SmallString.h revision 0861d1fa5c1c8ca2adb8af1df0b3fce8f6d3ba5b 
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  SmallString &operator+=(const char *RHS) {
50    this->append(RHS, RHS+strlen(RHS));
51    return *this;
52  }
53  SmallString &operator+=(char C) {
54    this->push_back(C);
55    return *this;
56  }
57
58  SmallString &append_uint_32(uint32_t N) {
59    char Buffer[20];
60    char *BufPtr = Buffer+20;
61
62    if (N == 0) *--BufPtr = '0';  // Handle special case.
63
64    while (N) {
65      *--BufPtr = '0' + char(N % 10);
66      N /= 10;
67    }
68    this->append(BufPtr, Buffer+20);
69    return *this;
70  }
71
72  SmallString &append_uint(uint64_t N) {
73    if (N == uint32_t(N))
74      return append_uint_32(uint32_t(N));
75
76    char Buffer[40];
77    char *BufPtr = Buffer+40;
78
79    if (N == 0) *--BufPtr = '0';  // Handle special case...
80
81    while (N) {
82      *--BufPtr = '0' + char(N % 10);
83      N /= 10;
84    }
85
86    this->append(BufPtr, Buffer+40);
87    return *this;
88  }
89
90  SmallString &append_sint(int64_t N) {
91    // TODO, wrong for minint64.
92    if (N < 0) {
93      this->push_back('-');
94      N = -N;
95    }
96    return append_uint(N);
97  }
98
99};
100
101
102}
103
104#endif
105