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+ /*
+ ** OSSP cfg - Configuration Parsing
+ ** Copyright (c) 1999-2002 Ralf S. Engelschall <rse@engelschall.com>
+ ** Copyright (c) 1999-2002 The OSSP Project (http://www.ossp.org/)
+ ** Copyright (c) 2001-2002 Cable & Wireless Deutschland (http://www.cw.com/de/)
+ **
+ ** This file is part of OSSP cfg, a configuration parsing
+ ** library which can be found at http://www.ossp.org/pkg/lib/cfg/.
+ **
+ ** Permission to use, copy, modify, and distribute this software for
+ ** any purpose with or without fee is hereby granted, provided that
+ ** the above copyright notice and this permission notice appear in all
+ ** copies.
+ **
+ ** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ ** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ ** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ ** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
+ ** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ ** USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRCFG, STRICT LIABILITY,
+ ** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ ** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ ** SUCH DAMAGE.
+ **
+ ** cfg_buf.c: auto-resizing buffer
+ */
+
+ #include <stdlib.h>
+ #include <stdarg.h>
+ #include <string.h>
+
+ #include "cfg.h"
+ #include "cfg_buf.h"
+ #include "cfg_fmt.h"
+
+ cfg_rc_t cfg_buf_create(cfg_buf_t **buf)
+ {
+ if (buf == NULL)
+ return CFG_ERR_ARG;
+ if ((*buf = (cfg_buf_t *)malloc(sizeof(cfg_buf_t))) == NULL)
+ return CFG_ERR_SYS;
+ (*buf)->buf_ptr = NULL;
+ (*buf)->buf_len = 0;
+ (*buf)->buf_size = 0;
+ return CFG_OK;
+ }
+
+ cfg_rc_t cfg_buf_resize(cfg_buf_t *buf, int n)
+ {
+ char *cp;
+
+ if (buf == NULL)
+ return CFG_ERR_ARG;
+ if (n == 0) {
+ /* destroy buffer */
+ if (buf->buf_ptr != NULL)
+ free(buf->buf_ptr);
+ buf->buf_ptr = NULL;
+ buf->buf_len = 0;
+ buf->buf_size = 0;
+ }
+ else {
+ /* shrink or grow buffer */
+ if (buf->buf_ptr == NULL) {
+ if ((buf->buf_ptr = malloc(n)) == NULL)
+ return CFG_ERR_SYS;
+ buf->buf_size = n;
+ buf->buf_len = 0;
+ }
+ else {
+ if ((cp = realloc(buf->buf_ptr, buf->buf_size+n)) == NULL)
+ return CFG_ERR_SYS;
+ buf->buf_ptr = cp;
+ buf->buf_size += n;
+ if (buf->buf_len > buf->buf_size) {
+ buf->buf_len = buf->buf_size;
+ *(buf->buf_ptr + buf->buf_len - 1) = '\0';
+ }
+ }
+ }
+ return CFG_OK;
+ }
+
+ cfg_rc_t cfg_buf_format(cfg_buf_t *buf, const char *fmt, ...)
+ {
+ cfg_rc_t rc;
+ va_list ap;
+ int n;
+
+ va_start(ap, fmt);
+ if (buf == NULL || fmt == NULL)
+ return CFG_ERR_ARG;
+ if ((n = cfg_fmt_vsprintf(NULL, -1, fmt, ap)) == -1)
+ return CFG_ERR_FMT;
+ if ((rc = cfg_buf_resize(buf, n+1)) != CFG_OK)
+ return rc;
+ if ((n = cfg_fmt_vsprintf(buf->buf_ptr + buf->buf_len,
+ buf->buf_size - buf->buf_len,
+ fmt, ap)) == -1)
+ return CFG_ERR_FMT;
+ buf->buf_len += n;
+ va_end(ap);
+ return CFG_OK;
+ }
+
+ cfg_rc_t cfg_buf_content(cfg_buf_t *buf, char **ptr, size_t *len, size_t *size)
+ {
+ if (buf == NULL)
+ return CFG_ERR_ARG;
+ if (ptr != NULL)
+ *ptr = buf->buf_ptr;
+ if (len != NULL)
+ *len = buf->buf_len;
+ if (size != NULL)
+ *size = buf->buf_size;
+ return CFG_OK;
+ }
+
+ cfg_rc_t cfg_buf_destroy(cfg_buf_t *buf)
+ {
+ if (buf == NULL)
+ return CFG_ERR_ARG;
+ if (buf->buf_ptr != NULL)
+ free(buf->buf_ptr);
+ free(buf);
+ return CFG_OK;
+ }
+
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