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39 | |
40 | #ifndef QV4STRINGTOARRAYINDEX_P_H |
41 | #define QV4STRINGTOARRAYINDEX_P_H |
42 | |
43 | // |
44 | // W A R N I N G |
45 | // ------------- |
46 | // |
47 | // This file is not part of the Qt API. It exists purely as an |
48 | // implementation detail. This header file may change from version to |
49 | // version without notice, or even be removed. |
50 | // |
51 | // We mean it. |
52 | // |
53 | |
54 | #include <QtCore/private/qnumeric_p.h> |
55 | #include <QtCore/qstring.h> |
56 | #include <limits> |
57 | |
58 | QT_BEGIN_NAMESPACE |
59 | |
60 | namespace QV4 { |
61 | |
62 | inline uint charToUInt(const QChar *ch) { return ch->unicode(); } |
63 | inline uint charToUInt(const char *ch) { return static_cast<unsigned char>(*ch); } |
64 | |
65 | template <typename T> |
66 | uint stringToArrayIndex(const T *ch, const T *end) |
67 | { |
68 | uint i = charToUInt(ch) - '0'; |
69 | if (i > 9) |
70 | return std::numeric_limits<uint>::max(); |
71 | ++ch; |
72 | // reject "01", "001", ... |
73 | if (i == 0 && ch != end) |
74 | return std::numeric_limits<uint>::max(); |
75 | |
76 | while (ch < end) { |
77 | uint x = charToUInt(ch) - '0'; |
78 | if (x > 9) |
79 | return std::numeric_limits<uint>::max(); |
80 | if (mul_overflow(v1: i, v2: uint(10), r: &i) || add_overflow(v1: i, v2: x, r: &i)) // i = i * 10 + x |
81 | return std::numeric_limits<uint>::max(); |
82 | ++ch; |
83 | } |
84 | return i; |
85 | } |
86 | |
87 | inline uint stringToArrayIndex(const QString &str) |
88 | { |
89 | return stringToArrayIndex(ch: str.constData(), end: str.constData() + str.length()); |
90 | } |
91 | |
92 | } // namespace QV4 |
93 | |
94 | QT_END_NAMESPACE |
95 | |
96 | #endif // QV4STRINGTOARRAYINDEX_P_H |
97 | |