stdio-common/printf-prs.c

   1 /* Copyright (C) 1991-2019 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <printf.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <wchar.h>
  23 #include <sys/param.h>
  24
  25 #include "../locale/localeinfo.h"
  26
  27 #ifndef COMPILE_WPRINTF
  28 # define CHAR_T         char
  29 # define UCHAR_T        unsigned char
  30 # define INT_T          int
  31 # define L_(Str)        Str
  32 # define ISDIGIT(Ch)    isdigit (Ch)
  33 # define ISASCII(Ch)    isascii (Ch)
  34 # define MBRLEN(Cp, L, St) __mbrlen (Cp, L, St)
  35
  36 # define PUT(F, S, N)   _IO_sputn (F, S, N)
  37 # define PAD(Padchar)                                                         \
  38   if (width > 0)                                                              \
  39     done += _IO_padn (s, Padchar, width)
  40 #else
  41 # define vfprintf       vfwprintf
  42 # define CHAR_T         wchar_t
  43 # define UCHAR_T        uwchar_t
  44 # define INT_T          wint_t
  45 # define L_(Str)        L##Str
  46 # define ISDIGIT(Ch)    iswdigit (Ch)
  47
  48 # define PUT(F, S, N)   _IO_sputn (F, S, N)
  49 # define PAD(Padchar)                                                         \
  50   if (width > 0)                                                              \
  51     done += _IO_wpadn (s, Padchar, width)
  52 #endif
  53
  54 #define DONT_NEED_READ_INT
  55 #include "printf-parse.h"
  56
  57
  58 size_t
  59 parse_printf_format (const char *fmt, size_t n, int *argtypes)
  60 {
  61   size_t nargs;                 /* Number of arguments.  */
  62   size_t max_ref_arg;           /* Highest index used in a positional arg.  */
  63   struct printf_spec spec;
  64   const unsigned char *f = (const unsigned char *) fmt;
  65
  66   nargs = 0;
  67   max_ref_arg = 0;
  68
  69   /* Search for format specifications.  */
  70   for (f = __find_specmb (f); *f != '\0'; f = spec.next_fmt)
  71     {
  72       /* Parse this spec.  */
  73       nargs += __parse_one_specmb (f, nargs, &spec, &max_ref_arg);
  74
  75       /* If the width is determined by an argument this is an int.  */
  76       if (spec.width_arg != -1 && (size_t) spec.width_arg < n)
  77         argtypes[spec.width_arg] = PA_INT;
  78
  79       /* If the precision is determined by an argument this is an int.  */
  80       if (spec.prec_arg != -1 && (size_t) spec.prec_arg < n)
  81         argtypes[spec.prec_arg] = PA_INT;
  82
  83       if ((size_t) spec.data_arg < n)
  84         switch (spec.ndata_args)
  85           {
  86           case 0:               /* No arguments.  */
  87             break;
  88           case 1:               /* One argument; we already have the type.  */
  89             argtypes[spec.data_arg] = spec.data_arg_type;
  90             break;
  91           default:
  92             /* We have more than one argument for this format spec.  We must
  93                call the arginfo function again to determine all the types.  */
  94             (void) (*__printf_arginfo_table[spec.info.spec])
  95               (&spec.info, n - spec.data_arg, &argtypes[spec.data_arg],
  96                &spec.size);
  97             break;
  98           }
  99     }
 100
 101   return MAX (nargs, max_ref_arg);
 102 }