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1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: utnonansi - Non-ansi C library functions | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2015, Intel Corp. | |
9 | * All rights reserved. | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
44 | #include <acpi/acpi.h> | |
45 | #include "accommon.h" | |
46 | ||
47 | #define _COMPONENT ACPI_UTILITIES | |
48 | ACPI_MODULE_NAME("utnonansi") | |
49 | ||
50 | /* | |
51 | * Non-ANSI C library functions - strlwr, strupr, stricmp, and a 64-bit | |
52 | * version of strtoul. | |
53 | */ | |
54 | /******************************************************************************* | |
55 | * | |
56 | * FUNCTION: acpi_ut_strlwr (strlwr) | |
57 | * | |
58 | * PARAMETERS: src_string - The source string to convert | |
59 | * | |
60 | * RETURN: None | |
61 | * | |
62 | * DESCRIPTION: Convert a string to lowercase | |
63 | * | |
64 | ******************************************************************************/ | |
65 | void acpi_ut_strlwr(char *src_string) | |
66 | { | |
67 | char *string; | |
68 | ||
69 | ACPI_FUNCTION_ENTRY(); | |
70 | ||
71 | if (!src_string) { | |
72 | return; | |
73 | } | |
74 | ||
75 | /* Walk entire string, lowercasing the letters */ | |
76 | ||
77 | for (string = src_string; *string; string++) { | |
78 | *string = (char)tolower((int)*string); | |
79 | } | |
80 | } | |
81 | ||
82 | /******************************************************************************* | |
83 | * | |
84 | * FUNCTION: acpi_ut_strupr (strupr) | |
85 | * | |
86 | * PARAMETERS: src_string - The source string to convert | |
87 | * | |
88 | * RETURN: None | |
89 | * | |
90 | * DESCRIPTION: Convert a string to uppercase | |
91 | * | |
92 | ******************************************************************************/ | |
93 | ||
94 | void acpi_ut_strupr(char *src_string) | |
95 | { | |
96 | char *string; | |
97 | ||
98 | ACPI_FUNCTION_ENTRY(); | |
99 | ||
100 | if (!src_string) { | |
101 | return; | |
102 | } | |
103 | ||
104 | /* Walk entire string, uppercasing the letters */ | |
105 | ||
106 | for (string = src_string; *string; string++) { | |
107 | *string = (char)toupper((int)*string); | |
108 | } | |
109 | } | |
110 | ||
111 | /****************************************************************************** | |
112 | * | |
113 | * FUNCTION: acpi_ut_stricmp (stricmp) | |
114 | * | |
115 | * PARAMETERS: string1 - first string to compare | |
116 | * string2 - second string to compare | |
117 | * | |
118 | * RETURN: int that signifies string relationship. Zero means strings | |
119 | * are equal. | |
120 | * | |
121 | * DESCRIPTION: Case-insensitive string compare. Implementation of the | |
122 | * non-ANSI stricmp function. | |
123 | * | |
124 | ******************************************************************************/ | |
125 | ||
126 | int acpi_ut_stricmp(char *string1, char *string2) | |
127 | { | |
128 | int c1; | |
129 | int c2; | |
130 | ||
131 | do { | |
132 | c1 = tolower((int)*string1); | |
133 | c2 = tolower((int)*string2); | |
134 | ||
135 | string1++; | |
136 | string2++; | |
137 | } | |
138 | while ((c1 == c2) && (c1)); | |
139 | ||
140 | return (c1 - c2); | |
141 | } | |
142 | ||
143 | /******************************************************************************* | |
144 | * | |
145 | * FUNCTION: acpi_ut_strtoul64 | |
146 | * | |
147 | * PARAMETERS: string - Null terminated string | |
148 | * base - Radix of the string: 16 or ACPI_ANY_BASE; | |
