- string.inc
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/**
* vim: set ts=4 :
* =============================================================================
* SourceMod (C)2004-2008 AlliedModders LLC. All rights reserved.
* =============================================================================
*
* This file is part of the SourceMod/SourcePawn SDK.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 3.0, as published by the
* Free Software Foundation.
*
* 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 GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, AlliedModders LLC gives you permission to link the
* code of this program (as well as its derivative works) to "Half-Life 2," the
* "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
* by the Valve Corporation. You must obey the GNU General Public License in
* all respects for all other code used. Additionally, AlliedModders LLC grants
* this exception to all derivative works. AlliedModders LLC defines further
* exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
* or <http://www.sourcemod.net/license.php>.
*
* Version: $Id$
*/
#if defined _string_included
#endinput
#endif
#define _string_included
/**
* @global Unless otherwise noted, all string functions which take in a
* writable buffer and maximum length should have the null terminator INCLUDED
* in the length. This means that this is valid:
* strcopy(string, sizeof(string), ...)
*/
/**
* Calculates the length of a string.
*
* @param str String to check.
* @return Number of valid character bytes in the string.
*/
native int strlen(const char[] str);
/**
* Tests whether a string is found inside another string.
*
* @param str String to search in.
* @param substr Substring to find inside the original string.
* @param caseSensitive If true (default), search is case sensitive.
* If false, search is case insensitive.
* @return -1 on failure (no match found). Any other value
* indicates a position in the string where the match starts.
*/
native int StrContains(const char[] str, const char[] substr, bool caseSensitive=true);
/**
* Compares two strings lexographically.
*
* @param str1 First string (left).
* @param str2 Second string (right).
* @param caseSensitive If true (default), comparison is case sensitive.
* If false, comparison is case insensitive.
* @return -1 if str1 < str2
* 0 if str1 == str2
* 1 if str1 > str2
*/
native int strcmp(const char[] str1, const char[] str2, bool caseSensitive=true);
/**
* Compares two strings parts lexographically.
*
* @param str1 First string (left).
* @param str2 Second string (right).
* @param num Number of characters to compare.
* @param caseSensitive If true (default), comparison is case sensitive.
* If false, comparison is case insensitive.
* @return -1 if str1 < str2
* 0 if str1 == str2
* 1 if str1 > str2
*/
native int strncmp(const char[] str1, const char[] str2, int num, bool caseSensitive=true);
/**
* Backwards compatible stock - StrCompare is now strcmp
* @deprecated Renamed to strcmp
*/
#pragma deprecated Use strcmp() instead
stock int StrCompare(const char[] str1, const char[] str2, bool caseSensitive=true)
{
return strcmp(str1, str2, caseSensitive);
}
/**
* Returns whether two strings are equal.
*
* @param str1 First string (left).
* @param str2 Second string (right).
* @param caseSensitive If true (default), comparison is case sensitive.
* If false, comparison is case insensitive.
* @return True if equal, false otherwise.
*/
stock bool StrEqual(const char[] str1, const char[] str2, bool caseSensitive=true)
{
return (strcmp(str1, str2, caseSensitive) == 0);
}
/**
* Copies one string to another string.
* @note If the destination buffer is too small to hold the source string, the
* destination will be truncated.
*
* @param dest Destination string buffer to copy to.
* @param destLen Destination buffer length (includes null terminator).
* @param source Source string buffer to copy from.
* @return Number of characters written to the buffer,
* not including the null terminator.
*/
native int strcopy(char[] dest, int destLen, const char[] source);
/**
* Backwards compatibility stock - use strcopy
* @deprecated Renamed to strcopy
*/
#pragma deprecated Use strcopy() instead
stock int StrCopy(char[] dest, int destLen, const char[] source)
{
return strcopy(dest, destLen, source);
}
/**
* Formats a string according to the SourceMod format rules (see documentation).
*
* @param buffer Destination string buffer.
* @param maxlength Maximum length of output string buffer,
* including the null terminator.
* @param format Formatting rules.
