diff options
| -rw-r--r-- | gnu/usr.bin/bc/bcwrap/Makefile | 8 | ||||
| -rw-r--r-- | gnu/usr.bin/bc/bcwrap/bcwrap.c | 114 |
2 files changed, 122 insertions, 0 deletions
diff --git a/gnu/usr.bin/bc/bcwrap/Makefile b/gnu/usr.bin/bc/bcwrap/Makefile new file mode 100644 index 00000000000..e8d93c81a16 --- /dev/null +++ b/gnu/usr.bin/bc/bcwrap/Makefile @@ -0,0 +1,8 @@ +# $NetBSD: Makefile,v 1.9 1994/12/02 00:43:17 phil Exp $ + +BINDIR?= /usr/bin +PROG= bc +SRCS= bcwrap.c +NOMAN= + +.include <bsd.prog.mk> diff --git a/gnu/usr.bin/bc/bcwrap/bcwrap.c b/gnu/usr.bin/bc/bcwrap/bcwrap.c new file mode 100644 index 00000000000..0c6e3c013c5 --- /dev/null +++ b/gnu/usr.bin/bc/bcwrap/bcwrap.c @@ -0,0 +1,114 @@ +/* $OpenBSD: bcwrap.c,v 1.1 1996/06/20 14:29:49 deraadt Exp $ */ + +/* + * Copyright (c) 1996 Theo de Raadt <deraadt@theos.com> + * 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 Theo de Raadt. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + */ + +/* + * GNU bc wants to print it's copyright, if in interactive mode. The + * copyright demands it. That's stupid, ugly, and I think looks very + * gross. + * + * Oh well, with this wrapper it's never in interactive mode. + */ + +#include <sys/types.h> +#include <sys/wait.h> +#include <stdio.h> +#include <unistd.h> +#include <errno.h> + +int +main(argc, argv) + int argc; + char *argv[]; +{ + int pd[2], rfds; + int width = 1, off, n, res; + char buf[1024]; + int pid, stat; + + if (!(isatty(0) && isatty(1))) + execv("/usr/bin/gnubc", argv); + + /* Ok, we need to go non-interactive */ + if (pipe(pd) == -1) { + perror("pipe"); + exit(1); + } + + pid = fork(); + switch(pid) { + case -1: + perror("vfork"); + exit(1); + case 0: + dup2(pd[0], 0); /* stdin = pipe */ + close(pd[0]); + + close(pd[1]); + execv("/usr/bin/gnubc", argv); + exit(1); + default: + close(pd[0]); + break; + } + + width = pd[1]; + rfds = (1 << 0) || (1 << pd[1]); + while (1) { + switch (select(width, (fd_set *)&rfds, NULL, NULL, NULL)) { + case -1: + case 0: + break; + default: + if (rfds & (1<<0) == 0) + break; + n = read(0, buf, sizeof buf); + if (n == 0) { + close(pd[1]); + goto done; + } + off = 0; + while (off < n) { + res = write(pd[1], buf + off, n - off); + if (res == -1 && errno != EAGAIN) { + close(pd[1]); + goto done; + } + off += res; + } + } + } +done: + close(pd[1]); + waitpid(pid, &stat, 0); + exit(WEXITSTATUS(stat)); +} |