| 1 | /* $NetBSD: mystring.c,v 1.16 2003/08/07 09:05:35 agc Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1991, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to Berkeley by
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| 8 | * Kenneth Almquist.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | * 3. Neither the name of the University nor the names of its contributors
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| 19 | * may be used to endorse or promote products derived from this software
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| 20 | * without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 32 | * SUCH DAMAGE.
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| 33 | */
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| 34 |
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| 35 | #include <sys/cdefs.h>
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| 36 | #ifndef lint
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| 37 | #if 0
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| 38 | static char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95";
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| 39 | #else
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| 40 | __RCSID("$NetBSD: mystring.c,v 1.16 2003/08/07 09:05:35 agc Exp $");
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| 41 | #endif
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| 42 | #endif /* not lint */
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| 43 |
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| 44 | /*
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| 45 | * String functions.
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| 46 | *
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| 47 | * equal(s1, s2) Return true if strings are equal.
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| 48 | * scopy(from, to) Copy a string.
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| 49 | * scopyn(from, to, n) Like scopy, but checks for overflow.
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| 50 | * number(s) Convert a string of digits to an integer.
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| 51 | * is_number(s) Return true if s is a string of digits.
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| 52 | */
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| 53 |
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| 54 | #include <stdlib.h>
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| 55 | #include "shell.h"
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| 56 | #include "syntax.h"
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| 57 | #include "error.h"
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| 58 | #include "mystring.h"
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| 59 |
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| 60 |
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| 61 | char nullstr[1]; /* zero length string */
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| 62 |
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| 63 | /*
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| 64 | * equal - #defined in mystring.h
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| 65 | */
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| 66 |
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| 67 | /*
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| 68 | * scopy - #defined in mystring.h
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| 69 | */
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| 70 |
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| 71 |
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| 72 | /*
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| 73 | * scopyn - copy a string from "from" to "to", truncating the string
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| 74 | * if necessary. "To" is always nul terminated, even if
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| 75 | * truncation is performed. "Size" is the size of "to".
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| 76 | */
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| 77 |
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| 78 | void
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| 79 | scopyn(const char *from, char *to, int size)
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| 80 | {
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| 81 |
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| 82 | while (--size > 0) {
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| 83 | if ((*to++ = *from++) == '\0')
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| 84 | return;
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| 85 | }
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| 86 | *to = '\0';
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| 87 | }
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| 88 |
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| 89 |
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| 90 | /*
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| 91 | * prefix -- see if pfx is a prefix of string.
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| 92 | */
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| 93 |
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| 94 | int
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| 95 | prefix(const char *pfx, const char *string)
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| 96 | {
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| 97 | while (*pfx) {
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| 98 | if (*pfx++ != *string++)
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| 99 | return 0;
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| 100 | }
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| 101 | return 1;
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| 102 | }
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| 103 |
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| 104 |
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| 105 | /*
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| 106 | * Convert a string of digits to an integer, printing an error message on
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| 107 | * failure.
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| 108 | */
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| 109 |
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| 110 | int
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| 111 | number(const char *s)
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| 112 | {
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| 113 |
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| 114 | if (! is_number(s))
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| 115 | error("Illegal number: %s", s);
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| 116 | return atoi(s);
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| 117 | }
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| 118 |
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| 119 |
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| 120 |
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| 121 | /*
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| 122 | * Check for a valid number. This should be elsewhere.
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| 123 | */
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| 124 |
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| 125 | int
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| 126 | is_number(const char *p)
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| 127 | {
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| 128 | do {
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| 129 | if (! is_digit(*p))
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| 130 | return 0;
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| 131 | } while (*++p != '\0');
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| 132 | return 1;
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| 133 | }
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