.
[glibc/history.git] / stdio-common / reg-modifier.c
blobea3bdada134d77db6b8dcb8c82a833cbdd9dd940
1 /* Copyright (C) 2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
19 #include <errno.h>
20 #include <limits.h>
21 #include <printf.h>
22 #include <wchar.h>
23 #include <bits/libc-lock.h>
26 struct printf_modifier_record
28 struct printf_modifier_record *next;
29 int bit;
30 wchar_t str[0];
33 struct printf_modifier_record **__printf_modifier_table attribute_hidden;
35 __libc_lock_define_initialized (static, lock)
37 /* Bits to hand out. */
38 static int next_bit;
41 int
42 __register_printf_modifier (const wchar_t *str)
44 if (str[0] == L'\0')
46 einval:
47 __set_errno (EINVAL);
48 return -1;
51 const wchar_t *wc = str;
52 while (*wc != L'\0')
53 if (*wc < 0 || *wc > (wchar_t) UCHAR_MAX)
54 goto einval;
55 else
56 ++wc;
58 if (next_bit / 8 == sizeof (((struct printf_info *) NULL)->user))
60 __set_errno (ENOSPC);
61 return -1;
64 int result = -1;
65 __libc_lock_lock (lock);
67 if (__printf_modifier_table == NULL)
69 __printf_modifier_table = calloc (UCHAR_MAX,
70 sizeof (*__printf_modifier_table));
71 if (__printf_modifier_table == NULL)
72 goto out;
75 /* Create enough room for the string. But we don't need the first
76 character. */
77 struct printf_modifier_record *newp = malloc (sizeof (*newp)
78 + ((wc - str)
79 * sizeof (wchar_t)));
80 if (newp == NULL)
81 goto out;
83 newp->next = __printf_modifier_table[(unsigned char) *str];
84 newp->bit = 1 << next_bit++;
85 __wmemcpy (newp->str, str + 1, wc - str);
87 __printf_modifier_table[(unsigned char) *str] = newp;
89 result = newp->bit;
91 out:
92 __libc_lock_unlock (lock);
94 return result;
96 weak_alias (__register_printf_modifier, register_printf_modifier)
99 #include <stdio.h>
101 attribute_hidden
102 __handle_registered_modifier_mb (const unsigned char **format,
103 struct printf_info *info)
105 struct printf_modifier_record *runp = __printf_modifier_table[**format];
107 int best_bit = 0;
108 int best_len = 0;
109 const unsigned char *best_cp = NULL;
111 while (runp != NULL)
113 const unsigned char *cp = *format + 1;
114 wchar_t *fcp = runp->str;
116 while (*cp != '\0' && *fcp != L'\0')
117 if (*cp != *fcp)
118 break;
119 else
120 ++cp, ++fcp;
122 if (*fcp == L'\0' && cp - *format > best_len)
124 best_cp = cp;
125 best_len = cp - *format;
126 best_bit = runp->bit;
129 runp = runp->next;
132 if (best_bit != 0)
134 info->user |= best_bit;
135 *format = best_cp;
136 return 0;
139 return 1;
144 attribute_hidden
145 __handle_registered_modifier_wc (const unsigned int **format,
146 struct printf_info *info)
148 struct printf_modifier_record *runp = __printf_modifier_table[**format];
150 int best_bit = 0;
151 int best_len = 0;
152 const unsigned int *best_cp = NULL;
154 while (runp != NULL)
156 const unsigned int *cp = *format + 1;
157 wchar_t *fcp = runp->str;
159 while (*cp != '\0' && *fcp != L'\0')
160 if (*cp != *fcp)
161 break;
162 else
163 ++cp, ++fcp;
165 if (*fcp == L'\0' && cp - *format > best_len)
167 best_cp = cp;
168 best_len = cp - *format;
169 best_bit = runp->bit;
172 runp = runp->next;
175 if (best_bit != 0)
177 info->user |= best_bit;
178 *format = best_cp;
179 return 0;
182 return 1;
186 libc_freeres_fn (free_mem)
188 if (__printf_modifier_table != NULL)
190 for (int i = 0; i < UCHAR_MAX; ++i)
192 struct printf_modifier_record *runp = __printf_modifier_table[i];
193 while (runp != NULL)
195 struct printf_modifier_record *oldp = runp;
196 runp = runp->next;
197 free (oldp);
200 free (__printf_modifier_table);