1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 5 |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | http://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Authors: Vadim Savchuk <vsavchuk@productengine.com> |
14 | Dmitry Lakhtyuk <dlakhtyuk@productengine.com> |
15 +----------------------------------------------------------------------+
16 */
17
18 #include "collator_is_numeric.h"
19
20 #if ZEND_MODULE_API_NO < 20071006
21 /* not 5.3 */
22 #ifndef ALLOCA_FLAG
23 #define ALLOCA_FLAG(use_heap)
24 #endif
25 #define _do_alloca(x, y) do_alloca((x))
26 #define _free_alloca(x, y) free_alloca((x))
27 #else
28 #define _do_alloca do_alloca
29 #define _free_alloca free_alloca
30 #endif
31 /* {{{ collator_u_strtod
32 * Taken from PHP6:zend_u_strtod()
33 */
collator_u_strtod(const UChar * nptr,UChar ** endptr)34 static double collator_u_strtod(const UChar *nptr, UChar **endptr) /* {{{ */
35 {
36 const UChar *u = nptr, *nstart;
37 UChar c = *u;
38 int any = 0;
39 ALLOCA_FLAG(use_heap);
40
41 while (u_isspace(c)) {
42 c = *++u;
43 }
44 nstart = u;
45
46 if (c == 0x2D /*'-'*/ || c == 0x2B /*'+'*/) {
47 c = *++u;
48 }
49
50 while (c >= 0x30 /*'0'*/ && c <= 0x39 /*'9'*/) {
51 any = 1;
52 c = *++u;
53 }
54
55 if (c == 0x2E /*'.'*/) {
56 c = *++u;
57 while (c >= 0x30 /*'0'*/ && c <= 0x39 /*'9'*/) {
58 any = 1;
59 c = *++u;
60 }
61 }
62
63 if ((c == 0x65 /*'e'*/ || c == 0x45 /*'E'*/) && any) {
64 const UChar *e = u;
65 int any_exp = 0;
66
67 c = *++u;
68 if (c == 0x2D /*'-'*/ || c == 0x2B /*'+'*/) {
69 c = *++u;
70 }
71
72 while (c >= 0x30 /*'0'*/ && c <= 0x39 /*'9'*/) {
73 any_exp = 1;
74 c = *++u;
75 }
76
77 if (!any_exp) {
78 u = e;
79 }
80 }
81
82 if (any) {
83 char buf[64], *numbuf, *bufpos;
84 int length = u - nstart;
85 double value;
86
87 if (length < sizeof(buf)) {
88 numbuf = buf;
89 } else {
90 numbuf = (char *) _do_alloca(length + 1, use_heap);
91 }
92
93 bufpos = numbuf;
94
95 while (nstart < u) {
96 *bufpos++ = (char) *nstart++;
97 }
98
99 *bufpos = '\0';
100 value = zend_strtod(numbuf, NULL);
101
102 if (numbuf != buf) {
103 _free_alloca(numbuf, use_heap);
104 }
105
106 if (endptr != NULL) {
107 *endptr = (UChar *)u;
108 }
109
110 return value;
111 }
112
113 if (endptr != NULL) {
114 *endptr = (UChar *)nptr;
115 }
116
117 return 0;
118 }
119 /* }}} */
120
121 /* {{{ collator_u_strtol
122 * Taken from PHP6:zend_u_strtol()
123 *
124 * Convert a Unicode string to a long integer.
125 *
126 * Ignores `locale' stuff.
127 */
collator_u_strtol(nptr,endptr,base)128 static long collator_u_strtol(nptr, endptr, base)
129 const UChar *nptr;
130 UChar **endptr;
131 register int base;
132 {
133 register const UChar *s = nptr;
134 register unsigned long acc;
135 register UChar c;
136 register unsigned long cutoff;
137 register int neg = 0, any, cutlim;
138
139 if (s == NULL) {
140 errno = ERANGE;
141 if (endptr != NULL) {
142 *endptr = NULL;
143 }
144 return 0;
145 }
146
147 /*
148 * Skip white space and pick up leading +/- sign if any.
149 * If base is 0, allow 0x for hex and 0 for octal, else
150 * assume decimal; if base is already 16, allow 0x.
