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/*++
/* NAME
/* printable 3
/* SUMMARY
/* mask non-printable characters
/* SYNOPSIS
/* #include <stringops.h>
/*
/* int util_utf8_enable;
/*
/* char *printable(buffer, replacement)
/* char *buffer;
/* int replacement;
/*
/* char *printable_except(buffer, replacement, except)
/* char *buffer;
/* int replacement;
/* const char *except;
/* DESCRIPTION
/* printable() replaces non-printable characters
/* in its input with the given replacement.
/*
/* util_utf8_enable controls whether UTF8 is considered printable.
/* With util_utf8_enable equal to zero, non-ASCII text is replaced.
/*
/* Arguments:
/* .IP buffer
/* The null-terminated input string.
/* .IP replacement
/* Replacement value for characters in \fIbuffer\fR that do not
/* pass the ASCII isprint(3) test or that are not valid UTF8.
/* .IP except
/* Null-terminated sequence of non-replaced ASCII characters.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/* System library. */
#include "sys_defs.h"
#include <ctype.h>
#include <string.h>
/* Utility library. */
#include "stringops.h"
int util_utf8_enable = 0;
/* printable - binary compatibility */
#undef printable
char *printable(char *, int);
char *printable(char *string, int replacement)
{
return (printable_except(string, replacement, (char *) 0));
}
/* printable_except - pass through printable or other preserved characters */
char *printable_except(char *string, int replacement, const char *except)
{
unsigned char *cp;
int ch;
/*
* XXX Replace invalid UTF8 sequences (too short, over-long encodings,
* out-of-range code points, etc). See valid_utf8_string.c.
*/
cp = (unsigned char *) string;
while ((ch = *cp) != 0) {
if (ISASCII(ch) && (ISPRINT(ch) || (except && strchr(except, ch)))) {
/* ok */
} else if (util_utf8_enable && ch >= 194 && ch <= 254
&& cp[1] >= 128 && cp[1] < 192) {
/* UTF8; skip the rest of the bytes in the character. */
while (cp[1] >= 128 && cp[1] < 192)
cp++;
} else {
/* Not ASCII and not UTF8. */
*cp = replacement;
}
cp++;
}
return (string);
}
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