lib/printf-args.c

   1 /* Decomposed printf argument list.
   2    Copyright (C) 1999, 2002-2003, 2005-2007, 2009-2019 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 <https://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 /* Specification.  */
  28 #ifndef PRINTF_FETCHARGS
  29 # include "printf-args.h"
  30 #endif
  31
  32 #ifdef STATIC
  33 STATIC
  34 #endif
  35 int
  36 PRINTF_FETCHARGS (va_list args, arguments *a)
  37 {
  38   size_t i;
  39   argument *ap;
  40
  41   for (i = 0, ap = &a->arg[0]; i < a->count; i++, ap++)
  42     switch (ap->type)
  43       {
  44       case TYPE_SCHAR:
  45         ap->a.a_schar = va_arg (args, /*signed char*/ int);
  46         break;
  47       case TYPE_UCHAR:
  48         ap->a.a_uchar = va_arg (args, /*unsigned char*/ int);
  49         break;
  50       case TYPE_SHORT:
  51         ap->a.a_short = va_arg (args, /*short*/ int);
  52         break;
  53       case TYPE_USHORT:
  54         ap->a.a_ushort = va_arg (args, /*unsigned short*/ int);
  55         break;
  56       case TYPE_INT:
  57         ap->a.a_int = va_arg (args, int);
  58         break;
  59       case TYPE_UINT:
  60         ap->a.a_uint = va_arg (args, unsigned int);
  61         break;
  62       case TYPE_LONGINT:
  63         ap->a.a_longint = va_arg (args, long int);
  64         break;
  65       case TYPE_ULONGINT:
  66         ap->a.a_ulongint = va_arg (args, unsigned long int);
  67         break;
  68 #if HAVE_LONG_LONG_INT
  69       case TYPE_LONGLONGINT:
  70         ap->a.a_longlongint = va_arg (args, long long int);
  71         break;
  72       case TYPE_ULONGLONGINT:
  73         ap->a.a_ulonglongint = va_arg (args, unsigned long long int);
  74         break;
  75 #endif
  76       case TYPE_DOUBLE:
  77         ap->a.a_double = va_arg (args, double);
  78         break;
  79       case TYPE_LONGDOUBLE:
  80         ap->a.a_longdouble = va_arg (args, long double);
  81         break;
  82       case TYPE_CHAR:
  83         ap->a.a_char = va_arg (args, int);
  84         break;
  85 #if HAVE_WINT_T
  86       case TYPE_WIDE_CHAR:
  87         /* Although ISO C 99 7.24.1.(2) says that wint_t is "unchanged by
  88            default argument promotions", this is not the case in mingw32,
  89            where wint_t is 'unsigned short'.  */
  90         ap->a.a_wide_char =
  91           (sizeof (wint_t) < sizeof (int)
  92            ? (wint_t) va_arg (args, int)
  93            : va_arg (args, wint_t));
  94         break;
  95 #endif
  96       case TYPE_STRING:
  97         ap->a.a_string = va_arg (args, const char *);
  98         /* A null pointer is an invalid argument for "%s", but in practice
  99            it occurs quite frequently in printf statements that produce
 100            debug output.  Use a fallback in this case.  */
 101         if (ap->a.a_string == NULL)
 102           ap->a.a_string = "(NULL)";
 103         break;
 104 #if HAVE_WCHAR_T
 105       case TYPE_WIDE_STRING:
 106         ap->a.a_wide_string = va_arg (args, const wchar_t *);
 107         /* A null pointer is an invalid argument for "%ls", but in practice
 108            it occurs quite frequently in printf statements that produce
 109            debug output.  Use a fallback in this case.  */
 110         if (ap->a.a_wide_string == NULL)
 111           {
 112             static const wchar_t wide_null_string[] =
 113               {
 114                 (wchar_t)'(',
 115                 (wchar_t)'N', (wchar_t)'U', (wchar_t)'L', (wchar_t)'L',
 116                 (wchar_t)')',
 117                 (wchar_t)0
 118               };
 119             ap->a.a_wide_string = wide_null_string;
 120           }
 121         break;
 122 #endif
 123       case TYPE_POINTER:
 124         ap->a.a_pointer = va_arg (args, void *);
 125         break;
 126       case TYPE_COUNT_SCHAR_POINTER:
 127         ap->a.a_count_schar_pointer = va_arg (args, signed char *);
 128         break;
 129       case TYPE_COUNT_SHORT_POINTER:
 130         ap->a.a_count_short_pointer = va_arg (args, short *);
 131         break;
 132       case TYPE_COUNT_INT_POINTER:
 133         ap->a.a_count_int_pointer = va_arg (args, int *);
 134         break;
 135       case TYPE_COUNT_LONGINT_POINTER:
 136         ap->a.a_count_longint_pointer = va_arg (args, long int *);
 137         break;
 138 #if HAVE_LONG_LONG_INT
 139       case TYPE_COUNT_LONGLONGINT_POINTER:
 140         ap->a.a_count_longlongint_pointer = va_arg (args, long long int *);
 141         break;
 142 #endif
 143 #if ENABLE_UNISTDIO
 144       /* The unistdio extensions.  */
 145       case TYPE_U8_STRING:
 146         ap->a.a_u8_string = va_arg (args, const uint8_t *);
 147         /* A null pointer is an invalid argument for "%U", but in practice
 148            it occurs quite frequently in printf statements that produce
 149            debug output.  Use a fallback in this case.  */
 150         if (ap->a.a_u8_string == NULL)
 151           {
 152             static const uint8_t u8_null_string[] =
 153               { '(', 'N', 'U', 'L', 'L', ')', 0 };
 154             ap->a.a_u8_string = u8_null_string;
 155           }
 156         break;
 157       case TYPE_U16_STRING:
 158         ap->a.a_u16_string = va_arg (args, const uint16_t *);
 159         /* A null pointer is an invalid argument for "%lU", but in practice
 160            it occurs quite frequently in printf statements that produce
 161            debug output.  Use a fallback in this case.  */
 162         if (ap->a.a_u16_string == NULL)
 163           {
 164             static const uint16_t u16_null_string[] =
 165               { '(', 'N', 'U', 'L', 'L', ')', 0 };
 166             ap->a.a_u16_string = u16_null_string;
 167           }
 168         break;
 169       case TYPE_U32_STRING:
 170         ap->a.a_u32_string = va_arg (args, const uint32_t *);
 171         /* A null pointer is an invalid argument for "%llU", but in practice
 172            it occurs quite frequently in printf statements that produce
 173            debug output.  Use a fallback in this case.  */
 174         if (ap->a.a_u32_string == NULL)
 175           {
 176             static const uint32_t u32_null_string[] =
 177               { '(', 'N', 'U', 'L', 'L', ')', 0 };
 178             ap->a.a_u32_string = u32_null_string;
 179           }
 180         break;
 181 #endif
 182       default:
 183         /* Unknown type.  */
 184         return -1;
 185       }
 186   return 0;
 187 }