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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/* Purpose: Binary file driver interface , used for code loading */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "erl_driver.h"
#include <errno.h>
#ifdef NO_UMASK
#define FILE_MODE 0644
#else
#define FILE_MODE 0666
#endif
static int this_port;
static long bin_start();
static int bin_init(),bin_stop(),bin_erlang_read();
static int read_fill(), write_fill();
const struct erl_drv_entry bin_driver_entry = {
bin_init,
bin_start,
bin_stop,
bin_erlang_read,
NULL,
NULL,
"binary_filer"
};
static int bin_init()
{
this_port = -1;
return 0;
}
static long bin_start(port,buf)
int port;
char *buf;
{
if (this_port != -1)
return(-1);
this_port = port;
return(port);
}
static int bin_stop()
{
this_port = -1;
}
static int bin_erlang_read(port,buf,count)
long port;
char *buf;
int count;
{
struct stat statbuf;
int i,size,fd,rval;
char *t,*rbuf;
buf[count] = '\0';
switch (*buf) {
case 'c' :
if (chdir(buf+1) == 0) /* sucsess */
driver_output(this_port,"y",1);
else
driver_output(this_port,"n",1);
return 0;
case 'f':
#ifdef MSDOS
if ((fd = open(buf+1,O_RDONLY|O_BINARY)) < 0) {
#else
if ((fd = open(buf+1,O_RDONLY, 0)) < 0) {
#endif
driver_output(this_port,"n",1);
return 0;
}
if (stat(buf+1,&statbuf) < 0) {
driver_output(this_port,"n",1);
close(fd);
return 0;
}
if (S_ISREG(statbuf.st_mode))
size = statbuf.st_size;
else
size = BUFSIZ;
if ((rbuf = (char*) driver_alloc(1 + size)) == NULL) {
fprintf(stderr,"Out of memory\n");
close(fd);
driver_output(this_port,"n",1);
return 0;
}
if (S_ISREG(statbuf.st_mode)) {
if (read_fill(fd,1+rbuf,size) != size) {
driver_free(rbuf);
close(fd);
driver_output(this_port,"n",1);
return 0;;
}
}
/* The idea here is that if it's a regular file read the entire
* entire file and if it's a device file or a tty try to read
* until errno != EINTR
*/
else {
while (1) {
rval = read(fd,1+rbuf,size);
if (rval < 0 && errno == EINTR)
continue;
if (rval < 0) {
driver_free(rbuf);
close(fd);
driver_output(this_port,"n",1);
return 0;
}
size = rval;
break;
}
}
rbuf[0] = 'y';
driver_output(this_port,rbuf,1+size);
driver_free(rbuf);
close(fd);
return 0;
case 'w':
#ifdef MSDOS
if ((fd = open(buf+1, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
FILE_MODE)) < 0) {
#else
if ((fd = open(buf+1, O_WRONLY | O_CREAT | O_TRUNC, FILE_MODE)) < 0) {
#endif
driver_output(this_port,"n",1);
return 0;
}
t = buf+1; i = 1;
while(*t && i++ < count) t++;
t++;
/* t now points to the contents of what we shall write */
size = count - 1 - i;
/* gotta write_fill if we are writing to a slow device
such as /dev/audio */
if (write_fill (fd,t,size) != size) {
driver_output(this_port,"n",1);
close(fd);
return 0;
}
driver_output(this_port,"y",1);
close(fd);
return 0;
default:
driver_failure(this_port,-1);
return 0;
}
}
static int write_fill(fd, buf, len)
char *buf;
{
int i, done = 0;
do {
if ((i = write(fd, buf+done, len-done)) < 0) {
if (errno != EINTR)
return (i);
i = 0;
}
done += i;
} while (done < len);
return (len);
}
static int read_fill(fd, buf, len)
char *buf;
{
int i, got = 0;
do {
if ((i = read(fd, buf+got, len-got)) <= 0) {
if (i == 0 || errno != EINTR)
return (i);
i = 0;
}
got += i;
} while (got < len);
return (len);
}
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