#include <u.h>#include <libc.h>#include <bio.h>#include <disk.h>#include <libsec.h>#include "wrap.h" intwaserrstr(void){	char err[ERRLEN];	int rv; 	err[0] = '\0';	errstr(err);	rv = err[0] != '\0';	errstr(err);	return rv;} char*mkpath(char *a, char *b){	char *p;	int l; 	l = strlen(a)+1+strlen(b)+1;	p = emalloc(l);	snprint(p, l, "%s/%s", a, b);	cleanname(p);	return p;} char*mkpath3(char *a, char *b, char *c){	char *p;	int l; 	l = strlen(a)+1+strlen(b)+1+strlen(c)+1;	p = emalloc(l);	snprint(p, l, "%s/%s/%s", a, b, c);	cleanname(p);	return p;} char*readfile(char *s){	Dir d;	char *p;	int fd, n; 	if(dirstat(s, &d) < 0)		return nil; 	p = emalloc(d.length+1); 	if((fd = open(s, OREAD)) < 0	|| (n = readn(fd, p, d.length)) < 0) {		free(p);		return nil;	} 	p[n] = '\0';	return p;} intstrprefix(char *s, char *pre){	return strncmp(s, pre, strlen(pre));} intmatch(char *s, char **pre, int npre){	int i; 	if(strcmp(s, "/wrap") == 0 || strprefix(s, "/wrap/") == 0 || npre == 0)		return 1; 	for(i=0; i<npre; i++)		if(strprefix(s, pre[i]) == 0)			return 1;	return 0;} intgenopentemp(char *template, int mode, int perm){	int fd, i;	char *p;	 	p = estrdup(template);	fd = -1;	for(i=0; i<10; i++){		mktemp(p);		if(access(p, 0) < 0 && (fd=create(p, mode, perm)) >= 0)			break;		strcpy(p, template);	}	if(fd < 0)		sysfatal("could not create temporary file"); 	strcpy(template, p);	free(p); 	return fd;} intopentemp(char *template){	return genopentemp(template, ORDWR|ORCLOSE, 0400);} intfsort(int fd, char *fn){	Waitmsg w; 	switch(fork()){	case -1:		sysfatal("fork %r");	case 0:		dup(fd, 1);		execl("/bin/sort", "sort", fn, nil);		sysfatal("sort %r");	default:		wait(&w);		if(w.msg[0]) {			errstr(w.msg);			return -1;		}		return 0;	}} vlongfilelength(char *fn){	Dir d; 	if(dirstat(fn, &d) < 0)		return -1; 	return d.length;} void*emalloc(ulong sz){	void *v; 	v = malloc(sz);	if(v == nil)		sysfatal("malloc %lud fails\n", sz);	memset(v, 0, sz);	return v;} void*erealloc(void *v, ulong sz){	v = realloc(v, sz);	if(v == nil)		sysfatal("realloc %lud fails\n", sz);	return v;} char*estrdup(char *s){	s = strdup(s);	if(s == nil)		sysfatal("strdup (%.10s) fails\n", s);	return s;}