kernel - Implement RLIMIT_RSS, Increase maximum supported swap
[dragonfly.git] / contrib / less / cvt.c
blobd9836418e13feb775536d2dba523a3ced67314a6
1 /*
2 * Copyright (C) 1984-2015 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.
8 */
11 * Routines to convert text in various ways. Used by search.
14 #include "less.h"
15 #include "charset.h"
17 extern int utf_mode;
20 * Get the length of a buffer needed to convert a string.
22 public int
23 cvt_length(len, ops)
24 int len;
25 int ops;
27 if (utf_mode)
29 * Just copying a string in UTF-8 mode can cause it to grow
30 * in length.
31 * Four output bytes for one input byte is the worst case.
33 len *= 4;
34 return (len + 1);
38 * Allocate a chpos array for use by cvt_text.
40 public int *
41 cvt_alloc_chpos(len)
42 int len;
44 int i;
45 int *chpos = (int *) ecalloc(sizeof(int), len);
46 /* Initialize all entries to an invalid position. */
47 for (i = 0; i < len; i++)
48 chpos[i] = -1;
49 return (chpos);
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.
57 public void
58 cvt_text(odst, osrc, chpos, lenp, ops)
59 char *odst;
60 char *osrc;
61 int *chpos;
62 int *lenp;
63 int ops;
65 char *dst;
66 char *edst = odst;
67 char *src;
68 register char *src_end;
69 LWCHAR ch;
71 if (lenp != NULL)
72 src_end = osrc + *lenp;
73 else
74 src_end = osrc + strlen(osrc);
76 for (src = osrc, dst = odst; src < src_end; )
78 int src_pos = (int) (src - osrc);
79 int dst_pos = (int) (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. */
84 do {
85 dst--;
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 */
92 while (src < src_end)
93 if (!is_ansi_middle(*src++))
94 break;
95 } else
97 /* Just copy the char to the destination buffer. */
98 if ((ops & CVT_TO_LC) && IS_UPPER(ch))
99 ch = TO_LOWER(ch);
100 put_wchar(&dst, ch);
101 /* Record the original position of the char. */
102 if (chpos != NULL)
103 chpos[dst_pos] = src_pos;
105 if (dst > edst)
106 edst = dst;
108 if ((ops & CVT_CRLF) && edst > odst && edst[-1] == '\r')
109 edst--;
110 *edst = '\0';
111 if (lenp != NULL)
112 *lenp = (int) (edst - odst);
113 /* FIXME: why was this here? if (chpos != NULL) chpos[dst - odst] = src - osrc; */