87 lines
2.0 KiB
C++
87 lines
2.0 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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class Printer
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{
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public:
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enum { MAX_BUF_SIZE = 4096};
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Printer(): limit_(MAX_BUF_SIZE), pos_(0)
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{
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memset(buf_, 0, MAX_BUF_SIZE);
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}
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~Printer()
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{
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pos_ = 0;
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}
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void reset()
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{
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pos_ = 0;
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*buf_ = 0;
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}
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char *get_str() { return NULL != buf_ && limit_ > 0 ? buf_ : NULL; }
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char *append(const char *format, ...)
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{
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char *src = NULL;
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int64_t count = 0;
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va_list ap;
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va_start(ap, format);
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if (NULL != buf_ && limit_ > 0 && pos_ < limit_
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&& pos_ + (count = vsnprintf(buf_ + pos_, limit_ - pos_, format, ap)) < limit_) {
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src = buf_ + pos_;
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pos_ += count;
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}
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va_end(ap);
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return src;
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}
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char *new_str(const char *format, ...)
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{
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char *src = NULL;
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int64_t count = 0;
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va_list ap;
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va_start(ap, format);
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if (NULL != buf_ && limit_ > 0 && pos_ < limit_
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&& pos_ + (count = vsnprintf(buf_ + pos_, limit_ - pos_, format, ap)) + 1 < limit_) {
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src = buf_ + pos_;
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pos_ += count + 1;
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}
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va_end(ap);
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return src;
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}
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private:
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char buf_[MAX_BUF_SIZE];
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int64_t limit_;
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int64_t pos_;
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};
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class Tokenizer
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{
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public:
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Tokenizer(char* str, const char* delim): str_(str), delim_(delim), saveptr_(NULL)
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{}
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~Tokenizer() {}
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const char* next() {
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char* ret = NULL;
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if (NULL == saveptr_) {
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ret = strtok_r(str_, delim_, &saveptr_);
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} else {
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ret = strtok_r(NULL, delim_, &saveptr_);
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}
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return ret;
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}
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private:
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char* str_;
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const char* delim_;
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char* saveptr_;
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};
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