11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD$"); 401556Srgrimes 411556Srgrimes/* 421556Srgrimes * String functions. 431556Srgrimes * 441556Srgrimes * equal(s1, s2) Return true if strings are equal. 451556Srgrimes * number(s) Convert a string of digits to an integer. 461556Srgrimes * is_number(s) Return true if s is a string of digits. 471556Srgrimes */ 481556Srgrimes 4917987Speter#include <stdlib.h> 501556Srgrimes#include "shell.h" 511556Srgrimes#include "syntax.h" 521556Srgrimes#include "error.h" 531556Srgrimes#include "mystring.h" 541556Srgrimes 551556Srgrimes 561556Srgrimeschar nullstr[1]; /* zero length string */ 571556Srgrimes 581556Srgrimes/* 591556Srgrimes * equal - #defined in mystring.h 601556Srgrimes */ 611556Srgrimes 621556Srgrimes 631556Srgrimes/* 641556Srgrimes * prefix -- see if pfx is a prefix of string. 651556Srgrimes */ 661556Srgrimes 671556Srgrimesint 6890111Simpprefix(const char *pfx, const char *string) 6990111Simp{ 701556Srgrimes while (*pfx) { 711556Srgrimes if (*pfx++ != *string++) 721556Srgrimes return 0; 731556Srgrimes } 741556Srgrimes return 1; 751556Srgrimes} 761556Srgrimes 771556Srgrimes 781556Srgrimes/* 791556Srgrimes * Convert a string of digits to an integer, printing an error message on 801556Srgrimes * failure. 811556Srgrimes */ 821556Srgrimes 831556Srgrimesint 8490111Simpnumber(const char *s) 8590111Simp{ 861556Srgrimes if (! is_number(s)) 87201053Sjilles error("Illegal number: %s", s); 881556Srgrimes return atoi(s); 891556Srgrimes} 901556Srgrimes 911556Srgrimes 921556Srgrimes 931556Srgrimes/* 941556Srgrimes * Check for a valid number. This should be elsewhere. 951556Srgrimes */ 961556Srgrimes 971556Srgrimesint 9890111Simpis_number(const char *p) 9990111Simp{ 1001556Srgrimes do { 1011556Srgrimes if (! is_digit(*p)) 1021556Srgrimes return 0; 1031556Srgrimes } while (*++p != '\0'); 1041556Srgrimes return 1; 1051556Srgrimes} 106