#include <u.h>#include <libc.h>#include <bio.h>#include <thread.h>#include <ctype.h>#include <plumb.h>#include "dat.h"  char*formathtml(char *body, int *np){	int i, j, p[2], q[2];	Exec *e;	char buf[1024];	Channel *sync; 	e = emalloc(sizeof(struct Exec));	if(pipe(p) < 0 || pipe(q) < 0)		error("can't create pipe: %r"); 	e->p[0] = p[0];	e->p[1] = p[1];	e->q[0] = q[0];	e->q[1] = q[1];	e->argv = emalloc(3*sizeof(char*));	e->argv[0] = estrdup("htmlfmt");	e->argv[1] = estrdup("-cutf-8");	e->argv[2] = nil;	e->prog = "/bin/htmlfmt";	sync = chancreate(sizeof(int), 0);	e->sync = sync;	proccreate(execproc, e, EXECSTACK);	recvul(sync);	close(p[0]);	close(q[1]); 	if((i=write(p[1], body, *np)) != *np){		fprint(2, "Mail: warning: htmlfmt failed: wrote %d of %d: %r\n", i, *np);		close(p[1]);		close(q[0]);		return body;	}	close(p[1]); 	free(body);	body = nil;	i = 0;	for(;;){		j = read(q[0], buf, sizeof buf);		if(j <= 0)			break;		body = realloc(body, i+j+1);		if(body == nil)			error("realloc failed: %r");		memmove(body+i, buf, j);		i += j;		body[i] = '\0';	}	close(q[0]); 	*np = i;	return body;} char*readbody(char *type, char *dir, int *np){	char *body;		body = readfile(dir, "body", np);	if(body != nil && strcmp(type, "text/html") == 0)		return formathtml(body, np);	return body;}