319 lines
9.4 KiB
C
319 lines
9.4 KiB
C
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/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_BASE_STRINGUTILS_H__
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#define WEBRTC_BASE_STRINGUTILS_H__
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#if defined(WEBRTC_WIN)
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#include <malloc.h>
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#include <wchar.h>
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#define alloca _alloca
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#endif // WEBRTC_WIN
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#if defined(WEBRTC_POSIX)
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#ifdef BSD
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#include <stdlib.h>
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#else // BSD
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#include <alloca.h>
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#endif // !BSD
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#endif // WEBRTC_POSIX
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#include <string>
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#include "webrtc/base/basictypes.h"
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///////////////////////////////////////////////////////////////////////////////
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// Generic string/memory utilities
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///////////////////////////////////////////////////////////////////////////////
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#define STACK_ARRAY(TYPE, LEN) static_cast<TYPE*>(::alloca((LEN)*sizeof(TYPE)))
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namespace rtc {
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// Complement to memset. Verifies memory consists of count bytes of value c.
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bool memory_check(const void* memory, int c, size_t count);
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// Determines whether the simple wildcard pattern matches target.
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// Alpha characters in pattern match case-insensitively.
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// Asterisks in pattern match 0 or more characters.
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// Ex: string_match("www.TEST.GOOGLE.COM", "www.*.com") -> true
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bool string_match(const char* target, const char* pattern);
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} // namespace rtc
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///////////////////////////////////////////////////////////////////////////////
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// Rename a bunch of common string functions so they are consistent across
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// platforms and between char and wchar_t variants.
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// Here is the full list of functions that are unified:
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// strlen, strcmp, stricmp, strncmp, strnicmp
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// strchr, vsnprintf, strtoul, tolowercase
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// tolowercase is like tolower, but not compatible with end-of-file value
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//
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// It's not clear if we will ever use wchar_t strings on unix. In theory,
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// all strings should be Utf8 all the time, except when interfacing with Win32
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// APIs that require Utf16.
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///////////////////////////////////////////////////////////////////////////////
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inline char tolowercase(char c) {
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return static_cast<char>(tolower(c));
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}
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#if defined(WEBRTC_WIN)
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inline size_t strlen(const wchar_t* s) {
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return wcslen(s);
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}
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inline int strcmp(const wchar_t* s1, const wchar_t* s2) {
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return wcscmp(s1, s2);
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}
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inline int stricmp(const wchar_t* s1, const wchar_t* s2) {
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return _wcsicmp(s1, s2);
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}
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inline int strncmp(const wchar_t* s1, const wchar_t* s2, size_t n) {
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return wcsncmp(s1, s2, n);
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}
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inline int strnicmp(const wchar_t* s1, const wchar_t* s2, size_t n) {
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return _wcsnicmp(s1, s2, n);
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}
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inline const wchar_t* strchr(const wchar_t* s, wchar_t c) {
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return wcschr(s, c);
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}
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inline const wchar_t* strstr(const wchar_t* haystack, const wchar_t* needle) {
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return wcsstr(haystack, needle);
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}
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#ifndef vsnprintf
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inline int vsnprintf(wchar_t* buf, size_t n, const wchar_t* fmt, va_list args) {
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return _vsnwprintf(buf, n, fmt, args);
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}
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#endif // !vsnprintf
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inline unsigned long strtoul(const wchar_t* snum, wchar_t** end, int base) {
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return wcstoul(snum, end, base);
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}
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inline wchar_t tolowercase(wchar_t c) {
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return static_cast<wchar_t>(towlower(c));
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}
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#endif // WEBRTC_WIN
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#if defined(WEBRTC_POSIX)
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inline int _stricmp(const char* s1, const char* s2) {
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return strcasecmp(s1, s2);
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}
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inline int _strnicmp(const char* s1, const char* s2, size_t n) {
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return strncasecmp(s1, s2, n);
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}
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#endif // WEBRTC_POSIX
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///////////////////////////////////////////////////////////////////////////////
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// Traits simplifies porting string functions to be CTYPE-agnostic
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///////////////////////////////////////////////////////////////////////////////
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namespace rtc {
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const size_t SIZE_UNKNOWN = static_cast<size_t>(-1);
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template<class CTYPE>
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struct Traits {
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// STL string type
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//typedef XXX string;
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// Null-terminated string
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//inline static const CTYPE* empty_str();
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};
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///////////////////////////////////////////////////////////////////////////////
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// String utilities which work with char or wchar_t
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///////////////////////////////////////////////////////////////////////////////
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template<class CTYPE>
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inline const CTYPE* nonnull(const CTYPE* str, const CTYPE* def_str = NULL) {
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return str ? str : (def_str ? def_str : Traits<CTYPE>::empty_str());
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}
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template<class CTYPE>
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const CTYPE* strchr(const CTYPE* str, const CTYPE* chs) {
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for (size_t i=0; str[i]; ++i) {
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for (size_t j=0; chs[j]; ++j) {
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if (str[i] == chs[j]) {
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return str + i;
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}
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}
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}
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return 0;
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}
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template<class CTYPE>
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const CTYPE* strchrn(const CTYPE* str, size_t slen, CTYPE ch) {
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for (size_t i=0; i<slen && str[i]; ++i) {
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if (str[i] == ch) {
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return str + i;
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}
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}
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return 0;
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}
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template<class CTYPE>
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size_t strlenn(const CTYPE* buffer, size_t buflen) {
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size_t bufpos = 0;
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while (buffer[bufpos] && (bufpos < buflen)) {
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++bufpos;
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}
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return bufpos;
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}
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// Safe versions of strncpy, strncat, snprintf and vsnprintf that always
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// null-terminate.
