static int databuf_shift_data_to_beginning(DataBuf *db)
{
DATABUF_VALIDATE(db);
if (db->flags & DATABUF_FLAG_PRESERVE_HEAD) return -1;
if (databuf_beg(db) == NULL) return 1;
if (db->offset) {
memmove(db->alloc_ptr, databuf_beg(db), db->len);
db->offset = 0;
}
DATABUF_VALIDATE(db);
return 1;
}
void databuf_print(DataBuf *db, int print_data, char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (fmt) {
vprintf(fmt, ap);
}
printf("%salloc_size=%zu alloc_ptr=%p offset=%zu beg=%p len=%zu max_len=%zu flags=[",
fmt?" ":"", db->alloc_size, db->alloc_ptr, db->offset, databuf_beg(db), db->len, db->max_len);
if (db->flags & DATABUF_FLAG_PRESERVE_HEAD) printf("PRESERVE_HEAD ");
if (db->flags & DATABUF_FLAG_STRING) printf("STRING ");
printf("]");
if (print_data) {
printf(" [");
fwrite(databuf_beg(db), 1, db->len, stdout);
printf("]");
}
printf("\n");
}
static int readline_buf(auparse_state_t *au)
{
char *p_newline=NULL;
size_t line_len;
if (au->cur_buf != NULL) {
free(au->cur_buf);
au->cur_buf = NULL;
}
//if (debug) databuf_print(&au->databuf, 1, "readline_buf");
if (au->databuf.len == 0) {
// return EOF condition
errno = 0;
return -2;
}
if ((p_newline = strnchr(databuf_beg(&au->databuf), '\n',
au->databuf.len)) != NULL) {
line_len = p_newline - databuf_beg(&au->databuf);
/* dup the line */
au->cur_buf = malloc(line_len+1); // +1 for null terminator
if (au->cur_buf == NULL)
return -1; // return error condition, errno set
strncpy(au->cur_buf, databuf_beg(&au->databuf), line_len);
au->cur_buf[line_len] = 0;
if (databuf_advance(&au->databuf, line_len+1) < 0)
return -1;
// return success
errno = 0;
return 1;
} else {
// return no data available
errno = 0;
return 0;
}
}
int databuf_compress(DataBuf *db)
{
void *new_alloc;
DATABUF_VALIDATE(db);
if (databuf_beg(db) == NULL || db->len == 0) return 0;
databuf_shift_data_to_beginning(db);
if ((new_alloc = realloc(db->alloc_ptr, db->len))) {
db->alloc_ptr = new_alloc;
db->alloc_size = db->len;
} else {
return -1; /* realloc failed */
}
DATABUF_VALIDATE(db);
return 1;
}
