121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
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/*
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* Copyright (C) 1984-2009 Mark Nudelman
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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 about less, or for information on how to
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* contact the author, 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 "less.h"
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#include "charset.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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public int
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cvt_length(len, ops)
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int len;
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int ops;
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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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public int *
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cvt_alloc_chpos(len)
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int len;
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{
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int i;
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int *chpos = (int *) 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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public void
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cvt_text(odst, osrc, chpos, lenp, ops)
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char *odst;
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char *osrc;
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int *chpos;
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int *lenp;
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int ops;
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{
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char *dst;
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char *src;
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register 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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{
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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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{
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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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{
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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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{
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/* Just copy the char to the destination buffer. */
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if ((ops & CVT_TO_LC) && IS_UPPER(ch))
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ch = TO_LOWER(ch);
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put_wchar(&dst, ch);
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/*
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* Record the original position of the char.
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* But if we've already recorded a position
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* for this char (due to a backspace), leave
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* it alone; if multiple source chars map to
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* one destination char, we want the position
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* of the first one.
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*/
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if (chpos != NULL && chpos[dst_pos] < 0)
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chpos[dst_pos] = src_pos;
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}
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}
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if ((ops & CVT_CRLF) && dst > odst && dst[-1] == '\r')
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dst--;
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*dst = '\0';
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if (lenp != NULL)
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*lenp = dst - odst;
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if (chpos != NULL)
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chpos[dst - odst] = src - osrc;
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}
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