author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Wed, 13 Oct 2010 16:27:53 +0300 | |
branch | RCL_3 |
changeset 75 | 254b651f304e |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
0
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/*- |
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* Copyright (c) 1990, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 4. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* © Portions copyright (c) 2005 Nokia Corporation. All rights reserved. |
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*/ |
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|
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#if defined(LIBC_SCCS) && !defined(lint) |
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static char sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93"; |
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#endif /* LIBC_SCCS and not lint */ |
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#include <sys/cdefs.h> |
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#ifndef __SYMBIAN32__ |
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__FBSDID("$FreeBSD: src/lib/libc/stdlib/strtol.c,v 1.19 2005/01/21 13:31:02 ache Exp $"); |
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#endif |
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|
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#include <limits.h> |
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#include <ctype.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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|
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|
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/* |
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* Convert a string to a long integer. |
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* |
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* Assumes that the upper and lower case |
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* alphabets and digits are each contiguous. |
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*/ |
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EXPORT_C |
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long |
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strtol(const char * __restrict nptr, char ** __restrict endptr, int base) |
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{ |
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const char *s; |
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unsigned long acc; |
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char c; |
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unsigned long cutoff; |
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int neg, any, cutlim; |
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|
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/* |
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* Skip white space and pick up leading +/- sign if any. |
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* If base is 0, allow 0x for hex and 0 for octal, else |
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* assume decimal; if base is already 16, allow 0x. |
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*/ |
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s = nptr; |
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do { |
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c = *s++; |
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} while (isspace((unsigned char)c)); |
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if (c == '-') { |
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neg = 1; |
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c = *s++; |
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} else { |
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neg = 0; |
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if (c == '+') |
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c = *s++; |
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} |
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if ((base == 0 || base == 16) && |
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c == '0' && (*s == 'x' || *s == 'X') && |
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((s[1] >= '0' && s[1] <= '9') || |
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(s[1] >= 'A' && s[1] <= 'F') || |
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(s[1] >= 'a' && s[1] <= 'f'))) { |
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c = s[1]; |
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s += 2; |
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base = 16; |
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} |
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if (base == 0) |
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base = c == '0' ? 8 : 10; |
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acc = any = 0; |
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if (base < 2 || base > 36) |
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goto noconv; |
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92 |
|
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93 |
/* |
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* Compute the cutoff value between legal numbers and illegal |
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* numbers. That is the largest legal value, divided by the |
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* base. An input number that is greater than this value, if |
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* followed by a legal input character, is too big. One that |
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* is equal to this value may be valid or not; the limit |
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* between valid and invalid numbers is then based on the last |
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* digit. For instance, if the range for longs is |
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* [-2147483648..2147483647] and the input base is 10, |
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102 |
* cutoff will be set to 214748364 and cutlim to either |
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103 |
* 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated |
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104 |
* a value > 214748364, or equal but the next digit is > 7 (or 8), |
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105 |
* the number is too big, and we will return a range error. |
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106 |
* |
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107 |
* Set 'any' if any `digits' consumed; make it negative to indicate |
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108 |
* overflow. |
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109 |
*/ |
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110 |
cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX |
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111 |
: LONG_MAX; |
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112 |
cutlim = cutoff % base; |
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113 |
cutoff /= base; |
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114 |
for ( ; ; c = *s++) { |
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115 |
if (c >= '0' && c <= '9') |
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116 |
c -= '0'; |
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117 |
else if (c >= 'A' && c <= 'Z') |
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118 |
c -= 'A' - 10; |
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119 |
else if (c >= 'a' && c <= 'z') |
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120 |
c -= 'a' - 10; |
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121 |
else |
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122 |
break; |
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123 |
if (c >= base) |
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124 |
break; |
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125 |
if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) |
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126 |
any = -1; |
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127 |
else { |
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128 |
any = 1; |
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129 |
acc *= base; |
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130 |
acc += c; |
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131 |
} |
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132 |
} |
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133 |
if (any < 0) { |
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134 |
acc = neg ? LONG_MIN : LONG_MAX; |
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135 |
errno = ERANGE; |
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136 |
} else if (!any) { |
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137 |
noconv: |
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138 |
errno = EINVAL; |
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139 |
} else if (neg) |
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140 |
acc = -acc; |
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141 |
if (endptr != NULL) |
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142 |
*endptr = (char *)(any ? s - 1 : nptr); |
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143 |
return (acc); |
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144 |
} |