* @param ... Variable number of format parameters.
* @return Number of characters written to the buffer,
* not including the null terminator.
*/
native int Format(char[] buffer, int maxlength, const char[] format, any ...);
/**
* Formats a string according to the SourceMod format rules (see documentation).
* @note This is the same as Format(), except none of the input buffers can
* overlap the same memory as the output buffer. Since this security
* check is removed, it is slightly faster.
*
* @param buffer Destination string buffer.
* @param maxlength Maximum length of output string buffer,
* including the null terminator.
* @param format Formatting rules.
* @param ... Variable number of format parameters.
* @return Number of characters written to the buffer,
* not including the null terminator.
*/
native int FormatEx(char[] buffer, int maxlength, const char[] format, any ...);
/**
* Formats a string according to the SourceMod format rules (see documentation).
* @note This is the same as Format(), except it grabs parameters from a
* parent parameter stack, rather than a local. This is useful for
* implementing your own variable argument functions.
*
* @param buffer Destination string buffer.
* @param maxlength Maximum length of output string buffer,
* including the null terminator.
* @param format Formatting rules.
* @param varpos Argument number which contains the '...' symbol.
* Note: Arguments start at 1.
* @return Number of bytes written.
* @error Invalid argument index.
*/
native int VFormat(char[] buffer, int maxlength, const char[] format, int varpos);
/**
* Converts a string to an integer.
*
* @param str String to convert.
* @param nBase Numerical base to use. 10 is default.
* @return Integer conversion of string, or 0 on failure.
*/
native int StringToInt(const char[] str, int nBase=10);
/**
* Converts a string to an integer with some more options.
*
* @param str String to convert.
* @param result Variable to store the result in.
* @param nBase Numerical base to use. 10 is default.
* @return Number of characters consumed.
*/
native int StringToIntEx(const char[] str, int &result, int nBase=10);
/**
* Converts a string to a 64-bit integer.
*
* @param str String to convert.
* @param result Array to store the upper and lower
* 32-bits of the 64-bit integer.
* @param nBase Numerical base to use. 10 is default.
* @return Number of characters consumed.
*/
native int StringToInt64(const char[] str, int result[2], int nBase=10);
/**
* Converts an integer to a string.
*
* @param num Integer to convert.
* @param str Buffer to store string in.
* @param maxlength Maximum length of string buffer.
* @return Number of characters written to the buffer,
* not including the null terminator.
*/
native int IntToString(int num, char[] str, int maxlength);
/**
* Converts a 64-bit integer to a string.
*
* @param num Array containing the upper and lower
* 32-bits of a 64-bit integer.
* @param str Buffer to store string in.
* @param maxlength Maximum length of string buffer.
* @return Number of characters written to the buffer,
* not including the null terminator.
*/
native int Int64ToString(const int num[2], char[] str, int maxlength);
/**
* Converts a string to a floating point number.
*
* @param str String to convert to a float.
* @return Floating point result, or 0.0 on error.
*/
native float StringToFloat(const char[] str);
/**
* Converts a string to a floating point number with some more options.
*
* @param str String to convert to a float.
* @param result Variable to store result in.
* @return Number of characters consumed.
*/
native int StringToFloatEx(const char[] str, float &result);
/**
* Converts a floating point number to a string.
*
* @param num Floating point number to convert.
* @param str Buffer to store string in.
* @param maxlength Maximum length of string buffer.
* @return Number of characters written to the buffer,
* not including the null terminator.
*/
native int FloatToString(float num, char[] str, int maxlength);
/**
* Finds the first "argument" in a string; either a set of space
* terminated characters, or a fully quoted string. After the
* argument is found, whitespace is read until the next portion
* of the string is reached. If nothing remains, -1 is returned.
* Otherwise, the index to the first character is returned.
*
* @param source Source input string.
* @param arg Stores argument read from string.
* @param argLen Maximum length of argument buffer.
* @return Index to next piece of string, or -1 if none.