149 | * ACPI_ANY_BASE means 'in behalf of to_integer' | |
150 | * ret_integer - Where the converted integer is returned | |
151 | * | |
152 | * RETURN: Status and Converted value | |
153 | * | |
154 | * DESCRIPTION: Convert a string into an unsigned value. Performs either a | |
155 | * 32-bit or 64-bit conversion, depending on the current mode | |
156 | * of the interpreter. | |
157 | * | |
158 | * NOTE: Does not support Octal strings, not needed. | |
159 | * | |
160 | ******************************************************************************/ | |
161 | ||
162 | acpi_status acpi_ut_strtoul64(char *string, u32 base, u64 *ret_integer) | |
163 | { | |
164 | u32 this_digit = 0; | |
165 | u64 return_value = 0; | |
166 | u64 quotient; | |
167 | u64 dividend; | |
168 | u32 to_integer_op = (base == ACPI_ANY_BASE); | |
169 | u32 mode32 = (acpi_gbl_integer_byte_width == 4); | |
170 | u8 valid_digits = 0; | |
171 | u8 sign_of0x = 0; | |
172 | u8 term = 0; | |
173 | ||
174 | ACPI_FUNCTION_TRACE_STR(ut_stroul64, string); | |
175 | ||
176 | switch (base) { | |
177 | case ACPI_ANY_BASE: | |
178 | case 16: | |
179 | ||
180 | break; | |
181 | ||
182 | default: | |
183 | ||
184 | /* Invalid Base */ | |
185 | ||
186 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
187 | } | |
188 | ||
189 | if (!string) { | |
190 | goto error_exit; | |
191 | } | |
192 | ||
193 | /* Skip over any white space in the buffer */ | |
194 | ||
195 | while ((*string) && (isspace((int)*string) || *string == '\t')) { | |
196 | string++; | |
197 | } | |
198 | ||
199 | if (to_integer_op) { | |
200 | /* | |
201 | * Base equal to ACPI_ANY_BASE means 'ToInteger operation case'. | |
202 | * We need to determine if it is decimal or hexadecimal. | |
203 | */ | |
204 | if ((*string == '0') && (tolower((int)*(string + 1)) == 'x')) { | |
205 | sign_of0x = 1; | |
206 | base = 16; | |
207 | ||
208 | /* Skip over the leading '0x' */ | |
209 | string += 2; | |
210 | } else { | |
211 | base = 10; | |
212 | } | |
213 | } | |
214 | ||
215 | /* Any string left? Check that '0x' is not followed by white space. */ | |
216 | ||
217 | if (!(*string) || isspace((int)*string) || *string == '\t') { | |
218 | if (to_integer_op) { | |
219 | goto error_exit; | |
220 | } else { | |
221 | goto all_done; | |
222 | } | |
223 | } | |
224 | ||
225 | /* | |
226 | * Perform a 32-bit or 64-bit conversion, depending upon the current | |
227 | * execution mode of the interpreter | |
228 | */ | |
229 | dividend = (mode32) ? ACPI_UINT32_MAX : ACPI_UINT64_MAX; | |
230 | ||
231 | /* Main loop: convert the string to a 32- or 64-bit integer */ | |
232 | ||
233 | while (*string) { | |
234 | if (isdigit((int)*string)) { | |
235 | ||
236 | /* Convert ASCII 0-9 to Decimal value */ | |
237 | ||
238 | this_digit = ((u8)*string) - '0'; | |
239 | } else if (base == 10) { | |
240 | ||
241 | /* Digit is out of range; possible in to_integer case only */ | |
242 | ||
243 | term = 1; | |
244 | } else { | |
245 | this_digit = (u8)toupper((int)*string); | |
246 | if (isxdigit((int)this_digit)) { | |
247 | ||
248 | /* Convert ASCII Hex char to value */ | |
249 | ||
250 | this_digit = this_digit - 'A' + 10; | |
251 | } else { | |
252 | term = 1; | |
253 | } | |
254 | } | |
255 | ||
256 | if (term) { | |
257 | if (to_integer_op) { | |
258 | goto error_exit; | |
259 | } else { | |
260 | break; | |
261 | } | |
262 | } else if ((valid_digits == 0) && (this_digit == 0) | |
263 | && !sign_of0x) { | |
264 | ||
265 | /* Skip zeros */ | |
266 | string++; | |
267 | continue; | |
268 | } | |
269 | ||
270 | valid_digits++; | |
