1 /*	$NetBSD: strcollect.c,v 1.1.1.1 2011/04/13 18:15:43 elric Exp $	*/
2 
3 /*
4  * Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
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 <string.h>
41 #include <errno.h>
42 #include <krb5/roken.h>
43 
44 enum { initial = 10, increment = 5 };
45 
46 static char **
47 sub (char **argv, int i, int argc, va_list *ap)
48 {
49     do {
50 	if(i == argc) {
51 	    /* realloc argv */
52 	    char **tmp = realloc(argv, (argc + increment) * sizeof(*argv));
53 	    if(tmp == NULL) {
54 		free(argv);
55 		errno = ENOMEM;
56 		return NULL;
57 	    }
58 	    argv  = tmp;
59 	    argc += increment;
60 	}
61 	argv[i++] = va_arg(*ap, char*);
62     } while(argv[i - 1] != NULL);
63     return argv;
64 }
65 
66 /*
67  * return a malloced vector of pointers to the strings in `ap'
68  * terminated by NULL.
69  */
70 
71 ROKEN_LIB_FUNCTION char ** ROKEN_LIB_CALL
72 vstrcollect(va_list *ap)
73 {
74     return sub (NULL, 0, 0, ap);
75 }
76 
77 /*
78  *
79  */
80 
81 ROKEN_LIB_FUNCTION char ** ROKEN_LIB_CALL
82 strcollect(char *first, ...)
83 {
84     va_list ap;
85     char **ret = malloc (initial * sizeof(char *));
86 
87     if (ret == NULL)
88 	return ret;
89 
90     ret[0] = first;
91     va_start(ap, first);
92     ret = sub (ret, 1, initial, &ap);
93     va_end(ap);
94     return ret;
95 }
96