05-29-2018
Try adding an \n to printf's format string.
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LEARN ABOUT MOJAVE
fmtcheck
FMTCHECK(3) BSD Library Functions Manual FMTCHECK(3)
NAME
fmtcheck -- sanitizes user-supplied printf(3)-style format string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdio.h>
const char *
fmtcheck(const char *fmt_suspect, const char *fmt_default);
DESCRIPTION
The fmtcheck() scans fmt_suspect and fmt_default to determine if fmt_suspect will consume the same argument types as fmt_default and to
ensure that fmt_suspect is a valid format string.
The printf(3) family of functions cannot verify the types of arguments that they are passed at run-time. In some cases, like catgets(3), it
is useful or necessary to use a user-supplied format string with no guarantee that the format string matches the specified arguments.
The fmtcheck() was designed to be used in these cases, as in:
printf(fmtcheck(user_format, standard_format), arg1, arg2);
In the check, field widths, fillers, precisions, etc. are ignored (unless the field width or precision is an asterisk '*' instead of a digit
string). Also, any text other than the format specifiers is completely ignored.
RETURN VALUES
If fmt_suspect is a valid format and consumes the same argument types as fmt_default, then the fmtcheck() will return fmt_suspect. Other-
wise, it will return fmt_default.
SECURITY CONSIDERATIONS
Note that the formats may be quite different as long as they accept the same arguments. For example, "%p %o %30s %#llx %-10.*e %n" is com-
patible with "This number %lu %d%% and string %s has %qd numbers and %.*g floats (%n)". However, "%o" is not equivalent to "%lx" because the
first requires an integer and the second requires a long.
SEE ALSO
printf(3)
BUGS
The fmtcheck() function does not recognize positional parameters.
BSD
October 16, 2002 BSD