strtonum.cpp@ 1349

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1	/* $Id: strtonum.cpp 1 1970-01-01 00:00:00Z vboxsync $ */
2	/** @file
3	* InnoTek Portable Runtime - String To Number Convertion.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#include <iprt/string.h>
27	#include <iprt/err.h>
28
29
30	/*******************************************************************************
31	* Global Variables *
32	*******************************************************************************/
33	/** 8-bit char -> digit. */
34	static const unsigned char g_auchDigits[256] =
35	{
36	255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
37	255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,255,255,255,255,255,255,
38	255, 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, 35,255,255,255,255,255,
39	255, 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, 35,255,255,255,255,255,
40	255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
41	255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
42	255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
43	255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255
44	};
45	/** Approximated overflow shift checks.
46	* @todo make the overflow stuff work for real. */
47	static const char g_auchShift[36] =
48	{
49	/* 0 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 */
50	64, 64, 63, 63, 62, 62, 61, 61, 60, 60, 59, 59, 58, 58, 57, 57, 56, 56, 55, 55, 54, 54, 53, 53, 52, 52, 51, 51, 50, 50, 49, 49, 50, 50, 51, 51
51	};
52
53	/*
54	#include <stdio.h>
55	int main()
56	{
57	int i;
58	printf("static const unsigned char g_auchDigits[256] =\n"
59	"{");
60	for (i = 0; i < 256; i++)
61	{
62	int ch = 255;
63	if (i >= '0' && i <= '9')
64	ch = i - '0';
65	else if (i >= 'a' && i <= 'z')
66	ch = i - 'a' + 10;
67	else if (i >= 'A' && i <= 'Z')
68	ch = i - 'A' + 10;
69	if (i == 0)
70	printf("\n %3d", ch);
71	else if ((i % 32) == 0)
72	printf(",\n %3d", ch);
73	else
74	printf(",%3d", ch);
75	}
76	printf("\n"
77	"};\n");
78	return 0;
79	}
80	*/
81
82
83
84	/**
85	* Converts a string representation of a number to a 64-bit unsigned number.
86	*
87	* @returns iprt status code.
88	* Warnings are used to indicate convertion problems.
89	* @param pszValue Pointer to the string value.
90	* @param ppszNext Where to store the pointer to the first char following the number. (Optional)
91	* @param uBase The base of the representation used.
92	* If the function will look for known prefixes before defaulting to 10.
93	* @param pu64 Where to store the converted number. (optional)
94	*/
95	RTDECL(int) RTStrToUInt64Ex(const char pszValue, char ppszNext, unsigned uBase, uint64_t pu64)
96	{
97	const char *psz = pszValue;
98
99	/*
100	* Positive/Negative stuff.
101	*/
102	bool fPositive = true;
103	for (;; psz++)
104	{
105	if (*psz == '+')
106	fPositive = true;
107	else if (*psz == '-')
108	fPositive = !fPositive;
109	else
110	break;
111	}
112
113	/*
114	* Check for hex prefix.
115	*/
116	if (!uBase)
117	{
118	if ( psz[0] == '0'
119	&& (psz[1] == 'x' \|\| psz[1] == 'X')
120	&& g_auchDigits[(unsigned char)psz[2]] < 16)
121	{
122	uBase = 16;
123	psz += 2;
124	}
125	else if ( psz[0] == '0'
126	&& g_auchDigits[(unsigned char)psz[1]] < 8)
127	{
128	uBase = 8;
129	psz++;
130	}
131	else
132	uBase = 10;
133	}
134	else if ( uBase == 16
135	&& psz[0] == '0'
136	&& (psz[1] == 'x' \|\| psz[1] == 'X')
137	&& g_auchDigits[(unsigned char)psz[2]] < 16)
138	psz += 2;
139
140	/*
141	* Interpret the value.
142	* Note: We only support ascii digits at this time... :-)
143	*/
144	int iShift = g_auchShift[uBase];
145	pszValue = psz; /* (Prefix and sign doesn't count in the digit counting.) */
146	int rc = VINF_SUCCESS;
147	uint64_t u64 = 0;
148	unsigned char uch;
149	while ((uch = (unsigned char)*psz) != 0)
150	{
151	unsigned char chDigit = g_auchDigits[uch];
152	if (chDigit >= uBase)
153	break;
154
155	uint64_t u64Prev = u64;
156	u64 *= uBase;
157	u64 += chDigit;
158	if (u64Prev > u64 \|\| (u64Prev >> iShift))
159	rc = VWRN_NUMBER_TOO_BIG;
160	psz++;
161	}
162
163	if (!fPositive)
164	{
165	if (rc == VINF_SUCCESS)
166	rc = VWRN_NEGATIVE_UNSIGNED;
167	u64 = -(int64_t)u64;
168	}
169
170	if (pu64)
171	*pu64 = u64;
172
173	if (psz == pszValue)
174	rc = VERR_NO_DIGITS;
175
176	if (ppszNext)
177	ppszNext = (char )psz;
178
179	return rc;
180	}
181
182
183	/**
184	* Converts a string representation of a number to a 64-bit unsigned number.
