2 * Copyright (c) 2003-2007 Tim Kientzle
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #include "archive_platform.h"
27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_string.c,v 1.9 2007/01/13 03:30:14 kientzle Exp $");
30 * Basic resizable string support, to simplify manipulating arbitrary-sized
31 * strings while minimizing heap activity.
41 #include "archive_private.h"
42 #include "archive_string.h"
44 struct archive_string *
45 __archive_string_append(struct archive_string *as, const char *p, size_t s)
47 __archive_string_ensure(as, as->length + s + 1);
48 memcpy(as->s + as->length, p, s);
49 as->s[as->length + s] = 0;
55 __archive_string_free(struct archive_string *as)
58 as->buffer_length = 0;
63 struct archive_string *
64 __archive_string_ensure(struct archive_string *as, size_t s)
66 if (as->s && (s <= as->buffer_length))
69 if (as->buffer_length < 32)
70 as->buffer_length = 32;
71 while (as->buffer_length < s)
72 as->buffer_length *= 2;
73 as->s = (char *)realloc(as->s, as->buffer_length);
74 /* TODO: Return null instead and fix up all of our callers to
75 * handle this correctly. */
77 __archive_errx(1, "Out of memory");
81 struct archive_string *
82 __archive_strncat(struct archive_string *as, const char *p, size_t n)
87 /* Like strlen(p), except won't examine positions beyond p[n]. */
90 while (*pp && s < n) {
94 return (__archive_string_append(as, p, s));
97 struct archive_string *
98 __archive_strappend_char(struct archive_string *as, char c)
100 return (__archive_string_append(as, &c, 1));
103 struct archive_string *
104 __archive_strappend_int(struct archive_string *as, int d, int base)
106 static const char *digits = "0123456789abcdef";
109 __archive_strappend_char(as, '-');
113 __archive_strappend_int(as, d/base, base);
114 __archive_strappend_char(as, digits[d % base]);