SmallString.h revision 036a94ed61da276c23b59362fc586248d1d4289d 
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 <cstring>
19
20namespace llvm {
21
22/// SmallString - A SmallString is just a SmallVector with methods and accessors
23/// that make it work better as a string (e.g. operator+ etc).
24template<unsigned InternalLen>
25class SmallString : public SmallVector<char, InternalLen> {
26public:
27  // Default ctor - Initialize to empty.
28  SmallString() {}
29
30  // Initialize with a range.
31  template<typename ItTy>
32  SmallString(ItTy S, ItTy E) : SmallVector<char, InternalLen>(S, E) {}
33
34  // Copy ctor.
35  SmallString(const SmallString &RHS) : SmallVector<char, InternalLen>(RHS) {}
36
37
38  // Extra methods.
39  const char *c_str() const {
40    SmallString *This = const_cast<SmallString*>(this);
41    // Ensure that there is a \0 at the end of the string.
42    This->reserve(this->size()+1);
43    This->End[0] = 0;
44    return this->begin();
45  }
46
47  // Extra operators.
48  SmallString &operator+=(const char *RHS) {
49    this->append(RHS, RHS+strlen(RHS));
50    return *this;
51  }
52  SmallString &operator+=(char C) {
53    this->push_back(C);
54    return *this;
55  }
56
57  SmallString &append_uint_32(uint32_t N) {
58    char Buffer[20];
59    char *BufPtr = Buffer+20;
60
61    if (N == 0) *--BufPtr = '0';  // Handle special case.
62
63    while (N) {
64      *--BufPtr = '0' + char(N % 10);
65      N /= 10;
66    }
67    this->append(BufPtr, Buffer+20);
68    return *this;
69  }
70
71  SmallString &append_uint(uint64_t N) {
72    if (N == uint32_t(N))
73      return append_uint_32(uint32_t(N));
74
75    char Buffer[40];
76    char *BufPtr = Buffer+40;
77
78    if (N == 0) *--BufPtr = '0';  // Handle special case...
79
80    while (N) {
81      *--BufPtr = '0' + char(N % 10);
82      N /= 10;
83    }
84
85    this->append(BufPtr, Buffer+40);
86    return *this;
87  }
88
89  SmallString &append_sint(int64_t N) {
90    // TODO, wrong for minint64.
91    if (N < 0) {
92      this->push_back('-');
93      N = -N;
94    }
95    return append_uint(N);
96  }
97
98};
99
100
101}
102
103#endif
104