stdio-common/printf-parse.h

   1 /* Internal header for parsing printf format strings.
   2    Copyright (C) 1995-1999, 2000, 2002, 2003, 2007
   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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <printf.h>
  22 #include <stdint.h>
  23 #include <stddef.h>
  24 #include <string.h>
  25 #include <wchar.h>
  26
  27
  28 struct printf_spec
  29   {
  30     /* Information parsed from the format spec.  */
  31     struct printf_info info;
  32
  33     /* Pointers into the format string for the end of this format
  34        spec and the next (or to the end of the string if no more).  */
  35     const UCHAR_T *end_of_fmt, *next_fmt;
  36
  37     /* Position of arguments for precision and width, or -1 if `info' has
  38        the constant value.  */
  39     int prec_arg, width_arg;
  40
  41     int data_arg;               /* Position of data argument.  */
  42     int data_arg_type;          /* Type of first argument.  */
  43     /* Number of arguments consumed by this format specifier.  */
  44     size_t ndata_args;
  45   };
  46
  47
  48 /* The various kinds off arguments that can be passed to printf.  */
  49 union printf_arg
  50   {
  51     wchar_t pa_wchar;
  52     int pa_int;
  53     long int pa_long_int;
  54     long long int pa_long_long_int;
  55     unsigned int pa_u_int;
  56     unsigned long int pa_u_long_int;
  57     unsigned long long int pa_u_long_long_int;
  58     double pa_double;
  59     long double pa_long_double;
  60     const char *pa_string;
  61     const wchar_t *pa_wstring;
  62     void *pa_pointer;
  63   };
  64
  65
  66 #ifndef DONT_NEED_READ_INT
  67 /* Read a simple integer from a string and update the string pointer.
  68    It is assumed that the first character is a digit.  */
  69 static unsigned int
  70 read_int (const UCHAR_T * *pstr)
  71 {
  72   unsigned int retval = **pstr - L_('0');
  73
  74   while (ISDIGIT (*++(*pstr)))
  75     {
  76       retval *= 10;
  77       retval += **pstr - L_('0');
  78     }
  79
  80   return retval;
  81 }
  82 #endif
  83
  84
  85 /* These are defined in reg-printf.c.  */
  86 extern printf_arginfo_function **__printf_arginfo_table attribute_hidden;
  87 extern printf_function **__printf_function_table attribute_hidden;
  88
  89
  90 /* Find the next spec in FORMAT, or the end of the string.  Returns
  91    a pointer into FORMAT, to a '%' or a '\0'.  */
  92 __extern_always_inline const unsigned char *
  93 __find_specmb (const unsigned char *format)
  94 {
  95   return (const unsigned char *) __strchrnul ((const char *) format, '%');
  96 }
  97
  98 __extern_always_inline const unsigned int *
  99 __find_specwc (const unsigned int *format)
 100 {
 101   return (const unsigned int *) __wcschrnul ((const wchar_t *) format, L'%');
 102 }
 103
 104
 105 /* FORMAT must point to a '%' at the beginning of a spec.  Fills in *SPEC
 106    with the parsed details.  POSN is the number of arguments already
 107    consumed.  At most MAXTYPES - POSN types are filled in TYPES.  Return
 108    the number of args consumed by this spec; *MAX_REF_ARG is updated so it
 109    remains the highest argument index used.  */
 110 extern size_t __parse_one_specmb (const unsigned char *format, size_t posn,
 111                                   struct printf_spec *spec,
 112                                   size_t *max_ref_arg) attribute_hidden;
 113
 114 extern size_t __parse_one_specwc (const unsigned int *format, size_t posn,
 115                                   struct printf_spec *spec,
 116                                   size_t *max_ref_arg) attribute_hidden;