271 | ||
272 | if (sign_of0x | |
273 | && ((valid_digits > 16) | |
274 | || ((valid_digits > 8) && mode32))) { | |
275 | /* | |
276 | * This is to_integer operation case. | |
277 | * No any restrictions for string-to-integer conversion, | |
278 | * see ACPI spec. | |
279 | */ | |
280 | goto error_exit; | |
281 | } | |
282 | ||
283 | /* Divide the digit into the correct position */ | |
284 | ||
285 | (void)acpi_ut_short_divide((dividend - (u64)this_digit), | |
286 | base, "ient, NULL); | |
287 | ||
288 | if (return_value > quotient) { | |
289 | if (to_integer_op) { | |
290 | goto error_exit; | |
291 | } else { | |
292 | break; | |
293 | } | |
294 | } | |
295 | ||
296 | return_value *= base; | |
297 | return_value += this_digit; | |
298 | string++; | |
299 | } | |
300 | ||
301 | /* All done, normal exit */ | |
302 | ||
303 | all_done: | |
304 | ||
305 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n", | |
306 | ACPI_FORMAT_UINT64(return_value))); | |
307 | ||
308 | *ret_integer = return_value; | |
309 | return_ACPI_STATUS(AE_OK); | |
310 | ||
311 | error_exit: | |
312 | /* Base was set/validated above */ | |
313 | ||
314 | if (base == 10) { | |
315 | return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT); | |
316 | } else { | |
317 | return_ACPI_STATUS(AE_BAD_HEX_CONSTANT); | |
318 | } | |
319 | } | |
320 | ||
321 | #if defined (ACPI_DEBUGGER) || defined (ACPI_APPLICATION) | |
322 | /******************************************************************************* | |
323 | * | |
324 | * FUNCTION: acpi_ut_safe_strcpy, acpi_ut_safe_strcat, acpi_ut_safe_strncat | |
325 | * | |
326 | * PARAMETERS: Adds a "DestSize" parameter to each of the standard string | |
327 | * functions. This is the size of the Destination buffer. | |
328 | * | |
329 | * RETURN: TRUE if the operation would overflow the destination buffer. | |
330 | * | |
331 | * DESCRIPTION: Safe versions of standard Clib string functions. Ensure that | |
332 | * the result of the operation will not overflow the output string | |
333 | * buffer. | |
334 | * | |
335 | * NOTE: These functions are typically only helpful for processing | |
336 | * user input and command lines. For most ACPICA code, the | |
337 | * required buffer length is precisely calculated before buffer | |
338 | * allocation, so the use of these functions is unnecessary. | |
339 | * | |
340 | ******************************************************************************/ | |
341 | ||
342 | u8 acpi_ut_safe_strcpy(char *dest, acpi_size dest_size, char *source) | |
343 | { | |
344 | ||
345 | if (strlen(source) >= dest_size) { | |
346 | return (TRUE); | |
347 | } | |
348 | ||
349 | strcpy(dest, source); | |
350 | return (FALSE); | |
351 | } | |
352 | ||
353 | u8 acpi_ut_safe_strcat(char *dest, acpi_size dest_size, char *source) | |
354 | { | |
355 | ||
356 | if ((strlen(dest) + strlen(source)) >= dest_size) { | |
357 | return (TRUE); | |
358 | } | |
359 | ||
360 | strcat(dest, source); | |
361 | return (FALSE); | |
362 | } | |
363 | ||
364 | u8 | |
365 | acpi_ut_safe_strncat(char *dest, | |
366 | acpi_size dest_size, | |
367 | char *source, acpi_size max_transfer_length) | |
368 | { | |
369 | acpi_size actual_transfer_length; | |
370 | ||
371 | actual_transfer_length = ACPI_MIN(max_transfer_length, strlen(source)); | |
372 | ||
373 | if ((strlen(dest) + actual_transfer_length) >= dest_size) { | |
374 | return (TRUE); | |
375 | } | |
376 | ||
377 | strncat(dest, source, max_transfer_length); | |
378 | return (FALSE); | |
379 | } | |
380 | #endif |