14b88c807SRodney W. Grimes /*- 24b88c807SRodney W. Grimes * Copyright (c) 1991, 1993 34b88c807SRodney W. Grimes * The Regents of the University of California. All rights reserved. 44b88c807SRodney W. Grimes * 54b88c807SRodney W. Grimes * This code is derived from software contributed to Berkeley by 64b88c807SRodney W. Grimes * Kenneth Almquist. 74b88c807SRodney W. Grimes * 84b88c807SRodney W. Grimes * Redistribution and use in source and binary forms, with or without 94b88c807SRodney W. Grimes * modification, are permitted provided that the following conditions 104b88c807SRodney W. Grimes * are met: 114b88c807SRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 124b88c807SRodney W. Grimes * notice, this list of conditions and the following disclaimer. 134b88c807SRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 144b88c807SRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 154b88c807SRodney W. Grimes * documentation and/or other materials provided with the distribution. 164b88c807SRodney W. Grimes * 3. All advertising materials mentioning features or use of this software 174b88c807SRodney W. Grimes * must display the following acknowledgement: 184b88c807SRodney W. Grimes * This product includes software developed by the University of 194b88c807SRodney W. Grimes * California, Berkeley and its contributors. 204b88c807SRodney W. Grimes * 4. Neither the name of the University nor the names of its contributors 214b88c807SRodney W. Grimes * may be used to endorse or promote products derived from this software 224b88c807SRodney W. Grimes * without specific prior written permission. 234b88c807SRodney W. Grimes * 244b88c807SRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 254b88c807SRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 264b88c807SRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 274b88c807SRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 284b88c807SRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 294b88c807SRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 304b88c807SRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 314b88c807SRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 324b88c807SRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 334b88c807SRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 344b88c807SRodney W. Grimes * SUCH DAMAGE. 3589730b29SDavid Greenman * 36aa9caaf6SPeter Wemm * $Id: mystring.c,v 1.2 1994/09/24 02:57:59 davidg Exp $ 374b88c807SRodney W. Grimes */ 384b88c807SRodney W. Grimes 394b88c807SRodney W. Grimes #ifndef lint 40aa9caaf6SPeter Wemm static char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95"; 414b88c807SRodney W. Grimes #endif /* not lint */ 424b88c807SRodney W. Grimes 434b88c807SRodney W. Grimes /* 444b88c807SRodney W. Grimes * String functions. 454b88c807SRodney W. Grimes * 464b88c807SRodney W. Grimes * equal(s1, s2) Return true if strings are equal. 474b88c807SRodney W. Grimes * scopy(from, to) Copy a string. 484b88c807SRodney W. Grimes * scopyn(from, to, n) Like scopy, but checks for overflow. 494b88c807SRodney W. Grimes * number(s) Convert a string of digits to an integer. 504b88c807SRodney W. Grimes * is_number(s) Return true if s is a string of digits. 514b88c807SRodney W. Grimes */ 524b88c807SRodney W. Grimes 53aa9caaf6SPeter Wemm #include <stdlib.h> 544b88c807SRodney W. Grimes #include "shell.h" 554b88c807SRodney W. Grimes #include "syntax.h" 564b88c807SRodney W. Grimes #include "error.h" 574b88c807SRodney W. Grimes #include "mystring.h" 584b88c807SRodney W. Grimes 594b88c807SRodney W. Grimes 604b88c807SRodney W. Grimes char nullstr[1]; /* zero length string */ 614b88c807SRodney W. Grimes 624b88c807SRodney W. Grimes /* 634b88c807SRodney W. Grimes * equal - #defined in mystring.h 644b88c807SRodney W. Grimes */ 654b88c807SRodney W. Grimes 664b88c807SRodney W. Grimes /* 674b88c807SRodney W. Grimes * scopy - #defined in mystring.h 684b88c807SRodney W. Grimes */ 694b88c807SRodney W. Grimes 704b88c807SRodney W. Grimes 714b88c807SRodney W. Grimes /* 724b88c807SRodney W. Grimes * scopyn - copy a string from "from" to "to", truncating the string 734b88c807SRodney W. Grimes * if necessary. "To" is always nul terminated, even if 744b88c807SRodney W. Grimes * truncation is performed. "Size" is the size of "to". 754b88c807SRodney W. Grimes */ 764b88c807SRodney W. Grimes 774b88c807SRodney W. Grimes void 784b88c807SRodney W. Grimes scopyn(from, to, size) 794b88c807SRodney W. Grimes register char const *from; 804b88c807SRodney W. Grimes register char *to; 814b88c807SRodney W. Grimes register int size; 824b88c807SRodney W. Grimes { 834b88c807SRodney W. Grimes 844b88c807SRodney W. Grimes while (--size > 0) { 854b88c807SRodney W. Grimes if ((*to++ = *from++) == '\0') 864b88c807SRodney W. Grimes return; 874b88c807SRodney W. Grimes } 884b88c807SRodney W. Grimes *to = '\0'; 894b88c807SRodney W. Grimes } 904b88c807SRodney W. Grimes 914b88c807SRodney W. Grimes 924b88c807SRodney W. Grimes /* 934b88c807SRodney W. Grimes * prefix -- see if pfx is a prefix of string. 944b88c807SRodney W. Grimes */ 954b88c807SRodney W. Grimes 964b88c807SRodney W. Grimes int 974b88c807SRodney W. Grimes prefix(pfx, string) 984b88c807SRodney W. Grimes register char const *pfx; 994b88c807SRodney W. Grimes register char const *string; 1004b88c807SRodney W. Grimes { 1014b88c807SRodney W. Grimes while (*pfx) { 1024b88c807SRodney W. Grimes if (*pfx++ != *string++) 1034b88c807SRodney W. Grimes return 0; 1044b88c807SRodney W. Grimes } 1054b88c807SRodney W. Grimes return 1; 1064b88c807SRodney W. Grimes } 1074b88c807SRodney W. Grimes 1084b88c807SRodney W. Grimes 1094b88c807SRodney W. Grimes /* 1104b88c807SRodney W. Grimes * Convert a string of digits to an integer, printing an error message on 1114b88c807SRodney W. Grimes * failure. 1124b88c807SRodney W. Grimes */ 1134b88c807SRodney W. Grimes 1144b88c807SRodney W. Grimes int 1154b88c807SRodney W. Grimes number(s) 1164b88c807SRodney W. Grimes const char *s; 1174b88c807SRodney W. Grimes { 1184b88c807SRodney W. Grimes 1194b88c807SRodney W. Grimes if (! is_number(s)) 1204b88c807SRodney W. Grimes error2("Illegal number", (char *)s); 1214b88c807SRodney W. Grimes return atoi(s); 1224b88c807SRodney W. Grimes } 1234b88c807SRodney W. Grimes 1244b88c807SRodney W. Grimes 1254b88c807SRodney W. Grimes 1264b88c807SRodney W. Grimes /* 1274b88c807SRodney W. Grimes * Check for a valid number. This should be elsewhere. 1284b88c807SRodney W. Grimes */ 1294b88c807SRodney W. Grimes 1304b88c807SRodney W. Grimes int 1314b88c807SRodney W. Grimes is_number(p) 1324b88c807SRodney W. Grimes register const char *p; 1334b88c807SRodney W. Grimes { 1344b88c807SRodney W. Grimes do { 1354b88c807SRodney W. Grimes if (! is_digit(*p)) 1364b88c807SRodney W. Grimes return 0; 1374b88c807SRodney W. Grimes } while (*++p != '\0'); 1384b88c807SRodney W. Grimes return 1; 1394b88c807SRodney W. Grimes } 140