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| 2714 | cejka | 1 | /* $NetBSD: mystring.c,v 1.14 1999/07/09 03:05:50 christos Exp $ */ |
| 2 | |||
| 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. All advertising materials mentioning features or use of this software |
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| 19 | * must display the following acknowledgement: |
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| 20 | * This product includes software developed by the University of |
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| 21 | * California, Berkeley and its contributors. |
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| 22 | * 4. Neither the name of the University nor the names of its contributors |
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| 23 | * may be used to endorse or promote products derived from this software |
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| 24 | * without specific prior written permission. |
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| 25 | * |
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| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 36 | * SUCH DAMAGE. |
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| 37 | */ |
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| 38 | |||
| 39 | #include <sys/cdefs.h> |
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| 40 | #ifndef lint |
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| 41 | #if 0 |
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| 42 | static char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95"; |
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| 43 | #else |
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| 44 | __RCSID("$NetBSD: mystring.c,v 1.14 1999/07/09 03:05:50 christos Exp $"); |
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| 45 | #endif |
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| 46 | #endif /* not lint */ |
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| 47 | |||
| 48 | /* |
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| 49 | * String functions. |
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| 50 | * |
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| 51 | * equal(s1, s2) Return true if strings are equal. |
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| 52 | * scopy(from, to) Copy a string. |
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| 53 | * scopyn(from, to, n) Like scopy, but checks for overflow. |
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| 54 | * number(s) Convert a string of digits to an integer. |
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| 55 | * is_number(s) Return true if s is a string of digits. |
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| 56 | */ |
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| 57 | |||
| 58 | #include <stdlib.h> |
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| 59 | #include "shell.h" |
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| 60 | #include "syntax.h" |
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| 61 | #include "error.h" |
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| 62 | #include "mystring.h" |
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| 63 | |||
| 64 | |||
| 65 | char nullstr[1]; /* zero length string */ |
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| 66 | |||
| 67 | /* |
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| 68 | * equal - #defined in mystring.h |
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| 69 | */ |
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| 70 | |||
| 71 | /* |
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| 72 | * scopy - #defined in mystring.h |
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| 73 | */ |
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| 74 | |||
| 75 | |||
| 76 | /* |
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| 77 | * scopyn - copy a string from "from" to "to", truncating the string |
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| 78 | * if necessary. "To" is always nul terminated, even if |
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| 79 | * truncation is performed. "Size" is the size of "to". |
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| 80 | */ |
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| 81 | |||
| 82 | void |
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| 83 | scopyn(from, to, size) |
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| 84 | char const *from; |
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| 85 | char *to; |
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| 86 | int size; |
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| 87 | { |
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| 88 | |||
| 89 | while (--size > 0) { |
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| 90 | if ((*to++ = *from++) == '\0') |
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| 91 | return; |
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| 92 | } |
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| 93 | *to = '\0'; |
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| 94 | } |
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| 95 | |||
| 96 | |||
| 97 | /* |
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| 98 | * prefix -- see if pfx is a prefix of string. |
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| 99 | */ |
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| 100 | |||
| 101 | int |
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| 102 | prefix(pfx, string) |
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| 103 | char const *pfx; |
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| 104 | char const *string; |
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| 105 | { |
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| 106 | while (*pfx) { |
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| 107 | if (*pfx++ != *string++) |
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| 108 | return 0; |
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| 109 | } |
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| 110 | return 1; |
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| 111 | } |
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| 112 | |||
| 113 | |||
| 114 | /* |
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| 115 | * Convert a string of digits to an integer, printing an error message on |
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| 116 | * failure. |
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| 117 | */ |
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| 118 | |||
| 119 | int |
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| 120 | number(s) |
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| 121 | const char *s; |
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| 122 | { |
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| 123 | |||
| 124 | if (! is_number(s)) |
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| 125 | error("Illegal number: %s", s); |
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| 126 | return atoi(s); |
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| 127 | } |
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| 128 | |||
| 129 | |||
| 130 | |||
| 131 | /* |
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| 132 | * Check for a valid number. This should be elsewhere. |
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| 133 | */ |
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| 134 | |||
| 135 | int |
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| 136 | is_number(p) |
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| 137 | const char *p; |
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| 138 | { |
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| 139 | do { |
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| 140 | if (! is_digit(*p)) |
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| 141 | return 0; |
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| 142 | } while (*++p != '\0'); |
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| 143 | return 1; |
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| 144 | } |