strtol.c - enscript - GNU Enscript
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---
strtol.c (8630B)
---
1 /* strtol - Convert string representation of a number into an integer value.
2 Copyright (C) 1991, 92, 94, 95, 96, 97 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA. */
19
20 #if HAVE_CONFIG_H
21 # include <config.h>
22 #endif
23
24 #ifdef _LIBC
25 # define USE_NUMBER_GROUPING
26 # define STDC_HEADERS
27 # define HAVE_LIMITS_H
28 #endif
29
30 #include <ctype.h>
31 #include <errno.h>
32 #ifndef errno
33 extern int errno;
34 #endif
35 #ifndef __set_errno
36 # define __set_errno(Val) errno = (Val)
37 #endif
38
39 #ifdef HAVE_LIMITS_H
40 # include <limits.h>
41 #endif
42
43 #ifdef STDC_HEADERS
44 # include <stddef.h>
45 # include <stdlib.h>
46 # include <string.h>
47 #else
48 # ifndef NULL
49 # define NULL 0
50 # endif
51 #endif
52
53 #ifdef USE_NUMBER_GROUPING
54 # include "../locale/localeinfo.h"
55 #endif
56
57 /* Nonzero if we are defining `strtoul' or `strtouq', operating on
58 unsigned integers. */
59 #ifndef UNSIGNED
60 # define UNSIGNED 0
61 # define INT LONG int
62 #else
63 # define INT unsigned LONG int
64 #endif
65
66 /* Determine the name. */
67 #if UNSIGNED
68 # ifdef USE_WIDE_CHAR
69 # ifdef QUAD
70 # define strtol wcstouq
71 # else
72 # define strtol wcstoul
73 # endif
74 # else
75 # ifdef QUAD
76 # define strtol strtouq
77 # else
78 # define strtol strtoul
79 # endif
80 # endif
81 #else
82 # ifdef USE_WIDE_CHAR
83 # ifdef QUAD
84 # define strtol wcstoq
85 # else
86 # define strtol wcstol
87 # endif
88 # else
89 # ifdef QUAD
90 # define strtol strtoq
91 # endif
92 # endif
93 #endif
94
95 /* If QUAD is defined, we are defining `strtoq' or `strtouq',
96 operating on `long long int's. */
97 #ifdef QUAD
98 # define LONG long long
99 # undef LONG_MIN
100 # define LONG_MIN LONG_LONG_MIN
101 # undef LONG_MAX
102 # define LONG_MAX LONG_LONG_MAX
103 # undef ULONG_MAX
104 # define ULONG_MAX ULONG_LONG_MAX
105 # if __GNUC__ == 2 && __GNUC_MINOR__ < 7
106 /* Work around gcc bug with using this constant. */
107 static const unsigned long long int maxquad = ULONG_LONG_MAX;
108 # undef ULONG_MAX
109 # define ULONG_MAX maxquad
110 # endif
111 #else
112 # define LONG long
113
114 #ifndef ULONG_MAX
115 # define ULONG_MAX ((unsigned long) ~(unsigned long) 0)
116 #endif
117 #ifndef LONG_MAX
118 # define LONG_MAX ((long int) (ULONG_MAX >> 1))
119 #endif
120 #endif
121
122 #ifdef USE_WIDE_CHAR
123 # include <wchar.h>
124 # include <wctype.h>
125 # define L_(Ch) L##Ch
126 # define UCHAR_TYPE wint_t
127 # define STRING_TYPE wchar_t
128 # define ISSPACE(Ch) iswspace (Ch)
129 # define ISALPHA(Ch) iswalpha (Ch)
130 # define TOUPPER(Ch) towupper (Ch)
131 #else
132 # define L_(Ch) Ch
133 # define UCHAR_TYPE unsigned char
134 # define STRING_TYPE char
135 # define ISSPACE(Ch) isspace (Ch)
136 # define ISALPHA(Ch) isalpha (Ch)
137 # define TOUPPER(Ch) toupper (Ch)
138 #endif
139
140 #ifdef __STDC__
141 # define INTERNAL(X) INTERNAL1(X)
142 # define INTERNAL1(X) __##X##_internal
143 # define WEAKNAME(X) WEAKNAME1(X)
144 #else
145 # define INTERNAL(X) __/**/X/**/_internal
146 #endif
147
148 #ifdef USE_NUMBER_GROUPING
149 /* This file defines a function to check for correct grouping. */
150 # include "grouping.h"
