Support - to read from stdin, from Sebastien Marie.

diff --git a/usr.bin/file/file.1 b/usr.bin/file/file.1
index 24eaa05..3f2644e 100644 (file)
--- a/usr.bin/file/file.1
+++ b/usr.bin/file/file.1
@@ -1,4 +1,4 @@
-.\" $OpenBSD: file.1,v 1.41 2015/04/27 11:12:49 jmc Exp $
+.\" $OpenBSD: file.1,v 1.42 2015/05/30 06:25:35 nicm Exp $
 .\" $FreeBSD: src/usr.bin/file/file.1,v 1.16 2000/03/01 12:19:39 sheldonh Exp $
 .\"
 .\" Copyright (c) 2015 Nicholas Marriott <nicm@openbsd.org>
@@ -28,7 +28,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: April 27 2015 $
+.Dd $Mdocdate: May 30 2015 $
 .Dt FILE 1
 .Os
 .Sh NAME
@@ -74,6 +74,13 @@ or
 .Em data
 meaning anything else.
 .Pp
+If
+.Ar file
+is a single dash
+.Pq Sq - ,
+.Nm
+reads from the standard input.
+.Pp
 The options are as follows:
 .Bl -tag -width indent
 .It Fl b

diff --git a/usr.bin/file/file.c b/usr.bin/file/file.c
index 81294d8..ba0c3df 100644 (file)
--- a/usr.bin/file/file.c
+++ b/usr.bin/file/file.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: file.c,v 1.44 2015/05/29 15:58:34 nicm Exp $ */
+/* $OpenBSD: file.c,v 1.45 2015/05/30 06:25:35 nicm Exp $ */
 
 /*
  * Copyright (c) 2015 Nicholas Marriott <nicm@openbsd.org>
@@ -209,7 +209,13 @@ main(int argc, char **argv)
                memset(&msg, 0, sizeof msg);
                msg.idx = idx;
 
-               if (lstat(argv[idx], &msg.sb) == -1) {
+               if (strcmp(argv[idx], "-") == 0) {
+                       if (fstat(STDIN_FILENO, &msg.sb) == -1) {
+                               fd = -1;
+                               msg.error = errno;
+                       } else
+                               fd = STDIN_FILENO;
+               } else if (lstat(argv[idx], &msg.sb) == -1) {
                        fd = -1;
                        msg.error = errno;
                } else {
@@ -441,8 +447,11 @@ try_stat(struct input_file *inf)
                    strerror(inf->msg->error));
                return (1);
        }
-       if (sflag) {
+       if (sflag || strcmp(inf->path, "-") == 0) {
                switch (inf->msg->sb.st_mode & S_IFMT) {
+               case S_IFIFO:
+                       if (strcmp(inf->path, "-") != 0)
+                               break;
                case S_IFBLK:
                case S_IFCHR:
                case S_IFREG:
@@ -617,7 +626,10 @@ test_file(struct input_file *inf, size_t width)
        if (bflag)
                printf("%s\n", inf->result);
        else {
-               xasprintf(&label, "%s:", inf->path);
+               if (strcmp(inf->path, "-") == 0)
+                       xasprintf(&label, "/dev/stdin:");
+               else
+                       xasprintf(&label, "%s:", inf->path);
                printf("%-*s %s\n", (int)width, label, inf->result);
                free(label);
        }