#include <u.h>#include <libc.h>#include <draw.h> static char*skip(char *s){	while(*s==' ' || *s=='\n' || *s=='\t')		s++;	return s;} Font*buildfont(Display *d, char *buf, char *name){	Font *fnt;	Cachefont *c;	char *s, *t;	ulong min, max;	int offset;	char badform[] = "bad font format: number expected (char position %d)"; 	s = buf;	fnt = malloc(sizeof(Font));	if(fnt == 0)		return 0;	memset(fnt, 0, sizeof(Font));	fnt->display = d;	fnt->name = strdup(name);	fnt->ncache = NFCACHE+NFLOOK;	fnt->nsubf = NFSUBF;	fnt->cache = malloc(fnt->ncache * sizeof(fnt->cache[0]));	fnt->subf = malloc(fnt->nsubf * sizeof(fnt->subf[0]));	if(fnt->name==0 || fnt->cache==0 || fnt->subf==0){    Err2:		free(fnt->name);		free(fnt->cache);		free(fnt->subf);		free(fnt->sub);		free(fnt);		return 0;	}	fnt->height = strtol(s, &s, 0);	s = skip(s);	fnt->ascent = strtol(s, &s, 0);	s = skip(s);	if(fnt->height<=0 || fnt->ascent<=0){		werrstr("bad height or ascent in font file");		goto Err2;	}	fnt->width = 0;	fnt->nsub = 0;	fnt->sub = 0; 	memset(fnt->subf, 0, fnt->nsubf * sizeof(fnt->subf[0]));	memset(fnt->cache, 0, fnt->ncache*sizeof(fnt->cache[0]));	fnt->age = 1;	do{		/* must be looking at a number now */		if(*s<'0' || '9'<*s){			werrstr(badform, s-buf);			goto Err3;		}		min = strtol(s, &s, 0);		s = skip(s);		/* must be looking at a number now */		if(*s<'0' || '9'<*s){			werrstr(badform, s-buf);			goto Err3;		}		max = strtol(s, &s, 0);		s = skip(s);		if(*s==0 || min>Runemax || max>Runemax || min>max){			werrstr("illegal subfont range");    Err3:			freefont(fnt);			return 0;		}		t = s;		offset = strtol(s, &t, 0);		if(t>s && (*t==' ' || *t=='\t' || *t=='\n'))			s = skip(t);		else			offset = 0;		fnt->sub = realloc(fnt->sub, (fnt->nsub+1)*sizeof(Cachefont*));		if(fnt->sub == 0){			/* realloc manual says fnt->sub may have been destroyed */			fnt->nsub = 0;			goto Err3;		}		c = malloc(sizeof(Cachefont));		if(c == 0)			goto Err3;		fnt->sub[fnt->nsub] = c;		c->min = min;		c->max = max;		c->offset = offset;		t = s;		while(*s && *s!=' ' && *s!='\n' && *s!='\t')			s++;		*s++ = 0;		c->subfontname = 0;		c->name = strdup(t);		if(c->name == 0){			free(c);			goto Err3;		}		s = skip(s);		fnt->nsub++;	}while(*s);	return fnt;} voidfreefont(Font *f){	int i;	Cachefont *c;	Subfont *s; 	if(f == 0)		return; 	for(i=0; i<f->nsub; i++){		c = f->sub[i];		free(c->subfontname);		free(c->name);		free(c);	}	for(i=0; i<f->nsubf; i++){		s = f->subf[i].f;		if(s && display && s!=display->defaultsubfont)			freesubfont(s);	}	freeimage(f->cacheimage);	free(f->name);	free(f->cache);	free(f->subf);	free(f->sub);	free(f);}