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Diffstat (limited to 'ipc/chromium/src/base/string_util.h')
| -rw-r--r-- | ipc/chromium/src/base/string_util.h | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/string_util.h b/ipc/chromium/src/base/string_util.h new file mode 100644 index 0000000000..066a3fb678 --- /dev/null +++ b/ipc/chromium/src/base/string_util.h @@ -0,0 +1,231 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. +// +// This file defines utility functions for working with strings. + +#ifndef BASE_STRING_UTIL_H_ +#define BASE_STRING_UTIL_H_ + +#include <stdarg.h> // va_list +#include <ctype.h> + +#include <string> +#include <vector> + +#include "base/basictypes.h" +#include "base/string16.h" +#include "base/string_piece.h" // For implicit conversions. + +// Safe standard library wrappers for all platforms. + +namespace base { + +// C standard-library functions like "strncasecmp" and "snprintf" that aren't +// cross-platform are provided as "base::strncasecmp", and their prototypes +// are listed below. These functions are then implemented as inline calls +// to the platform-specific equivalents in the platform-specific headers. + +// Compare the two strings s1 and s2 without regard to case using +// the current locale; returns 0 if they are equal, 1 if s1 > s2, and -1 if +// s2 > s1 according to a lexicographic comparison. +int strcasecmp(const char* s1, const char* s2); + +// Compare up to count characters of s1 and s2 without regard to case using +// the current locale; returns 0 if they are equal, 1 if s1 > s2, and -1 if +// s2 > s1 according to a lexicographic comparison. +int strncasecmp(const char* s1, const char* s2, size_t count); + +// Wrapper for vsnprintf that always null-terminates and always returns the +// number of characters that would be in an untruncated formatted +// string, even when truncation occurs. +int vsnprintf(char* buffer, size_t size, const char* format, va_list arguments); + +// vswprintf always null-terminates, but when truncation occurs, it will either +// return -1 or the number of characters that would be in an untruncated +// formatted string. The actual return value depends on the underlying +// C library's vswprintf implementation. +int vswprintf(wchar_t* buffer, size_t size, const wchar_t* format, + va_list arguments); + +// Some of these implementations need to be inlined. + +inline int snprintf(char* buffer, size_t size, const char* format, ...) { + va_list arguments; + va_start(arguments, format); + int result = vsnprintf(buffer, size, format, arguments); + va_end(arguments); + return result; +} + +inline int swprintf(wchar_t* buffer, size_t size, const wchar_t* format, ...) { + va_list arguments; + va_start(arguments, format); + int result = vswprintf(buffer, size, format, arguments); + va_end(arguments); + return result; +} + +// BSD-style safe and consistent string copy functions. +// Copies |src| to |dst|, where |dst_size| is the total allocated size of |dst|. +// Copies at most |dst_size|-1 characters, and always NULL terminates |dst|, as +// long as |dst_size| is not 0. Returns the length of |src| in characters. +// If the return value is >= dst_size, then the output was truncated. +// NOTE: All sizes are in number of characters, NOT in bytes. +size_t strlcpy(char* dst, const char* src, size_t dst_size); +size_t wcslcpy(wchar_t* dst, const wchar_t* src, size_t dst_size); + +// Scan a wprintf format string to determine whether it's portable across a +// variety of systems. This function only checks that the conversion +// specifiers used by the format string are supported and have the same meaning +// on a variety of systems. It doesn't check for other errors that might occur +// within a format string. +// +// Nonportable conversion specifiers for wprintf are: +// - 's' and 'c' without an 'l' length modifier. %s and %c operate on char +// data on all systems except Windows, which treat them as wchar_t data. +// Use %ls and %lc for wchar_t data instead. +// - 'S' and 'C', which operate on wchar_t data on all systems except Windows, +// which treat them as char data. Use %ls and %lc for wchar_t data +// instead. +// - 'F', which is not identified by Windows wprintf documentation. +// - 'D', 'O', and 'U', which are deprecated and not available on all systems. +// Use %ld, %lo, and %lu instead. +// +// Note that there is no portable conversion specifier for char data when +// working with wprintf. +// +// This function is intended to be called from base::vswprintf. +bool IsWprintfFormatPortable(const wchar_t* format); + +} // namespace base + +#if defined(OS_WIN) +# include "base/string_util_win.h" +#elif defined(OS_POSIX) +# include "base/string_util_posix.h" +#else +# error Define string operations appropriately for your platform +#endif + +// Trims any whitespace from either end of the input string. Returns where +// whitespace was found. +// The non-wide version has two functions: +// * TrimWhitespaceASCII() +// This function is for ASCII strings and only looks for ASCII whitespace; +// * TrimWhitespaceUTF8() +// This function is for UTF-8 strings and looks for Unicode whitespace. +// Please choose the best one according to your usage. +// NOTE: Safe to use the same variable for both input