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      1 /*	$NetBSD: strpool.c,v 1.2 2017/01/28 21:31:50 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2005 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <config.h>
     37 
     38 #include <stdarg.h>
     39 #include <stdlib.h>
     40 #include <krb5/roken.h>
     41 
     42 struct rk_strpool {
     43     char *str;
     44     size_t len;
     45 };
     46 
     47 /*
     48  *
     49  */
     50 
     51 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
     52 rk_strpoolfree(struct rk_strpool *p)
     53 {
     54     if (p->str) {
     55 	free(p->str);
     56 	p->str = NULL;
     57     }
     58     free(p);
     59 }
     60 
     61 /*
     62  *
     63  */
     64 
     65 ROKEN_LIB_FUNCTION struct rk_strpool * ROKEN_LIB_CALL
     66 rk_strpoolprintf(struct rk_strpool *p, const char *fmt, ...)
     67 {
     68     va_list ap;
     69     char *str, *str2;
     70     int len;
     71 
     72     if (p == NULL) {
     73 	p = malloc(sizeof(*p));
     74 	if (p == NULL)
     75 	    return NULL;
     76 	p->str = NULL;
     77 	p->len = 0;
     78     }
     79     va_start(ap, fmt);
     80     len = vasprintf(&str, fmt, ap);
     81     va_end(ap);
     82     if (str == NULL) {
     83 	rk_strpoolfree(p);
     84 	return NULL;
     85     }
     86     str2 = realloc(p->str, len + p->len + 1);
     87     if (str2 == NULL) {
     88 	rk_strpoolfree(p);
     89 	return NULL;
     90     }
     91     p->str = str2;
     92     memcpy(p->str + p->len, str, len + 1);
     93     p->len += len;
     94     free(str);
     95     return p;
     96 }
     97 
     98 /*
     99  *
    100  */
    101 
    102 ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
    103 rk_strpoolcollect(struct rk_strpool *p)
    104 {
    105     char *str;
    106     if (p == NULL)
    107 	return strdup("");
    108     str = p->str;
    109     p->str = NULL;
    110     free(p);
    111     return str;
    112 }
    113