*/
native int BreakString(const char[] source, char[] arg, int argLen);
/**
* Backwards compatibility stock - use BreakString
* @deprecated Renamed to BreakString.
*/
#pragma deprecated Use BreakString() instead
stock int StrBreak(const char[] source, char[] arg, int argLen)
{
return BreakString(source, arg, argLen);
}
/**
* Removes whitespace characters from the beginning and end of a string.
*
* @param str The string to trim.
* @return Number of bytes written (UTF-8 safe).
*/
native int TrimString(char[] str);
/**
* Returns text in a string up until a certain character sequence is reached.
*
* @param source Source input string.
* @param split A string which specifies a search point to break at.
* @param part Buffer to store string part.
* @param partLen Maximum length of the string part buffer.
* @return -1 if no match was found; otherwise, an index into source
* marking the first index after the searched text. The
* index is always relative to the start of the input string.
*/
native int SplitString(const char[] source, const char[] split, char[] part, int partLen);
/**
* Given a string, replaces all occurrences of a search string with a
* replacement string.
*
* @param text String to perform search and replacements on.
* @param maxlength Maximum length of the string buffer.
* @param search String to search for.
* @param replace String to replace the search string with.
* @param caseSensitive If true (default), search is case sensitive.
* @return Number of replacements that were performed.
* @error 'search' parameter is empty.
*/
native int ReplaceString(char[] text, int maxlength, const char[] search, const char[] replace, bool caseSensitive=true);
/**
* Given a string, replaces the first occurrence of a search string with a
* replacement string.
*
* @param text String to perform search and replacements on.
* @param maxlength Maximum length of the string buffer.
* @param search String to search for.
* @param replace String to replace the search string with.
* @param searchLen If higher than -1, its value will be used instead of
* a strlen() call on the search parameter.
* @param replaceLen If higher than -1, its value will be used instead of
* a strlen() call on the replace parameter.
* @param caseSensitive If true (default), search is case sensitive.
* @return Index into the buffer (relative to the start) from where
* the last replacement ended, or -1 if no replacements were
* made.
* @error 'search' parameter is empty.
*/
native int ReplaceStringEx(char[] text, int maxlength, const char[] search, const char[] replace, int searchLen=-1, int replaceLen=-1, bool caseSensitive=true);
/**
* Returns the number of bytes a character is using. This is
* for multi-byte characters (UTF-8). For normal ASCII characters,
* this will return 1.
*
* @param source Source input string.
* @return Number of bytes the current character uses.
*/
native int GetCharBytes(const char[] source);
/**
* Returns whether a character is an ASCII alphabet character.
*
* @note Multi-byte characters will always return false.
*
* @param chr Character to test.
* @return True if character is alphabetical, otherwise false.
*/
native bool IsCharAlpha(int chr);
/**
* Returns whether a character is numeric.
*
* @note Multi-byte characters will always return false.
*
* @param chr Character to test.
* @return True if character is numeric, otherwise false.
*/
native bool IsCharNumeric(int chr);
/**
* Returns whether a character is whitespace.
*
* @note Multi-byte characters will always return false.
*
* @param chr Character to test.
* @return True if character is whitespace, otherwise false.
*/
native bool IsCharSpace(int chr);
/**
* Returns if a character is multi-byte or not.
*
* @param chr Character to test.
* @return 0 for a normal 7-bit ASCII character,
* otherwise number of bytes in multi-byte character.
*/
native int IsCharMB(int chr);
/**
* Returns whether an alphabetic character is uppercase.
*
* @note Multi-byte characters will always return false.
*
* @param chr Character to test.
* @return True if character is uppercase, otherwise false.
*/
native bool IsCharUpper(int chr);
/**
* Returns whether an alphabetic character is lowercase.
*
* @note Multi-byte characters will always return false.
*
* @param chr Character to test.
* @return True if character is lowercase, otherwise false.
