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/*
* concat_buf functions
* appending formatted output to dynamically grown strings
*
* Copyright (C) 2011 Alexander Nezhinsky <alexandernf@mellanox.com>
*
* 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, version 2 of the
* License.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <inttypes.h>
#include <unistd.h>
#include <stdio.h>
#include "log.h"
#include "util.h"
void concat_buf_init(struct concat_buf *b)
{
b->streamf = open_memstream(&b->buf, &b->size);
b->err = b->streamf ? 0 : errno;
b->used = 0;
}
int concat_printf(struct concat_buf *b, const char *format, ...)
{
va_list args;
int nprinted;
if (!b->err) {
va_start(args, format);
nprinted = vfprintf(b->streamf, format, args);
if (nprinted >= 0)
b->used += nprinted;
else {
b->err = nprinted;
fclose(b->streamf);
b->streamf = NULL;
}
va_end(args);
}
return b->err;
}
const char *concat_delim(struct concat_buf *b, const char *delim)
{
return !b->used ? "" : delim;
}
int concat_buf_finish(struct concat_buf *b)
{
if (b->streamf) {
fclose(b->streamf);
b->streamf = NULL;
if (b->size)
b->size++; /* account for trailing NULL char */
}
return b->err;
}
int concat_write(struct concat_buf *b, int fd, int offset)
{
concat_buf_finish(b);
if (b->err) {
errno = b->err;
return -1;
}
if (b->size - offset > 0)
return write(fd, b->buf + offset, b->size - offset);
else {
errno = EINVAL;
return -1;
}
}
void concat_buf_release(struct concat_buf *b)
{
concat_buf_finish(b);
if (b->buf) {
free(b->buf);
memset(b, 0, sizeof(*b));
}
}
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