151 #endif
152
153
154 /* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
155 If BASE is 0 the base is determined by the presence of a leading
156 zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
157 If BASE is < 2 or > 36, it is reset to 10.
158 If ENDPTR is not NULL, a pointer to the character after the last
159 one converted is stored in *ENDPTR. */
160
161 INT
162 INTERNAL (strtol) (nptr, endptr, base, group)
163 const STRING_TYPE *nptr;
164 STRING_TYPE **endptr;
165 int base;
166 int group;
167 {
168 int negative;
169 register unsigned LONG int cutoff;
170 register unsigned int cutlim;
171 register unsigned LONG int i;
172 register const STRING_TYPE *s;
173 register UCHAR_TYPE c;
174 const STRING_TYPE *save, *end;
175 int overflow;
176
177 #ifdef USE_NUMBER_GROUPING
178 /* The thousands character of the current locale. */
179 wchar_t thousands;
180 /* The numeric grouping specification of the current locale,
181 in the format described in <locale.h>. */
182 const char *grouping;
183
184 if (group)
185 {
186 grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
187 if (*grouping <= 0 || *grouping == CHAR_MAX)
188 grouping = NULL;
189 else
190 {
191 /* Figure out the thousands separator character. */
192 if (mbtowc (&thousands, _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP),
193 strlen (_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP))) <= 0)
194 thousands = (wchar_t) *_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
195 if (thousands == L'\0')
196 grouping = NULL;
197 }
198 }
199 else
200 grouping = NULL;
201 #endif
202
203 if (base < 0 || base == 1 || base > 36)
204 {
205 __set_errno (EINVAL);
206 return 0;
207 }
208
209 save = s = nptr;
210
211 /* Skip white space. */
212 while (ISSPACE (*s))
213 ++s;
214 if (*s == L_('\0'))
215 goto noconv;
216
217 /* Check for a sign. */
218 if (*s == L_('-'))
219 {
220 negative = 1;
221 ++s;
222 }
223 else if (*s == L_('+'))
224 {
225 negative = 0;
226 ++s;
227 }
228 else
229 negative = 0;
230
231 if (base == 16 && s[0] == L_('0') && TOUPPER (s[1]) == L_('X'))
232 s += 2;
233
234 /* If BASE is zero, figure it out ourselves. */
235 if (base == 0)
236 if (*s == L_('0'))
237 {
238 if (TOUPPER (s[1]) == L_('X'))
239 {
240 s += 2;
241 base = 16;
242 }
243 else
244 base = 8;
245 }
246 else
247 base = 10;
248
249 /* Save the pointer so we can check later if anything happened. */
250 save = s;
251
252 #ifdef USE_NUMBER_GROUPING
253 if (group)
254 {
255 /* Find the end of the digit string and check its grouping. */
256 end = s;
257 for (c = *end; c != L_('\0'); c = *++end)
258 if ((wchar_t) c != thousands
259 && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
260 && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
261 break;
262 if (*s == thousands)
263 end = s;
264 else
265 end = correctly_grouped_prefix (s, end, thousands, grouping);
266 }
267 else
268 #endif
269 end = NULL;
270
271 cutoff = ULONG_MAX / (unsigned LONG int) base;
272 cutlim = ULONG_MAX % (unsigned LONG int) base;
273
274 overflow = 0;
275 i = 0;
276 for (c = *s; c != L_('\0'); c = *++s)
277 {
278 if (s == end)
279 break;
280 if (c >= L_('0') && c <= L_('9'))
281 c -= L_('0');
282 else if (ISALPHA (c))
283 c = TOUPPER (c) - L_('A') + 10;
284 else
285 break;
286 if ((int) c >= base)
287 break;
288 /* Check for overflow. */
289 if (i > cutoff || (i == cutoff && c > cutlim))
290 overflow = 1;
291 else
292 {
293 i *= (unsigned LONG int) base;
294 i += c;
295 }
296 }
297
298 /* Check if anything actually happened. */
299 if (s == save)
300 goto noconv;
301
302 /* Store in ENDPTR the address of one character
303 past the last character we converted. */
304 if (endptr != NULL)
305 *endptr = (STRING_TYPE *) s;
306
307 #if !UNSIGNED
308 /* Check for a value that is within the range of
309 `unsigned LONG int', but outside the range of `LONG int'. */
310 if (overflow == 0
311 && i > (negative
312 ? -((unsigned LONG int) (LONG_MIN + 1)) + 1
313 : (unsigned LONG int) LONG_MAX))
314 overflow = 1;
315 #endif
316
317 if (overflow)
318 {
319 __set_errno (ERANGE);
320 #if UNSIGNED
321 return ULONG_MAX;
322 #else
323 return negative ? LONG_MIN : LONG_MAX;
324 #endif
325 }
326
327 /* Return the result of the appropriate sign. */
328 return (negative ? -i : i);
329
330 noconv:
331 /* We must handle a special case here: the base is 0 or 16 and the
332 first two characters are '0' and 'x', but the rest are no
333 hexadecimal digits. This is no error case. We return 0 and
334 ENDPTR points to the `x`. */
335 if (endptr != NULL)
336 if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
337 && save[-2] == L_('0'))
338 *endptr = (STRING_TYPE *) &save[-1];
339 else
340 /* There was no number to convert. */
341 *endptr = (STRING_TYPE *) nptr;
342
343 return 0L;
344 }
345
346 /* External user entry point. */
347
348 #if _LIBC - 0 == 0
349 # undef PARAMS
350 # if defined (__STDC__) && __STDC__
351 # define PARAMS(Args) Args
352 # else
353 # define PARAMS(Args) ()
354 # endif
355
356 /* Prototype. */
357 INT strtol PARAMS ((const STRING_TYPE *nptr, STRING_TYPE **endptr, int base));
358 #endif
359
360
361 INT
362 #ifdef weak_function
363 weak_function
364 #endif
365 strtol (nptr, endptr, base)
366 const STRING_TYPE *nptr;
367 STRING_TYPE **endptr;
368 int base;
369 {
370 return INTERNAL (strtol) (nptr, endptr, base, 0);
371 }