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author | jorlow@chromium.org <jorlow@chromium.org@62dab493-f737-651d-591e-8d6aee1b9529> | 2011-03-18 22:37:00 +0000 |
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committer | jorlow@chromium.org <jorlow@chromium.org@62dab493-f737-651d-591e-8d6aee1b9529> | 2011-03-18 22:37:00 +0000 |
commit | f67e15e50f392625b4097caf22e8be1b0fe96013 (patch) | |
tree | 1cb1764c7627f9bac27ed0e0abf27010156e5007 /util/logging.cc | |
parent | 54f1fd7eef101db1dfb2bb66a59083c45a38aa4a (diff) | |
download | leveldb-f67e15e50f392625b4097caf22e8be1b0fe96013.tar.gz |
Initial checkin.
git-svn-id: https://leveldb.googlecode.com/svn/trunk@2 62dab493-f737-651d-591e-8d6aee1b9529
Diffstat (limited to 'util/logging.cc')
-rw-r--r-- | util/logging.cc | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/util/logging.cc b/util/logging.cc new file mode 100644 index 0000000..6b7c410 --- /dev/null +++ b/util/logging.cc @@ -0,0 +1,81 @@ +// Copyright (c) 2011 The LevelDB Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "util/logging.h" + +#include <errno.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include "include/env.h" +#include "include/slice.h" + +namespace leveldb { + +void AppendNumberTo(std::string* str, uint64_t num) { + char buf[30]; + snprintf(buf, sizeof(buf), "%llu", (unsigned long long) num); + str->append(buf); +} + +void AppendEscapedStringTo(std::string* str, const Slice& value) { + for (int i = 0; i < value.size(); i++) { + char c = value[i]; + if (c >= ' ' && c <= '~') { + str->push_back(c); + } else { + char buf[10]; + snprintf(buf, sizeof(buf), "\\x%02x", + static_cast<unsigned int>(c) & 0xff); + str->append(buf); + } + } +} + +std::string NumberToString(uint64_t num) { + std::string r; + AppendNumberTo(&r, num); + return r; +} + +std::string EscapeString(const Slice& value) { + std::string r; + AppendEscapedStringTo(&r, value); + return r; +} + +bool ConsumeChar(Slice* in, char c) { + if (!in->empty() && (*in)[0] == c) { + in->remove_prefix(1); + return true; + } else { + return false; + } +} + +bool ConsumeDecimalNumber(Slice* in, uint64_t* val) { + uint64_t v = 0; + int digits = 0; + while (!in->empty()) { + char c = (*in)[0]; + if (c >= '0' && c <= '9') { + ++digits; + const int delta = (c - '0'); + static const uint64_t kMaxUint64 = ~static_cast<uint64_t>(0); + if (v > kMaxUint64/10 || + (v == kMaxUint64/10 && delta > kMaxUint64%10)) { + // Overflow + return false; + } + v = (v * 10) + delta; + in->remove_prefix(1); + } else { + break; + } + } + *val = v; + return (digits > 0); +} + +} |