[syslinux:master] cat.c32: check if filename exists

[syslinux-bot for Gert Hulselmans]

Commit-ID:  4d6d5f91c3e6c69dc22cd51225f1a3e87fa19468
Gitweb:     http://syslinux.zytor.com/commit/4d6d5f91c3e6c69dc22cd51225f1a3e87fa19468
Author:     Gert Hulselmans <gerth at zytor.com>
AuthorDate: Mon, 3 May 2010 17:07:43 -0700
Committer:  H. Peter Anvin <hpa at zytor.com>
CommitDate: Tue, 11 May 2010 16:06:56 -0700

cat.c32: check if filename exists

Don't crash if the file doesn't exist.

Signed-off-by: Gert Hulselmans <gerth at zytor.com>
Signed-off-by: H. Peter Anvin <hpa at zytor.com>


---
 com32/samples/cat.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/com32/samples/cat.c b/com32/samples/cat.c
index 16380b0..3930f74 100644
--- a/com32/samples/cat.c
+++ b/com32/samples/cat.c
@@ -15,13 +15,18 @@ int main(int argc, char *argv[])
 	printf("argv[%d] = %p = \"%s\"\n", i, argv[i], argv[i]);
 
     if (argc < 2) {
-	fprintf(stderr, "Missing file name!\n");
-	exit(1);
+	fprintf(stderr, "Usage: cat.c32 filename\n");
+	return 1;
     }
 
     printf("File = %s\n", argv[1]);
 
     f = fopen(argv[1], "r");
+    if (!f) {
+	fprintf(stderr, "File name \"%s\" does not exist.\n", argv[1]);
+	return 1;
+    }
+
     while ((ch = getc(f)) != EOF)
 	putchar(ch);