diff options
| author | Thorsten Lockert <tholo@cvs.openbsd.org> | 1996-10-28 05:32:56 +0000 |
|---|---|---|
| committer | Thorsten Lockert <tholo@cvs.openbsd.org> | 1996-10-28 05:32:56 +0000 |
| commit | 22e7043adb0bc1aba7f6fd174346f76192f0b5f1 (patch) | |
| tree | d63c29957244bbb9d5ca680e30acda4eac1e25b2 /lib | |
| parent | fafff148e10ab137d6494753a47905a2262a870d (diff) | |
Verify that file pointer is writable
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc/stdio/fputc.c | 8 | ||||
| -rw-r--r-- | lib/libc/stdio/putc.c | 8 |
2 files changed, 14 insertions, 2 deletions
diff --git a/lib/libc/stdio/fputc.c b/lib/libc/stdio/fputc.c index b7630b1a3a1..ed6c256f5c9 100644 --- a/lib/libc/stdio/fputc.c +++ b/lib/libc/stdio/fputc.c @@ -35,14 +35,20 @@ */ #if defined(LIBC_SCCS) && !defined(lint) -static char rcsid[] = "$OpenBSD: fputc.c,v 1.2 1996/08/19 08:32:42 tholo Exp $"; +static char rcsid[] = "$OpenBSD: fputc.c,v 1.3 1996/10/28 05:32:54 tholo Exp $"; #endif /* LIBC_SCCS and not lint */ #include <stdio.h> +#include <errno.h> +#include "local.h" fputc(c, fp) int c; register FILE *fp; { + if (cantwrite(fp)) { + errno = EBADF; + return (EOF); + } return (putc(c, fp)); } diff --git a/lib/libc/stdio/putc.c b/lib/libc/stdio/putc.c index db1edd14bd0..b43af508a55 100644 --- a/lib/libc/stdio/putc.c +++ b/lib/libc/stdio/putc.c @@ -35,10 +35,12 @@ */ #if defined(LIBC_SCCS) && !defined(lint) -static char rcsid[] = "$OpenBSD: putc.c,v 1.2 1996/08/19 08:32:58 tholo Exp $"; +static char rcsid[] = "$OpenBSD: putc.c,v 1.3 1996/10/28 05:32:55 tholo Exp $"; #endif /* LIBC_SCCS and not lint */ #include <stdio.h> +#include <errno.h> +#include "local.h" /* * A subroutine version of the macro putc. @@ -49,5 +51,9 @@ putc(c, fp) int c; register FILE *fp; { + if (cantwrite(fp)) { + errno = EBADF; + return (EOF); + } return (__sputc(c, fp)); } |