utils

commit 4575b7d9bc5e91c8388c8f54e8eb2a292a33920b
parent a76ea7e6295e385fd208e7d4b315bb528ec245ea
Author: Paco Esteban <paco@e1e0.net>
Date:   Sat, 14 Mar 2020 19:20:45 +0100

add the getcwd utility by sthen and schwarze

Diffstat:
A
getcwd/.gitignore
 | 
2
++
A
getcwd/Makefile
 | 
17
+++++++++++++++++
A
getcwd/getcwd.c
 | 
92
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3 files changed, 111 insertions(+), 0 deletions(-)
diff --git a/getcwd/.gitignore b/getcwd/.gitignore
@@ -0,0 +1,2 @@
+getcwd
+*.o
diff --git a/getcwd/Makefile b/getcwd/Makefile
@@ -0,0 +1,17 @@
+CC = clang
+PREFIX = /usr/local
+
+.PHONY: all clean
+.SUFFIXES: .in.1 .1
+
+all: getcwd
+
+clean:
+	rm -f getcwd
+
+install: all
+	install -d -m 0755 $(PREFIX)/bin
+	install -m 0755 getcwd $(PREFIX)/bin
+
+getcwd: getcwd.o
+	$(CC) -o getcwd getcwd.o
diff --git a/getcwd/getcwd.c b/getcwd/getcwd.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2020 Stuart Henderson <stu@spacehopper.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * witH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <vis.h>
+#include <wchar.h>
+
+void
+mbswprint(const char *mbs)
+{
+	char	  buf[5];
+	wchar_t	  wc;
+	int	  len;  /* length in bytes of UTF-8 encoded string */
+	int	  width;  /* display width of a single Unicode char */
+
+	while (*mbs != '\0') {
+		len = mbtowc(&wc, mbs, MB_CUR_MAX);
+		if (len == -1) {
+			(void)mbtowc(NULL, NULL, MB_CUR_MAX);
+			len = 1;
+		}
+		if (len == 1)
+			width = vis(buf, mbs[0],
+			    VIS_TAB | VIS_NL | VIS_CSTYLE, mbs[1]) - buf;
+		else if ((width = wcwidth(wc)) == -1) {
+			/* U+FFFD replacement character */
+			memcpy(buf, "\357\277\275\0", 4);
+			width = 1;
+		} else {
+			memcpy(buf, mbs, len);
+			buf[len] = '\0';
+		}
+		fputs(buf, stdout);
+		mbs += len;
+	}
+	fputs("\n", stdout);
+}
+
+void
+curwd(pid_t pid)
+{
+	int name[] = { CTL_KERN, KERN_PROC_CWD, pid };
+	char path[PATH_MAX];
+	size_t pathlen = sizeof path;
+
+	if (sysctl(name, 3, path, &pathlen, NULL, 0) != 0)
+		*path = '\0';
+
+	mbswprint(path);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int pid;
+	const char *errstr;
+
+	pledge("stdio ps", NULL);
+
+	if (argc != 2) {
+		printf("usage: getcwd <pid>\n");
+		return(1);
+	}
+
+	pid = strtonum(argv[1], 1, UINT_MAX, &errstr);
+	if (errstr != NULL) {
+		printf("pid is %s: %s\n", errstr, argv[0]);
+		return(1);
+	}
+
+	curwd(pid);
+
+	return 0;
+}