Differential D10335 Diff 52326 contrib/lib9p/sbuf/sbuf.c

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contrib/lib9p/sbuf/sbuf.c

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				/*
				* Copyright 2016 Jakub Klama <jceel@FreeBSD.org>
				* All rights reserved
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted providing that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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 CONTRACT,
				* 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.
				*
				*/

				/*
				* Minimal libsbuf reimplementation for Mac OS X.
				*/

				#include <stdlib.h>
				#include <unistd.h>
				#include <string.h>
				#include <stdarg.h>
				#include <stdio.h>
				#include "sbuf.h"

				#define SBUF_INITIAL_SIZE 128

				struct sbuf *
				sbuf_new_auto()
				{
				struct sbuf *s;

				s = malloc(sizeof(struct sbuf));
				s->s_buf = calloc(1, SBUF_INITIAL_SIZE + 1);
				s->s_capacity = s->s_buf != NULL ? SBUF_INITIAL_SIZE : 0;
				s->s_size = 0;

				return (s);
				}

				int
				sbuf_cat(struct sbuf s, const char str)
				{
				int req = (int)strlen(str);

				if (s->s_size + req >= s->s_capacity) {
				s->s_capacity = s->s_size + req + 1;
				s->s_buf = realloc(s->s_buf, (size_t)s->s_capacity);
				}
				if (s->s_buf == NULL)
				return (-1);

				strcpy(s->s_buf + s->s_size, str);
				s->s_size += req;

				return (0);
				}

				int
				sbuf_printf(struct sbuf s, const char fmt, ...)
				{
				int ret;
				va_list ap;

				va_start(ap, fmt);
				ret = sbuf_vprintf(s, fmt, ap);
				va_end(ap);

				return (ret);
				}

				int
				sbuf_vprintf(struct sbuf s, const char fmt, va_list args)
				{
				va_list copy;
				int req;

				va_copy(copy, args);
				req = vsnprintf(NULL, 0, fmt, copy);
				va_end(copy);

				if (s->s_size + req >= s->s_capacity) {
				s->s_capacity = s->s_size + req + 1;
				s->s_buf = realloc(s->s_buf, (size_t)s->s_capacity);
				}
				if (s->s_buf == NULL)
				return (-1);

				req = vsnprintf(s->s_buf + s->s_size, req + 1, fmt, args);
				s->s_size += req;

				return (0);
				}

				char *
				sbuf_data(struct sbuf *s)
				{
				return (s->s_buf);
				}

				int
				sbuf_finish(struct sbuf *s)
				{
				if (s->s_buf != NULL)
				s->s_buf[s->s_size] = '\0';
				return (0);
				}

				void
				sbuf_delete(struct sbuf *s)
				{
				free(s->s_buf);
				free(s);
				}