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premiere-libtorrent
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string operations optimizations in client_test

This commit is contained in:
Arvid Norberg 2007-05-23 07:39:21 +00:00
parent 3a27e51720
commit 4bcf8b53ff
1 changed files with 31 additions and 24 deletions
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55
examples/client_test.cpp
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@ -147,17 +147,18 @@ void clear_home()
#endif #endif
std::string esc(char const* code) char const* esc(char const* code)
{ {
static char ret[20] = "\033[";
#ifdef ANSI_TERMINAL_COLORS #ifdef ANSI_TERMINAL_COLORS
std::string ret; int i = 2;
ret += char(0x1b); int j = 0;
ret += "["; while (code[j]) ret[i++] = code[j++];
ret += code; ret[i++] = 'm';
ret += "m"; ret[i++] = 0;
return ret; return ret;
#else #else
return std::string(); return "";
#endif #endif
} }
@ -171,15 +172,13 @@ std::string to_string(int v, int width)
return s.str(); return s.str();
} }
std::string to_string(float v, int width, int precision = 3) std::string const& to_string(float v, int width, int precision = 3)
{ {
std::stringstream s; static std::string ret;
s.precision(precision); ret.resize(20);
s.flags(std::ios_base::right); int size = std::sprintf(&ret[0], "%*.*f", width, precision, v);
s.width(width); ret.resize(std::min(size, width));
s.fill(' '); return ret;
s << v;
return s.str();
} }
std::string pos_to_string(float v, int width, int precision = 4) std::string pos_to_string(float v, int width, int precision = 4)
@ -214,30 +213,38 @@ std::string ratio(float a, float b)
return s.str(); return s.str();
} }
std::string add_suffix(float val) std::string const& add_suffix(float val)
{ {
const char* prefix[] = {"B", "kB", "MB", "GB", "TB"}; static std::string ret;
const char* prefix[] = {"kB", "MB", "GB", "TB"};
const int num_prefix = sizeof(prefix) / sizeof(const char*); const int num_prefix = sizeof(prefix) / sizeof(const char*);
for (int i = 0; i < num_prefix; ++i) for (int i = 0; i < num_prefix; ++i)
{ {
if (fabs(val) < 1000.f)
return to_string(val, i==0?5:4) + prefix[i];
val /= 1000.f; val /= 1000.f;
if (fabs(val) < 1000.f)
{
ret = to_string(val, 4);
ret += prefix[i];
return ret;
}
} }
return to_string(val, 6) + "PB"; ret = to_string(val, 4);
ret += "PB";
return ret;
} }
std::string progress_bar(float progress, int width, char const* code = "33") std::string const& progress_bar(float progress, int width, char const* code = "33")
{ {
std::string bar; static std::string bar;
bar.reserve(width); bar.clear();
bar.reserve(width + 10);
int progress_chars = static_cast<int>(progress * width + .5f); int progress_chars = static_cast<int>(progress * width + .5f);
bar = esc(code); bar = esc(code);
std::fill_n(std::back_inserter(bar), progress_chars, '#'); std::fill_n(std::back_inserter(bar), progress_chars, '#');
bar += esc("0"); bar += esc("0");
std::fill_n(std::back_inserter(bar), width - progress_chars, '-'); std::fill_n(std::back_inserter(bar), width - progress_chars, '-');
return std::string(bar.begin(), bar.end()); return bar;
} }
int peer_index(libtorrent::tcp::endpoint addr, std::vector<libtorrent::peer_info> const& peers) int peer_index(libtorrent::tcp::endpoint addr, std::vector<libtorrent::peer_info> const& peers)