1 /* A more useful interface to strtol.
2 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program 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
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
17
18 /* Jim Meyering (meyering@na-net.ornl.gov) */
19
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23
24 #ifdef STDC_HEADERS
25 #include <stdlib.h>
26 #endif
27
28 #ifdef HAVE_STRING_H
29 # include <string.h>
30 #else
31 # include <strings.h>
32 # ifndef strchr
33 # define strchr index
34 # endif
35 #endif
36
37 #define NDEBUG
38 #include <assert.h>
39
40 #include <errno.h>
41 #ifndef errno
42 extern int errno;
43 #endif
44
45 #if HAVE_LIMITS_H
46 # include <limits.h>
47 #endif
48
49 #ifndef ULONG_MAX
50 # define ULONG_MAX ((unsigned long) ~(unsigned long) 0)
51 #endif
52
53 #ifndef LONG_MAX
54 # define LONG_MAX ((long int) (ULONG_MAX >> 1))
55 #endif
56
57 #include "xstrtol.h"
58
59 #define BKM_SCALE(x, scale_factor, error_return) \
60 do \
61 { \
62 if ((x) > (double) __ZLONG_MAX / (scale_factor)) \
63 return (error_return); \
64 (x) *= (scale_factor); \
65 } \
66 while (0)
67
68 __unsigned long int __strtol ();
69
70 /* FIXME: comment. */
71
72 strtol_error
__xstrtol(s,ptr,base,val,valid_suffixes)73 __xstrtol (s, ptr, base, val, valid_suffixes)
74 const char *s;
75 char **ptr;
76 int base;
77 __unsigned long int *val;
78 const char *valid_suffixes;
79 {
80 char *t_ptr;
81 char **p;
82 __unsigned long int tmp;
83
84 assert (0 <= base && base <= 36);
85
86 p = (ptr ? ptr : &t_ptr);
87
88 errno = 0;
89 tmp = __strtol (s, p, base);
90 if (errno != 0)
91 return LONGINT_OVERFLOW;
92 if (*p == s)
93 return LONGINT_INVALID;
94 if (!valid_suffixes)
95 {
96 if (**p == '\0')
97 {
98 *val = tmp;
99 return LONGINT_OK;
100 }
101 else
102 return LONGINT_INVALID_SUFFIX_CHAR;
103 }
104
105 if (**p != '\0' && strchr (valid_suffixes, **p))
106 {
107 switch (**p)
108 {
109 case 'b':
110 BKM_SCALE (tmp, 512, LONGINT_OVERFLOW);
111 ++(*p);
112 break;
113
114 case 'c':
115 ++(*p);
116 break;
117
118 case 'B':
119 case 'k':
120 BKM_SCALE (tmp, 1024, LONGINT_OVERFLOW);
121 ++(*p);
122 break;
123
124 case 'm':
125 BKM_SCALE (tmp, 1024 * 1024, LONGINT_OVERFLOW);
126 ++(*p);
127 break;
128
129 case 'w':
130 BKM_SCALE (tmp, 2, LONGINT_OVERFLOW);
131 ++(*p);
132 break;
133
134 default:
135 return LONGINT_INVALID_SUFFIX_CHAR;
136 break;
137 }
138 }
139
140 *val = tmp;
141 return LONGINT_OK;
142 }
143
144 #ifdef TESTING_XSTRTO
145
146 #include <stdio.h>
147 #include "error.h"
148
149 char *program_name;
150
151 int
main(int argc,char ** argv)152 main (int argc, char** argv)
153 {
154 strtol_error s_err;
155 int i;
156
157 program_name = argv[0];
158 for (i=1; i<argc; i++)
159 {
160 char *p;
161 __unsigned long int val;
162
163 s_err = __xstrtol (argv[i], &p, 0, &val, "bckmw");
164 if (s_err == LONGINT_OK)
165 {
166 printf ("%s->%lu (%s)\n", argv[i], val, p);
167 }
168 else
169 {
170 STRTOL_FATAL_ERROR (argv[i], "arg", s_err);
171 }
172 }
173 exit (0);
174 }
175 #endif /* TESTING_XSTRTO */
176