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colors.c / colors.h
To convert in-game player name colors to html display.
References used:
http://www.rapidtables.com/convert/color/hsl-to-rgb.htm
http://www.rapidtables.com/convert/color/rgb-to-hsl.htm
https://gitlab.com/xonotic/xonstat/blob/master/xonstat/util.py
Overview:
This component is slightly based on util.py of XonStats, but the only functionality needed is coloring the player's names. Since C programming language does not have standard libraries for color model conversions and regex, some functionality had to be self written. The function of interest is:
def html_colors(qstr='', limit=None):
This component uses purely C standard library.
Advanced string manipulations such as replace and concatenation are avoided.
Instead, strings are printed in parts across functions.
There is only one instance of dynamic memory allocation.
void print_plname(const char *)
It both allocates, near the start, and frees memory at the end.
darkplaces Player Names & Colors
Players can add color themes to their names. They're expressed either decimal or hexidecimal.
The decimal format follows
A character '^' that is not displayed, followed by a single digit between 0 and 9.
The hexidecimal format follows
A string '^x' that is not displayed, followed by 3 digits between 0 - 0xF.
Python Regex to C Translation
The snippets from the original python code:
_all_colors = re.compile(r'\^(\d|x[\dA-Fa-f]{3})')
_dec_colors = re.compile(r'\^(\d)')
_hex_colors = re.compile(r'\^x([\dA-Fa-f])([\dA-Fa-f])([\dA-Fa-f])')
_dec_spans = [
"<span style='color:rgb(128,128,128)'>",
"<span style='color:rgb(255,0,0)'>",
"<span style='color:rgb(51,255,0)'>",
"<span style='color:rgb(255,255,0)'>",
"<span style='color:rgb(51,102,255)'>",
"<span style='color:rgb(51,255,255)'>",
"<span style='color:rgb(255,51,102)'>",
"<span style='color:rgb(255,255,255)'>",
"<span style='color:rgb(153,153,153)'>",
"<span style='color:rgb(128,128,128)'>"
]
...
def html_colors(qstr='', limit=None):
...
html = _dec_colors.sub(lambda match: _dec_spans[int(match.group(1))], qstr)
html = _hex_colors.sub(hex_repl, html)
...
html = _dec_colors.sub(lambda match: _dec_spans[int(match.group(1))], qstr)
The character following a '^' is treated as an index to the array '_dec_spans'. The corresponding element in '_dec_spans' replaces the character '^' and the following digit in the string 'qstr'.
html = _hex_colors.sub(hex_repl, html)
The output of function 'hex_repl' replaces matching strings in html- '^x' followed by 3 hexadecimal digits. The function 'hex_repl' has more to do with the algorithms of color model conversions than it has to do with regex rules.
The control flow to output similar results to the regex substitutions is in the function
static void b(char * const str);
Unlike the python counterparts, it segments the player name into tokens and prints strings also other strings instead of the sequences not intended to be displayed.
Function Walkthrough
Sorted by caller to callee.
void print_plname(const char *)
const char * parameter is the player's name. It is used as a basis for the variable 'copy'. 'copy' will always be the shorter character string.
This is function is intended to be used by the client file.
This function unconditionally allocates memory (calloc) and frees it at the end.
By itself, it only removes extraneous instances of the character '^'. It then calls the function
static void b(char * const)
where actual output occurs.
static void b(char * const)
const char * parameter is the player's name. The data pointed at by the pointer is altered by function 'strtok', but the pointer itself is never changed. Abstractly, fragments of the player's name are treated as a command to print specific strings.
This function iterates once through the player's name. 'strtok' segments the player's name; sequences between and not including '^'s are treated as substrings. The first character of the substring is checked for a digit inclusively between 0 and 9 for a decimal color code. Exclusively or, checked for an 'x' and a numerical sequence afterwards for a hexidecimal color code. If the substring does not have either, it is printed like an ordinary string.
This function may not be adequate when a player's name intentionally contains '^'.
static void hexspan(const char *)
const char * parameter is ideally a sequence of 3 hexidecimal digits. Actually it is the entire substring from the callee. The first 3 elements are of interest as 3 separate single digit numerical values and are explicitly separated to prevent function 'strtol' from interpreting them as multidigit numbers. These 3 elements are rgb values from the game engine.
Xonotic represents RGB values as a sequence of three digits 0 - 0xF. Before conversion is to be done, they must be multiplied by 0xF so the full range of values for RGB, 0 - 255 can be represented.
This function prints the an html span tag.
This function will first convert rgb to hsl to check if the colors are too dark for the web page, and if so brighten up the colors then reconvert to rgb.
static void decspan(const int)
const int parameter is a digit, the range being [0, 9].
This function is straightforward. It will print an html tag corresponding to the const int parameter.
void hsl2rgb(struct Rgb *, const struct Hls const *)
First parameter, 'struct Rgb *' is the result of the conversion. It does not need to be initialized.
Second parameter, 'const struct Hls const *' is the values and color model to convert from and because, it must be initialized.
