Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / bin / sh / mystring.c
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1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
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 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
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35 *
36 * @(#)mystring.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/mystring.c,v 1.10.2.1 2002/07/19 04:38:52 tjr Exp $
38 * $DragonFly: src/bin/sh/mystring.c,v 1.2 2003/06/17 04:22:50 dillon Exp $
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39 */
40
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41/*
42 * String functions.
43 *
44 * equal(s1, s2) Return true if strings are equal.
45 * scopy(from, to) Copy a string.
46 * scopyn(from, to, n) Like scopy, but checks for overflow.
47 * number(s) Convert a string of digits to an integer.
48 * is_number(s) Return true if s is a string of digits.
49 */
50
51#include <stdlib.h>
52#include "shell.h"
53#include "syntax.h"
54#include "error.h"
55#include "mystring.h"
56
57
58char nullstr[1]; /* zero length string */
59
60/*
61 * equal - #defined in mystring.h
62 */
63
64/*
65 * scopy - #defined in mystring.h
66 */
67
68
69/*
70 * scopyn - copy a string from "from" to "to", truncating the string
71 * if necessary. "To" is always nul terminated, even if
72 * truncation is performed. "Size" is the size of "to".
73 */
74
75void
76scopyn(const char *from, char *to, int size)
77{
78
79 while (--size > 0) {
80 if ((*to++ = *from++) == '\0')
81 return;
82 }
83 *to = '\0';
84}
85
86
87/*
88 * prefix -- see if pfx is a prefix of string.
89 */
90
91int
92prefix(const char *pfx, const char *string)
93{
94 while (*pfx) {
95 if (*pfx++ != *string++)
96 return 0;
97 }
98 return 1;
99}
100
101
102/*
103 * Convert a string of digits to an integer, printing an error message on
104 * failure.
105 */
106
107int
108number(const char *s)
109{
110 if (! is_number(s))
111 error("Illegal number: %s", (char *)s);
112 return atoi(s);
113}
114
115
116
117/*
118 * Check for a valid number. This should be elsewhere.
119 */
120
121int
122is_number(const char *p)
123{
124 do {
125 if (! is_digit(*p))
126 return 0;
127 } while (*++p != '\0');
128 return 1;
129}