lbbs/src/str_process.c

/***************************************************************************
                                                  str_process.c  -  description
                                                         -------------------
        Copyright            : (C) 2004-2025 by Leaflet
        Email                : leaflet@leafok.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "common.h"
#include "log.h"
#include "str_process.h"
#include <stdio.h>
#include <string.h>

int str_length(const char *str, int skip_ctrl_seq)
{
        int i;
        char c;
        int ret = 0;

        for (i = 0; str[i] != '\0'; i++)
        {
                c = str[i];

                if (c == '\r' || c == '\7') // skip
                {
                        continue;
                }

                if (skip_ctrl_seq && c == '\033' && str[i + 1] == '[') // Skip control sequence
                {
                        i += 2;
                        while (str[i] != '\0' && str[i] != 'm')
                        {
                                i++;
                        }
                        continue;
                }

                // Process UTF-8 Chinese characters
                if (c & 0x80) // head of multi-byte character
                {
                        c = (c & 0x70) << 1;
                        while (c & 0x80)
                        {
                                i++;
                                c = (c & 0x7f) << 1;
                        }

                        ret += 2;
                }
                else
                {
                        ret++;
                }
        }

        return ret;
}

int split_line(const char *buffer, int max_display_len, int *p_eol, int *p_display_len, int skip_ctrl_seq)
{
        int i;
        *p_eol = 0;
        *p_display_len = 0;
        char c;

        for (i = 0; buffer[i] != '\0'; i++)
        {
                c = buffer[i];

                if (c == '\r' || c == '\7') // skip
                {
                        continue;
                }

                if (skip_ctrl_seq && c == '\033' && buffer[i + 1] == '[') // Skip control sequence
                {
                        i += 2;
                        while (buffer[i] != '\0' && buffer[i] != 'm')
                        {
                                i++;
                        }
                        continue;
                }

                if (c & 0x80) // head of multi-byte character
                {
                        if (*p_display_len + 2 > max_display_len)
                        {
                                break;
                        }

                        c = (c & 0x70) << 1;
                        while (c & 0x80)
                        {
                                i++;
                                c = (c & 0x7f) << 1;
                        }

                        (*p_display_len) += 2;
                }
                else
                {
                        if (*p_display_len + 1 > max_display_len)
                        {
                                break;
                        }
                        (*p_display_len)++;

                        // \n is regarded as 1 character wide in terminal editor, which is different from Web version
                        if (c == '\n')
                        {
                                i++;
                                *p_eol = 1;
                                break;
                        }
                }
        }

        return i;
}

long split_data_lines(const char *p_buf, int max_display_len, long *p_line_offsets, long line_offsets_count,
                                          int skip_ctrl_seq, int *p_line_widths)
{
        int line_cnt = 0;
        int len;
        int end_of_line = 0;
        int display_len = 0;

        p_line_offsets[line_cnt] = 0L;

        do
        {
                len = split_line(p_buf, max_display_len, &end_of_line, &display_len, skip_ctrl_seq);

                if (p_line_widths)
                {
                        p_line_widths[line_cnt] = display_len;
                }

                // Exceed max_line_cnt
                if (line_cnt + 1 >= line_offsets_count)
                {
                        // log_error("Line count %d reaches limit %d\n", line_cnt + 1, line_offsets_count);
                        return line_cnt;
                }

                p_line_offsets[line_cnt + 1] = p_line_offsets[line_cnt] + len;
                line_cnt++;
                p_buf += len;
        } while (p_buf[0] != '\0');

        return line_cnt;
}

int str_filter(char *buffer, int skip_ctrl_seq)
{
        int i;
        int j;

        for (i = 0, j = 0; buffer[i] != '\0'; i++)
        {
                if (buffer[i] == '\r' || buffer[i] == '\7') // skip
                {
                        continue;
                }

                if (skip_ctrl_seq && buffer[i] == '\033' && buffer[i + 1] == '[') // Skip control sequence
                {
                        i += 2;
                        while (buffer[i] != '\0' && buffer[i] != 'm')
                        {
                                i++;
                        }
                        continue;
                }

                buffer[j] = buffer[i];
                j++;
        }

        buffer[j] = '\0';

