#!/bin/sh
# This is a shar archive.
# The rest of this file is a shell script which will extract:
#
# 3_9a.c 3_9a.cmp 3_9atst.c 3_9b.c 3_9b.cmp 3_9btst.c makefile
#
# To extract the files from this shell archive file simply
# create a directory for this file, move the archive file
# to it and enter the command
#
#	sh filename
# 
# The files will be extracted automatically.
# Note: Do not use csh.
#
# Archive created: Mon Jul 30 22:59:42 EDT 1990
#
echo x - 3_9a.c
sed 's/^X//' > 3_9a.c << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// concatenate the two strings s1 and s2 into
// a new string allocated on the free store
#include <string.h>
char *cat(const char *s1, const char *s2)
{
    if (!s1 || !s2)
	return 0;

    int length1 = strlen(s1);
    char *ret = new char [ length1 + strlen(s2) + 1 ];

    strcpy(ret, s1);
    strcpy(ret + length1, s2);
    return ret;
}
!EOF!
ls -l 3_9a.c
echo x - 3_9a.cmp
sed 's/^X//' > 3_9a.cmp << '!EOF!'
a='', b='', ab=''
a='', b='The quick brown fox jumped over the lazy brown dog', ab='The quick brown fox jumped over the lazy brown dog'
a='', b='This is a test', ab='This is a test'
a='', b='abc', ab='abc'
a='', b='abcd', ab='abcd'
a='', b='abcda', ab='abcda'
a='', b='abdc', ab='abdc'
a='', b='hello there', ab='hello there'
a='The quick brown fox jumped over the lazy brown dog', b='', ab='The quick brown fox jumped over the lazy brown dog'
a='The quick brown fox jumped over the lazy brown dog', b='The quick brown fox jumped over the lazy brown dog', ab='The quick brown fox jumped over the lazy brown dogThe quick brown fox jumped over the lazy brown dog'
a='The quick brown fox jumped over the lazy brown dog', b='This is a test', ab='The quick brown fox jumped over the lazy brown dogThis is a test'
a='The quick brown fox jumped over the lazy brown dog', b='abc', ab='The quick brown fox jumped over the lazy brown dogabc'
a='The quick brown fox jumped over the lazy brown dog', b='abcd', ab='The quick brown fox jumped over the lazy brown dogabcd'
a='The quick brown fox jumped over the lazy brown dog', b='abcda', ab='The quick brown fox jumped over the lazy brown dogabcda'
a='The quick brown fox jumped over the lazy brown dog', b='abdc', ab='The quick brown fox jumped over the lazy brown dogabdc'
a='The quick brown fox jumped over the lazy brown dog', b='hello there', ab='The quick brown fox jumped over the lazy brown doghello there'
a='This is a test', b='', ab='This is a test'
a='This is a test', b='The quick brown fox jumped over the lazy brown dog', ab='This is a testThe quick brown fox jumped over the lazy brown dog'
a='This is a test', b='This is a test', ab='This is a testThis is a test'
a='This is a test', b='abc', ab='This is a testabc'
a='This is a test', b='abcd', ab='This is a testabcd'
a='This is a test', b='abcda', ab='This is a testabcda'
a='This is a test', b='abdc', ab='This is a testabdc'
a='This is a test', b='hello there', ab='This is a testhello there'
a='abc', b='', ab='abc'
a='abc', b='The quick brown fox jumped over the lazy brown dog', ab='abcThe quick brown fox jumped over the lazy brown dog'
a='abc', b='This is a test', ab='abcThis is a test'
a='abc', b='abc', ab='abcabc'
a='abc', b='abcd', ab='abcabcd'
a='abc', b='abcda', ab='abcabcda'
a='abc', b='abdc', ab='abcabdc'
a='abc', b='hello there', ab='abchello there'
a='abcd', b='', ab='abcd'
a='abcd', b='The quick brown fox jumped over the lazy brown dog', ab='abcdThe quick brown fox jumped over the lazy brown dog'
a='abcd', b='This is a test', ab='abcdThis is a test'
a='abcd', b='abc', ab='abcdabc'
a='abcd', b='abcd', ab='abcdabcd'
a='abcd', b='abcda', ab='abcdabcda'
a='abcd', b='abdc', ab='abcdabdc'
a='abcd', b='hello there', ab='abcdhello there'
a='abcda', b='', ab='abcda'
a='abcda', b='The quick brown fox jumped over the lazy brown dog', ab='abcdaThe quick brown fox jumped over the lazy brown dog'
a='abcda', b='This is a test', ab='abcdaThis is a test'
a='abcda', b='abc', ab='abcdaabc'
a='abcda', b='abcd', ab='abcdaabcd'
a='abcda', b='abcda', ab='abcdaabcda'
a='abcda', b='abdc', ab='abcdaabdc'
a='abcda', b='hello there', ab='abcdahello there'
a='abdc', b='', ab='abdc'
a='abdc', b='The quick brown fox jumped over the lazy brown dog', ab='abdcThe quick brown fox jumped over the lazy brown dog'
a='abdc', b='This is a test', ab='abdcThis is a test'
a='abdc', b='abc', ab='abdcabc'
a='abdc', b='abcd', ab='abdcabcd'
a='abdc', b='abcda', ab='abdcabcda'
a='abdc', b='abdc', ab='abdcabdc'
a='abdc', b='hello there', ab='abdchello there'
a='hello there', b='', ab='hello there'
a='hello there', b='The quick brown fox jumped over the lazy brown dog', ab='hello thereThe quick brown fox jumped over the lazy brown dog'
a='hello there', b='This is a test', ab='hello thereThis is a test'
a='hello there', b='abc', ab='hello thereabc'
a='hello there', b='abcd', ab='hello thereabcd'
a='hello there', b='abcda', ab='hello thereabcda'
a='hello there', b='abdc', ab='hello thereabdc'
a='hello there', b='hello there', ab='hello therehello there'
!EOF!
ls -l 3_9a.cmp
echo x - 3_9atst.c
sed 's/^X//' > 3_9atst.c << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
#include <stream.h>
#include <stream.h>