*/
native bool IsCharLower(int chr);
/**
* Strips a quote pair off a string if it exists. That is, the following
* replace rule is applied once: ^"(.*)"$ -> ^\1$
*
* Note that the leading and trailing quotes will only be removed if both
* exist. Otherwise, the string is left unmodified. This function should
* be considered O(k) (all characters get shifted down).
*
* @param text String to modify (in place).
* @return True if string was modified, false if there was no
* set of quotes.
*/
native bool StripQuotes(char[] text);
/**
* Converts a lowercase character to its uppercase counterpart.
*
* @param chr Character to convert.
* @return Uppercase character on success,
* no change on failure.
*/
stock int CharToUpper(int chr)
{
if (IsCharLower(chr))
{
return (chr & ~(1<<5));
}
return chr;
}
/**
* Converts an uppercase character to its lowercase counterpart.
*
* @param chr Character to convert.
* @return Lowercase character on success,
* no change on failure.
*/
stock int CharToLower(int chr)
{
if (IsCharUpper(chr))
{
return (chr | (1<<5));
}
return chr;
}
/**
* Finds the first occurrence of a character in a string.
*
* @param str String.
* @param c Character to search for.
* @param reverse False (default) to search forward, true to search
* backward.
* @return The index of the first occurrence of the character
* in the string, or -1 if the character was not found.
*/
stock int FindCharInString(const char[] str, char c, bool reverse = false)
{
int len = strlen(str);
if (!reverse)
{
for (int i = 0; i < len; i++)
{
if (str[i] == c)
{
return i;
}
}
}
else
{
for (int i = len - 1; i >= 0; i--)
{
if (str[i] == c)
{
return i;
}
}
}
return -1;
}
/**
* Concatenates one string onto another.
*
* @param buffer String to append to.
* @param maxlength Maximum length of entire buffer.
* @param source Source string to concatenate.
* @return Number of bytes written.
*/
stock int StrCat(char[] buffer, int maxlength, const char[] source)
{
int len = strlen(buffer);
if (len >= maxlength)
{
return 0;
}
return Format(buffer[len], maxlength-len, "%s", source);
}
/**
* Breaks a string into pieces and stores each piece into an array of buffers.
*
* @param text The string to split.
* @param split The string to use as a split delimiter.
* @param buffers An array of string buffers (2D array).
* @param maxStrings Number of string buffers (first dimension size).
* @param maxStringLength Maximum length of each string buffer.
* @param copyRemainder False (default) discard excess pieces, true to ignore
* delimiters after last piece.
* @return Number of strings retrieved.
*/
stock int ExplodeString(const char[] text, const char[] split, char[][] buffers, int maxStrings,
int maxStringLength, bool copyRemainder = false)
{
int reloc_idx, idx, total;
if (maxStrings < 1 || !split[0])
{
return 0;
}
while ((idx = SplitString(text[reloc_idx], split, buffers[total], maxStringLength)) != -1)
{
reloc_idx += idx;
if (++total == maxStrings)
{
if (copyRemainder)
{
strcopy(buffers[total-1], maxStringLength, text[reloc_idx-idx]);
}
return total;
}
}
strcopy(buffers[total++], maxStringLength, text[reloc_idx]);
return total;
}
/**
* Joins an array of strings into one string, with a "join" string inserted in
* between each given string. This function complements ExplodeString.
*
* @param strings An array of strings.
* @param numStrings Number of strings in the array.
* @param join The join string to insert between each string.
* @param buffer Output buffer to write the joined string to.
* @param maxLength Maximum length of the output buffer.
* @return Number of bytes written to the output buffer.
*/
stock int ImplodeStrings(const char[][] strings, int numStrings, const char[] join, char[] buffer, int maxLength)
{
int total, length, part_length;
int join_length = strlen(join);
for (int i=0; i<numStrings; i++)
{
length = strcopy(buffer[total], maxLength-total, strings[i]);
total += length;
if (length < part_length)
{
break;
}
if (i != numStrings - 1)
{
length = strcopy(buffer[total], maxLength-total, join);
total += length;
if (length < join_length)
{
break;
}
}
}
return total;
}