StringExtras.h revision 63d64a80bcdab8481f5ea8127a637cb7fd1f1b0d 
1//===-- Support/StringExtras.h - Useful string functions --------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file was developed by the LLVM research group and is distributed under
6// the University of Illinois Open Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains some functions that are useful when dealing with strings.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef SUPPORT_STRINGEXTRAS_H
15#define SUPPORT_STRINGEXTRAS_H
16
17#include "Support/DataTypes.h"
18#include <string>
19#include <stdio.h>
20
21namespace llvm {
22
23static inline std::string utohexstr(uint64_t X) {
24  char Buffer[40];
25  char *BufPtr = Buffer+39;
26
27  *BufPtr = 0;                  // Null terminate buffer...
28  if (X == 0) *--BufPtr = '0';  // Handle special case...
29
30  while (X) {
31    unsigned char Mod = (unsigned char)X & 15;
32    if (Mod < 10)
33      *--BufPtr = '0' + Mod;
34    else
35      *--BufPtr = 'A' + Mod-10;
36    X >>= 4;
37  }
38  return std::string(BufPtr);
39}
40
41static inline std::string utostr(unsigned long long X, bool isNeg = false) {
42  char Buffer[40];
43  char *BufPtr = Buffer+39;
44
45  *BufPtr = 0;                  // Null terminate buffer...
46  if (X == 0) *--BufPtr = '0';  // Handle special case...
47
48  while (X) {
49    *--BufPtr = '0' + char(X % 10);
50    X /= 10;
51  }
52
53  if (isNeg) *--BufPtr = '-';   // Add negative sign...
54
55  return std::string(BufPtr);
56}
57
58static inline std::string itostr(int64_t X) {
59  if (X < 0)
60    return utostr(static_cast<uint64_t>(-X), true);
61  else
62    return utostr(static_cast<uint64_t>(X));
63}
64
65
66static inline std::string utostr(unsigned long X, bool isNeg = false) {
67  return utostr(static_cast<unsigned long long>(X), isNeg);
68}
69
70static inline std::string utostr(unsigned X, bool isNeg = false) {
71  char Buffer[20];
72  char *BufPtr = Buffer+19;
73
74  *BufPtr = 0;                  // Null terminate buffer...
75  if (X == 0) *--BufPtr = '0';  // Handle special case...
76
77  while (X) {
78    *--BufPtr = '0' + char(X % 10);
79    X /= 10;
80  }
81
82  if (isNeg) *--BufPtr = '-';   // Add negative sign...
83
84  return std::string(BufPtr);
85}
86
87static inline std::string itostr(int X) {
88  if (X < 0)
89    return utostr(static_cast<unsigned>(-X), true);
90  else
91    return utostr(static_cast<unsigned>(X));
92}
93
94static inline std::string ftostr(double V) {
95  char Buffer[200];
96  sprintf(Buffer, "%20.6e", V);
97  return Buffer;
98}
99
100
101/// getToken - This function extracts one token from source, ignoring any
102/// leading characters that appear in the Delimiters string, and ending the
103/// token at any of the characters that appear in the Delimiters string.  If
104/// there are no tokens in the source string, an empty string is returned.
105/// The Source source string is updated in place to remove the returned string
106/// and any delimiter prefix from it.
107std::string getToken(std::string &Source,
108                     const char *Delimiters = " \t\n\v\f\r");
109
110} // End llvm namespace
111
112#endif
113