add mkdir

Makefile

@@ -2,7 +2,7 @@ include config.mk
 
 LIB = util/afgets.o util/agetcwd.o util/enmasse.o util/eprintf.o util/recurse.o
 SRC = basename.c cat.c chown.c date.c dirname.c echo.c false.c grep.c head.c \
-      ln.c ls.c mkfifo.c pwd.c rm.c sleep.c tee.c touch.c true.c wc.c
+      ln.c ls.c mkdir.c mkfifo.c pwd.c rm.c sleep.c tee.c touch.c true.c wc.c
 OBJ = $(SRC:.c=.o) $(LIB)
 BIN = $(SRC:.c=)
 MAN = $(SRC:.c=.1)

mkdir.1

@@ -0,0 +1,17 @@
+.TH MKDIR 1 sbase\-VERSION
+.SH NAME
+mkdir \- make directory
+.SH SYNOPSIS
+.B mkdir
+.RB [ \-p ]
+.RI [ name ...]
+.SH DESCRIPTION
+.B mkdir
+creates the specified directories.
+.SH OPTIONS
+.TP
+.B \-p
+creates any necessary parent directories, and does not fail if the target
+already exists.
+.SH SEE ALSO
+.IR mkdir (2)

mkdir.c

@@ -0,0 +1,48 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include "util.h"
+
+static void mkdirp(char *);
+
+int
+main(int argc, char *argv[])
+{
+	bool pflag = false;
+	char c;
+
+	while((c = getopt(argc, argv, "p")) != -1)
+		switch(c) {
+		case 'p':
+			pflag = true;
+			break;
+		default:
+			exit(EXIT_FAILURE);
+		}
+	for(; optind < argc; optind++)
+		if(pflag)
+			mkdirp(argv[optind]);
+		else if(mkdir(argv[optind], S_IRWXU|S_IRWXG|S_IRWXO) != 0)
+			eprintf("mkdir %s:", argv[optind]);
+	return EXIT_SUCCESS;
+}
+
+void
+mkdirp(char *path)
+{
+	char *p = path;
+
+	do {
+		if((p = strchr(&p[1], '/')))
+			*p = '\0';
+		if(mkdir(path, S_IRWXU|S_IRWXG|S_IRWXO) != 0 && errno != EEXIST)
+			eprintf("mkdir %s:", path);
+		if(p)
+			*p = '/';
+	} while(p);
+}

pwd.c

@@ -1,7 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
 #include "util.h"
 
 int

touch.1

@@ -1,6 +1,6 @@
 .TH TOUCH 1 sbase\-VERSION
 .SH NAME
-touch \- set files' modification time
+touch \- set files' timestamps
 .SH SYNOPSIS
 .B touch
 .RB [ \-c ]
@@ -9,8 +9,8 @@ touch \- set files' modification time
 .RI [ file ...]
 .SH DESCRIPTION
 .B touch
-sets the files' modification time to the current time.  If a file does not exist
+sets the given files' modification time to the current time.  If a file does not
-it is created.
+exist it is created.
 .SH OPTIONS
 .TP
 .B \-c