stdio-common/printf.h

   1 /* Copyright (C) 1991-1993,1995-1999,2000,2001,2006
   2         Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _PRINTF_H
  21
  22 #define _PRINTF_H       1
  23 #include <features.h>
  24
  25 __BEGIN_DECLS
  26
  27 #define __need_FILE
  28 #include <stdio.h>
  29 #define __need_size_t
  30 #define __need_wchar_t
  31 #include <stddef.h>
  32
  33
  34 struct printf_info
  35 {
  36   int prec;                     /* Precision.  */
  37   int width;                    /* Width.  */
  38   wchar_t spec;                 /* Format letter.  */
  39   unsigned int is_long_double:1;/* L flag.  */
  40   unsigned int is_short:1;      /* h flag.  */
  41   unsigned int is_long:1;       /* l flag.  */
  42   unsigned int alt:1;           /* # flag.  */
  43   unsigned int space:1;         /* Space flag.  */
  44   unsigned int left:1;          /* - flag.  */
  45   unsigned int showsign:1;      /* + flag.  */
  46   unsigned int group:1;         /* ' flag.  */
  47   unsigned int extra:1;         /* For special use.  */
  48   unsigned int is_char:1;       /* hh flag.  */
  49   unsigned int wide:1;          /* Nonzero for wide character streams.  */
  50   unsigned int i18n:1;          /* I flag.  */
  51   wchar_t pad;                  /* Padding character.  */
  52 };
  53
  54
  55 /* Type of a printf specifier-handler function.
  56    STREAM is the FILE on which to write output.
  57    INFO gives information about the format specification.
  58    ARGS is a vector of pointers to the argument data;
  59    the number of pointers will be the number returned
  60    by the associated arginfo function for the same INFO.
  61
  62    The function should return the number of characters written,
  63    or -1 for errors.  */
  64
  65 typedef int printf_function (FILE *__stream,
  66                              __const struct printf_info *__info,
  67                              __const void *__const *__args);
  68
  69 /* Type of a printf specifier-arginfo function.
  70    INFO gives information about the format specification.
  71    N, ARGTYPES, and return value are as for parse_printf_format.  */
  72
  73 typedef int printf_arginfo_function (__const struct printf_info *__info,
  74                                      size_t __n, int *__argtypes);
  75
  76
  77 /* Register FUNC to be called to format SPEC specifiers; ARGINFO must be
  78    specified to determine how many arguments a SPEC conversion requires and
  79    what their types are.  */
  80
  81 extern int register_printf_function (int __spec, printf_function __func,
  82                                      printf_arginfo_function __arginfo);
  83
  84
  85 /* Parse FMT, and fill in N elements of ARGTYPES with the
  86    types needed for the conversions FMT specifies.  Returns
  87    the number of arguments required by FMT.
  88
  89    The ARGINFO function registered with a user-defined format is passed a
  90    `struct printf_info' describing the format spec being parsed.  A width
  91    or precision of INT_MIN means a `*' was used to indicate that the
  92    width/precision will come from an arg.  The function should fill in the
  93    array it is passed with the types of the arguments it wants, and return
  94    the number of arguments it wants.  */
  95
  96 extern size_t parse_printf_format (__const char *__restrict __fmt, size_t __n,
  97                                    int *__restrict __argtypes) __THROW;
  98
  99
 100 /* Codes returned by `parse_printf_format' for basic types.
 101
 102    These values cover all the standard format specifications.
 103    Users can add new values after PA_LAST for their own types.  */
 104
 105 enum
 106 {                               /* C type: */
 107   PA_INT,                       /* int */
 108   PA_CHAR,                      /* int, cast to char */
 109   PA_WCHAR,                     /* wide char */
 110   PA_STRING,                    /* const char *, a '\0'-terminated string */
 111   PA_WSTRING,                   /* const wchar_t *, wide character string */
 112   PA_POINTER,                   /* void * */
 113   PA_FLOAT,                     /* float */
 114   PA_DOUBLE,                    /* double */
 115   PA_LAST
 116 };
 117
 118 /* Flag bits that can be set in a type returned by `parse_printf_format'.  */
 119 #define PA_FLAG_MASK            0xff00
 120 #define PA_FLAG_LONG_LONG       (1 << 8)
 121 #define PA_FLAG_LONG_DOUBLE     PA_FLAG_LONG_LONG
 122 #define PA_FLAG_LONG            (1 << 9)
 123 #define PA_FLAG_SHORT           (1 << 10)
 124 #define PA_FLAG_PTR             (1 << 11)
 125
 126
 127
 128 /* Function which can be registered as `printf'-handlers.  */
 129
 130 /* Print floating point value using using abbreviations for the orders
 131    of magnitude used for numbers ('k' for kilo, 'm' for mega etc).  If
 132    the format specifier is a uppercase character powers of 1000 are
 133    used.  Otherwise powers of 1024.  */
 134 extern int printf_size (FILE *__restrict __fp,
 135                         __const struct printf_info *__info,
 136                         __const void *__const *__restrict __args) __THROW;
 137
 138 /* This is the appropriate argument information function for `printf_size'.  */
 139 extern int printf_size_info (__const struct printf_info *__restrict
 140                              __info, size_t __n, int *__restrict __argtypes)
 141      __THROW;
 142
 143 #ifdef __LDBL_COMPAT
 144 # include <bits/printf-ldbl.h>
 145 #endif
 146
 147 __END_DECLS
 148
 149 #endif /* printf.h  */