| The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* $NetBSD: mystring.c,v 1.16 2003/08/07 09:05:35 agc Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1991, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to Berkeley by |
| 8 | * Kenneth Almquist. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 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. |
| 21 | * |
| 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 |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #include <sys/cdefs.h> |
| 36 | #ifndef lint |
| 37 | #if 0 |
| 38 | static char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95"; |
| 39 | #else |
| 40 | __RCSID("$NetBSD: mystring.c,v 1.16 2003/08/07 09:05:35 agc Exp $"); |
| 41 | #endif |
| 42 | #endif /* not lint */ |
| 43 | |
| 44 | /* |
| 45 | * String functions. |
| 46 | * |
| 47 | * equal(s1, s2) Return true if strings are equal. |
| 48 | * scopy(from, to) Copy a string. |
| 49 | * scopyn(from, to, n) Like scopy, but checks for overflow. |
| 50 | * number(s) Convert a string of digits to an integer. |
| 51 | * is_number(s) Return true if s is a string of digits. |
| 52 | */ |
| 53 | |
| 54 | #include <stdlib.h> |
| 55 | #include "shell.h" |
| 56 | #include "syntax.h" |
| 57 | #include "error.h" |
| 58 | #include "mystring.h" |
| 59 | |
| 60 | |
| 61 | char nullstr[1]; /* zero length string */ |
| 62 | |
| 63 | /* |
| 64 | * equal - #defined in mystring.h |
| 65 | */ |
| 66 | |
| 67 | /* |
| 68 | * scopy - #defined in mystring.h |
| 69 | */ |
| 70 | |
| 71 | |
| 72 | /* |
| 73 | * scopyn - copy a string from "from" to "to", truncating the string |
| 74 | * if necessary. "To" is always nul terminated, even if |
| 75 | * truncation is performed. "Size" is the size of "to". |
| 76 | */ |
| 77 | |
| 78 | void |
| 79 | scopyn(const char *from, char *to, int size) |
| 80 | { |
| 81 | |
| 82 | while (--size > 0) { |
| 83 | if ((*to++ = *from++) == '\0') |
| 84 | return; |
| 85 | } |
| 86 | *to = '\0'; |
| 87 | } |
| 88 | |
| 89 | |
| 90 | /* |
| 91 | * prefix -- see if pfx is a prefix of string. |
| 92 | */ |
| 93 | |
| 94 | int |
| 95 | prefix(const char *pfx, const char *string) |
| 96 | { |
| 97 | while (*pfx) { |
| 98 | if (*pfx++ != *string++) |
| 99 | return 0; |
| 100 | } |
| 101 | return 1; |
| 102 | } |
| 103 | |
| 104 | |
| 105 | /* |
| 106 | * Convert a string of digits to an integer, printing an error message on |
| 107 | * failure. |
| 108 | */ |
| 109 | |
| 110 | int |
| 111 | number(const char *s) |
| 112 | { |
| 113 | |
| 114 | if (! is_number(s)) |
| 115 | error("Illegal number: %s", s); |
| 116 | return atoi(s); |
| 117 | } |
| 118 | |
| 119 | |
| 120 | |
| 121 | /* |
| 122 | * Check for a valid number. This should be elsewhere. |
| 123 | */ |
| 124 | |
| 125 | int |
| 126 | is_number(const char *p) |
| 127 | { |
| 128 | do { |
| 129 | if (! is_digit(*p)) |
| 130 | return 0; |
| 131 | } while (*++p != '\0'); |
| 132 | return 1; |
| 133 | } |