185	* The base is guessed.
186	*
187	* @returns 64-bit unsigned number on success.
188	* @returns 0 on failure.
189	* @param pszValue Pointer to the string value.
190	*/
191	RTDECL(uint64_t) RTStrToUInt64(const char *pszValue)
192	{
193	uint64_t u64;
194	int rc = RTStrToUInt64Ex(pszValue, NULL, 0, &u64);
195	if (RT_SUCCESS(rc))
196	return u64;
197	return 0;
198	}
199
200
201	/**
202	* Converts a string representation of a number to a 32-bit unsigned number.
203	*
204	* @returns iprt status code.
205	* Warnings are used to indicate convertion problems.
206	* @param pszValue Pointer to the string value.
207	* @param ppszNext Where to store the pointer to the first char following the number. (Optional)
208	* @param uBase The base of the representation used.
209	* If the function will look for known prefixes before defaulting to 10.
210	* @param pu32 Where to store the converted number. (optional)
211	*/
212	RTDECL(int) RTStrToUInt32Ex(const char pszValue, char ppszNext, unsigned uBase, uint32_t pu32)
213	{
214	uint64_t u64;
215	int rc = RTStrToUInt64Ex(pszValue, ppszNext, uBase, &u64);
216	if (rc == VINF_SUCCESS)
217	{
218	if (u64 & ~0xffffffffULL)
219	rc = VWRN_NUMBER_TOO_BIG;
220	}
221	if (pu32)
222	*pu32 = (uint32_t)u64;
223	return rc;
224	}
225
226
227	/**
228	* Converts a string representation of a number to a 64-bit unsigned number.
229	* The base is guessed.
230	*
231	* @returns 32-bit unsigned number on success.
232	* @returns 0 on failure.
233	* @param pszValue Pointer to the string value.
234	*/
235	RTDECL(uint32_t) RTStrToUInt32(const char *pszValue)
236	{
237	uint32_t u32;
238	int rc = RTStrToUInt32Ex(pszValue, NULL, 0, &u32);
239	if (RT_SUCCESS(rc))
240	return u32;
241	return 0;
242	}
243
244
245	/**
246	* Converts a string representation of a number to a 16-bit unsigned number.
247	*
248	* @returns iprt status code.
249	* Warnings are used to indicate convertion problems.
250	* @param pszValue Pointer to the string value.
251	* @param ppszNext Where to store the pointer to the first char following the number. (Optional)
252	* @param uBase The base of the representation used.
253	* If the function will look for known prefixes before defaulting to 10.
254	* @param pu16 Where to store the converted number. (optional)
255	*/
256	RTDECL(int) RTStrToUInt16Ex(const char pszValue, char ppszNext, unsigned uBase, uint16_t pu16)
257	{
258	uint64_t u64;
259	int rc = RTStrToUInt64Ex(pszValue, ppszNext, uBase, &u64);
260	if (rc == VINF_SUCCESS)
261	{
262	if (u64 & ~0xffffULL)
263	rc = VWRN_NUMBER_TOO_BIG;
264	}
265	if (pu16)
266	*pu16 = (uint16_t)u64;
267	return rc;
268	}
269
270
271	/**
272	* Converts a string representation of a number to a 16-bit unsigned number.
273	* The base is guessed.
274	*
275	* @returns 16-bit unsigned number on success.
276	* @returns 0 on failure.
277	* @param pszValue Pointer to the string value.
278	*/
279	RTDECL(uint16_t) RTStrToUInt16(const char *pszValue)
280	{
281	uint16_t u16;
282	int rc = RTStrToUInt16Ex(pszValue, NULL, 0, &u16);
283	if (RT_SUCCESS(rc))
284	return u16;
285	return 0;
286	}
287
288
289	/**
290	* Converts a string representation of a number to a 8-bit unsigned number.
291	*
292	* @returns iprt status code.
293	* Warnings are used to indicate convertion problems.
294	* @param pszValue Pointer to the string value.
295	* @param ppszNext Where to store the pointer to the first char following the number. (Optional)
296	* @param uBase The base of the representation used.
297	* If the function will look for known prefixes before defaulting to 10.
