2 * Copyright (C) 1984-2014 Mark Nudelman
4 * You may distribute under the terms of either the GNU General Public
5 * License or the Less License, as specified in the README file.
7 * For more information, see the README file.
11 * Routines to convert text in various ways. Used by search.
20 * Get the length of a buffer needed to convert a string.
29 * Just copying a string in UTF-8 mode can cause it to grow
31 * Four output bytes for one input byte is the worst case.
38 * Allocate a chpos array for use by cvt_text.
45 int *chpos = (int *) ecalloc(sizeof(int), len);
46 /* Initialize all entries to an invalid position. */
47 for (i = 0; i < len; i++)
53 * Convert text. Perform the transformations specified by ops.
54 * Returns converted text in odst. The original offset of each
55 * odst character (when it was in osrc) is returned in the chpos array.
58 cvt_text(odst, osrc, chpos, lenp, ops)
68 register char *src_end;
72 src_end = osrc + *lenp;
74 src_end = osrc + strlen(osrc);
76 for (src = osrc, dst = odst; src < src_end; )
78 int src_pos = src - osrc;
79 int dst_pos = dst - odst;
80 ch = step_char(&src, +1, src_end);
81 if ((ops & CVT_BS) && ch == '\b' && dst > odst)
83 /* Delete backspace and preceding char. */
86 } while (dst > odst &&
87 !IS_ASCII_OCTET(*dst) && !IS_UTF8_LEAD(*dst));
88 } else if ((ops & CVT_ANSI) && IS_CSI_START(ch))
90 /* Skip to end of ANSI escape sequence. */
91 src++; /* skip the CSI start char */
93 if (!is_ansi_middle(*src++))
97 /* Just copy the char to the destination buffer. */
98 if ((ops & CVT_TO_LC) && IS_UPPER(ch))
101 /* Record the original position of the char. */
103 chpos[dst_pos] = src_pos;
108 if ((ops & CVT_CRLF) && edst > odst && edst[-1] == '\r')
113 /* FIXME: why was this here? if (chpos != NULL) chpos[dst - odst] = src - osrc; */