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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/strcasestr.h"
#if defined(__sun)
#include <dlfcn.h>
#include "mongo/base/init.h"
#include "mongo/base/status.h"
#endif
#if defined(_WIN32) || defined(__sun)
#include <algorithm>
#include <cctype>
#include <cstring>
#include <string>
#if defined(__sun)
#define STRCASESTR_EMULATION_NAME strcasestr_emulation
#else
#define STRCASESTR_EMULATION_NAME strcasestr
#endif
namespace mongo {
namespace pal {
/**
* strcasestr -- case-insensitive search for a substring within another string.
*
* @param haystack ptr to C-string to search
* @param needle ptr to C-string to try to find within 'haystack'
* @return ptr to start of 'needle' within 'haystack' if found, NULL otherwise
*/
const char* STRCASESTR_EMULATION_NAME(const char* haystack, const char* needle) {
std::string haystackLower(haystack);
std::transform(haystackLower.begin(), haystackLower.end(), haystackLower.begin(), ::tolower);
std::string needleLower(needle);
std::transform(needleLower.begin(), needleLower.end(), needleLower.begin(), ::tolower);
// Use strstr() to find 'lowercased needle' in 'lowercased haystack'
// If found, use the location to compute the matching location in the original string
// If not found, return NULL
const char* haystackLowerStart = haystackLower.c_str();
const char* location = strstr(haystackLowerStart, needleLower.c_str());
return location ? (haystack + (location - haystackLowerStart)) : NULL;
}
#if defined(__sun)
typedef const char* (*StrCaseStrFunc)(const char* haystack, const char* needle);
static StrCaseStrFunc strcasestr_switcher = mongo::pal::strcasestr_emulation;
const char* strcasestr(const char* haystack, const char* needle) {
return strcasestr_switcher(haystack, needle);
}
#endif // #if defined(__sun)
} // namespace pal
} // namespace mongo
#endif // #if defined(_WIN32) || defined(__sun)
#if defined(__sun)
namespace mongo {
// 'strcasestr()' on Solaris will call the emulation if the symbol is not found
//
MONGO_INITIALIZER_GENERAL(SolarisStrCaseCmp, MONGO_NO_PREREQUISITES, ("default"))
(InitializerContext* context) {
void* functionAddress = dlsym(RTLD_DEFAULT, "strcasestr");
if (functionAddress != NULL) {
mongo::pal::strcasestr_switcher =
reinterpret_cast<mongo::pal::StrCaseStrFunc>(functionAddress);
}
return Status::OK();
}
} // namespace mongo
#endif // __sun
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