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/*
Simple buffer
Basic buffer manipulation routines. Taken from ELAPI code.
Copyright (C) Dmitri Pal <dpal@redhat.com> 2009 - 2010
This program 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.
This program 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, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include <errno.h> /* for errors */
#include <stdlib.h> /* for free() */
#include <unistd.h> /* for write() */
#include <string.h> /* for memcpy() */
#include "simplebuffer.h"
#include "trace.h"
#include "config.h"
/* End line string */
#define ENDLNSTR "\n"
/* Function to free buffer */
void simplebuffer_free(struct simplebuffer *data)
{
TRACE_FLOW_ENTRY();
if (data) {
free(data->buffer);
free(data);
}
TRACE_FLOW_EXIT();
}
/* Allocate buffer structure */
int simplebuffer_alloc(struct simplebuffer **data)
{
int error = EOK;
TRACE_FLOW_ENTRY();
if (!data) {
TRACE_ERROR_STRING("Invalid argument", "");
error = EINVAL;
}
else {
*data = (struct simplebuffer *)calloc(1,
sizeof(struct simplebuffer));
if (*data == NULL) {
TRACE_ERROR_STRING("Failed to allocate memory", "");
error = ENOMEM;
}
else error = EOK;
}
TRACE_FLOW_RETURN(error);
return error;
}
/* Grow buffer */
int simplebuffer_grow(struct simplebuffer *data,
uint32_t len,
uint32_t block)
{
int error = EOK;
unsigned char *newbuf = NULL;
TRACE_FLOW_ENTRY();
TRACE_INFO_NUMBER("Current length: ", data->length);
TRACE_INFO_NUMBER("Current size: ", data->size);
TRACE_INFO_NUMBER("Length to have: ", len);
TRACE_INFO_NUMBER("Increment length: ", block);
/* Grow buffer if needed */
while (data->length + len >= data->size) {
newbuf = realloc(data->buffer, data->size + block);
if (newbuf == NULL) {
TRACE_ERROR_NUMBER("Error. Failed to allocate memory.", ENOMEM);
return ENOMEM;
}
data->buffer = newbuf;
data->size += block;
TRACE_INFO_NUMBER("New size: ", data->size);
}
TRACE_INFO_NUMBER("Final size: ", data->size);
TRACE_FLOW_RETURN(error);
return error;
}
/* Function to add raw data to the end of the buffer.
* Terminating 0 is not counted in length but appended
* automatically.
*/
int simplebuffer_add_raw(struct simplebuffer *data,
void *data_in,
uint32_t len,
uint32_t block)
{
int error = EOK;
uint32_t size;
TRACE_FLOW_ENTRY();
size = len + 1;
error = simplebuffer_grow(data, size,
((block > size) ? block : size));
if (error) {
TRACE_ERROR_NUMBER("Failed to grow buffer.", error);
return error;
}
memcpy(data->buffer + data->length, data_in, len);
data->length += len;
data->buffer[data->length] = '\0';
TRACE_FLOW_EXIT();
return error;
}
/* Function to add string to the end of the buffer. */
int simplebuffer_add_str(struct simplebuffer *data,
const char *str,
uint32_t len,
uint32_t block)
{
int error = EOK;
uint32_t size;
TRACE_FLOW_ENTRY();
size = len + 1;
error = simplebuffer_grow(data, size,
((block > size) ? block : size));
if (error) {
TRACE_ERROR_NUMBER("Failed to grow buffer.", error);
return error;
}
memcpy(data->buffer + data->length, str, len);
data->length += len;
data->buffer[data->length] = '\0';
TRACE_FLOW_EXIT();
return error;
}
/* Finction to add CR to the buffer */
int simplebuffer_add_cr(struct simplebuffer *data)
{
int error = EOK;
char cr[] = ENDLNSTR;
TRACE_FLOW_ENTRY();
error = simplebuffer_add_raw(data,
(void *)cr,
sizeof(ENDLNSTR) - 1,
sizeof(ENDLNSTR));
TRACE_FLOW_RETURN(error);
return error;
}
/* Function to write data synchroniusly */
int simplebuffer_write(int fd, struct simplebuffer *data, uint32_t *left)
{
size_t res;
int error;
TRACE_FLOW_ENTRY();
/* Write given number of bytes to the socket */
res = write(fd,
data->buffer + (data->length - *left),
(size_t)(*left));
if (res == -1) {
error = errno;
TRACE_ERROR_NUMBER("Write failed.", error);
return error;
}
(*left) -= res;
TRACE_FLOW_EXIT();
return EOK;
}
/* Get buffer */
const unsigned char *simplebuffer_get_buf(struct simplebuffer *data)
{
return data->buffer;
}
/* Get length */
uint32_t simplebuffer_get_len(struct simplebuffer *data)
{
return data->length;
}
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