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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/* strfmon_l override.
Copyright (C) 2017-2020 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <monetary.h>
#include <errno.h>
#include <locale.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#undef strfmon_l
/* This override can only support a limited number of arguments. */
#define MAX_ARGS 16
/* A parsed directive. */
typedef struct
{
bool needs_long_double;
const char *conversion_ptr;
}
directive_t;
/* A parsed format string. */
typedef struct
{
size_t count;
directive_t dir[MAX_ARGS];
}
directives_t;
/* Parses a monetary format string.
Returns 0 and fills *DIRECTIVESP if valid.
Returns -1 if invalid. */
static int
fmon_parse (const char *format, directives_t *directivesp)
{
size_t count = 0;
const char *cp = format;
while (*cp != '\0')
{
if (*cp++ == '%')
{
/* Parse flags. */
while (*cp == '=' || *cp == '^' || *cp == '+' || *cp == '('
|| *cp == '!' || *cp == '-')
{
if (*cp == '=')
{
cp++;
if (*cp == '\0')
return -1;
}
cp++;
}
/* Parse field width. */
while (*cp >= '0' && *cp <= '9')
cp++;
/* Parse left precision. */
if (*cp == '#')
{
cp++;
while (*cp >= '0' && *cp <= '9')
cp++;
}
/* Parse right precision. */
if (*cp == '.')
{
cp++;
while (*cp >= '0' && *cp <= '9')
cp++;
}
/* Now comes the conversion specifier. */
if (*cp != '%')
{
if (count == MAX_ARGS)
/* Too many arguments. */
return -1;
/* glibc supports an 'L' modifier before the conversion specifier. */
if (*cp == 'L')
{
cp++;
directivesp->dir[count].needs_long_double = true;
}
else
directivesp->dir[count].needs_long_double = false;
if (!(*cp == 'i' || *cp == 'n'))
return -1;
directivesp->dir[count].conversion_ptr = cp;
count++;
}
cp++;
}
}
directivesp->count = count;
return 0;
}
ssize_t
rpl_strfmon_l (char *s, size_t maxsize, locale_t locale, const char *format, ...)
{
/* Work around glibc 2.23 bug
<https://sourceware.org/bugzilla/show_bug.cgi?id=19633>. */
va_list argptr;
locale_t orig_locale;
directives_t directives;
ssize_t result;
orig_locale = uselocale ((locale_t)0);
if (uselocale (locale) == (locale_t)0)
/* errno is set. */
return -1;
/* The format string may consume 'double' or 'long double' arguments.
In order not to have to link with libffcall or libffi, convert all
arguments to 'long double', and use a modified format string that
requests 'long double' arguments. But since 'long double' arguments
are only supported on glibc, do so only if the original format string
consumes at least one 'long double' argument. */
if (fmon_parse (format, &directives) < 0)
{
errno = EINVAL;
result = -1;
}
else
{
bool use_long_double;
unsigned int i;
use_long_double = false;
for (i = 0; i < directives.count; i++)
if (directives.dir[i].needs_long_double)
{
use_long_double = true;
break;
}
va_start (argptr, format);
if (use_long_double)
{
char *ld_format;
/* Allocate room for the modified format string. */
ld_format = (char *) malloc (strlen (format) + directives.count + 1);
if (ld_format == NULL)
{
errno = ENOMEM;
result = -1;
}
else
{
long double args[MAX_ARGS];
/* Create the modified format string. */
{
const char *p = format;
char *dest = ld_format;
for (i = 0; i < directives.count; i++)
{
const char *q = directives.dir[i].conversion_ptr;
memcpy (dest, p, q - p);
dest += q - p;
if (!directives.dir[i].needs_long_double)
*dest++ = 'L';
p = q;
}
strcpy (dest, p);
}
/* Set up arguments array. */
for (i = 0; i < directives.count; i++)
args[i] = (directives.dir[i].needs_long_double
? va_arg (argptr, long double)
: (long double) va_arg (argptr, double));
/* Avoid uninitialized memory references. */
for (; i < MAX_ARGS; i++)
args[i] = 0.0L;
result = strfmon_l (s, maxsize, locale, ld_format,
args[0], args[1], args[2], args[3], args[4],
args[5], args[6], args[7], args[8], args[9],
args[10], args[11], args[12], args[13],
args[14], args[15]);
free (ld_format);
}
}
else
{
double args[MAX_ARGS];
/* Set up arguments array. */
for (i = 0; i < directives.count; i++)
args[i] = va_arg (argptr, double);
/* Avoid uninitialized memory references. */
for (; i < MAX_ARGS; i++)
args[i] = 0.0;
result = strfmon_l (s, maxsize, locale, format,
args[0], args[1], args[2], args[3], args[4],
args[5], args[6], args[7], args[8], args[9],
args[10], args[11], args[12], args[13], args[14],
args[15]);
}
va_end (argptr);
}
if (uselocale (orig_locale) == (locale_t)0)
/* errno is set. */
return -1;
return result;
}
|