#include "3_9a.c"

char *x[] =
    {
    "",
    "The quick brown fox jumped over the lazy brown dog",
    "This is a test",
    "abc",
    "abcd",
    "abcda",
    "abdc",
    "hello there",
    0
    };

main()
{
    for (char **xp = x; *xp; xp++)
	for (char **yp = x; *yp; yp++)
	    cout << "a='" << *xp << "', b='" << *yp << "', ab='" << cat(*xp, *yp) << "'\n";
    return 0;
}
!EOF!
ls -l 3_9atst.c
echo x - 3_9b.c
sed 's/^X//' > 3_9b.c << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// reverse the characters within the string s
#include <swap.h>
#include <string.h>
void rev(char *s)
{
    if (!s)
	return;

    char *e = s + strlen(s) - 1;

    for ( ; s < e ; s++, e--)
	swap(*s, *e);
}
!EOF!
ls -l 3_9b.c
echo x - 3_9b.cmp
sed 's/^X//' > 3_9b.cmp << '!EOF!'
a=''
rev=''
a='The quick brown fox jumped over the lazy brown dog'
rev='god nworb yzal eht revo depmuj xof nworb kciuq ehT'
a='This is a test'
rev='tset a si sihT'
a='abc'
rev='cba'
a='abcd'
rev='dcba'
a='abcda'
rev='adcba'
a='abdc'
rev='cdba'
a='hello there'
rev='ereht olleh'
!EOF!
ls -l 3_9b.cmp
echo x - 3_9btst.c
sed 's/^X//' > 3_9btst.c << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
#include <stream.h>
#include <stream.h>

#include "3_9b.c"

char *x[] =
    {
    "",
    "The quick brown fox jumped over the lazy brown dog",
    "This is a test",
    "abc",
    "abcd",
    "abcda",
    "abdc",
    "hello there",
    0
    };

main()
{
    for (char **xp = x; *xp; xp++)
	{
	cout << "a='" << *xp << "'\n";
	rev(*xp);
	cout << "rev='" << *xp << "'\n";
	}
    return 0;
}
!EOF!
ls -l 3_9btst.c
echo x - makefile
sed 's/^X//' > makefile << '!EOF!'
CC= CC -I. -I../../CC
all: 3_9atst 3_9btst

3_9atst: 3_9atst.c 3_9a.c
	$(CC) 3_9atst.c -o 3_9atst

3_9btst: 3_9btst.c 3_9b.c
	$(CC) 3_9btst.c -o 3_9btst

test: all 3_9a.cmp 3_9b.cmp
	3_9atst > 3_9a.out
	cmp 3_9a.out 3_9a.cmp
	3_9btst > 3_9b.out
	cmp 3_9b.out 3_9b.cmp
	echo tests done
!EOF!
ls -l makefile
# The following exit is to ensure that extra garbage 
# after the end of the shar file will be ignored.
exit 0