2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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9 * modification, are permitted provided that the following conditions
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12 * notice, this list of conditions and the following disclaimer.
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18 * This product includes software developed by the University of
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36 * @(#)mystring.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/mystring.c,v 1.15 2012/01/01 22:15:38 jilles Exp $
43 * equal(s1, s2) Return true if strings are equal.
44 * scopy(from, to) Copy a string.
45 * number(s) Convert a string of digits to an integer.
46 * is_number(s) Return true if s is a string of digits.
56 char nullstr[1]; /* zero length string */
59 * equal - #defined in mystring.h
63 * scopy - #defined in mystring.h
68 * prefix -- see if pfx is a prefix of string.
72 prefix(const char *pfx, const char *string)
75 if (*pfx++ != *string++)
83 * Convert a string of digits to an integer, printing an error message on
91 error("Illegal number: %s", s);
98 * Check for a valid number. This should be elsewhere.
102 is_number(const char *p)
107 } while (*++p != '\0');