/usr/include/boost/pending/stringtok.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | // (C) Copyright Jeremy Siek 2004
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_STRINGTOK_HPP
#define BOOST_STRINGTOK_HPP
/*
* stringtok.hpp -- Breaks a string into tokens. This is an example for lib3.
*
* Template function looks like this:
*
* template <typename Container>
* void stringtok (Container &l,
* string const &s,
* char const * const ws = " \t\n");
*
* A nondestructive version of strtok() that handles its own memory and can
* be broken up by any character(s). Does all the work at once rather than
* in an invocation loop like strtok() requires.
*
* Container is any type that supports push_back(a_string), although using
* list<string> and deque<string> are indicated due to their O(1) push_back.
* (I prefer deque<> because op[]/at() is available as well.) The first
* parameter references an existing Container.
*
* s is the string to be tokenized. From the parameter declaration, it can
* be seen that s is not affected. Since references-to-const may refer to
* temporaries, you could use stringtok(some_container, readline("")) when
* using the GNU readline library.
*
* The final parameter is an array of characters that serve as whitespace.
* Whitespace characters default to one or more of tab, space, and newline,
* in any combination.
*
* 'l' need not be empty on entry. On return, 'l' will have the token
* strings appended.
*
*
* [Example:
* list<string> ls;
* stringtok (ls, " this \t is\t\n a test ");
* for (list<string>::const_iterator i = ls.begin();
* i != ls.end(); ++i)
* {
* cerr << ':' << (*i) << ":\n";
* }
*
* would print
* :this:
* :is:
* :a:
* :test:
* -end example]
*
* pedwards@jaj.com May 1999
*/
#include <string>
#include <cstring> // for strchr
/*****************************************************************
* This is the only part of the implementation that I don't like.
* It can probably be improved upon by the reader...
*/
inline bool
isws (char c, char const * const wstr)
{
using namespace std;
return (strchr(wstr,c) != NULL);
}
namespace boost {
/*****************************************************************
* Simplistic and quite Standard, but a bit slow. This should be
* templatized on basic_string instead, or on a more generic StringT
* that just happens to support ::size_type, .substr(), and so on.
* I had hoped that "whitespace" would be a trait, but it isn't, so
* the user must supply it. Enh, this lets them break up strings on
* different things easier than traits would anyhow.
*/
template <typename Container>
void
stringtok (Container &l, std::string const &s, char const * const ws = " \t\n")
{
typedef std::string::size_type size_type;
const size_type S = s.size();
size_type i = 0;
while (i < S) {
// eat leading whitespace
while ((i < S) && (isws(s[i],ws))) ++i;
if (i == S) return; // nothing left but WS
// find end of word
size_type j = i+1;
while ((j < S) && (!isws(s[j],ws))) ++j;
// add word
l.push_back(s.substr(i,j-i));
// set up for next loop
i = j+1;
}
}
} // namespace boost
#endif // BOOST_STRINGTOK_HPP
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