298	* @param pu8 Where to store the converted number. (optional)
299	*/
300	RTDECL(int) RTStrToUInt8Ex(const char pszValue, char ppszNext, unsigned uBase, uint8_t pu8)
301	{
302	uint64_t u64;
303	int rc = RTStrToUInt64Ex(pszValue, ppszNext, uBase, &u64);
304	if (rc == VINF_SUCCESS)
305	{
306	if (u64 & ~0xffULL)
307	rc = VWRN_NUMBER_TOO_BIG;
308	}
309	if (pu8)
310	*pu8 = (uint8_t)u64;
311	return rc;
312	}
313
314
315	/**
316	* Converts a string representation of a number to a 8-bit unsigned number.
317	* The base is guessed.
318	*
319	* @returns 8-bit unsigned number on success.
320	* @returns 0 on failure.
321	* @param pszValue Pointer to the string value.
322	*/
323	RTDECL(uint8_t) RTStrToUInt8(const char *pszValue)
324	{
325	uint8_t u8;
326	int rc = RTStrToUInt8Ex(pszValue, NULL, 0, &u8);
327	if (RT_SUCCESS(rc))
328	return u8;
329	return 0;
330	}
331
332
333
334
335
336
337
338	/**
339	* Converts a string representation of a number to a 64-bit signed number.
340	*
341	* @returns iprt status code.
342	* Warnings are used to indicate convertion problems.
343	* @param pszValue Pointer to the string value.
344	* @param ppszNext Where to store the pointer to the first char following the number. (Optional)
345	* @param uBase The base of the representation used.
346	* If the function will look for known prefixes before defaulting to 10.
347	* @param pi64 Where to store the converted number. (optional)
348	*/
349	RTDECL(int) RTStrToInt64Ex(const char pszValue, char ppszNext, unsigned uBase, int64_t pi64)
350	{
351	const char *psz = pszValue;
352
353	/*
354	* Positive/Negative stuff.
355	*/
356	bool fPositive = true;
357	for (;; psz++)
358	{
359	if (*psz == '+')
360	fPositive = true;
361	else if (*psz == '-')
362	fPositive = !fPositive;
363	else
364	break;
365	}
366
367	/*
368	* Check for hex prefix.
369	*/
370	if (!uBase)
371	{
372	if ( *psz == '0'
373	&& (psz[1] == 'x' \|\| psz[1] == 'X')
374	&& g_auchDigits[(unsigned char)psz[2]] < 16)
375	{
376	uBase = 16;
377	psz += 2;
378	}
379	else if ( *psz == '0'
380	&& g_auchDigits[(unsigned char)psz[1]] < 8)
381	{
382	uBase = 8;
383	psz++;
384	}
385	else
386	uBase = 10;
387	}
388	else if ( uBase == 16
389	&& *psz == '0'
390	&& (psz[1] == 'x' \|\| psz[1] == 'X')
391	&& g_auchDigits[(unsigned char)psz[2]] < 16)
392	psz += 2;
393
394	/*
395	* Interpret the value.
396	* Note: We only support ascii digits at this time... :-)
397	*/
398	//int iShift = g_auchShift[uBase];
399	pszValue = psz; /* (Prefix and sign doesn't count in the digit counting.) */
400	int rc = VINF_SUCCESS;
401	int64_t i64 = 0;
402	unsigned char uch;
403	while ((uch = (unsigned char)*psz) != 0)
404	{
405	unsigned char chDigit = g_auchDigits[uch];
406	if (chDigit >= uBase)
407	break;
408
409	int64_t i64Prev = i64;
410	i64 *= uBase;
411	i64 += chDigit;
412	if (i64Prev > i64/* \|\| (i64Prev >> iShift)*/)
413	rc = VWRN_NUMBER_TOO_BIG;
414	psz++;
415	}
416
417	if (!fPositive)
418	i64 = -i64;
419
420	if (pi64)
421	*pi64 = i64;
422
423	if (psz == pszValue)
424	rc = VERR_NO_DIGITS;
425
426	if (ppszNext)
427	ppszNext = (char )psz;
428
429	return rc;
430	}
431
432
433	/**
434	* Converts a string representation of a number to a 64-bit signed number.
435	* The base is guessed.
436	*
437	* @returns 64-bit signed number on success.
438	* @returns 0 on failure.
439	* @param pszValue Pointer to the string value.
440	*/
441	RTDECL(int64_t) RTStrToInt64(const char *pszValue)
442	{
443	int64_t i64;
444	int rc = RTStrToInt64Ex(pszValue, NULL, 0, &i64);
445	if (RT_SUCCESS(rc))
446	return i64;
447	return 0;
448	}
449
450
451	/**
452	* Converts a string representation of a number to a 32-bit signed number.
453	*
454	* @returns iprt status code.
455	* Warnings are used to indicate convertion problems.
456	* @param pszValue Pointer to the string value.
