88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* $NetBSD: strnvisx.c,v 1.1 2016/05/02 19:18:29 christos Exp $ */
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/*-
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* Copyright (c) 1998, 1999, 2004 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum; by Jason R. Thorpe of the Numerical Aerospace
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* Simulation Facility, NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* from scsipiconf.c...
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*/
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#include <lib/libkern/libkern.h>
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#define STRVIS_ISWHITE(x) ((x) == ' ' || (x) == '\0' || (x) == '\377')
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int
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strnvisx(char *dst, size_t dlen, const char *src, size_t slen, int flags)
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{
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if (dlen == 0)
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return -1;
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if (flags & VIS_TRIM) {
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/* Trim leading and trailing blanks and NULs. */
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while (slen > 0 && STRVIS_ISWHITE(src[0]))
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++src, --slen;
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while (slen > 0 && STRVIS_ISWHITE(src[slen - 1]))
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--slen;
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}
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while (slen > 0) {
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if ((flags & VIS_SAFE) && (*src < 0x20 || (*src & 0x80))) {
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/* non-printable characters */
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if (dlen < 4)
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goto out;
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dlen -= 4;
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*dst++ = '\\';
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*dst++ = ((*src & 0300) >> 6) + '0';
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*dst++ = ((*src & 0070) >> 3) + '0';
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*dst++ = ((*src & 0007) >> 0) + '0';
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} else if (*src == '\\') {
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/* quote characters */
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if (dlen < 2)
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goto out;
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dlen -= 2;
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*dst++ = '\\';
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*dst++ = '\\';
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} else {
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/* normal characters */
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if (dlen < 1)
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goto out;
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*dst++ = *src;
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}
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++src, --slen;
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}
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out:
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if (dlen > 0) {
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*dst++ = '\0';
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return slen ? -1 : 0;
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} else {
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*--dst = '\0';
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return -1;
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}
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}
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