From e5888a1ffdae813d7575f5fb02275c6bb07e5199 Mon Sep 17 00:00:00 2001
From: Taru Karttunen <taruti@taruti.net>
Date: Wed, 30 Mar 2011 15:46:40 +0300
Subject: Import sources from 2011-03-30 iso image

---
 sys/src/ape/9src/tar.c | 127 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100755 sys/src/ape/9src/tar.c

(limited to 'sys/src/ape/9src/tar.c')

diff --git a/sys/src/ape/9src/tar.c b/sys/src/ape/9src/tar.c
new file mode 100755
index 000000000..b72e8d701
--- /dev/null
+++ b/sys/src/ape/9src/tar.c
@@ -0,0 +1,127 @@
+/*
+ * Attempt at emulation of Unix tar by calling Plan 9 tar.
+ * 
+ * The differences from Plan 9 tar are:
+ *	In the absence of an "f" flag, the file /dev/tape is used.
+ *	An "f" flag with argument "-" causes use of stdin/stdout
+ *		by passing no "f" flag (nor argument) to Plan 9 tar.
+ *	By default, the "T" flag is passed to Plan 9 tar.
+ *		The "m" flag to this tar inhibits this behavior.
+ */
+
+#include <u.h>
+#include <libc.h>
+
+void
+usage(void)
+{
+	fprint(2, "usage: ape/tar [crtx][vfm] [args...] [file...]\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	int i, j, verb, vflag, fflag, Tflag, nargc;
+	char *p, *file, **nargv, *cpu, flagbuf[10], execbuf[128];
+	Waitmsg *w;
+
+	argv++, argc--;
+	if(argc < 1)
+		usage();
+
+	p = argv[0];
+	argv++, argc--;
+
+	if(*p == '-')
+		p++;
+
+	if(strchr("crtx", *p) == nil)
+		usage();
+	verb = *p++;
+
+	/* unix defaults */
+	fflag = 1;
+	file = "/dev/tape";
+	Tflag = 1;
+	vflag = 0;
+
+	for(; *p; p++) {
+		switch(*p) {
+		default:
+			usage();
+		case 'v':
+			vflag = 1;
+			break;
+		case 'f':
+			if(argc <= 0)
+				usage();
+
+			fflag = 1;
+			file = argv[0];
+			argv++, argc--;
+			if(strcmp(file, "-") == 0) {
+				/*
+				 * plan9 doesn't know about "-" meaning stdin/stdout,
+				 * but it's the default,
+				 * so rewrite to not use f flag at all.
+				 */
+				file = nil;
+				fflag = 0;
+			}
+			break;
+		case 'm':
+			Tflag = 0;
+			break;
+		case 'p':		/* pretend nothing's wrong */
+			break;
+		}
+	}
+
+	nargc = 1 + 1 + fflag + argc + 1;
+	nargv = malloc(sizeof(char*) * nargc);
+	if(nargv == nil) {
+		fprint(2, "ape/tar: out of memory\n");
+		exits("memory");
+	}
+
+	cpu = getenv("cputype");
+	if(cpu == nil) {
+		fprint(2, "ape/tar: need cputype environment variable set\n");
+		exits("cputype");
+	}
+	snprint(execbuf, sizeof execbuf, "/%s/bin/tar", cpu);
+
+	nargv[0] = "tar";
+	sprint(flagbuf, "%c%s%s%s", verb, vflag ? "v" : "", Tflag ? "T" : "", fflag ? "f" : "");
+	nargv[1] = flagbuf;
+
+	i = 2;
+	if(fflag)
+		nargv[i++] = file;
+
+	for(j=0; j<argc; j++, i++)
+		nargv[i] = argv[j];
+
+	nargv[i++] = nil;
+	assert(i == nargc);
+
+	switch(fork()){
+	case -1:
+		fprint(2, "ape/tar: fork failed: %r\n");
+		exits("fork");
+	case 0:
+		exec(execbuf, nargv);
+		fprint(2, "exec %s fails: %r\n", execbuf);
+		_exits("exec");
+	default:
+		w = wait();
+		if(w == nil)
+			exits("wait failed");
+		if(w->msg[0] == '\0')
+			exits(nil);
+		else
+			exits(w->msg);
+	}
+	assert(0);
+}
-- 
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