gecko-dev/xpcom/base/nsCRTGlue.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsCRTGlue_h__
#define nsCRTGlue_h__

#include "nscore.h"

/**
 * Scan a string for the first character that is *not* in a set of
 * delimiters.  If the string is only delimiter characters, the end of the
 * string is returned.
 *
 * @param aDelims The set of delimiters (null-terminated)
 * @param aStr    The string to search (null-terminated)
 */
const char* NS_strspnp(const char* aDelims, const char* aStr);

/**
 * Tokenize a string. This function is similar to the strtok function in the
 * C standard library, but it does not use static variables to maintain state
 * and is therefore thread and reentrancy-safe.
 *
 * Any leading delimiters in str are skipped. Then the string is scanned
 * until an additional delimiter or end-of-string is found. The final
 * delimiter is set to '\0'.
 *
 * @param aDelims The set of delimiters.
 * @param aStr    The string to search. This is an in-out parameter; it is
 *                reset to the end of the found token + 1, or to the
 *                end-of-string if there are no more tokens.
 * @return        The token. If no token is found (the string is only
 *                delimiter characters), nullptr is returned.
 */
char* NS_strtok(const char* aDelims, char** aStr);

/**
 * "strlen" for char16_t strings
 */
uint32_t NS_strlen(const char16_t* aString);

/**
 * "strcmp" for char16_t strings
 */
int NS_strcmp(const char16_t* aStrA, const char16_t* aStrB);

/**
 * "strncmp" for char16_t strings
 */
int NS_strncmp(const char16_t* aStrA, const char16_t* aStrB, size_t aLen);

/**
 * "strdup" for char16_t strings, uses the infallible moz_xmalloc allocator.
 */
char16_t* NS_xstrdup(const char16_t* aString);

/**
 * "strdup", but using the infallible moz_xmalloc allocator.
 */
char* NS_xstrdup(const char* aString);

/**
 * strndup for char16_t or char strings (normal strndup is not available on
 * windows). This function will ensure that the new string is
 * null-terminated. Uses the infallible moz_xmalloc allocator.
 *
 * CharT may be either char16_t or char.
 */
template <typename CharT>
CharT* NS_xstrndup(const CharT* aString, uint32_t aLen);

// The following case-conversion methods only deal in the ascii repertoire
// A-Z and a-z

// semi-private data declarations... don't use these directly.
class nsLowerUpperUtils {
 public:
  static const unsigned char kLower2Upper[256];
  static const unsigned char kUpper2Lower[256];
};

inline char NS_ToUpper(char aChar) {
  return (char)nsLowerUpperUtils::kLower2Upper[(unsigned char)aChar];
}

inline char NS_ToLower(char aChar) {
  return (char)nsLowerUpperUtils::kUpper2Lower[(unsigned char)aChar];
}

bool NS_IsUpper(char aChar);
bool NS_IsLower(char aChar);

constexpr bool NS_IsAscii(const char* aString) {
  while (*aString) {
    if (0x80 & *aString) {
      return false;
    }
    aString++;
  }
  return true;
}

constexpr bool NS_IsAscii(const char* aString, uint32_t aLength) {
  const char* end = aString + aLength;
  while (aString < end) {
    if (0x80 & *aString) {
      return false;
    }
    aString++;
  }
  return true;
}

constexpr bool NS_IsAsciiWhitespace(char16_t aChar) {
  return aChar == ' ' || aChar == '\r' || aChar == '\n' || aChar == '\t';
}

#ifndef XPCOM_GLUE_AVOID_NSPR
void NS_MakeRandomString(char* aBuf, int32_t aBufLen);
#endif

#define FF '\f'
#define TAB '\t'

#define CRSTR "\015"
#define LFSTR "\012"
#define CRLF "\015\012" /* A CR LF equivalent string */

#if defined(ANDROID)
// On mobile devices, the file system may be very limited in what it
// considers valid characters. To avoid errors, sanitize conservatively.
#  define OS_FILE_ILLEGAL_CHARACTERS "/:*?\"<>|;,+=[]"
#else
// Otherwise, we use the most restrictive filesystem as our default set of
// illegal filename characters. This is currently Windows.
#  define OS_FILE_ILLEGAL_CHARACTERS "/:*?\"<>|"
#endif

// We also provide a list of all known file path separators for all filesystems.
// This can be used in replacement of FILE_PATH_SEPARATOR when you need to
// identify or replace all known path separators.
#define KNOWN_PATH_SEPARATORS "\\/"

#if defined(XP_MACOSX)
#  define FILE_PATH_SEPARATOR "/"
#elif defined(XP_WIN)
#  define FILE_PATH_SEPARATOR "\\"
#elif defined(XP_UNIX)
#  define FILE_PATH_SEPARATOR "/"
#else
#  error need_to_define_your_file_path_separator_and_maybe_illegal_characters
#endif

// Not all these control characters are illegal in all OSs, but we don't really
// want them appearing in filenames
#define CONTROL_CHARACTERS           \
  "\001\002\003\004\005\006\007"     \
  "\010\011\012\013\014\015\016\017" \
  "\020\021\022\023\024\025\026\027" \
  "\030\031\032\033\034\035\036\037" \
  "\177"                             \
  "\200\201\202\203\204\205\206\207" \
  "\210\211\212\213\214\215\216\217" \
  "\220\221\222\223\224\225\226\227" \
  "\230\231\232\233\234\235\236\237"

#define FILE_ILLEGAL_CHARACTERS CONTROL_CHARACTERS OS_FILE_ILLEGAL_CHARACTERS

#endif  // nsCRTGlue_h__