1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #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> 41 __FBSDID("$FreeBSD$"); 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 } 101