about summary refs log tree commit diff
path: root/stdio-common/reg-modifier.c
blob: 8a358f63ba190d2b304742af048e72bee30588c1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
/* Copyright (C) 2009-2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <limits.h>
#include <printf.h>
#include <stdlib.h>
#include <wchar.h>
#include <bits/libc-lock.h>


struct printf_modifier_record
{
  struct printf_modifier_record *next;
  int bit;
  wchar_t str[0];
};

struct printf_modifier_record **__printf_modifier_table attribute_hidden;

__libc_lock_define_initialized (static, lock)

/* Bits to hand out.  */
static int next_bit;


int
__register_printf_modifier (const wchar_t *str)
{
  if (str[0] == L'\0')
    {
    einval:
      __set_errno (EINVAL);
      return -1;
    }

  const wchar_t *wc = str;
  while (*wc != L'\0')
    if (*wc < 0 || *wc > (wchar_t) UCHAR_MAX)
      goto einval;
    else
      ++wc;

  if (next_bit / 8 == sizeof (((struct printf_info *) NULL)->user))
    {
      __set_errno (ENOSPC);
      return -1;
    }

  int result = -1;
  __libc_lock_lock (lock);

  if (__printf_modifier_table == NULL)
    {
      __printf_modifier_table = calloc (UCHAR_MAX,
					sizeof (*__printf_modifier_table));
      if (__printf_modifier_table == NULL)
	goto out;
    }

  /* Create enough room for the string.  But we don't need the first
     character. */
  struct printf_modifier_record *newp = malloc (sizeof (*newp)
						+ ((wc - str)
						   * sizeof (wchar_t)));
  if (newp == NULL)
    goto out;

  newp->next = __printf_modifier_table[(unsigned char) *str];
  newp->bit = 1 << next_bit++;
  __wmemcpy (newp->str, str + 1, wc - str);

  __printf_modifier_table[(unsigned char) *str] = newp;

  result = newp->bit;

 out:
  __libc_lock_unlock (lock);

  return result;
}
weak_alias (__register_printf_modifier, register_printf_modifier)


#include <stdio.h>
int
attribute_hidden
__handle_registered_modifier_mb (const unsigned char **format,
				 struct printf_info *info)
{
  struct printf_modifier_record *runp = __printf_modifier_table[**format];

  int best_bit = 0;
  int best_len = 0;
  const unsigned char *best_cp = NULL;

  while (runp != NULL)
    {
      const unsigned char *cp = *format + 1;
      wchar_t *fcp = runp->str;

      while (*cp != '\0' && *fcp != L'\0')
	if (*cp != *fcp)
	  break;
	else
	  ++cp, ++fcp;

      if (*fcp == L'\0' && cp - *format > best_len)
	{
	  best_cp = cp;
	  best_len = cp - *format;
	  best_bit = runp->bit;
	}

      runp = runp->next;
    }

  if (best_bit != 0)
    {
      info->user |= best_bit;
      *format = best_cp;
      return 0;
    }

  return 1;
}


int
attribute_hidden
__handle_registered_modifier_wc (const unsigned int **format,
				 struct printf_info *info)
{
  struct printf_modifier_record *runp = __printf_modifier_table[**format];

  int best_bit = 0;
  int best_len = 0;
  const unsigned int *best_cp = NULL;

  while (runp != NULL)
    {
      const unsigned int *cp = *format + 1;
      wchar_t *fcp = runp->str;

      while (*cp != '\0' && *fcp != L'\0')
	if (*cp != *fcp)
	  break;
	else
	  ++cp, ++fcp;

      if (*fcp == L'\0' && cp - *format > best_len)
	{
	  best_cp = cp;
	  best_len = cp - *format;
	  best_bit = runp->bit;
	}

      runp = runp->next;
    }

  if (best_bit != 0)
    {
      info->user |= best_bit;
      *format = best_cp;
      return 0;
    }

  return 1;
}


libc_freeres_fn (free_mem)
{
  if (__printf_modifier_table != NULL)
    {
      for (int i = 0; i < UCHAR_MAX; ++i)
	{
	  struct printf_modifier_record *runp = __printf_modifier_table[i];
	  while (runp != NULL)
	    {
	      struct printf_modifier_record *oldp = runp;
	      runp = runp->next;
	      free (oldp);
	    }
	}
      free (__printf_modifier_table);
    }
}