Line data Source code
1 :
2 : #include "Python.h"
3 :
4 : #if defined(__sgi) && defined(WITH_THREAD) && !defined(_SGI_MP_SOURCE)
5 : #define _SGI_MP_SOURCE
6 : #endif
7 :
8 : /* strtol and strtoul, renamed to avoid conflicts */
9 :
10 :
11 : #include <ctype.h>
12 : #ifdef HAVE_ERRNO_H
13 : #include <errno.h>
14 : #endif
15 :
16 : /* Static overflow check values for bases 2 through 36.
17 : * smallmax[base] is the largest unsigned long i such that
18 : * i * base doesn't overflow unsigned long.
19 : */
20 : static unsigned long smallmax[] = {
21 : 0, /* bases 0 and 1 are invalid */
22 : 0,
23 : ULONG_MAX / 2,
24 : ULONG_MAX / 3,
25 : ULONG_MAX / 4,
26 : ULONG_MAX / 5,
27 : ULONG_MAX / 6,
28 : ULONG_MAX / 7,
29 : ULONG_MAX / 8,
30 : ULONG_MAX / 9,
31 : ULONG_MAX / 10,
32 : ULONG_MAX / 11,
33 : ULONG_MAX / 12,
34 : ULONG_MAX / 13,
35 : ULONG_MAX / 14,
36 : ULONG_MAX / 15,
37 : ULONG_MAX / 16,
38 : ULONG_MAX / 17,
39 : ULONG_MAX / 18,
40 : ULONG_MAX / 19,
41 : ULONG_MAX / 20,
42 : ULONG_MAX / 21,
43 : ULONG_MAX / 22,
44 : ULONG_MAX / 23,
45 : ULONG_MAX / 24,
46 : ULONG_MAX / 25,
47 : ULONG_MAX / 26,
48 : ULONG_MAX / 27,
49 : ULONG_MAX / 28,
50 : ULONG_MAX / 29,
51 : ULONG_MAX / 30,
52 : ULONG_MAX / 31,
53 : ULONG_MAX / 32,
54 : ULONG_MAX / 33,
55 : ULONG_MAX / 34,
56 : ULONG_MAX / 35,
57 : ULONG_MAX / 36,
58 : };
59 :
60 : /* maximum digits that can't ever overflow for bases 2 through 36,
61 : * calculated by [int(math.floor(math.log(2**32, i))) for i in range(2, 37)].
62 : * Note that this is pessimistic if sizeof(long) > 4.
63 : */
64 : #if SIZEOF_LONG == 4
65 : static int digitlimit[] = {
66 : 0, 0, 32, 20, 16, 13, 12, 11, 10, 10, /* 0 - 9 */
67 : 9, 9, 8, 8, 8, 8, 8, 7, 7, 7, /* 10 - 19 */
68 : 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, /* 20 - 29 */
69 : 6, 6, 6, 6, 6, 6, 6}; /* 30 - 36 */
70 : #elif SIZEOF_LONG == 8
71 : /* [int(math.floor(math.log(2**64, i))) for i in range(2, 37)] */
72 : static int digitlimit[] = {
73 : 0, 0, 64, 40, 32, 27, 24, 22, 21, 20, /* 0 - 9 */
74 : 19, 18, 17, 17, 16, 16, 16, 15, 15, 15, /* 10 - 19 */
75 : 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, /* 20 - 29 */
76 : 13, 12, 12, 12, 12, 12, 12}; /* 30 - 36 */
77 : #else
78 : #error "Need table for SIZEOF_LONG"
79 : #endif
80 :
81 : /*
82 : ** strtoul
83 : ** This is a general purpose routine for converting
84 : ** an ascii string to an integer in an arbitrary base.
85 : ** Leading white space is ignored. If 'base' is zero
86 : ** it looks for a leading 0, 0b, 0B, 0o, 0O, 0x or 0X
87 : ** to tell which base. If these are absent it defaults
88 : ** to 10. Base must be 0 or between 2 and 36 (inclusive).
89 : ** If 'ptr' is non-NULL it will contain a pointer to
90 : ** the end of the scan.
91 : ** Errors due to bad pointers will probably result in
92 : ** exceptions - we don't check for them.
