111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#include "dynamic-string.h"
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#include <assert.h>
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#include <stdlib.h>
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#include "util.h"
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void
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ds_init(struct ds *ds)
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{
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ds->string = NULL;
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ds->length = 0;
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ds->allocated = 0;
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}
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void
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ds_reserve(struct ds *ds, size_t min_length)
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{
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if (min_length > ds->allocated || !ds->string) {
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ds->allocated += MAX(min_length, ds->allocated);
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ds->allocated = MAX(8, ds->allocated);
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ds->string = xrealloc(ds->string, ds->allocated + 1);
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}
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}
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void
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ds_put_format(struct ds *ds, const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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ds_put_format_valist(ds, format, args);
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va_end(args);
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}
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void
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ds_put_format_valist(struct ds *ds, const char *format, va_list args_)
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{
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va_list args;
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size_t available;
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int needed;
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va_copy(args, args_);
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available = ds->string ? ds->allocated - ds->length + 1 : 0;
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needed = vsnprintf(&ds->string[ds->length], available, format, args);
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va_end(args);
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if (needed < available) {
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ds->length += needed;
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} else {
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size_t available;
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ds_reserve(ds, ds->length + needed);
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va_copy(args, args_);
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available = ds->allocated - ds->length + 1;
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needed = vsnprintf(&ds->string[ds->length], available, format, args);
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va_end(args);
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assert(needed < available);
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ds->length += needed;
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}
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}
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char *
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ds_cstr(struct ds *ds)
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{
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if (!ds->string) {
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ds_reserve(ds, 0);
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ds->string[0] = '\0';
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}
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return ds->string;
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}
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void
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ds_destroy(struct ds *ds)
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{
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free(ds->string);
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}
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