/crypto/heimdal/lib/roken/strpool.c

  1/*
  2 * Copyright (c) 2005 Kungliga Tekniska Hรถgskolan
  3 * (Royal Institute of Technology, Stockholm, Sweden).
  4 * All rights reserved.
  5 *
  6 * Redistribution and use in source and binary forms, with or without
  7 * modification, are permitted provided that the following conditions
  8 * are met:
  9 *
 10 * 1. Redistributions of source code must retain the above copyright
 11 *    notice, this list of conditions and the following disclaimer.
 12 *
 13 * 2. Redistributions in binary form must reproduce the above copyright
 14 *    notice, this list of conditions and the following disclaimer in the
 15 *    documentation and/or other materials provided with the distribution.
 16 *
 17 * 3. Neither the name of the Institute nor the names of its contributors
 18 *    may be used to endorse or promote products derived from this software
 19 *    without specific prior written permission.
 20 *
 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 31 * SUCH DAMAGE.
 32 */
 33
 34#include <config.h>
 35
 36#include <stdarg.h>
 37#include <stdlib.h>
 38#include "roken.h"
 39
 40struct rk_strpool {
 41    char *str;
 42    size_t len;
 43};
 44
 45/*
 46 *
 47 */
 48
 49ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
 50rk_strpoolfree(struct rk_strpool *p)
 51{
 52    if (p->str) {
 53	free(p->str);
 54	p->str = NULL;
 55    }
 56    free(p);
 57}
 58
 59/*
 60 *
 61 */
 62
 63ROKEN_LIB_FUNCTION struct rk_strpool * ROKEN_LIB_CALL
 64rk_strpoolprintf(struct rk_strpool *p, const char *fmt, ...)
 65{
 66    va_list ap;
 67    char *str, *str2;
 68    int len;
 69
 70    if (p == NULL) {
 71	p = malloc(sizeof(*p));
 72	if (p == NULL)
 73	    return NULL;
 74	p->str = NULL;
 75	p->len = 0;
 76    }
 77    va_start(ap, fmt);
 78    len = vasprintf(&str, fmt, ap);
 79    va_end(ap);
 80    if (str == NULL) {
 81	rk_strpoolfree(p);
 82	return NULL;
 83    }
 84    str2 = realloc(p->str, len + p->len + 1);
 85    if (str2 == NULL) {
 86	rk_strpoolfree(p);
 87	return NULL;
 88    }
 89    p->str = str2;
 90    memcpy(p->str + p->len, str, len + 1);
 91    p->len += len;
 92    free(str);
 93    return p;
 94}
 95
 96/*
 97 *
 98 */
 99
100ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
101rk_strpoolcollect(struct rk_strpool *p)
102{
103    char *str;
104    if (p == NULL)
105	return strdup("");
106    str = p->str;
107    p->str = NULL;
108    free(p);
109    return str;
110}