93 : */
94 : unsigned long
95 3834 : PyOS_strtoul(register char *str, char **ptr, int base)
96 : {
97 3834 : register unsigned long result = 0; /* return value of the function */
98 : register int c; /* current input character */
99 : register int ovlimit; /* required digits to overflow */
100 :
101 : /* skip leading white space */
102 7668 : while (*str && isspace(Py_CHARMASK(*str)))
103 0 : ++str;
104 :
105 : /* check for leading 0 or 0x for auto-base or base 16 */
106 3834 : switch (base) {
107 : case 0: /* look for leading 0, 0b, 0o or 0x */
108 759 : if (*str == '0') {
109 268 : ++str;
110 268 : if (*str == 'x' || *str == 'X') {
111 : /* there must be at least one digit after 0x */
112 3 : if (_PyLong_DigitValue[Py_CHARMASK(str[1])] >= 16) {
113 0 : if (ptr)
114 0 : *ptr = str;
115 0 : return 0;
116 : }
117 3 : ++str;
118 3 : base = 16;
119 265 : } else if (*str == 'o' || *str == 'O') {
120 : /* there must be at least one digit after 0o */
121 0 : if (_PyLong_DigitValue[Py_CHARMASK(str[1])] >= 8) {
122 0 : if (ptr)
123 0 : *ptr = str;
124 0 : return 0;
125 : }
126 0 : ++str;
127 0 : base = 8;
128 265 : } else if (*str == 'b' || *str == 'B') {
129 : /* there must be at least one digit after 0b */
130 0 : if (_PyLong_DigitValue[Py_CHARMASK(str[1])] >= 2) {
131 0 : if (ptr)
132 0 : *ptr = str;
133 0 : return 0;
134 : }
135 0 : ++str;
136 0 : base = 2;
137 : } else {
138 265 : base = 8;
139 : }
140 : }
141 : else
142 491 : base = 10;
143 759 : break;
144 :
145 : case 2: /* skip leading 0b or 0B */
146 1584 : if (*str == '0') {
147 1485 : ++str;
148 1485 : if (*str == 'b' || *str == 'B') {
149 : /* there must be at least one digit after 0b */
150 0 : if (_PyLong_DigitValue[Py_CHARMASK(str[1])] >= 2) {
151 0 : if (ptr)
152 0 : *ptr = str;
153 0 : return 0;
154 : }
155 0 : ++str;
156 : }
157 : }
158 1584 : break;
159 :
160 : case 8: /* skip leading 0o or 0O */
161 18 : if (*str == '0') {
162 18 : ++str;
163 18 : if (*str == 'o' || *str == 'O') {
164 : /* there must be at least one digit after 0o */
165 0 : if (_PyLong_DigitValue[Py_CHARMASK(str[1])] >= 8) {
166 0 : if (ptr)
167 0 : *ptr = str;
168 0 : return 0;
169 : }
170 0 : ++str;
171 : }
172 : }
173 18 : break;
174 :
175 : case 16: /* skip leading 0x or 0X */
176 1470 : if (*str == '0') {
177 72 : ++str;
178 72 : if (*str == 'x' || *str == 'X') {
179 : /* there must be at least one digit after 0x */
180 0 : if (_PyLong_DigitValue[Py_CHARMASK(str[1])] >= 16) {
181 0 : if (ptr)
182 0 : *ptr = str;
183 0 : return 0;
184 : }
185 0 : ++str;
186 : }
187 : }
188 1470 : break;
189 : }
190 :
191 : /* catch silly bases */
192 3834 : if (base < 2 || base > 36) {
193 0 : if (ptr)
194 0 : *ptr = str;
195 0 : return 0;
196 : }
197 :
198 : /* skip leading zeroes */
199 45951 : while (*str == '0')
200 38283 : ++str;
201 :
202 : /* base is guaranteed to be in [2, 36] at this point */
203 3834 : ovlimit = digitlimit[base];
204 :
205 : /* do the conversion until non-digit character encountered */
206 22009 : while ((c = _PyLong_DigitValue[Py_CHARMASK(*str)]) < base) {
207 14341 : if (ovlimit > 0) /* no overflow check required */
208 14341 : result = result * base + c;
209 : else { /* requires overflow check */
210 : register unsigned long temp_result;
211 :
212 0 : if (ovlimit < 0) /* guaranteed overflow */
213 0 : goto overflowed;
214 :
215 : /* there could be an overflow */
216 : /* check overflow just from shifting */
217 0 : if (result > smallmax[base])
218 0 : goto overflowed;
219 :
220 0 : result *= base;
221 :
222 : /* check overflow from the digit's value */
223 0 : temp_result = result + c;
224 0 : if (temp_result < result)
225 0 : goto overflowed;
226 :
227 0 : result = temp_result;
228 : }
229 :
230 14341 : ++str;
231 14341 : --ovlimit;
232 : }
233 :
234 : /* set pointer to point to the last character scanned */
235 3834 : if (ptr)
236 3834 : *ptr = str;
237 :
238 3834 : return result;
239 :
240 : overflowed:
241 0 : if (ptr) {
242 : /* spool through remaining digit characters */
243 0 : while (_PyLong_DigitValue[Py_CHARMASK(*str)] < base)
244 0 : ++str;
245 0 : *ptr = str;
246 : }
247 0 : errno = ERANGE;
248 0 : return (unsigned long)-1;
249 : }
250 :
251 : /* Checking for overflow in PyOS_strtol is a PITA; see comments
252 : * about PY_ABS_LONG_MIN in longobject.c.
253 : */
254 : #define PY_ABS_LONG_MIN (0-(unsigned long)LONG_MIN)
255 :
256 : long
257 3834 : PyOS_strtol(char *str, char **ptr, int base)
258 : {
259 : long result;
260 : unsigned long uresult;
261 : char sign;
262 :
263 7668 : while (*str && isspace(Py_CHARMASK(*str)))
264 0 : str++;
265 :
266 3834 : sign = *str;
267 3834 : if (sign == '+' || sign == '-')
268 87 : str++;
269 :
270 3834 : uresult = PyOS_strtoul(str, ptr, base);
271 :
272 3834 : if (uresult <= (unsigned long)LONG_MAX) {
273 3834 : result = (long)uresult;
274 3834 : if (sign == '-')
275 87 : result = -result;
276 : }
277 0 : else if (sign == '-' && uresult == PY_ABS_LONG_MIN) {
278 0 : result = LONG_MIN;
279 : }
280 : else {
281 0 : errno = ERANGE;
282 0 : result = LONG_MAX;
283 : }
284 3834 : return result;
285 : }
|
