- 次は，UNIX のシェルコマンド
echo のソースファイルである。解読せよ。（Copyright は，UC Berkeley にあります。改良したものも含め，再配布するときは，copyright を必ず保持してください。）
/* $NetBSD: echo.c,v 1.9 2001/07/29 22:36:11 wiz Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* 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
__COPYRIGHT(
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)echo.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: echo.c,v 1.9 2001/07/29 22:36:11 wiz Exp $");
#endif
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int, char *[]);
/* ARGSUSED */
int
main(int argc, char *argv[])
{
int nflag;
/* This utility may NOT do getopt(3) option parsing. */
if (*++argv && !strcmp(*argv, "-n")) {
++argv;
nflag = 1;
}
else
nflag = 0;
while (*argv) {
(void)printf("%s", *argv);
if (*++argv)
(void)putchar(' ');
}
if (nflag == 0)
(void)putchar('\n');
exit(0);
/* NOTREACHED */
}
- 次は，ヘッダファイル
string.h にある strtok 関数のソースファイルである。解読せよ。但し，ソース中の _DIAGASSERT は，assert と置き換えてよい。（Copyright は，UC Berkeley にあります。改良したものも含め，再配布するときは，copyright を必ず保持してください。）
/* $NetBSD: strtok.c,v 1.10 1999/09/20 04:39:49 lukem Exp $ */
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* 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>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)strtok.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: strtok.c,v 1.10 1999/09/20 04:39:49 lukem Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include <assert.h>
#include <string.h>
char *
strtok(s, delim)
char *s;
const char *delim;
{
const char *spanp;
int c, sc;
char *tok;
static char *last;
/* s may be NULL */
_DIAGASSERT(delim != NULL);
if (s == NULL && (s = last) == NULL)
return (NULL);
/*
* Skip (span) leading delimiters (s += strspn(s, delim), sort of).
*/
cont:
c = *s++;
for (spanp = delim; (sc = *spanp++) != 0;) {
if (c == sc)
goto cont;
}
if (c == 0) { /* no non-delimiter characters */
last = NULL;
return (NULL);
}
tok = s - 1;
/*
* Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
* Note that delim must have one NUL; we stop if we see that, too.
*/
for (;;) {
c = *s++;
spanp = delim;
do {
if ((sc = *spanp++) == c) {
if (c == 0)
s = NULL;
else
s[-1] = 0;
last = s;
return (tok);
}
} while (sc != 0);
}
/* NOTREACHED */
}
- 次は，UNIX コマンド
tee のソースファイルである。解読せよ。（Copyright は，UC Berkeley にあります。改良したものも含め，再配布するときは，copyright を必ず保持してください。）
/* $NetBSD: tee.c,v 1.6 1997/10/20 00:37:11 lukem Exp $ */
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* 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
__COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)tee.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: tee.c,v 1.6 1997/10/20 00:37:11 lukem Exp $");
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <err.h>
typedef struct _list {
struct _list *next;
int fd;
char *name;
} LIST;
LIST *head;
void add __P((int, char *));
int main __P((int, char **));
int
main(argc, argv)
int argc;
char *argv[];
{
LIST *p;
int n, fd, rval, wval;
char *bp;
int append, ch, exitval;
char *buf;
#define BSIZE (8 * 1024)
setlocale(LC_ALL, "");
append = 0;
while ((ch = getopt(argc, argv, "ai")) != -1)
switch((char)ch) {
case 'a':
append = 1;
break;
case 'i':
(void)signal(SIGINT, SIG_IGN);
break;
case '?':
default:
(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
exit(1);
}
argv += optind;
argc -= optind;
if ((buf = malloc((size_t)BSIZE)) == NULL)
err(1, "malloc");
add(STDOUT_FILENO, "stdout");
for (exitval = 0; *argv; ++argv)
if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {
warn("%s", *argv);
exitval = 1;
} else
add(fd, *argv);
while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)
for (p = head; p; p = p->next) {
n = rval;
bp = buf;
do {
if ((wval = write(p->fd, bp, n)) == -1) {
warn("%s", p->name);
exitval = 1;
break;
}
bp += wval;
} while (n -= wval);
}
if (rval < 0) {
warn("read");
exitval = 1;
}
for (p = head; p; p = p->next) {
if (close(p->fd) == -1) {
warn("%s", p->name);
exitval = 1;
}
}
exit(exitval);
}
void
add(fd, name)
int fd;
char *name;
{
LIST *p;
if ((p = malloc((size_t)sizeof(LIST))) == NULL)
err(1, "malloc");
p->fd = fd;
p->name = name;
p->next = head;
head = p;
}