        return j;
}
1	/***************************************************************************
2	str_process.c - description
3	-------------------
4	Copyright : (C) 2004-2025 by Leaflet
5	Email : leaflet@leafok.com
6	***************************************************************************/
7
8	/***************************************************************************
9	* *
10	* This program is free software; you can redistribute it and/or modify *
11	* it under the terms of the GNU General Public License as published by *
12	* the Free Software Foundation; either version 3 of the License, or *
13	* (at your option) any later version. *
14	* *
15	***************************************************************************/
16
17	#include "common.h"
18	#include "log.h"
19	#include "str_process.h"
20	#include <stdio.h>
21	#include <string.h>
22
23	int str_length(const char *str, int skip_ctrl_seq)
24	{
25	int i;
26	char c;
27	int ret = 0;
28
29	for (i = 0; str[i] != '\0'; i++)
30	{
31	c = str[i];
32
33	if (c == '\r' \|\| c == '\7') // skip
34	{
35	continue;
36	}
37
38	if (skip_ctrl_seq && c == '\033' && str[i + 1] == '[') // Skip control sequence
39	{
40	i += 2;
41	while (str[i] != '\0' && str[i] != 'm')
42	{
43	i++;
44	}
45	continue;
46	}
47
48	// Process UTF-8 Chinese characters
49	if (c & 0x80) // head of multi-byte character
50	{
51	c = (c & 0x70) << 1;
52	while (c & 0x80)
53	{
54	i++;
55	c = (c & 0x7f) << 1;
56	}
57
58	ret += 2;
59	}
60	else
61	{
62	ret++;
63	}
64	}
65
66	return ret;
67	}
68
69	int split_line(const char buffer, int max_display_len, int p_eol, int *p_display_len, int skip_ctrl_seq)
70	{
71	int i;
72	*p_eol = 0;
73	*p_display_len = 0;
74	char c;
75
76	for (i = 0; buffer[i] != '\0'; i++)
77	{
78	c = buffer[i];
79
80	if (c == '\r' \|\| c == '\7') // skip
81	{
82	continue;
83	}
84
85	if (skip_ctrl_seq && c == '\033' && buffer[i + 1] == '[') // Skip control sequence
86	{
87	i += 2;
88	while (buffer[i] != '\0' && buffer[i] != 'm')
89	{
90	i++;
91	}
92	continue;
93	}
94
95	if (c & 0x80) // head of multi-byte character
96	{
97	if (*p_display_len + 2 > max_display_len)
98	{
99	break;
100	}
101
102	c = (c & 0x70) << 1;
103	while (c & 0x80)
104	{
105	i++;
106	c = (c & 0x7f) << 1;
107	}
108
109	(*p_display_len) += 2;
110	}
111	else
112	{
113	if (*p_display_len + 1 > max_display_len)
114	{
115	break;
116	}
117	(*p_display_len)++;
118
119	// \n is regarded as 1 character wide in terminal editor, which is different from Web version
120	if (c == '\n')
121	{
122	i++;
123	*p_eol = 1;
124	break;
125	}
126	}
127	}
128
129	return i;
130	}
131
132	long split_data_lines(const char p_buf, int max_display_len, long p_line_offsets, long line_offsets_count,
133	int skip_ctrl_seq, int *p_line_widths)
134	{
135	int line_cnt = 0;
136	int len;
137	int end_of_line = 0;
138	int display_len = 0;
139
140	p_line_offsets[line_cnt] = 0L;
141
142	do
143	{
144	len = split_line(p_buf, max_display_len, &end_of_line, &display_len, skip_ctrl_seq);
145
146	if (p_line_widths)
147	{
148	p_line_widths[line_cnt] = display_len;
149	}
150
151	// Exceed max_line_cnt
152	if (line_cnt + 1 >= line_offsets_count)
153	{
154	// log_error("Line count %d reaches limit %d\n", line_cnt + 1, line_offsets_count);
155	return line_cnt;
156	}
157
158	p_line_offsets[line_cnt + 1] = p_line_offsets[line_cnt] + len;
159	line_cnt++;
160	p_buf += len;
161	} while (p_buf[0] != '\0');
162
163	return line_cnt;
164	}
165
166	int str_filter(char *buffer, int skip_ctrl_seq)
167	{
168	int i;
169	int j;
170
171	for (i = 0, j = 0; buffer[i] != '\0'; i++)
172	{
173	if (buffer[i] == '\r' \|\| buffer[i] == '\7') // skip
174	{
175	continue;
176	}
177
178	if (skip_ctrl_seq && buffer[i] == '\033' && buffer[i + 1] == '[') // Skip control sequence
179	{
180	i += 2;
181	while (buffer[i] != '\0' && buffer[i] != 'm')
182	{
183	i++;
184	}
185	continue;
186	}
187
188	buffer[j] = buffer[i];
189	j++;
190	}
191
192	buffer[j] = '\0';
193
194	return j;
195	}
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