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