summaryrefslogtreecommitdiff
path: root/stdlib/strtol.c
blob: 06639a763ade9188dc3f4dfd1e40dbe100aab4ae (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
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
/* Copyright (C) 1991, 92, 94, 95, 96 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

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

#ifdef _LIBC
# define USE_NUMBER_GROUPING
# define STDC_HEADERS
# define HAVE_LIMITS_H
#endif

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

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

#ifdef STDC_HEADERS
# include <stddef.h>
# include <stdlib.h>
# include <string.h>
#else
# ifndef NULL
#  define NULL 0
# endif
#endif

#ifdef USE_NUMBER_GROUPING
# include "../locale/localeinfo.h"
#endif

/* Nonzero if we are defining `strtoul' or `strtouq', operating on
   unsigned integers.  */
#ifndef UNSIGNED
# define UNSIGNED 0
# define INT LONG int
#else
# define INT unsigned LONG int
#endif

/* Determine the name.  */
#if UNSIGNED
# ifdef USE_WIDE_CHAR
#  ifdef QUAD
#   define strtol wcstouq
#  else
#   define strtol wcstoul
#  endif
# else
#  ifdef QUAD
#   define strtol strtouq
#  else
#   define strtol strtoul
#  endif
# endif
#else
# ifdef USE_WIDE_CHAR
#  ifdef QUAD
#   define strtol wcstoq
#  else
#   define strtol wcstol
#  endif
# else
#  ifdef QUAD
#   define strtol strtoq
#  endif
# endif
#endif

/* If QUAD is defined, we are defining `strtoq' or `strtouq',
   operating on `long long int's.  */
#ifdef QUAD
# define LONG long long
# undef LONG_MIN
# define LONG_MIN LONG_LONG_MIN
# undef LONG_MAX
# define LONG_MAX LONG_LONG_MAX
# undef ULONG_MAX
# define ULONG_MAX ULONG_LONG_MAX
# if __GNUC__ == 2 && __GNUC_MINOR__ < 7
   /* Work around gcc bug with using this constant.  */
   static const unsigned long long int maxquad = ULONG_LONG_MAX;
#  undef ULONG_MAX
#  define ULONG_MAX maxquad
# endif
#else
# define LONG long

#ifndef ULONG_MAX
# define ULONG_MAX ((unsigned long) ~(unsigned long) 0)
#endif
#ifndef LONG_MAX
# define LONG_MAX ((long int) (ULONG_MAX >> 1))
#endif
#endif

#ifdef USE_WIDE_CHAR
# include <wchar.h>
# include <wctype.h>
# define L_(ch) L##ch
# define UCHAR_TYPE wint_t
# define STRING_TYPE wchar_t
# define ISSPACE(ch) iswspace (ch)
# define ISALPHA(ch) iswalpha (ch)
# define TOUPPER(ch) towupper (ch)
#else
# define L_(ch) ch
# define UCHAR_TYPE unsigned char
# define STRING_TYPE char
# define ISSPACE(ch) isspace (ch)
# define ISALPHA(ch) isalpha (ch)
# define TOUPPER(ch) toupper (ch)
#endif

#ifdef __STDC__
# define INTERNAL(x) INTERNAL1(x)
# define INTERNAL1(x) __##x##_internal
# define WEAKNAME(x) WEAKNAME1(x)
#else
# define INTERNAL(x) __/**/x/**/_internal
#endif

#ifdef USE_NUMBER_GROUPING
/* This file defines a function to check for correct grouping.  */
# include "grouping.h"
#endif


/* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
   If BASE is 0 the base is determined by the presence of a leading
   zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
   If BASE is < 2 or > 36, it is reset to 10.
   If ENDPTR is not NULL, a pointer to the character after the last
   one converted is stored in *ENDPTR.  */

INT
INTERNAL (strtol) (nptr, endptr, base, group)
     const STRING_TYPE *nptr;
     STRING_TYPE **endptr;
     int base;
     int group;
{
  int negative;
  register unsigned LONG int cutoff;
  register unsigned int cutlim;
  register unsigned LONG int i;
  register const STRING_TYPE *s;
  register UCHAR_TYPE c;
  const STRING_TYPE *save, *end;
  int overflow;

