GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/less/less/../cvt.c Lines: 28 38 73.7 %
Date: 2017-11-13 Branches: 17 44 38.6 %

Line Branch Exec Source
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/*
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 * Copyright (C) 1984-2012  Mark Nudelman
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 * Modified for use with illumos by Garrett D'Amore.
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 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
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 *
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 * You may distribute under the terms of either the GNU General Public
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 * License or the Less License, as specified in the README file.
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 *
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 * For more information, see the README file.
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 */
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/*
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 * Routines to convert text in various ways.  Used by search.
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 */
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#include "charset.h"
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#include "less.h"
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extern int utf_mode;
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/*
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 * Get the length of a buffer needed to convert a string.
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 */
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int
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cvt_length(int len)
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{
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	if (utf_mode)
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		/*
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		 * Just copying a string in UTF-8 mode can cause it to grow
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		 * in length.
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		 * Four output bytes for one input byte is the worst case.
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		 */
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		len *= 4;
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	return (len + 1);
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}
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/*
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 * Allocate a chpos array for use by cvt_text.
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 */
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int *
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cvt_alloc_chpos(int len)
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{
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	int i;
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	int *chpos = ecalloc(sizeof (int), len);
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	/* Initialize all entries to an invalid position. */
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	for (i = 0; i < len; i++)
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		chpos[i] = -1;
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	return (chpos);
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}
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/*
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 * Convert text.  Perform the transformations specified by ops.
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 * Returns converted text in odst.  The original offset of each
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 * odst character (when it was in osrc) is returned in the chpos array.
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 */
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void
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cvt_text(char *odst, char *osrc, int *chpos, int *lenp, int ops)
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{
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	char *dst;
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	char *edst = odst;
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	char *src;
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	char *src_end;
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	LWCHAR ch;
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	if (lenp != NULL)
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		src_end = osrc + *lenp;
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	else
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		src_end = osrc + strlen(osrc);
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	for (src = osrc, dst = odst; src < src_end; ) {
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		int src_pos = src - osrc;
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		int dst_pos = dst - odst;
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		ch = step_char(&src, +1, src_end);
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		if ((ops & CVT_BS) && ch == '\b' && dst > odst) {
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			/* Delete backspace and preceding char. */
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			do {
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				dst--;
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			} while (dst > odst &&
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			    !IS_ASCII_OCTET(*dst) && !IS_UTF8_LEAD(*dst));
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		} else if ((ops & CVT_ANSI) && IS_CSI_START(ch)) {
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			/* Skip to end of ANSI escape sequence. */
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			src++;	/* skip the CSI start char */
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			while (src < src_end)
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				if (!is_ansi_middle(*src++))
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					break;
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		} else {
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			/* Just copy the char to the destination buffer. */
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			if ((ops & CVT_TO_LC) && iswupper(ch))
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				ch = towlower(ch);
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			put_wchar(&dst, ch);
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			/* Record the original position of the char. */
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			if (chpos != NULL)
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				chpos[dst_pos] = src_pos;
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		}
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		if (dst > edst)
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			edst = dst;
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	}
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	if ((ops & CVT_CRLF) && edst > odst && edst[-1] == '\r')
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		edst--;
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	*edst = '\0';
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	if (lenp != NULL)
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		*lenp = edst - odst;
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}