mshow: use fnmatch for extraction

man/mshow.1

@@ -53,15 +53,13 @@ from the message
 .Ar msg
 into files.
 .Ar parts
-can be specified by number or file name.
+can be specified by number, file name or
+.Xr fnmatch 3
+pattern.
 .It Fl O Ar msg
-Switch to extraction mode: extract
-.Ar parts
-from the message
-.Ar msg
-to standard output.
-.Ar parts
-can be specified by number or file name.
+Like
+.Fl x
+but extract to standard output.
 .It Fl t
 Switch to list mode: list all MIME parts
 of each

mshow.c

@@ -4,6 +4,7 @@
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <fnmatch.h>
 #include <iconv.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -402,7 +403,8 @@ extract_mime(int depth, struct message *msg, char *body, size_t bodylen)
 					printf("%s\n", bufptr);
 					writefile(bufptr, body, bodylen);
 				}
-			} else if (filename && strcmp(a, filename) == 0) {
+			} else if (filename &&
+				   fnmatch(a, filename, FNM_PATHNAME) == 0) {
 				// extract by name
 				if (extract_stdout) {
 					fwrite(body, 1, bodylen, stdout);