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
|
/* A more useful interface to strtol.
Copyright (C) 1995-1996, 1998-2001, 2003-2007, 2009-2021 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 of the License, 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/>. */
/* Written by Jim Meyering. */
#ifndef __strtol
# define __strtol strtol
# define __strtol_t long int
# define __xstrtol xstrtol
# define STRTOL_T_MINIMUM LONG_MIN
# define STRTOL_T_MAXIMUM LONG_MAX
#endif
#include <config.h>
#include "xstrtol.h"
/* Some pre-ANSI implementations (e.g. SunOS 4)
need stderr defined if assertion checking is enabled. */
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "assure.h"
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
static strtol_error
bkm_scale (__strtol_t *x, int scale_factor)
{
if (TYPE_SIGNED (__strtol_t) && *x < STRTOL_T_MINIMUM / scale_factor)
{
*x = STRTOL_T_MINIMUM;
return LONGINT_OVERFLOW;
}
if (STRTOL_T_MAXIMUM / scale_factor < *x)
{
*x = STRTOL_T_MAXIMUM;
return LONGINT_OVERFLOW;
}
*x *= scale_factor;
return LONGINT_OK;
}
static strtol_error
bkm_scale_by_power (__strtol_t *x, int base, int power)
{
strtol_error err = LONGINT_OK;
while (power--)
err |= bkm_scale (x, base);
return err;
}
/* FIXME: comment. */
strtol_error
__xstrtol (const char *s, char **ptr, int strtol_base,
__strtol_t *val, const char *valid_suffixes)
{
char *t_ptr;
char **p;
__strtol_t tmp;
strtol_error err = LONGINT_OK;
assure (0 <= strtol_base && strtol_base <= 36);
p = (ptr ? ptr : &t_ptr);
errno = 0;
if (! TYPE_SIGNED (__strtol_t))
{
const char *q = s;
unsigned char ch = *q;
while (isspace (ch))
ch = *++q;
if (ch == '-')
return LONGINT_INVALID;
}
tmp = __strtol (s, p, strtol_base);
if (*p == s)
{
/* If there is no number but there is a valid suffix, assume the
number is 1. The string is invalid otherwise. */
if (valid_suffixes && **p && strchr (valid_suffixes, **p))
tmp = 1;
else
return LONGINT_INVALID;
}
else if (errno != 0)
{
if (errno != ERANGE)
return LONGINT_INVALID;
err = LONGINT_OVERFLOW;
}
/* Let valid_suffixes == NULL mean "allow any suffix". */
/* FIXME: update all callers except the ones that allow suffixes
after the number, changing last parameter NULL to "". */
if (!valid_suffixes)
{
*val = tmp;
return err;
}
if (**p != '\0')
{
int base = 1024;
int suffixes = 1;
strtol_error overflow;
if (!strchr (valid_suffixes, **p))
{
*val = tmp;
return err | LONGINT_INVALID_SUFFIX_CHAR;
}
switch (**p)
{
case 'E': case 'G': case 'g': case 'k': case 'K': case 'M': case 'm':
case 'P': case 'T': case 't': case 'Y': case 'Z':
/* The "valid suffix" '0' is a special flag meaning that
an optional second suffix is allowed, which can change
the base. A suffix "B" (e.g. "100MB") stands for a power
of 1000, whereas a suffix "iB" (e.g. "100MiB") stands for
a power of 1024. If no suffix (e.g. "100M"), assume
power-of-1024. */
if (strchr (valid_suffixes, '0'))
switch (p[0][1])
{
case 'i':
if (p[0][2] == 'B')
suffixes += 2;
break;
case 'B':
case 'D': /* 'D' is obsolescent */
base = 1000;
suffixes++;
break;
}
}
switch (**p)
{
case 'b':
overflow = bkm_scale (&tmp, 512);
break;
case 'B':
/* This obsolescent first suffix is distinct from the 'B'
second suffix above. E.g., 'tar -L 1000B' means change
the tape after writing 1000 KiB of data. */
overflow = bkm_scale (&tmp, 1024);
break;
case 'c':
overflow = LONGINT_OK;
break;
case 'E': /* exa or exbi */
overflow = bkm_scale_by_power (&tmp, base, 6);
break;
case 'G': /* giga or gibi */
case 'g': /* 'g' is undocumented; for compatibility only */
overflow = bkm_scale_by_power (&tmp, base, 3);
break;
case 'k': /* kilo */
case 'K': /* kibi */
overflow = bkm_scale_by_power (&tmp, base, 1);
break;
case 'M': /* mega or mebi */
case 'm': /* 'm' is undocumented; for compatibility only */
overflow = bkm_scale_by_power (&tmp, base, 2);
break;
case 'P': /* peta or pebi */
overflow = bkm_scale_by_power (&tmp, base, 5);
break;
case 'T': /* tera or tebi */
case 't': /* 't' is undocumented; for compatibility only */
overflow = bkm_scale_by_power (&tmp, base, 4);
break;
case 'w':
overflow = bkm_scale (&tmp, 2);
break;
case 'Y': /* yotta or 2**80 */
overflow = bkm_scale_by_power (&tmp, base, 8);
break;
case 'Z': /* zetta or 2**70 */
overflow = bkm_scale_by_power (&tmp, base, 7);
break;
default:
*val = tmp;
return err | LONGINT_INVALID_SUFFIX_CHAR;
}
err |= overflow;
*p += suffixes;
if (**p)
err |= LONGINT_INVALID_SUFFIX_CHAR;
}
*val = tmp;
return err;
}
|
