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	sysadm	1.1	/***************************************************************************
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	sysadm	1.3	* the Free Software Foundation; either version 3 of the License, or *
13	sysadm	1.1	* (at your option) any later version. *
14			* *
15			***************************************************************************/
16
17			#include "common.h"
18			#include "log.h"
19	sysadm	1.18	#include "str_process.h"
20	sysadm	1.1	#include <stdio.h>
21			#include <string.h>
22
23	sysadm	1.20	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	sysadm	1.21	if (c & 0x80) // head of multi-byte character
50	sysadm	1.20	{
51	sysadm	1.21	c = (c & 0x70) << 1;
52			while (c & 0x80)
53	sysadm	1.20	{
54			i++;
55	sysadm	1.21	c = (c & 0x7f) << 1;
56	sysadm	1.20	}
57
58			ret += 2;
59			}
60			else
61			{
62			ret++;
63			}
64			}
65
66			return ret;
67			}
68
69	sysadm	1.17	int split_line(const char buffer, int max_display_len, int p_eol, int *p_display_len, int skip_ctrl_seq)
70	sysadm	1.1	{
71	sysadm	1.7	int i;
72	sysadm	1.1	*p_eol = 0;
73	sysadm	1.4	*p_display_len = 0;
74	sysadm	1.11	char c;
75	sysadm	1.1
76	sysadm	1.7	for (i = 0; buffer[i] != '\0'; i++)
77	sysadm	1.1	{
78	sysadm	1.11	c = buffer[i];
79	sysadm	1.1
80			if (c == '\r' \|\| c == '\7') // skip
81			{
82			continue;
83			}
84
85	sysadm	1.17	if (skip_ctrl_seq && c == '\033' && buffer[i + 1] == '[') // Skip control sequence
86	sysadm	1.1	{
87			i += 2;
88	sysadm	1.7	while (buffer[i] != '\0' && buffer[i] != 'm')
89	sysadm	1.1	{
90			i++;
91			}
92			continue;
93			}
94
95	sysadm	1.21	if (c & 0x80) // head of multi-byte character
96	sysadm	1.1	{
97	sysadm	1.6	if (*p_display_len + 2 > max_display_len)
98	sysadm	1.1	{
99			break;
100			}
101	sysadm	1.20
102	sysadm	1.21	c = (c & 0x70) << 1;
103			while (c & 0x80)
104	sysadm	1.20	{
105			i++;
106	sysadm	1.21	c = (c & 0x7f) << 1;
107	sysadm	1.20	}
108
109	sysadm	1.10	(*p_display_len) += 2;
110	sysadm	1.1	}
111			else
112			{
113	sysadm	1.6	if (*p_display_len + 1 > max_display_len)
114	sysadm	1.1	{
115			break;
116			}
117	sysadm	1.4	(*p_display_len)++;
118	sysadm	1.12
119	sysadm	1.14	// \n is regarded as 1 character wide in terminal editor, which is different from Web version
120	sysadm	1.12	if (c == '\n')
121			{
122			i++;
123			*p_eol = 1;
124			break;
125			}
126	sysadm	1.1	}
127			}
128
129			return i;
130			}
131
132	sysadm	1.19	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	sysadm	1.1	{
135	sysadm	1.7	int line_cnt = 0;
136	sysadm	1.13	int len;
137	sysadm	1.1	int end_of_line = 0;
138	sysadm	1.4	int display_len = 0;
139
140	sysadm	1.1	p_line_offsets[line_cnt] = 0L;
141
142	sysadm	1.13	do
143	sysadm	1.1	{
144	sysadm	1.17	len = split_line(p_buf, max_display_len, &end_of_line, &display_len, skip_ctrl_seq);
145	sysadm	1.8
146	sysadm	1.19	if (p_line_widths)
147			{
148			p_line_widths[line_cnt] = display_len;
149			}
150
151	sysadm	1.8	// Exceed max_line_cnt
152	sysadm	1.9	if (line_cnt + 1 >= line_offsets_count)
153	sysadm	1.1	{
154	sysadm	1.16	// log_error("Line count %d reaches limit %d\n", line_cnt + 1, line_offsets_count);
155	sysadm	1.8	return line_cnt;
156	sysadm	1.1	}
157	sysadm	1.8
158			p_line_offsets[line_cnt + 1] = p_line_offsets[line_cnt] + len;
159			line_cnt++;
160			p_buf += len;
161	sysadm	1.13	} while (p_buf[0] != '\0');
162	sysadm	1.1
163			return line_cnt;
164			}
165	sysadm	1.14
166	sysadm	1.17	int str_filter(char *buffer, int skip_ctrl_seq)
167	sysadm	1.14	{
168			int i;
169			int j;
170
171			for (i = 0, j = 0; buffer[i] != '\0'; i++)
172			{
173	sysadm	1.15	if (buffer[i] == '\r' \|\| buffer[i] == '\7') // skip
174	sysadm	1.14	{
175			continue;
176			}
177
178	sysadm	1.17	if (skip_ctrl_seq && buffer[i] == '\033' && buffer[i + 1] == '[') // Skip control sequence
179	sysadm	1.14	{
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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