projects / apple / shell_cmds.git / blame
| Commit | Line | Data |
|---|---|---|
| 71aad674 | 1 | /*- |
| 254f12f7 A |
2 | * SPDX-License-Identifier: BSD-3-Clause |
| 3 | * | |
| 71aad674 A |
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. | |
| 254f12f7 | 18 | * 3. Neither the name of the University nor the names of its contributors |
| 71aad674 A |
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 | #ifndef lint | |
| 36 | #if 0 | |
| 37 | static char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95"; | |
| 38 | #endif | |
| 39 | #endif /* not lint */ | |
| 40 | #include <sys/cdefs.h> | |
| 254f12f7 | 41 | __FBSDID("$FreeBSD: head/bin/sh/mystring.c 326025 2017-11-20 19:49:47Z pfg $"); |
| 71aad674 A |
42 | |
| 43 | /* | |
| 44 | * String functions. | |
| 45 | * | |
| 46 | * equal(s1, s2) Return true if strings are equal. | |
| 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 | ||
| 58 | char nullstr[1]; /* zero length string */ | |
| 59 | ||
| 60 | /* | |
| 61 | * equal - #defined in mystring.h | |
| 62 | */ | |
| 63 | ||
| 64 | ||
| 65 | /* | |
| 66 | * Convert a string of digits to an integer, printing an error message on | |
| 67 | * failure. | |
| 68 | */ | |
| 69 | ||
| 70 | int | |
| 71 | number(const char *s) | |
| 72 | { | |
| 73 | if (! is_number(s)) | |
| 74 | error("Illegal number: %s", s); | |
| 75 | return atoi(s); | |
| 76 | } | |
| 77 | ||
| 78 | ||
| 79 | ||
| 80 | /* | |
| 81 | * Check for a valid number. This should be elsewhere. | |
| 82 | */ | |
| 83 | ||
| 84 | int | |
| 85 | is_number(const char *p) | |
| 86 | { | |
| 87 | const char *q; | |
| 88 | ||
| 89 | if (*p == '\0') | |
| 90 | return 0; | |
| 91 | while (*p == '0') | |
| 92 | p++; | |
| 93 | for (q = p; *q != '\0'; q++) | |
| 94 | if (! is_digit(*q)) | |
| 95 | return 0; | |
| 96 | if (q - p > 10 || | |
| 97 | (q - p == 10 && memcmp(p, "2147483647", 10) > 0)) | |
| 98 | return 0; | |
| 99 | return 1; | |
| 100 | } |