1 /* $NetBSD: buf.c,v 1.51 2021/01/30 21:18:14 rillig Exp $ */
4 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * Copyright (c) 1988, 1989 by Adam de Boor
37 * Copyright (c) 1989 by Berkeley Softworks
38 * All rights reserved.
40 * This code is derived from software contributed to Berkeley by
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 3. All advertising materials mentioning features or use of this software
52 * must display the following acknowledgement:
53 * This product includes software developed by the University of
54 * California, Berkeley and its contributors.
55 * 4. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
72 /* Automatically-expanding null-terminated character buffers. */
77 /* "@(#)buf.c 8.1 (Berkeley) 6/6/93" */
78 MAKE_RCSID("$NetBSD: buf.c,v 1.51 2021/01/30 21:18:14 rillig Exp $");
80 /* Make space in the buffer for adding at least 16 more bytes. */
82 Buf_Expand(Buffer *buf)
84 buf->cap += buf->cap > 16 ? buf->cap : 16;
85 buf->data = bmake_realloc(buf->data, buf->cap);
88 /* Add the bytes to the buffer. */
90 Buf_AddBytes(Buffer *buf, const char *bytes, size_t bytes_len)
92 size_t old_len = buf->len;
95 if (old_len + bytes_len >= buf->cap) {
96 size_t minIncr = bytes_len + 16;
97 buf->cap += buf->cap > minIncr ? buf->cap : minIncr;
98 buf->data = bmake_realloc(buf->data, buf->cap);
101 end = buf->data + old_len;
102 buf->len = old_len + bytes_len;
103 memcpy(end, bytes, bytes_len);
104 end[bytes_len] = '\0';
107 /* Add the bytes between start and end to the buffer. */
109 Buf_AddBytesBetween(Buffer *buf, const char *start, const char *end)
111 Buf_AddBytes(buf, start, (size_t)(end - start));
114 /* Add the string to the buffer. */
116 Buf_AddStr(Buffer *buf, const char *str)
118 Buf_AddBytes(buf, str, strlen(str));
121 /* Add the number to the buffer. */
123 Buf_AddInt(Buffer *buf, int n)
126 bits = sizeof(int) * CHAR_BIT,
127 max_octal_digits = (bits + 2) / 3,
128 max_decimal_digits = /* at most */ max_octal_digits,
130 str_size = max_sign_chars + max_decimal_digits + 1
134 size_t len = (size_t)snprintf(str, sizeof str, "%d", n);
135 Buf_AddBytes(buf, str, len);
138 /* Mark the buffer as empty, so it can be filled with data again. */
140 Buf_Empty(Buffer *buf)
146 /* Initialize a buffer. */
148 Buf_InitSize(Buffer *buf, size_t cap)
152 buf->data = bmake_malloc(cap);
157 Buf_Init(Buffer *buf)
159 Buf_InitSize(buf, 256);
163 * Free the data from the buffer.
164 * Leave the buffer itself in an indeterminate state.
167 Buf_Done(Buffer *buf)
179 * Return the data from the buffer.
180 * Leave the buffer itself in an indeterminate state.
183 Buf_DoneData(Buffer *buf)
185 char *data = buf->data;
196 #ifndef BUF_COMPACT_LIMIT
197 # define BUF_COMPACT_LIMIT 128 /* worthwhile saving */
201 * Return the data from the buffer.
202 * Leave the buffer itself in an indeterminate state.
204 * If the buffer size is much greater than its content,
205 * a new buffer will be allocated and the old one freed.
208 Buf_DoneDataCompact(Buffer *buf)
210 #if BUF_COMPACT_LIMIT > 0
211 if (buf->cap - buf->len >= BUF_COMPACT_LIMIT) {
212 /* We trust realloc to be smart */
213 char *data = bmake_realloc(buf->data, buf->len + 1);
214 data[buf->len] = '\0'; /* XXX: unnecessary */
219 return Buf_DoneData(buf);