457	* @param ppszNext Where to store the pointer to the first char following the number. (Optional)
458	* @param uBase The base of the representation used.
459	* If the function will look for known prefixes before defaulting to 10.
460	* @param pi32 Where to store the converted number. (optional)
461	*/
462	RTDECL(int) RTStrToInt32Ex(const char pszValue, char ppszNext, unsigned uBase, int32_t pi32)
463	{
464	int64_t i64;
465	int rc = RTStrToInt64Ex(pszValue, ppszNext, uBase, &i64);
466	if (rc == VINF_SUCCESS)
467	{
468	int32_t i32 = (int32_t)i64;
469	if (i64 != (int64_t)i32)
470	rc = VWRN_NUMBER_TOO_BIG;
471	}
472	if (pi32)
473	*pi32 = (int32_t)i64;
474	return rc;
475	}
476
477
478	/**
479	* Converts a string representation of a number to a 32-bit signed number.
480	* The base is guessed.
481	*
482	* @returns 32-bit signed number on success.
483	* @returns 0 on failure.
484	* @param pszValue Pointer to the string value.
485	*/
486	RTDECL(int32_t) RTStrToInt32(const char *pszValue)
487	{
488	int32_t i32;
489	int rc = RTStrToInt32Ex(pszValue, NULL, 0, &i32);
490	if (RT_SUCCESS(rc))
491	return i32;
492	return 0;
493	}
494
495
496	/**
497	* Converts a string representation of a number to a 16-bit signed number.
498	*
499	* @returns iprt status code.
500	* Warnings are used to indicate convertion problems.
501	* @param pszValue Pointer to the string value.
502	* @param ppszNext Where to store the pointer to the first char following the number. (Optional)
503	* @param uBase The base of the representation used.
504	* If the function will look for known prefixes before defaulting to 10.
505	* @param pi16 Where to store the converted number. (optional)
506	*/
507	RTDECL(int) RTStrToInt16Ex(const char pszValue, char ppszNext, unsigned uBase, int16_t pi16)
508	{
509	int64_t i64;
510	int rc = RTStrToInt64Ex(pszValue, ppszNext, uBase, &i64);
511	if (rc == VINF_SUCCESS)
512	{
513	int16_t i16 = (int16_t)i64;
514	if (i64 != (int64_t)i16)
515	rc = VWRN_NUMBER_TOO_BIG;
516	}
517	if (pi16)
518	*pi16 = (int16_t)i64;
519	return rc;
520	}
521
522
523	/**
524	* Converts a string representation of a number to a 16-bit signed number.
525	* The base is guessed.
526	*
527	* @returns 16-bit signed number on success.
528	* @returns 0 on failure.
529	* @param pszValue Pointer to the string value.
530	*/
531	RTDECL(int16_t) RTStrToInt16(const char *pszValue)
532	{
533	int16_t i16;
534	int rc = RTStrToInt16Ex(pszValue, NULL, 0, &i16);
535	if (RT_SUCCESS(rc))
536	return i16;
537	return 0;
538	}
539
540
541	/**
542	* Converts a string representation of a number to a 8-bit signed number.
543	*
544	* @returns iprt status code.
545	* Warnings are used to indicate convertion problems.
546	* @param pszValue Pointer to the string value.
547	* @param ppszNext Where to store the pointer to the first char following the number. (Optional)
548	* @param uBase The base of the representation used.
549	* If the function will look for known prefixes before defaulting to 10.
550	* @param pi8 Where to store the converted number. (optional)
551	*/
552	RTDECL(int) RTStrToInt8Ex(const char pszValue, char ppszNext, unsigned uBase, int8_t pi8)
553	{
554	int64_t i64;
555	int rc = RTStrToInt64Ex(pszValue, ppszNext, uBase, &i64);
556	if (rc == VINF_SUCCESS)
557	{
558	int8_t i8 = (int8_t)i64;
559	if (i64 != (int64_t)i8)
560	rc = VWRN_NUMBER_TOO_BIG;
561	}
562	if (pi8)
563	*pi8 = (int8_t)i64;
564	return rc;
565	}
566
567
568	/**
569	* Converts a string representation of a number to a 8-bit signed number.
570	* The base is guessed.
571	*
572	* @returns 8-bit signed number on success.
573	* @returns 0 on failure.
574	* @param pszValue Pointer to the string value.
575	*/
576	RTDECL(int8_t) RTStrToInt8(const char *pszValue)
577	{
578	int8_t i8;
579	int rc = RTStrToInt8Ex(pszValue, NULL, 0, &i8);
580	if (RT_SUCCESS(rc))
581	return i8;
582	return 0;
583	}
584

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source: vbox/trunk/src/VBox/Runtime/strtonum.cpp@ 1349

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