stdio-common/printf-prs.c

   1 /* Copyright (C) 1991, 1992, 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <stdio.h>
  20 #include <printf.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 #include "printf-parse.h"
  25
  26
  27 size_t
  28 parse_printf_format (fmt, n, argtypes)
  29       const char *fmt;
  30       size_t n;
  31       int *argtypes;
  32 {
  33   size_t nargs;                 /* Number of arguments.  */
  34   size_t max_ref_arg;           /* Highest index used in a positional arg.  */
  35   struct printf_spec spec;
  36
  37   nargs = 0;
  38   max_ref_arg = 0;
  39
  40   /* Search for format specifications.  */
  41   for (fmt = find_spec (fmt); *fmt != '\0'; fmt = spec.next_fmt)
  42     {
  43       /* Parse this spec.  */
  44       nargs += parse_one_spec (fmt, nargs, &spec, &max_ref_arg);
  45
  46       /* If the width is determined by an argument this is an int.  */
  47       if (spec.width_arg != -1 && spec.width_arg < n)
  48         argtypes[spec.width_arg] = PA_INT;
  49
  50       /* If the precision is determined by an argument this is an int.  */
  51       if (spec.prec_arg != -1 && spec.prec_arg < n)
  52         argtypes[spec.prec_arg] = PA_INT;
  53
  54       if (spec.data_arg < n)
  55         switch (spec.ndata_args)
  56           {
  57           case 0:               /* No arguments.  */
  58             break;
  59           case 1:               /* One argument; we already have the type.  */
  60             argtypes[spec.data_arg] = spec.data_arg_type;
  61             break;
  62           default:
  63             /* We have more than one argument for this format spec.  We must
  64                call the arginfo function again to determine all the types.  */
  65             (void) (*__printf_arginfo_table[spec.info.spec])
  66               (&spec.info, n - spec.data_arg, &argtypes[spec.data_arg]);
  67             break;
  68           }
  69     }
  70
  71   return MAX (nargs, max_ref_arg);
  72 }