0,0 → 1,144 |
/* $NetBSD: mystring.c,v 1.14 1999/07/09 03:05:50 christos Exp $ */ |
|
/*- |
* 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. |
* 3. All advertising materials mentioning features or use of this software |
* must display the following acknowledgement: |
* This product includes software developed by the University of |
* California, Berkeley and its contributors. |
* 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. |
*/ |
|
#include <sys/cdefs.h> |
#ifndef lint |
#if 0 |
static char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95"; |
#else |
__RCSID("$NetBSD: mystring.c,v 1.14 1999/07/09 03:05:50 christos Exp $"); |
#endif |
#endif /* not lint */ |
|
/* |
* String functions. |
* |
* equal(s1, s2) Return true if strings are equal. |
* scopy(from, to) Copy a string. |
* scopyn(from, to, n) Like scopy, but checks for overflow. |
* 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 |
*/ |
|
|
/* |
* scopyn - copy a string from "from" to "to", truncating the string |
* if necessary. "To" is always nul terminated, even if |
* truncation is performed. "Size" is the size of "to". |
*/ |
|
void |
scopyn(from, to, size) |
char const *from; |
char *to; |
int size; |
{ |
|
while (--size > 0) { |
if ((*to++ = *from++) == '\0') |
return; |
} |
*to = '\0'; |
} |
|
|
/* |
* prefix -- see if pfx is a prefix of string. |
*/ |
|
int |
prefix(pfx, string) |
char const *pfx; |
char const *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(s) |
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(p) |
const char *p; |
{ |
do { |
if (! is_digit(*p)) |
return 0; |
} while (*++p != '\0'); |
return 1; |
} |