1 /* Copyright (C) 1991-1993,1995-1999,2000,2001 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19 #ifndef _PRINTF_H 20 21 #define _PRINTF_H 1 22 #include <features.h> 23 24 __BEGIN_DECLS 25 26 #define __need_FILE 27 #include <stdio.h> 28 #define __need_size_t 29 #define __need_wchar_t 30 #include <stddef.h> 31 32 33 struct printf_info 34 { 35 int prec; /* Precision. */ 36 int width; /* Width. */ 37 wchar_t spec; /* Format letter. */ 38 unsigned int is_long_double:1;/* L flag. */ 39 unsigned int is_short:1; /* h flag. */ 40 unsigned int is_long:1; /* l flag. */ 41 unsigned int alt:1; /* # flag. */ 42 unsigned int space:1; /* Space flag. */ 43 unsigned int left:1; /* - flag. */ 44 unsigned int showsign:1; /* + flag. */ 45 unsigned int group:1; /* ' flag. */ 46 unsigned int extra:1; /* For special use. */ 47 unsigned int is_char:1; /* hh flag. */ 48 unsigned int wide:1; /* Nonzero for wide character streams. */ 49 unsigned int i18n:1; /* I flag. */ 50 wchar_t pad; /* Padding character. */ 51 }; 52 53 54 /* Type of a printf specifier-handler function. 55 STREAM is the FILE on which to write output. 56 INFO gives information about the format specification. 57 ARGS is a vector of pointers to the argument data; 58 the number of pointers will be the number returned 59 by the associated arginfo function for the same INFO. 60 61 The function should return the number of characters written, 62 or -1 for errors. */ 63 64 typedef int printf_function (FILE *__stream, 65 __const struct printf_info *__info, 66 __const void *__const *__args); 67 68 /* Type of a printf specifier-arginfo function. 69 INFO gives information about the format specification. 70 N, ARGTYPES, and return value are as for parse_printf_format. */ 71 72 typedef int printf_arginfo_function (__const struct printf_info *__info, 73 size_t __n, int *__argtypes); 74 75 76 /* Register FUNC to be called to format SPEC specifiers; ARGINFO must be 77 specified to determine how many arguments a SPEC conversion requires and 78 what their types are. */ 79 80 extern int register_printf_function (int __spec, printf_function __func, 81 printf_arginfo_function __arginfo); 82 83 84 /* Parse FMT, and fill in N elements of ARGTYPES with the 85 types needed for the conversions FMT specifies. Returns 86 the number of arguments required by FMT. 87 88 The ARGINFO function registered with a user-defined format is passed a 89 `struct printf_info' describing the format spec being parsed. A width 90 or precision of INT_MIN means a `*' was used to indicate that the 91 width/precision will come from an arg. The function should fill in the 92 array it is passed with the types of the arguments it wants, and return 93 the number of arguments it wants. */ 94 95 extern size_t parse_printf_format (__const char *__restrict __fmt, size_t __n, 96 int *__restrict __argtypes) __THROW; 97 98 99 /* Codes returned by `parse_printf_format' for basic types. 100 101 These values cover all the standard format specifications. 102 Users can add new values after PA_LAST for their own types. */ 103 104 enum 105 { /* C type: */ 106 PA_INT, /* int */ 107 PA_CHAR, /* int, cast to char */ 108 PA_WCHAR, /* wide char */ 109 PA_STRING, /* const char *, a '\0'-terminated string */ 110 PA_WSTRING, /* const wchar_t *, wide character string */ 111 PA_POINTER, /* void * */ 112 PA_FLOAT, /* float */ 113 PA_DOUBLE, /* double */ 114 PA_LAST 115 }; 116 117 /* Flag bits that can be set in a type returned by `parse_printf_format'. */ 118 #define PA_FLAG_MASK 0xff00 119 #define PA_FLAG_LONG_LONG (1 << 8) 120 #define PA_FLAG_LONG_DOUBLE PA_FLAG_LONG_LONG 121 #define PA_FLAG_LONG (1 << 9) 122 #define PA_FLAG_SHORT (1 << 10) 123 #define PA_FLAG_PTR (1 << 11) 124 125 126 127 /* Function which can be registered as `printf'-handlers. */ 128 129 /* Print floating point value using using abbreviations for the orders 130 of magnitude used for numbers ('k' for kilo, 'm' for mega etc). If 131 the format specifier is a uppercase character powers of 1000 are 132 used. Otherwise powers of 1024. */ 133 extern int printf_size (FILE *__restrict __fp, 134 __const struct printf_info *__info, 135 __const void *__const *__restrict __args) __THROW; 136 137 /* This is the appropriate argument information function for `printf_size'. */ 138 extern int printf_size_info (__const struct printf_info *__restrict 139 __info, size_t __n, int *__restrict __argtypes) 140 __THROW; 141 142 143 __END_DECLS 144 145 #endif /* printf.h */ 146