xref: /freebsd/crypto/heimdal/lib/roken/strcollect.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*
2  * Copyright (c) 1998, 1999 Kungliga Tekniska H�gskolan
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 #ifdef HAVE_CONFIG_H
35 #include <config.h>
36 RCSID("$Id: strcollect.c,v 1.1 2000/01/09 10:57:43 assar Exp $");
37 #endif
38 
39 #include <stdarg.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <errno.h>
43 #include <roken.h>
44 
45 enum { initial = 10, increment = 5 };
46 
47 static char **
48 sub (char **argv, int i, int argc, va_list *ap)
49 {
50     do {
51 	if(i == argc) {
52 	    /* realloc argv */
53 	    char **tmp = realloc(argv, (argc + increment) * sizeof(*argv));
54 	    if(tmp == NULL) {
55 		free(argv);
56 		errno = ENOMEM;
57 		return NULL;
58 	    }
59 	    argv  = tmp;
60 	    argc += increment;
61 	}
62 	argv[i++] = va_arg(*ap, char*);
63     } while(argv[i - 1] != NULL);
64     return argv;
65 }
66 
67 /*
68  * return a malloced vector of pointers to the strings in `ap'
69  * terminated by NULL.
70  */
71 
72 char **
73 vstrcollect(va_list *ap)
74 {
75     return sub (NULL, 0, 0, ap);
76 }
77 
78 /*
79  *
80  */
81 
82 char **
83 strcollect(char *first, ...)
84 {
85     va_list ap;
86     char **ret = malloc (initial * sizeof(char *));
87 
88     if (ret == NULL)
89 	return ret;
90 
91     ret[0] = first;
92     va_start(ap, first);
93     ret = sub (ret, 1, initial, &ap);
94     va_end(ap);
95     return ret;
96 }
97