;
  61       case TYPE_UINT:
  62         ap->a.a_uint = va_arg (args, unsigned int);
  63         break;
  64       case TYPE_LONGINT:
  65         ap->a.a_longint = va_arg (args, long int);
  66         break;
  67       case TYPE_ULONGINT:
  68         ap->a.a_ulongint = va_arg (args, unsigned long int);
  69         break;
  70 #if HAVE_LONG_LONG
  71       case TYPE_LONGLONGINT:
  72         ap->a.a_longlongint = va_arg (args, long long int);
  73         break;
  74       case TYPE_ULONGLONGINT:
  75         ap->a.a_ulonglongint = va_arg (args, unsigned long long int);
  76         break;
  77 #endif
  78       case TYPE_DOUBLE:
  79         ap->a.a_double = va_arg (args, double);
  80         break;
  81       case TYPE_LONGDOUBLE:
  82         ap->a.a_longdouble = va_arg (args, long double);
  83         break;
  84       case TYPE_CHAR:
  85         ap->a.a_char = va_arg (args, int);
  86         break;
  87 #if HAVE_WINT_T
  88       case TYPE_WIDE_CHAR:
  89         /* Although ISO C 99 7.24.1.(2) says that wint_t is "unchanged by
  90            default argument promotions", this is not the case in mingw32,
  91            where wint_t is 'unsigned short'.  */
  92         ap->a.a_wide_char =
  93           (sizeof (wint_t) < sizeof (int)
  94            ? (wint_t) va_arg (args, int)
  95            : va_arg (args, wint_t));
  96         break;
  97 #endif
  98       case TYPE_STRING:
  99         ap->a.a_string = va_arg (args, const char *);
 100         /* A null pointer is an invalid argument for "%s", but in practice
 101            it occurs quite frequently in printf statements that produce
 102            debug output.  Use a fallback in this case.  */
 103         if (ap->a.a_string == NULL)
 104           ap->a.a_string = "(NULL)";
 105         break;
 106 #if HAVE_WCHAR_T
 107       case TYPE_WIDE_STRING:
 108         ap->a.a_wide_string = va_arg (args, const wchar_t *);
 109         /* A null pointer is an invalid argument for "%ls", but in practice
 110            it occurs quite frequently in printf statements that produce
 111            debug output.  Use a fallback in this case.  */
 112         if (ap->a.a_wide_string == NULL)
 113           {
 114             static const wchar_t wide_null_string[] =
 115               {
 116                 (wchar_t)'(',
 117                 (wchar_t)'N', (wchar_t)'U', (wchar_t)'L', (wchar_t)'L',
 118                 (wchar_t)')',
 119                 (wchar_t)0
 120               };
 121             ap->a.a_wide_string = wide_null_string;
 122           }
 123         break;
 124 #endif
 125       case TYPE_POINTER:
 126         ap->a.a_pointer = va_arg (args, void *);
 127         break;
 128       case TYPE_COUNT_SCHAR_POINTER:
 129         ap->a.a_count_schar_pointer = va_arg (args, signed char *);
 130         break;
 131       case TYPE_COUNT_SHORT_POINTER:
 132         ap->a.a_count_short_pointer = va_arg (args, short *);
 133         break;
 134       case TYPE_COUNT_INT_POINTER:
 135         ap->a.a_count_int_pointer = va_arg (args, int *);
 136         break;
 137       case TYPE_COUNT_LONGINT_POINTER:
 138         ap->a.a_count_longint_pointer = va_arg (args, long int *);
 139         break;
 140 #if HAVE_LONG_LONG
 141       case TYPE_COUNT_LONGLONGINT_POINTER:
 142         ap->a.a_count_longlongint_pointer = va_arg (args, long long int *);
 143         break;
 144 #endif
 145 #if ENABLE_UNISTDIO
 146       /* The unistdio extensions.  */
 147       case TYPE_U8_STRING:
 148         ap->a.a_u8_string = va_arg (args, const uint8_t *);
 149         /* A null pointer is an invalid argument for "%U", but in practice
 150            it occurs quite frequently in printf statements that produce
 151            debug output.  Use a fallback in this case.  */
 152         if (ap->a.a_u8_string == NULL)
 153           {
 154             static const uint8_t u8_null_string[] =
 155               { '(', 'N', 'U', 'L', 'L', ')', 0 };
 156             ap->a.a_u8_string = u8_null_string;
 157           }
 158         break;
 159       case TYPE_U16_STRING:
 160         ap->a.a_u16_string = va_arg (args, const uint16_t *);
 161         /* A null pointer is an invalid argument for "%lU", but in practice
 162            it occurs quite frequently in printf statements that produce
 163            debug output.  Use a fallback in this case.  */
 164         if (ap->a.a_u16_string == NULL)
 165           {
 166             static const uint16_t u16_null_string[] =
 167               { '(', 'N', 'U', 'L', 'L', ')', 0 };
 168             ap->a.a_u16_string = u16_null_string;
 169           }
 170         break;
 171       case TYPE_U32_STRING:
 172         ap->a.a_u32_string = va_arg (args, const uint32_t *);
 173         /* A null pointer is an invalid argument for "%llU", but in practice
 174            it occurs quite frequently in printf statements that produce
 175            debug output.  Use a fallback in this case.  */
 176         if (ap->a.a_u32_string == NULL)
 177           {
 178             static const uint32_t u32_null_string[] =
 179               { '(', 'N', 'U', 'L', 'L', ')', 0 };
 180             ap->a.a_u32_string = u32_null_string;
 181           }
 182         break;
 183 #endif
 184       default:
 185         /* Unknown type.  */
 186         return -1;
 187       }
 188   return 0;
 189 }