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      1 /*	$NetBSD: strnvisx.c,v 1.1 2016/05/02 19:18:29 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998, 1999, 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Charles M. Hannum; by Jason R. Thorpe of the Numerical Aerospace
      9  * Simulation Facility, NASA Ames Research Center.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * from scsipiconf.c...
     35  */
     36 #include <lib/libkern/libkern.h>
     37 
     38 #define	STRVIS_ISWHITE(x) ((x) == ' ' || (x) == '\0' || (x) == '\377')
     39 
     40 int
     41 strnvisx(char *dst, size_t dlen, const char *src, size_t slen, int flags)
     42 {
     43 	if (dlen == 0)
     44 		return -1;
     45 
     46 	if (flags & VIS_TRIM) {
     47 		/* Trim leading and trailing blanks and NULs. */
     48 		while (slen > 0 && STRVIS_ISWHITE(src[0]))
     49 			++src, --slen;
     50 		while (slen > 0 && STRVIS_ISWHITE(src[slen - 1]))
     51 			--slen;
     52 	}
     53 
     54 	while (slen > 0) {
     55 		if ((flags & VIS_SAFE) && (*src < 0x20 || (*src & 0x80))) {
     56 			/* non-printable characters */
     57 			if (dlen < 4)
     58 				goto out;
     59 			dlen -= 4;
     60 			*dst++ = '\\';
     61 			*dst++ = ((*src & 0300) >> 6) + '0';
     62 			*dst++ = ((*src & 0070) >> 3) + '0';
     63 			*dst++ = ((*src & 0007) >> 0) + '0';
     64 		} else if (*src == '\\') {
     65 			/* quote characters */
     66 			if (dlen < 2)
     67 				goto out;
     68 			dlen -= 2;
     69 			*dst++ = '\\';
     70 			*dst++ = '\\';
     71 		} else {
     72 			/* normal characters */
     73 			if (dlen < 1)
     74 				goto out;
     75 			*dst++ = *src;
     76 		}
     77 		++src, --slen;
     78 	}
     79 out:
     80 	if (dlen > 0) {
     81 		*dst++ = '\0';
     82 		return slen ? -1 : 0;
     83 	} else {
     84 		*--dst = '\0';
     85 		return -1;
     86 	}
     87 }
     88