void*

#include <u.h>
#include <libc.h>
#include <bio.h>
#include <draw.h>
#include <html.h>
#include "dat.h"

void*
emalloc(ulong n)
{
void *p;

p = malloc(n);
if(p == nil)
error("can't malloc: %r");
memset(p, 0, n);
return p;
}

void*
erealloc(void *p, ulong n)
{
p = realloc(p, n);
if(p == nil)
error("can't malloc: %r");
return p;
}

char*
estrdup(char *s)
{
char *t;

t = emalloc(strlen(s)+1);
strcpy(t, s);
return t;
}

char*
estrstrdup(char *s, char *t)
{
long ns, nt;
char *u;

ns = strlen(s);
nt = strlen(t);
/* use malloc to avoid memset */
u = malloc(ns+nt+1);
if(u == nil)
error("can't malloc: %r");
memmove(u, s, ns);
memmove(u+ns, t, nt);
u[ns+nt] = '\0';
return u;
}

char*
eappend(char *s, char *sep, char *t)
{
long ns, nsep, nt;
char *u;

if(t == nil)
u = estrstrdup(s, sep);
else{
ns = strlen(s);
nsep = strlen(sep);
nt = strlen(t);
/* use malloc to avoid memset */
u = malloc(ns+nsep+nt+1);
if(u == nil)
error("can't malloc: %r");
memmove(u, s, ns);
memmove(u+ns, sep, nsep);
memmove(u+ns+nsep, t, nt);
u[ns+nsep+nt] = '\0';
}
free(s);
return u;
}

char*
egrow(char *s, char *sep, char *t)
{
s = eappend(s, sep, t);
free(t);
return s;
}

void
error(char *fmt, ...)
{
va_list arg;
char buf[256];
Fmt f;

fmtfdinit(&f, 2, buf, sizeof buf);
fmtprint(&f, "Mail: ");
va_start(arg, fmt);
fmtvprint(&f, fmt, arg);
va_end(arg);
fmtprint(&f, "\n");
fmtfdflush(&f);
exits(fmt);
}

void
growbytes(Bytes *b, char *s, long ns)
{
if(b->nalloc < b->n + ns + 1){
b->nalloc = b->n + ns + 8000;
/* use realloc to avoid memset */
b->b = realloc(b->b, b->nalloc);
if(b->b == nil)
error("growbytes: can't realloc: %r");
}
memmove(b->b+b->n, s, ns);
b->n += ns;
b->b[b->n] = '\0';
}