lib/printf-args.c

   1 /* Decomposed printf argument list.
   2    Copyright (C) 1999, 2002-2003, 2005-2007, 2009-2020 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       case TYPE_LONGLONGINT:
  69         ap->a.a_longlongint = va_arg (args, long long int);
  70         break;
  71       case TYPE_ULONGLONGINT:
  72         ap->a.a_ulonglongint = va_arg (args, unsigned long long int);
  73         break;
  74       case TYPE_DOUBLE:
  75         ap->a.a_double = va_arg (args, double);
  76         break;
  77       case TYPE_LONGDOUBLE:
  78         ap->a.a_longdouble = va_arg (args, long double);
  79         break;
  80       case TYPE_CHAR:
  81         ap->a.a_char = va_arg (args, int);
  82         break;
  83 #if HAVE_WINT_T
  84       case TYPE_WIDE_CHAR:
  85         /* Although ISO C 99 7.24.1.(2) says that wint_t is "unchanged by
  86            default argument promotions", this is not the case in mingw32,
  87            where wint_t is 'unsigned short'.  */
  88         ap->a.a_wide_char =
  89           (sizeof (wint_t) < sizeof (int)
  90            ? (wint_t) va_arg (args, int)
  91            : va_arg (args, wint_t));
  92         break;
  93 #endif
  94       case TYPE_STRING:
  95         ap->a.a_string = va_arg (args, const char *);
  96         /* A null pointer is an invalid argument for "%s", but in practice
  97            it occurs quite frequently in printf statements that produce
  98            debug output.  Use a fallback in this case.  */
  99         if (ap->a.a_string == NULL)
 100           ap->a.a_string = "(NULL)";
 101         break;
 102 #if HAVE_WCHAR_T
 103       case TYPE_WIDE_STRING:
 104         ap->a.a_wide_string = va_arg (args, const wchar_t *);
 105         /* A null pointer is an invalid argument for "%ls", but in practice
 106            it occurs quite frequently in printf statements that produce
 107            debug output.  Use a fallback in this case.  */
 108         if (ap->a.a_wide_string == NULL)
 109           {
 110             static const wchar_t wide_null_string[] =
 111               {
 112                 (wchar_t)'(',
 113                 (wchar_t)'N', (wchar_t)'U', (wchar_t)'L', (wchar_t)'L',
 114                 (wchar_t)')',
 115                 (wchar_t)0
 116               };
 117             ap->a.a_wide_string = wide_null_string;
 118           }
 119         break;
 120 #endif
 121       case TYPE_POINTER:
 122         ap->a.a_pointer = va_arg (args, void *);
 123         break;
 124       case TYPE_COUNT_SCHAR_POINTER:
 125         ap->a.a_count_schar_pointer = va_arg (args, signed char *);
 126         break;
 127       case TYPE_COUNT_SHORT_POINTER:
 128         ap->a.a_count_short_pointer = va_arg (args, short *);
 129         break;
 130       case TYPE_COUNT_INT_POINTER:
 131         ap->a.a_count_int_pointer = va_arg (args, int *);
 132         break;
 133       case TYPE_COUNT_LONGINT_POINTER:
 134         ap->a.a_count_longint_pointer = va_arg (args, long int *);
 135         break;
 136       case TYPE_COUNT_LONGLONGINT_POINTER:
 137         ap->a.a_count_longlongint_pointer = va_arg (args, long long int *);
 138         break;
 139 #if ENABLE_UNISTDIO
 140       /* The unistdio extensions.  */
 141       case TYPE_U8_STRING:
 142         ap->a.a_u8_string = va_arg (args, const uint8_t *);
 143         /* A null pointer is an invalid argument for "%U", but in practice
 144            it occurs quite frequently in printf statements that produce
 145            debug output.  Use a fallback in this case.  */
 146         if (ap->a.a_u8_string == NULL)
 147           {
 148             static const uint8_t u8_null_string[] =
 149               { '(', 'N', 'U', 'L', 'L', ')', 0 };
 150             ap->a.a_u8_string = u8_null_string;
 151           }
 152         break;
 153       case TYPE_U16_STRING:
 154         ap->a.a_u16_string = va_arg (args, const uint16_t *);
 155         /* A null pointer is an invalid argument for "%lU", but in practice
 156            it occurs quite frequently in printf statements that produce
 157            debug output.  Use a fallback in this case.  */
 158         if (ap->a.a_u16_string == NULL)
 159           {
 160             static const uint16_t u16_null_string[] =
 161               { '(', 'N', 'U', 'L', 'L', ')', 0 };
 162             ap->a.a_u16_string = u16_null_string;
 163           }
 164         break;
 165       case TYPE_U32_STRING:
 166         ap->a.a_u32_string = va_arg (args, const uint32_t *);
 167         /* A null pointer is an invalid argument for "%llU", but in practice
 168            it occurs quite frequently in printf statements that produce
 169            debug output.  Use a fallback in this case.  */
 170         if (ap->a.a_u32_string == NULL)
 171           {
 172             static const uint32_t u32_null_string[] =
 173               { '(', 'N', 'U', 'L', 'L', ')', 0 };
 174             ap->a.a_u32_string = u32_null_string;
 175           }
 176         break;
 177 #endif
 178       default:
 179         /* Unknown type.  */
 180         return -1;
 181       }
 182   return 0;
 183 }