stdio-common/printf-parse.h

   1 /* Internal header for parsing printf format strings.
   2    Copyright (C) 1995-1999, 2000, 2002, 2003, 2007, 2009
   3    Free Software Foundation, Inc.
   4    This file is part of th GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library 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    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <printf.h>
  21 #include <stdint.h>
  22 #include <stddef.h>
  23 #include <string.h>
  24 #include <wchar.h>
  25
  26
  27 struct printf_spec
  28   {
  29     /* Information parsed from the format spec.  */
  30     struct printf_info info;
  31
  32     /* Pointers into the format string for the end of this format
  33        spec and the next (or to the end of the string if no more).  */
  34     const UCHAR_T *end_of_fmt, *next_fmt;
  35
  36     /* Position of arguments for precision and width, or -1 if `info' has
  37        the constant value.  */
  38     int prec_arg, width_arg;
  39
  40     int data_arg;               /* Position of data argument.  */
  41     int data_arg_type;          /* Type of first argument.  */
  42     /* Number of arguments consumed by this format specifier.  */
  43     size_t ndata_args;
  44     /* Size of the parameter for PA_USER type.  */
  45     int size;
  46   };
  47
  48
  49 /* The various kinds off arguments that can be passed to printf.  */
  50 union printf_arg
  51   {
  52     wchar_t pa_wchar;
  53     int pa_int;
  54     long int pa_long_int;
  55     long long int pa_long_long_int;
  56     unsigned int pa_u_int;
  57     unsigned long int pa_u_long_int;
  58     unsigned long long int pa_u_long_long_int;
  59     double pa_double;
  60     long double pa_long_double;
  61     const char *pa_string;
  62     const wchar_t *pa_wstring;
  63     void *pa_pointer;
  64     void *pa_user;
  65   };
  66
  67
  68 #ifndef DONT_NEED_READ_INT
  69 /* Read a simple integer from a string and update the string pointer.
  70    It is assumed that the first character is a digit.  */
  71 static unsigned int
  72 read_int (const UCHAR_T * *pstr)
  73 {
  74   unsigned int retval = **pstr - L_('0');
  75
  76   while (ISDIGIT (*++(*pstr)))
  77     {
  78       retval *= 10;
  79       retval += **pstr - L_('0');
  80     }
  81
  82   return retval;
  83 }
  84 #endif
  85
  86
  87 /* These are defined in reg-printf.c.  */
  88 extern printf_arginfo_size_function **__printf_arginfo_table attribute_hidden;
  89 extern printf_function **__printf_function_table attribute_hidden;
  90 extern printf_va_arg_function **__printf_va_arg_table attribute_hidden;
  91
  92
  93 /* Find the next spec in FORMAT, or the end of the string.  Returns
  94    a pointer into FORMAT, to a '%' or a '\0'.  */
  95 __extern_always_inline const unsigned char *
  96 __find_specmb (const unsigned char *format)
  97 {
  98   return (const unsigned char *) __strchrnul ((const char *) format, '%');
  99 }
 100
 101 __extern_always_inline const unsigned int *
 102 __find_specwc (const unsigned int *format)
 103 {
 104   return (const unsigned int *) __wcschrnul ((const wchar_t *) format, L'%');
 105 }
 106
 107
 108 /* FORMAT must point to a '%' at the beginning of a spec.  Fills in *SPEC
 109    with the parsed details.  POSN is the number of arguments already
 110    consumed.  At most MAXTYPES - POSN types are filled in TYPES.  Return
 111    the number of args consumed by this spec; *MAX_REF_ARG is updated so it
 112    remains the highest argument index used.  */
 113 extern size_t __parse_one_specmb (const unsigned char *format, size_t posn,
 114                                   struct printf_spec *spec,
 115                                   size_t *max_ref_arg) attribute_hidden;
 116
 117 extern size_t __parse_one_specwc (const unsigned int *format, size_t posn,
 118                                   struct printf_spec *spec,
 119                                   size_t *max_ref_arg) attribute_hidden;
 120
 121
 122
 123 /* This variable is defined in reg-modifier.c.  */
 124 struct printf_modifier_record;
 125 extern struct printf_modifier_record **__printf_modifier_table
 126      attribute_hidden;
 127
 128 /* Handle registered modifiers.  */
 129 extern int __handle_registered_modifier_mb (const unsigned char **format,
 130                                             struct printf_info *info)
 131      attribute_hidden;
 132 extern int __handle_registered_modifier_wc (const unsigned int **format,
 133                                             struct printf_info *info)
 134      attribute_hidden;