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cvt.c
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cvt.c
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/*
* Copyright (C) 1984-2023 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
/*
* Routines to convert text in various ways. Used by search.
*/
#include "less.h"
#include "charset.h"
extern int utf_mode;
/*
* Get the length of a buffer needed to convert a string.
*/
public size_t cvt_length(size_t len, int ops)
{
if (utf_mode)
/*
* Just copying a string in UTF-8 mode can cause it to grow
* in length.
* Four output bytes for one input byte is the worst case.
*/
len *= 4;
return (len + 1);
}
/*
* Allocate a chpos array for use by cvt_text.
*/
public int * cvt_alloc_chpos(size_t len)
{
int i;
int *chpos = (int *) ecalloc(len, sizeof(int));
/* Initialize all entries to an invalid position. */
for (i = 0; i < len; i++)
chpos[i] = -1;
return (chpos);
}
/*
* Convert text. Perform the transformations specified by ops.
* Returns converted text in odst. The original offset of each
* odst character (when it was in osrc) is returned in the chpos array.
*/
public void cvt_text(char *odst, constant char *osrc, int *chpos, size_t *lenp, int ops)
{
char *dst;
char *edst = odst;
constant char *src;
constant char *src_end;
LWCHAR ch;
if (lenp != NULL)
src_end = osrc + *lenp;
else
src_end = osrc + strlen(osrc);
for (src = osrc, dst = odst; src < src_end; )
{
size_t src_pos = ptr_diff(src, osrc);
size_t dst_pos = ptr_diff(dst, odst);
struct ansi_state *pansi;
ch = step_charc(&src, +1, src_end);
if ((ops & CVT_BS) && ch == '\b' && dst > odst)
{
/* Delete backspace and preceding char. */
do {
dst--;
} while (dst > odst && utf_mode &&
!IS_ASCII_OCTET(*dst) && !IS_UTF8_LEAD(*dst));
} else if ((ops & CVT_ANSI) && (pansi = ansi_start(ch)) != NULL)
{
/* Skip to end of ANSI escape sequence. */
while (src < src_end)
{
if (ansi_step(pansi, ch) != ANSI_MID)
break;
ch = *src++;
}
ansi_done(pansi);
} else
{
/* Just copy the char to the destination buffer. */
char *cdst = dst;
if ((ops & CVT_TO_LC) && IS_UPPER(ch))
ch = TO_LOWER(ch);
put_wchar(&dst, ch);
/* Record the original position of the char. */
if (chpos != NULL)
{
while (cdst++ < dst)
chpos[dst_pos++] = (int) src_pos; /*{{type-issue}}*/
}
}
if (dst > edst)
edst = dst;
}
if ((ops & CVT_CRLF) && edst > odst && edst[-1] == '\r')
edst--;
*edst = '\0';
if (lenp != NULL)
*lenp = ptr_diff(edst, odst);
/* FIXME: why was this here? if (chpos != NULL) chpos[dst - odst] = src - osrc; */
}