1 /* Copyright (C) 1991-2021 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
parse_printf_format(const char * fmt,size_t n,int * argtypes)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, it 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, it 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 }
103