/*
* rwarray.c - Builtin functions to binary read / write arrays to a file.
*
* Arnold Robbins
* May 2009
* Redone June 2012
*/
/*
* Copyright (C) 2009, 2010, 2011, 2012, 2013 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "gawkapi.h"
#include "gettext.h"
#define _(msgid) gettext(msgid)
#define N_(msgid) msgid
#define MAGIC "awkrulz\n"
#define MAJOR 3
#define MINOR 0
static const gawk_api_t *api; /* for convenience macros to work */
static awk_ext_id_t ext_id;
static const char *ext_version = "rwarray0 extension: version 1.0";
static awk_bool_t (*init_func)(void) = NULL;
int plugin_is_GPL_compatible;
static awk_bool_t write_array(int fd, awk_array_t array);
static awk_bool_t write_elem(int fd, awk_element_t *element);
static awk_bool_t write_value(int fd, awk_value_t *val);
static awk_bool_t read_array(int fd, awk_array_t array);
static awk_bool_t read_elem(int fd, awk_element_t *element);
static awk_bool_t read_value(int fd, awk_value_t *value);
/*
* Format of array info:
*
* MAGIC 8 bytes
* Major version 4 bytes - network order
* Minor version 4 bytes - network order
* Element count 4 bytes - network order
* Elements
*
* For each element:
* Length of index val: 4 bytes - network order
* Index val as characters (N bytes)
* Value type 4 bytes (0 = string, 1 = number, 2 = array)
* IF string:
* Length of value 4 bytes
* Value as characters (N bytes)
* ELSE IF number:
* 8 bytes as native double
* ELSE
* Element count
* Elements
* END IF
*/
/* do_writea --- write an array */
static awk_value_t *
do_writea(int nargs, awk_value_t *result, struct awk_ext_func *unused)
{
awk_value_t filename, array;
int fd = -1;
uint32_t major = MAJOR;
uint32_t minor = MINOR;
assert(result != NULL);
make_number(0.0, result);
if (nargs < 2)
goto out;
/* directory is first arg, array to dump is second */
if (! get_argument(0, AWK_STRING, & filename)) {
fprintf(stderr, _("do_writea: argument 0 is not a string\n"));
errno = EINVAL;
goto done1;
}
if (! get_argument(1, AWK_ARRAY, & array)) {
fprintf(stderr, _("do_writea: argument 1 is not an array\n"));
errno = EINVAL;
goto done1;
}
/* open the file, if error, set ERRNO and return */
fd = creat(filename.str_value.str, 0600);
if (fd < 0)
goto done1;
if (write(fd, MAGIC, strlen(MAGIC)) != strlen(MAGIC))
goto done1;
major = htonl(major);
if (write(fd, & major, sizeof(major)) != sizeof(major))
goto done1;
minor = htonl(minor);
if (write(fd, & minor, sizeof(minor)) != sizeof(minor))
goto done1;
if (write_array(fd, array.array_cookie)) {
make_number(1.0, result);
goto done0;
}
done1:
update_ERRNO_int(errno);
unlink(filename.str_value.str);
done0:
close(fd);
out:
return result;
}
/* write_array --- write out an array or a sub-array */
static awk_bool_t
write_array(int fd, awk_array_t array)
{
uint32_t i;
uint32_t count;
awk_flat_array_t *flat_array;
if (! flatten_array(array, & flat_array)) {
fprintf(stderr, _("write_array: could not flatten array\n"));
return awk_false;
}
count = htonl(flat_array->count);
if (write(fd, & count, sizeof(count)) != sizeof(count))
return awk_false;
for (i = 0; i < flat_array->count; i++) {
if (! write_elem(fd, & flat_array->elements[i]))
return awk_false;
}
if (! release_flattened_array(array, flat_array)) {
fprintf(stderr, _("write_array: could not release flattened array\n"));
return awk_false;
}
return awk_true;
}
/* write_elem --- write out a single element */
static awk_bool_t
write_elem(int fd, awk_element_t *element)
{
uint32_t indexval_len;
ssize_t write_count;
indexval_len = htonl(element->index.str_value.len);
if (write(fd, & indexval_len, sizeof(indexval_len)) != sizeof(indexval_len))
return awk_false;
if (element->index.str_value.len > 0) {
write_count = write(fd, element->index.str_value.str,
element->index.str_value.len);
if (write_count != (ssize_t) element->index.str_value.len)
return awk_false;
}
return write_value(fd, & element->value);
}
/* write_value --- write a number or a string or a array */
static awk_bool_t
write_value(int fd, awk_value_t *val)
{
uint32_t code, len;
if (val->val_type == AWK_ARRAY) {
code = htonl(2);
if (write(fd, & code, sizeof(code)) != sizeof(code))
return awk_false;
return write_array(fd, val->array_cookie);
}
if (val->val_type == AWK_NUMBER) {
code = htonl(1);
if (write(fd, & code, sizeof(code)) != sizeof(code))
return awk_false;
if (write(fd, & val->num_value, sizeof(val->num_value)) != sizeof(val->num_value))
return awk_false;
} else {
