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mystring.c

/*    $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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