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
8 * Redistribution and use in source and binary forms, with or without
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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14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
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36 * @(#)mystring.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/mystring.c,v 1.10.2.1 2002/07/19 04:38:52 tjr Exp $
38 * $DragonFly: src/bin/sh/mystring.c,v 1.3 2004/03/19 19:39:41 cpressey Exp $
44 * equal(s1, s2) Return true if strings are equal.
45 * scopy(from, to) Copy a string.
46 * scopyn(from, to, n) Like scopy, but checks for overflow.
47 * number(s) Convert a string of digits to an integer.
48 * is_number(s) Return true if s is a string of digits.
58 char nullstr
[1]; /* zero length string */
61 * equal - #defined in mystring.h
65 * scopy - #defined in mystring.h
70 * scopyn - copy a string from "from" to "to", truncating the string
71 * if necessary. "To" is always nul terminated, even if
72 * truncation is performed. "Size" is the size of "to".
76 scopyn(const char *from
, char *to
, int size
)
80 if ((*to
++ = *from
++) == '\0')
88 * prefix -- see if pfx is a prefix of string.
92 prefix(const char *pfx
, const char *string
)
95 if (*pfx
++ != *string
++)
103 * Convert a string of digits to an integer, printing an error message on
108 number(const char *s
)
111 error("Illegal number: %s", s
);
118 * Check for a valid number. This should be elsewhere.
122 is_number(const char *p
)
127 } while (*++p
!= '\0');