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template<class CTYPE>
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size_t strcpyn(CTYPE* buffer, size_t buflen,
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const CTYPE* source, size_t srclen = SIZE_UNKNOWN) {
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if (buflen <= 0)
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return 0;
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if (srclen == SIZE_UNKNOWN) {
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srclen = strlenn(source, buflen - 1);
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} else if (srclen >= buflen) {
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srclen = buflen - 1;
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}
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memcpy(buffer, source, srclen * sizeof(CTYPE));
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buffer[srclen] = 0;
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return srclen;
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}
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template<class CTYPE>
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size_t strcatn(CTYPE* buffer, size_t buflen,
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const CTYPE* source, size_t srclen = SIZE_UNKNOWN) {
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if (buflen <= 0)
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return 0;
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size_t bufpos = strlenn(buffer, buflen - 1);
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return bufpos + strcpyn(buffer + bufpos, buflen - bufpos, source, srclen);
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}
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// Some compilers (clang specifically) require vsprintfn be defined before
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// sprintfn.
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template<class CTYPE>
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size_t vsprintfn(CTYPE* buffer, size_t buflen, const CTYPE* format,
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va_list args) {
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int len = vsnprintf(buffer, buflen, format, args);
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if ((len < 0) || (static_cast<size_t>(len) >= buflen)) {
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len = static_cast<int>(buflen - 1);
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buffer[len] = 0;
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}
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return len;
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}
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template<class CTYPE>
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size_t sprintfn(CTYPE* buffer, size_t buflen, const CTYPE* format, ...);
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template<class CTYPE>
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size_t sprintfn(CTYPE* buffer, size_t buflen, const CTYPE* format, ...) {
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va_list args;
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va_start(args, format);
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size_t len = vsprintfn(buffer, buflen, format, args);
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va_end(args);
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return len;
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}
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///////////////////////////////////////////////////////////////////////////////
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// Allow safe comparing and copying ascii (not UTF-8) with both wide and
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// non-wide character strings.
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///////////////////////////////////////////////////////////////////////////////
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inline int asccmp(const char* s1, const char* s2) {
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return strcmp(s1, s2);
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}
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inline int ascicmp(const char* s1, const char* s2) {
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return _stricmp(s1, s2);
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}
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inline int ascncmp(const char* s1, const char* s2, size_t n) {
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return strncmp(s1, s2, n);
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}
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inline int ascnicmp(const char* s1, const char* s2, size_t n) {
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return _strnicmp(s1, s2, n);
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}
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inline size_t asccpyn(char* buffer, size_t buflen,
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const char* source, size_t srclen = SIZE_UNKNOWN) {
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return strcpyn(buffer, buflen, source, srclen);
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}
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#if defined(WEBRTC_WIN)
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typedef wchar_t(*CharacterTransformation)(wchar_t);
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inline wchar_t identity(wchar_t c) { return c; }
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int ascii_string_compare(const wchar_t* s1, const char* s2, size_t n,
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CharacterTransformation transformation);
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inline int asccmp(const wchar_t* s1, const char* s2) {
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return ascii_string_compare(s1, s2, static_cast<size_t>(-1), identity);
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}
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inline int ascicmp(const wchar_t* s1, const char* s2) {
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return ascii_string_compare(s1, s2, static_cast<size_t>(-1), tolowercase);
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}
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inline int ascncmp(const wchar_t* s1, const char* s2, size_t n) {
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return ascii_string_compare(s1, s2, n, identity);
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}
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inline int ascnicmp(const wchar_t* s1, const char* s2, size_t n) {
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return ascii_string_compare(s1, s2, n, tolowercase);
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}
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size_t asccpyn(wchar_t* buffer, size_t buflen,
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const char* source, size_t srclen = SIZE_UNKNOWN);
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#endif // WEBRTC_WIN
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///////////////////////////////////////////////////////////////////////////////
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// Traits<char> specializations
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///////////////////////////////////////////////////////////////////////////////
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template<>
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struct Traits<char> {
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typedef std::string string;
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inline static const char* empty_str() { return ""; }
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};
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///////////////////////////////////////////////////////////////////////////////
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// Traits<wchar_t> specializations (Windows only, currently)
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///////////////////////////////////////////////////////////////////////////////
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#if defined(WEBRTC_WIN)
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template<>
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struct Traits<wchar_t> {
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typedef std::wstring string;
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inline static const wchar_t* empty_str() { return L""; }
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};
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#endif // WEBRTC_WIN
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// Replaces all occurrences of "search" with "replace".
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void replace_substrs(const char *search,
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size_t search_len,
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const char *replace,
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size_t replace_len,
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std::string *s);
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// True iff s1 starts with s2.
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bool starts_with(const char *s1, const char *s2);
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// True iff s1 ends with s2.
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bool ends_with(const char *s1, const char *s2);
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// Remove leading and trailing whitespaces.
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std::string string_trim(const std::string& s);
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} // namespace rtc
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#endif // WEBRTC_BASE_STRINGUTILS_H__
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