and output. +enum TrimPositions { + TRIM_NONE = 0, + TRIM_LEADING = 1 << 0, + TRIM_TRAILING = 1 << 1, + TRIM_ALL = TRIM_LEADING | TRIM_TRAILING +}; +TrimPositions TrimWhitespace(const std::wstring& input, TrimPositions positions, + std::wstring* output); +TrimPositions TrimWhitespaceASCII(const std::string& input, + TrimPositions positions, std::string* output); + +// Deprecated. This function is only for backward compatibility and calls +// TrimWhitespaceASCII(). +TrimPositions TrimWhitespace(const std::string& input, TrimPositions positions, + std::string* output); + +// Searches for CR or LF characters. Removes all contiguous whitespace +// strings that contain them. This is useful when trying to deal with text +// copied from terminals. +// Returns |text, with the following three transformations: +// (1) Leading and trailing whitespace is trimmed. +// (2) If |trim_sequences_with_line_breaks| is true, any other whitespace +// sequences containing a CR or LF are trimmed. +// (3) All other whitespace sequences are converted to single spaces. +std::wstring CollapseWhitespace(const std::wstring& text, + bool trim_sequences_with_line_breaks); + +// These convert between ASCII (7-bit) and Wide/UTF16 strings. +std::string WideToASCII(const std::wstring& wide); +std::wstring ASCIIToWide(const std::string& ascii); +std::string UTF16ToASCII(const string16& utf16); +string16 ASCIIToUTF16(const std::string& ascii); + +// These convert between UTF-8, -16, and -32 strings. They are potentially slow, +// so avoid unnecessary conversions. The low-level versions return a boolean +// indicating whether the conversion was 100% valid. In this case, it will still +// do the best it can and put the result in the output buffer. The versions that +// return strings ignore this error and just return the best conversion +// possible. +bool WideToUTF8(const wchar_t* src, size_t src_len, std::string* output); +std::string WideToUTF8(const std::wstring& wide); +bool UTF8ToWide(const char* src, size_t src_len, std::wstring* output); +std::wstring UTF8ToWide(const ::StringPiece& utf8); + +bool IsStringASCII(const std::wstring& str); +bool IsStringASCII(const std::string& str); +bool IsStringASCII(const string16& str); + +// Specialized string-conversion functions. +std::string IntToString(int value); +std::wstring IntToWString(int value); +std::string UintToString(unsigned int value); +std::wstring UintToWString(unsigned int value); +std::string Int64ToString(int64_t value); +std::wstring Int64ToWString(int64_t value); +std::string Uint64ToString(uint64_t value); +std::wstring Uint64ToWString(uint64_t value); +// The DoubleToString methods convert the double to a string format that +// ignores the locale. If you want to use locale specific formatting, use ICU. +std::string DoubleToString(double value); +std::wstring DoubleToWString(double value); + +// Perform a best-effort conversion of the input string to a numeric type, +// setting |*output| to the result of the conversion. Returns true for +// "perfect" conversions; returns false in the following cases: +// - Overflow/underflow. |*output| will be set to the maximum value supported +// by the data type. +// - Trailing characters in the string after parsing the number. |*output| +// will be set to the value of the number that was parsed. +// - No characters parseable as a number at the beginning of the string. +// |*output| will be set to 0. +// - Empty string. |*output| will be set to 0. +bool StringToInt(const std::string& input, int* output); +bool StringToInt(const string16& input, int* output); +bool StringToInt64(const std::string& input, int64_t* output); +bool StringToInt64(const string16& input, int64_t* output); + +// Convenience forms of the above, when the caller is uninterested in the +// boolean return value. These return only the |*output| value from the +// above conversions: a best-effort conversion when possible, otherwise, 0. +int StringToInt(const std::string& value); +int StringToInt(const string16& value); +int64_t StringToInt64(const std::string& value); +int64_t StringToInt64(const string16& value); + +// Return a C++ string given printf-like input. +std::string StringPrintf(const char* format, ...); +std::wstring StringPrintf(const wchar_t* format, ...); + +// Store result into a supplied string and return it +const std::string& SStringPrintf(std::string* dst, const char* format, ...); +const std::wstring& SStringPrintf(std::wstring* dst, const wchar_t* format, + ...); + +// Append result to a supplied string +void StringAppendF(std::string* dst, const char* format, ...); +void StringAppendF(std::wstring* dst, const wchar_t* format, ...); + +//----------------------------------------------------------------------------- + +// Splits |str| into a vector of strings delimited by |s|. Append the results +// into |r| as they appear. If several instances of |s| are contiguous, or if +// |str| begins with or ends with |s|, then an empty string is inserted. +// +// Every substring is trimmed of any leading or trailing white space. +void SplitString(const std::wstring& str, wchar_t s, + std::vector<std::wstring>* r); +void SplitString(const std::string& str, char s, std::vector<std::string>* r); + +#endif // BASE_STRING_UTIL_H_ |