/*
 * XFontName.c
 *
 * build/parse X Font name strings
 */

#include <X11/Xlib.h>
#include <X11/Xos.h>
#include "XFontName.h"
#include <ctype.h>

static char *
extractStringField (char *name, char *buffer, int size,
		    unsigned int *attrp, unsigned int bit)
{
	char	*buf = buffer;

	if (!*name)
		return 0;
	while (*name && *name != '-' && size > 0) {
		*buf++ = *name++;
		--size;
	}
	if (size <= 0)
		return 0;
	*buf = '\0';
	if (buffer[0] != '*' || buffer[1] != '\0')
		*attrp |= bit;
	if (*name == '-')
		return name+1;
	return name;
}

static char *
extractUnsignedField (char *name, unsigned int *result,
		      unsigned int *attrp, unsigned int bit)
{
	char		buf[256];
	char		*c;
	unsigned int	i;

	name = extractStringField (name, buf, sizeof (buf), attrp, bit);
	if (!name)
		return 0;
	if (!(*attrp & bit))
		return name;
	i = 0;
	for (c = buf; *c; c++) {
		if (!isdigit (*c))
			return 0;
		i = i * 10 + (*c - '0');
	}
	*result = i;
	return name;
}

Bool
XParseFontName (XFontNameString fontNameString, XFontName *fontName,
		unsigned int *fontNameAttributes)
{
	char		*name = fontNameString;
	XFontName	temp;
	unsigned int	attributes = 0;

#define GetString(field,bit)\
	if (!(name = extractStringField \
		(name, temp.field, sizeof (temp.field),\
		&attributes, bit))) \
		return False;

#define GetUnsigned(field,bit)\
	if (!(name = extractUnsignedField \
		(name, &temp.field, \
		&attributes, bit))) \
		return False;

	GetString (Registry, FontNameRegistry)
	GetString (Foundry, FontNameFoundry)
	GetString (FamilyName, FontNameFamilyName)
	GetString (WeightName, FontNameWeightName)
	GetString (Slant, FontNameSlant)
	GetString (SetwidthName, FontNameSetwidthName)
	GetString (AddStyleName, FontNameAddStyleName)
	GetUnsigned (PixelSize, FontNamePixelSize)
	GetUnsigned (PointSize, FontNamePointSize)
	GetUnsigned (ResolutionX, FontNameResolutionX)
	GetUnsigned (ResolutionY, FontNameResolutionY)
	GetString (Spacing, FontNameSpacing)
	GetUnsigned (AverageWidth, FontNameAverageWidth)
	GetString (CharSetRegistry, FontNameCharSetRegistry)
	if (!*name) {
		temp.CharSetEncoding[0] = '\0';
		attributes |= FontNameCharSetEncoding;
	} else {
		GetString (CharSetEncoding, FontNameCharSetEncoding)
	}
	*fontName = temp;
	*fontNameAttributes = attributes;
	return True;
}

static char *
utoa (unsigned int u, char *s, int size)
{
	char	*t;

	t = s + size;
	*--t = '\0';
	do
		*--t = (u % 10) + '0';
	while (u /= 10);
	return t;
}

Bool
XFormatFontName (XFontName *fontName, unsigned int fontNameAttributes,
		 XFontNameString fontNameString)
{
	char		tmp[256];
	char		*name = tmp, *f;
	int		left = sizeof (tmp) - 1;
	char		number[32];

#define PutString(field, bit)\
	f = (fontNameAttributes & bit) ? \
		fontName->field \
		: (char *)"*"; \
	if ((left -= strlen (f)) < 0) \
		return False; \
	while (*f) \
		if ((*name++ = *f++) == '-') \
			return False; 
#define PutHyphen()\
	if (--left < 0) \
		return False; \
	*name++ = '-';

#define PutUnsigned(field, bit) \
	f = (fontNameAttributes & bit) ? \
		utoa (fontName->field, number, sizeof (number)) \
		: (char *)"*"; \
	if ((left -= strlen (f)) < 0) \
		return False; \
	while (*f) \
		*name++ = *f++;

