SmallString.h revision cd2b4c1846413c7e4f46e8a08b1aa94212089053 
1//===- llvm/ADT/SmallString.h - 'Normally small' strings --------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the SmallString class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_ADT_SMALLSTRING_H
15#define LLVM_ADT_SMALLSTRING_H
16
17#include "llvm/ADT/SmallVector.h"
18#include "llvm/Support/DataTypes.h"
19#include <cstring>
20
21namespace llvm {
22
23/// SmallString - A SmallString is just a SmallVector with methods and accessors
24/// that make it work better as a string (e.g. operator+ etc).
25template<unsigned InternalLen>
26class SmallString : public SmallVector<char, InternalLen> {
27public:
28  // Default ctor - Initialize to empty.
29  SmallString() {}
30
31  // Initialize with a range.
32  template<typename ItTy>
33  SmallString(ItTy S, ItTy E) : SmallVector<char, InternalLen>(S, E) {}
34
35  // Copy ctor.
36  SmallString(const SmallString &RHS) : SmallVector<char, InternalLen>(RHS) {}
37
38
39  // Extra methods.
40  const char *c_str() const {
41    SmallString *This = const_cast<SmallString*>(this);
42    // Ensure that there is a \0 at the end of the string.
43    This->reserve(this->size()+1);
44    This->End[0] = 0;
45    return this->begin();
46  }
47
48  // Extra operators.
49  const SmallString &operator=(const char *RHS) {
50    this->clear();
51    return *this += RHS;
52  }
53
54  SmallString &operator+=(const char *RHS) {
55    this->append(RHS, RHS+strlen(RHS));
56    return *this;
57  }
58  SmallString &operator+=(char C) {
59    this->push_back(C);
60    return *this;
61  }
62
63  SmallString &append_uint_32(uint32_t N) {
64    char Buffer[20];
65    char *BufPtr = Buffer+20;
66
67    if (N == 0) *--BufPtr = '0';  // Handle special case.
68
69    while (N) {
70      *--BufPtr = '0' + char(N % 10);
71      N /= 10;
72    }
73    this->append(BufPtr, Buffer+20);
74    return *this;
75  }
76
77  SmallString &append_uint(uint64_t N) {
78    if (N == uint32_t(N))
79      return append_uint_32(uint32_t(N));
80
81    char Buffer[40];
82    char *BufPtr = Buffer+40;
83
84    if (N == 0) *--BufPtr = '0';  // Handle special case...
85
86    while (N) {
87      *--BufPtr = '0' + char(N % 10);
88      N /= 10;
89    }
90
91    this->append(BufPtr, Buffer+40);
92    return *this;
93  }
94
95  SmallString &append_sint(int64_t N) {
96    if (N < 0) {
97      this->push_back('-');
98      N = -N;
99    }
100    return append_uint((uint64_t)N);
101  }
102
103};
104
105
106}
107
108#endif
109