151 */
152 do {
153 c = *s++;
154 } while (u_isspace(c));
155 if (c == 0x2D /*'-'*/) {
156 neg = 1;
157 c = *s++;
158 } else if (c == 0x2B /*'+'*/)
159 c = *s++;
160 if ((base == 0 || base == 16) &&
161 (c == 0x30 /*'0'*/)
162 && (*s == 0x78 /*'x'*/ || *s == 0x58 /*'X'*/)) {
163 c = s[1];
164 s += 2;
165 base = 16;
166 }
167 if (base == 0)
168 base = (c == 0x30 /*'0'*/) ? 8 : 10;
169
170 /*
171 * Compute the cutoff value between legal numbers and illegal
172 * numbers. That is the largest legal value, divided by the
173 * base. An input number that is greater than this value, if
174 * followed by a legal input character, is too big. One that
175 * is equal to this value may be valid or not; the limit
176 * between valid and invalid numbers is then based on the last
177 * digit. For instance, if the range for longs is
178 * [-2147483648..2147483647] and the input base is 10,
179 * cutoff will be set to 214748364 and cutlim to either
180 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
181 * a value > 214748364, or equal but the next digit is > 7 (or 8),
182 * the number is too big, and we will return a range error.
183 *
184 * Set any if any `digits' consumed; make it negative to indicate
185 * overflow.
186 */
187 cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
188 cutlim = cutoff % (unsigned long)base;
189 cutoff /= (unsigned long)base;
190 for (acc = 0, any = 0;; c = *s++) {
191 if (c >= 0x30 /*'0'*/ && c <= 0x39 /*'9'*/)
192 c -= 0x30 /*'0'*/;
193 else if (c >= 0x41 /*'A'*/ && c <= 0x5A /*'Z'*/)
194 c -= 0x41 /*'A'*/ - 10;
195 else if (c >= 0x61 /*'a'*/ && c <= 0x7A /*'z'*/)
196 c -= 0x61 /*'a'*/ - 10;
197 else
198 break;
199 if (c >= base)
200 break;
201
202 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
203 any = -1;
204 else {
205 any = 1;
206 acc *= base;
207 acc += c;
208 }
209 }
210 if (any < 0) {
211 acc = neg ? LONG_MIN : LONG_MAX;
212 errno = ERANGE;
213 } else if (neg)
214 acc = -acc;
215 if (endptr != NULL)
216 *endptr = (UChar *)(any ? s - 1 : nptr);
217 return (acc);
218 }
219 /* }}} */
220
221
222 /* {{{ collator_is_numeric]
223 * Taken from PHP6:is_numeric_unicode()
224 */
collator_is_numeric(UChar * str,int length,long * lval,double * dval,int allow_errors)225 zend_uchar collator_is_numeric( UChar *str, int length, long *lval, double *dval, int allow_errors )
226 {
227 long local_lval;
228 double local_dval;
229 UChar *end_ptr_long, *end_ptr_double;
230 int conv_base=10;
231
232 if (!length) {
233 return 0;
234 }
235
236 /* handle hex numbers */
237 if (length>=2 && str[0]=='0' && (str[1]=='x' || str[1]=='X')) {
238 conv_base=16;
239 }
240
241 errno=0;
242 local_lval = collator_u_strtol(str, &end_ptr_long, conv_base);
243 if (errno != ERANGE) {
244 if (end_ptr_long == str+length) { /* integer string */
245 if (lval) {
246 *lval = local_lval;
247 }
248 return IS_LONG;
249 } else if (end_ptr_long == str && *end_ptr_long != '\0' && *str != '.' && *str != '-') { /* ignore partial string matches */
250 return 0;
251 }
252 } else {
253 end_ptr_long = NULL;
254 }
255
256 if (conv_base == 16) { /* hex string, under UNIX strtod() messes it up */
257 /* UTODO: keep compatibility with is_numeric_string() here? */
258 return 0;
259 }
260
261 local_dval = collator_u_strtod(str, &end_ptr_double);
262 if (local_dval == 0 && end_ptr_double == str) {
263 end_ptr_double = NULL;
264 } else {
265 if (end_ptr_double == str+length) { /* floating point string */
266 if (!zend_finite(local_dval)) {
267 /* "inf","nan" and maybe other weird ones */
268 return 0;
269 }
270
271 if (dval) {
272 *dval = local_dval;
273 }
274 return IS_DOUBLE;
275 }
276 }
277
278 if (!allow_errors) {
279 return 0;
280 }
281 if (allow_errors == -1) {
282 zend_error(E_NOTICE, "A non well formed numeric value encountered");
283 }
284
285 if (allow_errors) {
286 if (end_ptr_double > end_ptr_long && dval) {
287 *dval = local_dval;
288 return IS_DOUBLE;
289 } else if (end_ptr_long && lval) {
290 *lval = local_lval;
291 return IS_LONG;
292 }
293 }
294 return 0;
295 }
296 /* }}} */
297
298 /*
299 * Local variables:
300 * tab-width: 4
301 * c-basic-offset: 4
302 * End:
303 * vim600: noet sw=4 ts=4 fdm=marker
304 * vim<600: noet sw=4 ts=4
305 */
306