code = 0;
if (write(fd, & code, sizeof(code)) != sizeof(code))
return awk_false;
len = htonl(val->str_value.len);
if (write(fd, & len, sizeof(len)) != sizeof(len))
return awk_false;
if (write(fd, val->str_value.str, val->str_value.len)
!= (ssize_t) val->str_value.len)
return awk_false;
}
return awk_true;
}
/* do_reada --- read an array */
static awk_value_t *
do_reada(int nargs, awk_value_t *result, struct awk_ext_func *unused)
{
awk_value_t filename, array;
int fd = -1;
uint32_t major;
uint32_t minor;
char magic_buf[30];
assert(result != NULL);
make_number(0.0, result);
if (nargs < 2)
goto out;
/* directory is first arg, array to read is second */
if (! get_argument(0, AWK_STRING, & filename)) {
fprintf(stderr, _("do_reada: argument 0 is not a string\n"));
errno = EINVAL;
goto done1;
}
if (! get_argument(1, AWK_ARRAY, & array)) {
fprintf(stderr, _("do_reada: argument 1 is not an array\n"));
errno = EINVAL;
goto done1;
}
fd = open(filename.str_value.str, O_RDONLY);
if (fd < 0)
goto done1;
memset(magic_buf, '\0', sizeof(magic_buf));
if (read(fd, magic_buf, strlen(MAGIC)) != strlen(MAGIC)) {
errno = EBADF;
goto done1;
}
if (strcmp(magic_buf, MAGIC) != 0) {
errno = EBADF;
goto done1;
}
if (read(fd, & major, sizeof(major)) != sizeof(major)) {
errno = EBADF;
goto done1;
}
major = ntohl(major);
if (major != MAJOR) {
errno = EBADF;
goto done1;
}
if (read(fd, & minor, sizeof(minor)) != sizeof(minor)) {
/* read() sets errno */
goto done1;
}
minor = ntohl(minor);
if (minor != MINOR) {
errno = EBADF;
goto done1;
}
if (! clear_array(array.array_cookie)) {
errno = ENOMEM;
fprintf(stderr, _("do_reada: clear_array failed\n"));
goto done1;
}
if (read_array(fd, array.array_cookie)) {
make_number(1.0, result);
goto done0;
}
done1:
update_ERRNO_int(errno);
done0:
close(fd);
out:
return result;
}
/* read_array --- read in an array or sub-array */
static awk_bool_t
read_array(int fd, awk_array_t array)
{
uint32_t i;
uint32_t count;
awk_element_t new_elem;
if (read(fd, & count, sizeof(count)) != sizeof(count)) {
return awk_false;
}
count = ntohl(count);
for (i = 0; i < count; i++) {
if (read_elem(fd, & new_elem)) {
/* add to array */
if (! set_array_element_by_elem(array, & new_elem)) {
fprintf(stderr, _("read_array: set_array_element failed\n"));
return awk_false;
}
} else
break;
}
if (i != count)
return awk_false;
return awk_true;
}
/* read_elem --- read in a single element */
static awk_bool_t
read_elem(int fd, awk_element_t *element)
{
uint32_t index_len;
static char *buffer;
static uint32_t buflen;
ssize_t ret;
if ((ret = read(fd, & index_len, sizeof(index_len))) != sizeof(index_len)) {
return awk_false;
}
index_len = ntohl(index_len);
memset(element, 0, sizeof(*element));
if (index_len > 0) {
if (buffer == NULL) {
// allocate buffer
emalloc(buffer, char *, index_len, "read_elem");
buflen = index_len;
} else if (buflen < index_len) {
// reallocate buffer
char *cp = realloc(buffer, index_len);
if (cp == NULL)
return awk_false;
buffer = cp;
buflen = index_len;
}
if (read(fd, buffer, index_len) != (ssize_t) index_len) {
return awk_false;
}
make_const_string(buffer, index_len, & element->index);
} else {
make_null_string(& element->index);
}
if (! read_value(fd, & element->value))
return awk_false;
return awk_true;
}
/* read_value --- read a number or a string */
static awk_bool_t
read_value(int fd, awk_value_t *value)
{
uint32_t code, len;
if (read(fd, & code, sizeof(code)) != sizeof(code))
return awk_false;
code = ntohl(code);
if (code == 2) {
awk_array_t array = create_array();
if (read_array(fd, array) != 0)
return awk_false;
/* hook into value */
value->val_type = AWK_ARRAY;
value->array_cookie = array;
} else if (code == 1) {
double d;
if (read(fd, & d, sizeof(d)) != sizeof(d))
return awk_false;
/* hook into value */
value->val_type = AWK_NUMBER;
value->num_value = d;
} else {
if (read(fd, & len, sizeof(len)) != sizeof(len)) {
return awk_false;
}
len = ntohl(len);
value->val_type = AWK_STRING;
value->str_value.len = len;
value->str_value.str = malloc(len + 1);
if (read(fd, value->str_value.str, len) != (ssize_t) len) {
free(value->str_value.str);
return awk_false;
}
value->str_value.str[len] = '\0';
}
return awk_true;
}
static awk_ext_func_t func_table[] = {
{ "writea", do_writea, 2, 2, awk_false, NULL },
{ "reada", do_reada, 2, 2, awk_false, NULL },
};
/* define the dl_load function using the boilerplate macro */
dl_load_func(func_table, rwarray, "")