#ifdef USE_NUMBER_GROUPING
  /* The thousands character of the current locale.  */
  wchar_t thousands;
  /* The numeric grouping specification of the current locale,
     in the format described in <locale.h>.  */
  const char *grouping;

  if (group)
    {
      grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
      if (*grouping <= 0 || *grouping == CHAR_MAX)
	grouping = NULL;
      else
	{
	  /* Figure out the thousands separator character.  */
	  if (mbtowc (&thousands, _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP),
		      strlen (_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP))) <= 0)
	    thousands = (wchar_t) *_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
	  if (thousands == L'\0')
	    grouping = NULL;
	}
    }
  else
    grouping = NULL;
#endif

  if (base < 0 || base == 1 || base > 36)
    base = 10;

  save = s = nptr;

  /* Skip white space.  */
  while (ISSPACE (*s))
    ++s;
  if (*s == L_('\0'))
    goto noconv;

  /* Check for a sign.  */
  if (*s == L_('-'))
    {
      negative = 1;
      ++s;
    }
  else if (*s == L_('+'))
    {
      negative = 0;
      ++s;
    }
  else
    negative = 0;

  if (base == 16 && s[0] == L_('0') && TOUPPER (s[1]) == L_('X'))
    s += 2;

  /* If BASE is zero, figure it out ourselves.  */
  if (base == 0)
    if (*s == L_('0'))
      {
	if (TOUPPER (s[1]) == L_('X'))
	  {
	    s += 2;
	    base = 16;
	  }
	else
	  base = 8;
      }
    else
      base = 10;

  /* Save the pointer so we can check later if anything happened.  */
  save = s;

#ifdef USE_NUMBER_GROUPING
  if (group)
    {
      /* Find the end of the digit string and check its grouping.  */
      end = s;
      for (c = *end; c != L_('\0'); c = *++end)
	if (c != thousands && (c < L_('0') || c > L_('9'))
	    && (!ISALPHA (c) || TOUPPER (c) - L_('A') + 10 >= base))
	  break;
      if (*s == thousands)
	end = s;
      else
	end = correctly_grouped_prefix (s, end, thousands, grouping);
    }
  else
#endif
    end = NULL;

  cutoff = ULONG_MAX / (unsigned LONG int) base;
  cutlim = ULONG_MAX % (unsigned LONG int) base;

  overflow = 0;
  i = 0;
  for (c = *s; c != L_('\0'); c = *++s)
    {
      if (s == end)
	break;
      if (c >= L_('0') && c <= L_('9'))
	c -= L_('0');
      else if (ISALPHA (c))
	c = TOUPPER (c) - L_('A') + 10;
      else
	break;
      if (c >= base)
	break;
      /* Check for overflow.  */
      if (i > cutoff || (i == cutoff && c > cutlim))
	overflow = 1;
      else
	{
	  i *= (unsigned LONG int) base;
	  i += c;
	}
    }

  /* Check if anything actually happened.  */
  if (s == save)
    goto noconv;

  /* Store in ENDPTR the address of one character
     past the last character we converted.  */
  if (endptr != NULL)
    *endptr = (STRING_TYPE *) s;

#if !UNSIGNED
  /* Check for a value that is within the range of
     `unsigned LONG int', but outside the range of `LONG int'.  */
  if (overflow == 0
      && i > (negative
	      ? -((unsigned LONG int) (LONG_MIN + 1)) + 1
	      : (unsigned LONG int) LONG_MAX))
    overflow = 1;
#endif

  if (overflow)
    {
      errno = ERANGE;
#if UNSIGNED
      return ULONG_MAX;
#else
      return negative ? LONG_MIN : LONG_MAX;
#endif
    }

  /* Return the result of the appropriate sign.  */
  return (negative ? -i : i);

noconv:
  /* We must handle a special case here: the base is 0 or 16 and the
     first two characters are '0' and 'x', but the rest are no
     hexadecimal digits.  This is no error case.  We return 0 and
     ENDPTR points to the `x`.  */
  if (endptr != NULL)
    if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
	&& save[-2] == L_('0'))
      *endptr = (STRING_TYPE *) &save[-1];
    else
      /*  There was no number to convert.  */
      *endptr = (STRING_TYPE *) nptr;

  return 0L;
}

/* External user entry point.  */
INT
strtol (nptr, endptr, base)
     const STRING_TYPE *nptr;
     STRING_TYPE **endptr;
     int base;
{
  return INTERNAL (strtol) (nptr, endptr, base, 0);
}
#ifdef weak_symbol
/* We need to weaken this symbol because some the the defined
   functions do not come from ANSI.  The indirection is necessary
   because `strtol' might be a macro.  */
#define weak_this(x) weak_symbol (x)
weak_this (strtol)
#endif