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/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Kenneth Almquist. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint #if 0 static char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95"; #endif #endif /* not lint */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/bin/sh/mystring.c 231784 2012-02-15 21:52:14Z jilles $"); /* * String functions. * * equal(s1, s2) Return true if strings are equal. * scopy(from, to) Copy a string. * number(s) Convert a string of digits to an integer. * is_number(s) Return true if s is a string of digits. */ #include <stdlib.h> #include "shell.h" #include "syntax.h" #include "error.h" #include "mystring.h" char nullstr[1]; /* zero length string */ /* * equal - #defined in mystring.h */ /* * scopy - #defined in mystring.h */ /* * prefix -- see if pfx is a prefix of string. */ int prefix(const char *pfx, const char *string) { while (*pfx) { if (*pfx++ != *string++) return 0; } return 1; } /* * Convert a string of digits to an integer, printing an error message on * failure. */ int number(const char *s) { if (! is_number(s)) error("Illegal number: %s", s); return atoi(s); } /* * Check for a valid number. This should be elsewhere. */ int is_number(const char *p) { do { if (! is_digit(*p)) return 0; } while (*++p != '\0'); return 1; }