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/* $NetBSD: mystring.c,v 1.15 2002/11/24 22:35:42 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 1.15 2002/11/24 22:35:42 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"
#include "memalloc.h"
#include "parser.h"
#include "system.h"
char nullstr[1]; /* zero length string */
const char spcstr[] = " ";
const char snlfmt[] = "%s\n";
const char dolatstr[] = { CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' };
const char illnum[] = "Illegal number: %s";
const char homestr[] = "HOME";
/*
* equal - #defined in mystring.h
*/
/*
* scopy - #defined in mystring.h
*/
#if 0
/*
* 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(const char *from, char *to, int size)
{
while (--size > 0) {
if ((*to++ = *from++) == '\0')
return;
}
*to = '\0';
}
#endif
/*
* prefix -- see if pfx is a prefix of string.
*/
char *
prefix(const char *string, const char *pfx)
{
while (*pfx) {
if (*pfx++ != *string++)
return 0;
}
return (char *) string;
}
/*
* Convert a string of digits to an integer, printing an error message on
* failure.
*/
int
number(const char *s)
{
if (! is_number(s))
error(illnum, 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;
}
/*
* Produce a possibly single quoted string suitable as input to the shell.
* The return string is allocated on the stack.
*/
char *
single_quote(const char *s) {
char *p;
STARTSTACKSTR(p);
do {
char *q;
size_t len;
len = strchrnul(s, '\'') - s;
q = p = makestrspace(len + 3, p);
*q++ = '\'';
q = mempcpy(q, s, len);
*q++ = '\'';
s += len;
STADJUST(q - p, p);
len = strspn(s, "'");
if (!len)
break;
q = p = makestrspace(len + 3, p);
*q++ = '"';
q = mempcpy(q, s, len);
*q++ = '"';
s += len;
STADJUST(q - p, p);
} while (*s);
USTPUTC(0, p);
return stackblock();
}
/*
* Like strdup but works with the ash stack.
*/
char *
sstrdup(const char *p)
{
size_t len = strlen(p) + 1;
return memcpy(stalloc(len), p, len);
}
/*
* Wrapper around strcmp for qsort/bsearch/...
*/
int
pstrcmp(const void *a, const void *b)
{
return strcmp(*(const char *const *) a, *(const char *const *) b);
}
/*
* Find a string is in a sorted array.
*/
const char *const *
findstring(const char *s, const char *const *array, size_t nmemb)
{
return bsearch(&s, array, nmemb, sizeof(const char *), pstrcmp);
}
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