summaryrefslogtreecommitdiff
path: root/lib/xstrtol.c
blob: e7b20618910bdecf7c5fbcdf87ac42b14c1b8192 (plain)
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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
/* A more useful interface to strtol.
   Copyright 1995, 1996, 1998, 1999 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 2, 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, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* Written by Jim Meyering. */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#ifndef __strtol
# define __strtol strtol
# define __strtol_t long int
# define __xstrtol xstrtol
#endif

/* Some pre-ANSI implementations (e.g. SunOS 4)
   need stderr defined if assertion checking is enabled.  */
#include <stdio.h>

#if STDC_HEADERS
# include <stdlib.h>
#endif

#if HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
# ifndef strchr
#  define strchr index
# endif
#endif

#include <assert.h>
#include <ctype.h>

#include <errno.h>
#ifndef errno
extern int errno;
#endif

#if HAVE_LIMITS_H
# include <limits.h>
#endif

#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif

/* The extra casts work around common compiler bugs.  */
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
   It is necessary at least when t == time_t.  */
#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
			      ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
#define TYPE_MAXIMUM(t) (~ (t) 0 - TYPE_MINIMUM (t))

#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
# define IN_CTYPE_DOMAIN(c) 1
#else
# define IN_CTYPE_DOMAIN(c) isascii(c)
#endif

#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))

#include "xstrtol.h"

#ifndef strtol
long int strtol ();
#endif

#ifndef strtoul
unsigned long int strtoul ();
#endif

#ifndef strtoumax
uintmax_t strtoumax ();
#endif

static int
bkm_scale (__strtol_t *x, int scale_factor)
{
  __strtol_t product = *x * scale_factor;
  if (*x != product / scale_factor)
    return 1;
  *x = product;
  return 0;
}

static int
bkm_scale_by_power (__strtol_t *x, int base, int power)
{
  while (power--)
    if (bkm_scale (x, base))
      return 1;

  return 0;
}

/* 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;

  assert (0 <= strtol_base && strtol_base <= 36);

  p = (ptr ? ptr : &t_ptr);

  if (! TYPE_SIGNED (__strtol_t))
    {
      const char *q = s;
      while (ISSPACE ((unsigned char) *q))
	++q;
      if (*q == '-')
	return LONGINT_INVALID;
    }

  errno = 0;
  tmp = __strtol (s, p, strtol_base);
  if (errno != 0)
    return LONGINT_OVERFLOW;
  if (*p == s)
    return LONGINT_INVALID;

  /* 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 LONGINT_OK;
    }

  if (**p != '\0')
    {
      int base = 1024;
      int suffixes = 1;
      int overflow;

      if (!strchr (valid_suffixes, **p))
	{
	  *val = tmp;
	  return LONGINT_INVALID_SUFFIX_CHAR;
	}

      if (strchr (valid_suffixes, '0'))
	{
	  /* The ``valid suffix'' '0' is a special flag meaning that
	     an optional second suffix is allowed, which can change
	     the base, e.g. "100MD" for 100 megabytes decimal.  */

	  switch (p[0][1])
	    {
	    case 'B':
	      suffixes++;
	      break;

	    case 'D':
	      base = 1000;
	      suffixes++;
	      break;
	    }
	}

      switch (**p)
	{
	case 'b':
	  overflow = bkm_scale (&tmp, 512);
	  break;

	case 'B':
	  overflow = bkm_scale (&tmp, 1024);
	  break;

	case 'c':
	  overflow = 0;
	  break;

	case 'E': /* Exa */
	  overflow = bkm_scale_by_power (&tmp, base, 6);
	  break;

	case 'G': /* Giga */
	  overflow = bkm_scale_by_power (&tmp, base, 3);
	  break;

	case 'k': /* kilo */
	  overflow = bkm_scale_by_power (&tmp, base, 1);
	  break;

	case 'M': /* Mega */
	case 'm': /* 'm' is undocumented; for backward compatibility only */
	  overflow = bkm_scale_by_power (&tmp, base, 2);
	  break;

	case 'P': /* Peta */
	  overflow = bkm_scale_by_power (&tmp, base, 5);
	  break;

	case 'T': /* Tera */
	  overflow = bkm_scale_by_power (&tmp, base, 4);
	  break;

	case 'w':
	  overflow = bkm_scale (&tmp, 2);
	  break;

	case 'Y': /* Yotta */
	  overflow = bkm_scale_by_power (&tmp, base, 8);
	  break;

	case 'Z': /* Zetta */
	  overflow = bkm_scale_by_power (&tmp, base, 7);
	  break;

	default:
	  *val = tmp;
	  return LONGINT_INVALID_SUFFIX_CHAR;
	  break;
	}

      if (overflow)
	return LONGINT_OVERFLOW;

      (*p) += suffixes;
    }

  *val = tmp;
  return LONGINT_OK;
}

#ifdef TESTING_XSTRTO

# include <stdio.h>
# include "error.h"

char *program_name;

int
main (int argc, char** argv)
{
  strtol_error s_err;
  int i;

  program_name = argv[0];
  for (i=1; i<argc; i++)
    {
      char *p;
      __strtol_t val;

      s_err = __xstrtol (argv[i], &p, 0, &val, "bckmw");
      if (s_err == LONGINT_OK)
	{
	  printf ("%s->%lu (%s)\n", argv[i], val, p);
	}
      else
	{
	  STRTOL_FATAL_ERROR (argv[i], "arg", s_err);
	}
    }
  exit (0);
}

#endif /* TESTING_XSTRTO */