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--- String.zh: string-handling constants and functions ---
==========================================================

===============
-- Constants --
===============

 * Message ASCII Code
const int MSGC_LINEFEED			= 10
 * The ASCII value for '\n'

 * Message Format
const int MF_NONE				= 0
const int MF_STRING				= 1
const int MF_INT				= 2
const int MF_FLOAT				= 3
const int MF_NUM				= 4
const int MF_PTR				= 5
const int MF_CHAR				= 6
 * Entered directly into 'strcatf' and 'strncatf' as the format type for the
 * argument
 * Converted (respectively) from the '%n', '%s', '%i', '%f', '%d', '%p' and '%c'
 * format arguments in sprintf and printf (via the sprintf_MFCodeToInt function)

================================
-- Single Character Functions --
================================

bool isControlCode(int chr)
 * Returns true if 'chr' is in the control code range of ascii characters

bool isNumber(int chr)
 * Returns true if 'chr' is in the range of ascii characters '0' to '9'

bool isAlphabetic(int chr)
 * Returns true if 'chr' is an alphabetic character

bool isAlphaNumeric(int chr)
 * Returns true if 'chr' is an alphanumeric character

bool isHex(int chr)
 * Returns true if 'chr' is in the set { '0'-'9', 'A'-'F' , 'a'-'f' }

bool isUpperCase(int chr)
 * Returns true if 'chr' is an upper-case character

bool isLowerCase(int chr)
 * Returns true if 'chr' is a lower-case character
 
bool isSpace(int chr)
 * Returns true if 'chr' is a blank space

int UpperToLower(int chr)
 * Converts all upper case characters to lower case, leaving non-alphabetic
 * characters unchanged

int LowerToUpper(int chr)
 * Converts all lower case characters to upper case, leaving non-alphabetic
 * characters unchanged

int ConvertCase(int chr)
 * Converts lower case to upper case and upper case to lower case

=========================
-- Memory Manipulation --
=========================

 * Memory Set
void memset(int ptr[], int value, int n)
 * Sets block of memory of size 'n' pointed by 'ptr' to 'value'

 * Memory Copy
int memcpy(int dest[], int src[], int n)
 * Copys block of memory pointed by 'src' of size 'n' to 'dest' and returns
 * 'dest'

 * Memory Move
int memmove(int dest[], int src[], int n)
 * As memcpy, but uses a buffer so memory space can overlap

 * Array Set
void arrayset(int a[], int a0, int a1, int a2,...)
 * Assign all elements of array 'a'. Overloaded for up to 16 elements

=========================
-- String Manipulation --
=========================

 * String Copy
void strcpy(int dest[], int src[])
 * Copys string 'src' into string 'dest' without checking for overflow in 'dest'
void strncpy(int dest[], int src[], int n)
 * As strcpy, but only takes the first 'n' characters from src

 * Remove Characters
void remchr(int string[])
 * Remove all characters starting from pointer 'string'
void remnchr(int string[], int n)
 * Remove 'n' characters and shift the rest of the string back to pointer 'string'

 * String Length
int strlen(int string[])
 * Returns the length of string 'string'

 * String Concatenate
int strcat(int dest[], int src[])
 * Appends string 'src' onto string 'dest' (assuming dest has enough extra memory
 * allocated to allow the operation)
int strncat(int dest, int src, int n)
 * strcat for the first 'n' characters in src


-- String Searching --
======================

 * String Character
int strchr(int string[], int character)
 * Returns the position of the first occurence of 'character' in 'string',
 * or -1 if none are found

 * String Reverse Character
int strrchr(int string[], int character)
 * Returns the position of the last occurence of 'character' in 'string'
 * starting from the end, or -1 if none are found

 * String Sub-String
int strstr(int string[], int sub[])
 * Returns the position of the first occurence of sub-string 'sub' in 'string,
 * or -1 if sub is not found

 * String Span
int strspn(int str[], int keys[])
 * Returns the length of characters in 'str' before a character not contained in
 * 'keys' is found

 * String Complement Span
int strcspn(int str[], int keys[])
 * Returns the length of characters in 'str' before a character contained in
 * 'keys' is found


-- String Comparison --
=======================

 * String Compare
int strcmp(int str1[], int str2[])
 * Iterates through str1 and str2 until a character is found which is not the same in
 * both strings, and then returns > 0 if the character is larger in str1, and < 0 if it is
 * larger in str2. Returns 0 if the strings are equal
int strncmp(int str1[], int str2[], int n)
 * strcmp up to 'n' characters


-- Converting between variables and strings --
==============================================

 * ASCII to Integer
int atoi(int string[])
 * Returns the decimal integer pointed by 'string'

 * Integer Length
int ilen(int string[])
 * Returns the length of characters of the decimal integer pointed by 'string'

 * Hexadecimal ASCII to Integer
int xtoi(int string[])
 * Returns the (positive) hexadecimal integer pointed by 'string'

 * Hexadecimal Length
int xlen(int string[])
 * Returns the length of characters of the (positive) hexadecimal integer pointed by 'string'

 * ASCII to Float
float atof(int string[])
 * Returns the floating point number pointed by 'string'

 * Float Length
int flen(int string[])
 * Returns the length of characters of the floating point number pointed by 'string'

  * ASCII to Number
float aton(int string[])
 * Returns the number pointed by 'string', calling either atoi or atof depending on context

 * Number Length
int nlen(int string[])
 * Returns the length of characters of the number pointed by 'string', calling either
 * ilen or flen depending on context

 * Integer to ASCII
int itoa(int string[], int num)
 * Places integer 'num' into string 'string' without checking for overflow,
 * and returns the number of characters used

 * Float to ASCII
int ftoa(int string[], float num, bool printall)
 * Places float 'num' into string 'string' without checking for overflow,
 * and returns the number of characters used. If 'printall' is true, it will add 4 decimal places
 * regardless of the most significant digit

 * Number to ASCII
int ntoa(int string[], float num)
 * Checks whether 'num' is an integer or not, and calls the appropriate function
 
 * Find Nth instance of a specific char
 int ReturnStringCharPos(int str, int chr)
  * Locates the first instance of a specific character, and returns its index.


-- String Formatting --
=======================

 * String Concatenate Format
int strcatf(int dest[], int arg, int format)
 * Appends 'arg' onto 'dest' as the MF_ constant passed into 'format'
int strncatf(int dest[], int arg, int format, int n)
 * As strcatf, using only 'n' characters of 'arg'

 * String Print Format
void sprintf(int ret[], int formatstr[], int a0, int a1, int a2,...)
 * Prints string 'formatstr' into 'ret' according to the arguments inputted (see C function for reference),
 * returning the number of characters used. Does not check for overflow in 'ret'
 * Overloaded up to a maximum of 16 arguments. Enter the right number of arguments for your format string;
 * there is (currently) no way to check how many arguments have been entered or of what type they are
 * Currently supported arguments:
 * '%s' - String
 * '%i' - Integer
 * '%f' - Float
 * '%d' - Number (Integer/Float depending on context)
 * '%n' - Nothing
 * '%p' - Pointer Address
 * '%c' - Single character
 * '%x' - Hexadecimal Integer (lower case)
 * '%X' - Hexadecimal Integer (upper case)
 * '\n' places a line feed ASCII character into the string

 * Print Format
void printf(int formatstr[], int a0, int a1, int a2,...)
 * Uses a buffer to print the results of sprintf(formatstr,...) straight to allegro.log
 * Overloaded up to a maximum of 16 arguments
