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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <thread.h>
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#include "dat.h"
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void*
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emalloc(uint n)
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{
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	void *p;
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	p = malloc(n);
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	if(p == nil)
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		error("can't malloc: %r");
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	memset(p, 0, n);
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	return p;
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}
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char*
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estrdup(char *s)
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{
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	char *t;
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	t = emalloc(strlen(s)+1);
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	strcpy(t, s);
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	return t;
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}
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char*
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estrstrdup(char *s, char *t)
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{
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	char *u;
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	u = emalloc(strlen(s)+strlen(t)+1);
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	sprint(u, "%s%s", s, t);
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	return u;
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}
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char*
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eappend(char *s, char *sep, char *t)
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{
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	char *u;
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	if(t == nil)
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		u = estrstrdup(s, sep);
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	else{
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		u = emalloc(strlen(s)+strlen(sep)+strlen(t)+1);
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		sprint(u, "%s%s%s", s, sep, t);
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	}
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	free(s);
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	return u;
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}
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char*
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egrow(char *s, char *sep, char *t)
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{
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	s = eappend(s, sep, t);
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	free(t);
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	return s;
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}
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void
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error(char *fmt, ...)
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{
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	Fmt f;
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	char buf[64];
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	va_list arg;
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	fmtfdinit(&f, 2, buf, sizeof buf);
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	fmtprint(&f, "win: ");
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	va_start(arg, fmt);
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	fmtvprint(&f, fmt, arg);
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	va_end(arg);
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	fmtprint(&f, "\n");
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	fmtfdflush(&f);
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	threadexitsall(fmt);
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}
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void
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ctlprint(int fd, char *fmt, ...)
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{
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	int n;
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	va_list arg;
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	va_start(arg, fmt);
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	n = vfprint(fd, fmt, arg);
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	va_end(arg);
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	if(n <= 0)
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		error("control file write error: %r");
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}