	PutString (Registry, FontNameRegistry)
	PutHyphen ();
	PutString (Foundry, FontNameFoundry)
	PutHyphen ();
	PutString (FamilyName, FontNameFamilyName)
	PutHyphen ();
	PutString (WeightName, FontNameWeightName)
	PutHyphen ();
	PutString (Slant, FontNameSlant)
	PutHyphen ();
	PutString (SetwidthName, FontNameSetwidthName)
	PutHyphen ();
	PutString (AddStyleName, FontNameAddStyleName)
	PutHyphen ();
	PutUnsigned (PixelSize, FontNamePixelSize)
	PutHyphen ();
	PutUnsigned (PointSize, FontNamePointSize)
	PutHyphen ();
	PutUnsigned (ResolutionX, FontNameResolutionX)
	PutHyphen ();
	PutUnsigned (ResolutionY, FontNameResolutionY)
	PutHyphen ();
	PutString (Spacing, FontNameSpacing)
	PutHyphen ();
	PutUnsigned (AverageWidth, FontNameAverageWidth)
	PutHyphen ();
	PutString (CharSetRegistry, FontNameCharSetRegistry)
	PutHyphen ();
	PutString (CharSetEncoding, FontNameCharSetEncoding)
	*name = '\0';
	strcpy (fontNameString, tmp);
	return True;
}

Bool
XCompareFontName (XFontName *name1, XFontName *name2,
		  unsigned int fontNameAttributes)
{
#define CompareString(field,bit) \
	if (fontNameAttributes & bit) \
		if (strcmp (name1->field, name2->field)) \
			return False;

#define CompareUnsigned(field,bit) \
	if (fontNameAttributes & bit) \
		if (name1->field != name2->field) \
			return False;

	CompareString (Registry, FontNameRegistry)
	CompareString (Foundry, FontNameFoundry)
	CompareString (FamilyName, FontNameFamilyName)
	CompareString (WeightName, FontNameWeightName)
	CompareString (Slant, FontNameSlant)
	CompareString (SetwidthName, FontNameSetwidthName)
	CompareString (AddStyleName, FontNameAddStyleName)
	CompareUnsigned (PixelSize, FontNamePixelSize)
	CompareUnsigned (PointSize, FontNamePointSize)
	CompareUnsigned (ResolutionX, FontNameResolutionX)
	CompareUnsigned (ResolutionY, FontNameResolutionY)
	CompareString (Spacing, FontNameSpacing)
	CompareUnsigned (AverageWidth, FontNameAverageWidth)
	CompareString (CharSetRegistry, FontNameCharSetRegistry)
	CompareString (CharSetEncoding, FontNameCharSetEncoding)
	return True;
}

Bool
XCopyFontName (XFontName *name1, XFontName *name2,
	       unsigned int fontNameAttributes)
{
#define CopyString(field,bit) \
	if (fontNameAttributes & bit) \
		strcpy (name2->field, name1->field);

#define CopyUnsigned(field,bit) \
	if (fontNameAttributes & bit) \
		name2->field = name1->field;

	CopyString (Registry, FontNameRegistry)
	CopyString (Foundry, FontNameFoundry)
	CopyString (FamilyName, FontNameFamilyName)
	CopyString (WeightName, FontNameWeightName)
	CopyString (Slant, FontNameSlant)
	CopyString (SetwidthName, FontNameSetwidthName)
	CopyString (AddStyleName, FontNameAddStyleName)
	CopyUnsigned (PixelSize, FontNamePixelSize)
	CopyUnsigned (PointSize, FontNamePointSize)
	CopyUnsigned (ResolutionX, FontNameResolutionX)
	CopyUnsigned (ResolutionY, FontNameResolutionY)
	CopyString (Spacing, FontNameSpacing)
	CopyUnsigned (AverageWidth, FontNameAverageWidth)
	CopyString (CharSetRegistry, FontNameCharSetRegistry)
	CopyString (CharSetEncoding, FontNameCharSetEncoding)
	return True;
}