| fmtcheck.3 (105205) | fmtcheck.3 (108087) |
|---|---|
| 1.\" Copyright (c) 2000 The NetBSD Foundation, Inc. 2.\" All rights reserved. 3.\" 4.\" This file was contributed to The NetBSD Foundation by Allen Briggs. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: --- 17 unchanged lines hidden (view full) --- 26.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32.\" POSSIBILITY OF SUCH DAMAGE. 33.\" | 1.\" Copyright (c) 2000 The NetBSD Foundation, Inc. 2.\" All rights reserved. 3.\" 4.\" This file was contributed to The NetBSD Foundation by Allen Briggs. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: --- 17 unchanged lines hidden (view full) --- 26.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32.\" POSSIBILITY OF SUCH DAMAGE. 33.\" |
| 34.\" $FreeBSD: head/lib/libc/gen/fmtcheck.3 105205 2002-10-16 04:03:02Z tjr $ | 34.\" $FreeBSD: head/lib/libc/gen/fmtcheck.3 108087 2002-12-19 09:40:28Z ru $ |
| 35.Dd October 16, 2002 36.Os 37.Dt FMTCHECK 3 38.Sh NAME 39.Nm fmtcheck 40.Nd sanitizes user-supplied 41.Xr printf 3 Ns -style 42format string --- 19 unchanged lines hidden (view full) --- 62is a valid format string. 63.Pp 64The 65.Xr printf 3 66family of functions cannot verify the types of arguments that they are 67passed at run-time. In some cases, like 68.Xr catgets 3 , 69it is useful or necessary to use a user-supplied format string with no | 35.Dd October 16, 2002 36.Os 37.Dt FMTCHECK 3 38.Sh NAME 39.Nm fmtcheck 40.Nd sanitizes user-supplied 41.Xr printf 3 Ns -style 42format string --- 19 unchanged lines hidden (view full) --- 62is a valid format string. 63.Pp 64The 65.Xr printf 3 66family of functions cannot verify the types of arguments that they are 67passed at run-time. In some cases, like 68.Xr catgets 3 , 69it is useful or necessary to use a user-supplied format string with no |
| 70guarantee that the format string matches the specified parameters. | 70guarantee that the format string matches the specified arguments. |
| 71.Pp 72The 73.Fn fmtcheck 74was designed to be used in these cases, as in: 75.Bd -literal -offset indent 76printf(fmtcheck(user_format, standard_format), arg1, arg2); 77.Ed 78.Pp --- 10 unchanged lines hidden (view full) --- 89then the 90.Fn fmtcheck 91will return 92.Fa fmt_suspect . 93Otherwise, it will return 94.Fa fmt_default . 95.Sh SECURITY CONSIDERATIONS 96Note that the formats may be quite different as long as they accept the | 71.Pp 72The 73.Fn fmtcheck 74was designed to be used in these cases, as in: 75.Bd -literal -offset indent 76printf(fmtcheck(user_format, standard_format), arg1, arg2); 77.Ed 78.Pp --- 10 unchanged lines hidden (view full) --- 89then the 90.Fn fmtcheck 91will return 92.Fa fmt_suspect . 93Otherwise, it will return 94.Fa fmt_default . 95.Sh SECURITY CONSIDERATIONS 96Note that the formats may be quite different as long as they accept the |
| 97same parameters. For example, | 97same arguments. For example, |
| 98.Qq Li "%p %o %30s %#llx %-10.*e %n" 99is compatible with 100.Qq Li "This number %lu %d%% and string %s has %qd numbers and %.*g floats (%n)" . 101However, 102.Qq Li %o 103is not equivalent to 104.Qq Li %lx 105because 106the first requires an integer and the second requires a long. 107.Sh SEE ALSO 108.Xr printf 3 109.Sh BUGS 110The 111.Fn fmtcheck 112function does not understand all of the conversions that 113.Xr printf 3 114does. | 98.Qq Li "%p %o %30s %#llx %-10.*e %n" 99is compatible with 100.Qq Li "This number %lu %d%% and string %s has %qd numbers and %.*g floats (%n)" . 101However, 102.Qq Li %o 103is not equivalent to 104.Qq Li %lx 105because 106the first requires an integer and the second requires a long. 107.Sh SEE ALSO 108.Xr printf 3 109.Sh BUGS 110The 111.Fn fmtcheck 112function does not understand all of the conversions that 113.Xr printf 3 114does. |