141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/**
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* @file bstring.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef BADVPN_BSTRING_H
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#define BADVPN_BSTRING_H
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#include <misc/debug.h>
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#include <stdlib.h>
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#include <string.h>
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#define BSTRING_TYPE_STATIC 5
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#define BSTRING_TYPE_DYNAMIC 7
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#define BSTRING_TYPE_EXTERNAL 11
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#define BSTRING_STATIC_SIZE 23
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#define BSTRING_STATIC_MAX (BSTRING_STATIC_SIZE - 1)
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typedef struct {
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union {
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struct {
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char type;
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char static_string[BSTRING_STATIC_SIZE];
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} us;
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struct {
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char type;
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char *dynamic_string;
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} ud;
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struct {
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char type;
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const char *external_string;
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} ue;
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} u;
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} BString;
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static void BString__assert (BString *o)
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{
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switch (o->u.us.type) {
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case BSTRING_TYPE_STATIC:
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case BSTRING_TYPE_DYNAMIC:
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case BSTRING_TYPE_EXTERNAL:
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return;
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}
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ASSERT(0);
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}
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static int BString_Init (BString *o, const char *str)
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{
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if (strlen(str) <= BSTRING_STATIC_MAX) {
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strcpy(o->u.us.static_string, str);
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o->u.us.type = BSTRING_TYPE_STATIC;
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} else {
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if (!(o->u.ud.dynamic_string = malloc(strlen(str) + 1))) {
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return 0;
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}
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strcpy(o->u.ud.dynamic_string, str);
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o->u.ud.type = BSTRING_TYPE_DYNAMIC;
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}
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BString__assert(o);
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return 1;
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}
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static void BString_InitStatic (BString *o, const char *str)
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{
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ASSERT(strlen(str) <= BSTRING_STATIC_MAX)
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strcpy(o->u.us.static_string, str);
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o->u.us.type = BSTRING_TYPE_STATIC;
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BString__assert(o);
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}
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static void BString_InitExternal (BString *o, const char *str)
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{
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o->u.ue.external_string = str;
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o->u.ue.type = BSTRING_TYPE_EXTERNAL;
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BString__assert(o);
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}
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static void BString_InitAllocated (BString *o, char *str)
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{
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o->u.ud.dynamic_string = str;
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o->u.ud.type = BSTRING_TYPE_DYNAMIC;
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BString__assert(o);
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}
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static void BString_Free (BString *o)
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{
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BString__assert(o);
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if (o->u.ud.type == BSTRING_TYPE_DYNAMIC) {
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free(o->u.ud.dynamic_string);
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}
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}
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static const char * BString_Get (BString *o)
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{
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BString__assert(o);
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switch (o->u.us.type) {
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case BSTRING_TYPE_STATIC: return o->u.us.static_string;
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case BSTRING_TYPE_DYNAMIC: return o->u.ud.dynamic_string;
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case BSTRING_TYPE_EXTERNAL: return o->u.ue.external_string;
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}
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ASSERT(0);
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return NULL;
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}
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#endif
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