The math referenced from:
http://www.rapidtables.com/convert/color/hsl-to-rgb.htm
The implemenation deviates at the last 3 lines of code where the results are finalized and placed in the output. The webpage does not mention that rounding up is necessary. However it is, otherwise the nonzero rgb values for the following colors
Silver (0°,0%,75%)
Gray (0°,0%,50%)
Maroon (0°,100%,25%)
Olive (60°,100%,25%)
Green (120°,100%,25%)
Purple (300°,100%,25%)
Teal (180°,100%,25%)
Navy (240°,100%,25%)
will be off by one.
void rgb2hsl(struct Hls *, const struct Rgb const *)
First parameter, 'struct Hls *' is the result of the conversion. It does not need to be initialized.
Second parameter, 'const struct Rgb const *' is the values and color model to convert from and because, it must be initialized.
The math referenced from:
http://www.rapidtables.com/convert/color/rgb-to-hsl.htm
The implementation deviates when calculating hue, when Cmax is R'. Instead of modulo, there is a summation by 6 when G' is less than B'.

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dbquery.c / dbquery.h
Retrieve information from the database displays it.
Overview
This component uses colors.c / colors.h.
Every function that allocates memory also frees it.
Advanced string manipulation such as concatenation is avoided. Instead strings are printed in parts.
Exo File Dependencies
SQL commands are stored in an outside file (.sql) and executed. The functions in this file are largely adaptable until
void qresult(void * const, const char *);
which prints the results of the query. This is specific to the query. All functions in this file could be considered non-modular because the specialized functions like 'qresult' are eventually called by the more adaptable functions. This may later be solved by calling function pointers to display table data, but currently many of the tables are similar enough that one function to print all tables suffices.
Adding or Removing New Queries
To add new queries the program may handle the following functions need to be adjusted.
inline void print_tblheader(const char *);
inline char *get_filename(const char *) ;
void qresult(void * const, const char *);
The file name of the query file should be added to the switch statement of function 'get_filename'. The starting html tags and labels should also be added to the switch statement of function 'print_tblheader'. For both forementioned functions, the switch statement operates on a variable 'c' which represents the first character of the query string. Currently, the case is that the different queries, '?map=' and '?player=', begin with different letters.
The function 'qresult'- extra formatting and corresponding conditions should be added to the series of if/else-if statements. 'qresult's most applicable conditionals are player names and formatted times- if a new query will involve those, the conditionals should be added.
Function Walkthrough
Sorted by caller to callee.
void getquery(char * const);
Parameter 'char * const' is the query string retrieved from the environment. NULL is an acceptable parameter. Only the first character of the string pointed at by the pointer will be changed.
A file name is then retrieved from 'get_filename', depending on the first character of the query string. Then the contents of the query file is read in to be later to query the database.
Currently, this function determines the size of the file by using 'fseek' and 'ftell'. Often recommended against however:
1. The files to open are restricted to a specific set.
2. The files are plain text files.
3. The file sizes, in bytes, are very unlikely to exceed the maximum value representable by integers.
'ftell' returns a long int. It can determine the file size of a ~2 GB file.
int executequery(const char *, const char *);
Parameter #1 is the string containing the query for the database. NULL is not acceptable. If a null value is given, the program will output the following string to stderr:
Could not prepare SQL statement: not an error
(null)
Parameter #2 is the query string. NULL is acceptable.
This function opens and closes the connection to the database. Also prepares and finalizes the sql statement. However itself, it does not actually query the database.
void qresult(void * const, const char *);
Parameter #1 is the prepared sql statement.
Parameter #2 is the first character of the query string- in use to identify the query.
This function both executes the query and displays the data.
The for loop iterates for each field of the row returned.
Conditionals explained:
The fields are hardcoded from the sql query files.
mranks.sql - (*c = QOVERVIEW)
select mapid, max(trank), min(tvalue), alias
i = 0 1 2 3
rplayers.sql - (*c = QRPLAYER)
select alias, mapid, idrank
i = 0 1 2
mleaderboard.sql - (*c = QMLEADERBOARD)
select trank, alias, tvalue
i = 0 1 2
if ((*c == 'm' && i == 1) || (*c == '\0' && i == 3) || (*c == 'p' && i == 0))
If the field is for map leaderboards and column 1, or the overview and column 3, or player ranks and column 0, then it is a player name; which should have the in-game color codes translated to html.
if ((i == 0 && *c == '\0') || (i == 1 && *c == 'p') )
If the field is for overview and column 0 or is player ranks column 1, then it is a map name, and it should have html tags linking it to the map leaderboards.
if (i == 2 && (*c == 'm' || *c == '\0'))
If the field is column 2 of either the overview or the map leaderboards, then it is a time which should be formatted as such.
If none of the conditionals are met, then the field is printed as usual.
void print_time(const unsigned char *);
Parameter 'const unsigned char *' is the string that represents a number- quantity of centiseconds.
The time as a string is converted to a number by 'strtoul'. Thus, the maximum value that is returned by 'strtoul' given a string is 21,474,836.47 seconds. This is by far, more than enough for a game mode focused on the lowest possible times.
This function performs the conversion and prints the value.
inline void print_tblheader(const char *);
Parameter 'const char *' is a pointer to a string. However, only the first character is of interest because C can not switch on strings.
This function prints the starting tag of the html table.
inline char *get_filename(const char *) ;
Parameter 'const char *' is a pointer to a string. However, only the first character is of interest because C can not switch on strings.
This function returns the file name of a sql query file.