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 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 < 0 || c > 127) // GBK chinese character
                {
                        if (*p_display_len + 2 > max_display_len)
                        {
                                break;
                        }
                        i++;
                        (*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	1.17	int split_line(const char buffer, int max_display_len, int p_eol, int *p_display_len, int skip_ctrl_seq)
24	sysadm	1.1	{
25	sysadm	1.7	int i;
26	sysadm	1.1	*p_eol = 0;
27	sysadm	1.4	*p_display_len = 0;
28	sysadm	1.11	char c;
29	sysadm	1.1
30	sysadm	1.7	for (i = 0; buffer[i] != '\0'; i++)
31	sysadm	1.1	{
32	sysadm	1.11	c = buffer[i];
33	sysadm	1.1
34			if (c == '\r' \|\| c == '\7') // skip
35			{
36			continue;
37			}
38
39	sysadm	1.17	if (skip_ctrl_seq && c == '\033' && buffer[i + 1] == '[') // Skip control sequence
40	sysadm	1.1	{
41			i += 2;
42	sysadm	1.7	while (buffer[i] != '\0' && buffer[i] != 'm')
43	sysadm	1.1	{
44			i++;
45			}
46			continue;
47			}
48
49	sysadm	1.10	if (c < 0 \|\| c > 127) // GBK chinese character
50	sysadm	1.1	{
51	sysadm	1.6	if (*p_display_len + 2 > max_display_len)
52	sysadm	1.1	{
53			break;
54			}
55			i++;
56	sysadm	1.10	(*p_display_len) += 2;
57	sysadm	1.1	}
58			else
59			{
60	sysadm	1.6	if (*p_display_len + 1 > max_display_len)
61	sysadm	1.1	{
62			break;
63			}
64	sysadm	1.4	(*p_display_len)++;
65	sysadm	1.12
66	sysadm	1.14	// \n is regarded as 1 character wide in terminal editor, which is different from Web version
67	sysadm	1.12	if (c == '\n')
68			{
69			i++;
70			*p_eol = 1;
71			break;
72			}
73	sysadm	1.1	}
74			}
75
76			return i;
77			}
78
79	sysadm	1.19	long split_data_lines(const char p_buf, int max_display_len, long p_line_offsets, long line_offsets_count,
80			int skip_ctrl_seq, int *p_line_widths)
81	sysadm	1.1	{
82	sysadm	1.7	int line_cnt = 0;
83	sysadm	1.13	int len;
84	sysadm	1.1	int end_of_line = 0;
85	sysadm	1.4	int display_len = 0;
86
87	sysadm	1.1	p_line_offsets[line_cnt] = 0L;
88
89	sysadm	1.13	do
90	sysadm	1.1	{
91	sysadm	1.17	len = split_line(p_buf, max_display_len, &end_of_line, &display_len, skip_ctrl_seq);
92	sysadm	1.8
93	sysadm	1.19	if (p_line_widths)
94			{
95			p_line_widths[line_cnt] = display_len;
96			}
97
98	sysadm	1.8	// Exceed max_line_cnt
99	sysadm	1.9	if (line_cnt + 1 >= line_offsets_count)
100	sysadm	1.1	{
101	sysadm	1.16	// log_error("Line count %d reaches limit %d\n", line_cnt + 1, line_offsets_count);
102	sysadm	1.8	return line_cnt;
103	sysadm	1.1	}
104	sysadm	1.8
105			p_line_offsets[line_cnt + 1] = p_line_offsets[line_cnt] + len;
106			line_cnt++;
107			p_buf += len;
108	sysadm	1.13	} while (p_buf[0] != '\0');
109	sysadm	1.1
110			return line_cnt;
111			}
112	sysadm	1.14
113	sysadm	1.17	int str_filter(char *buffer, int skip_ctrl_seq)
114	sysadm	1.14	{
115			int i;
116			int j;
117
118			for (i = 0, j = 0; buffer[i] != '\0'; i++)
119			{
120	sysadm	1.15	if (buffer[i] == '\r' \|\| buffer[i] == '\7') // skip
121	sysadm	1.14	{
122			continue;
123			}
124
125	sysadm	1.17	if (skip_ctrl_seq && buffer[i] == '\033' && buffer[i + 1] == '[') // Skip control sequence
126	sysadm	1.14	{
127			i += 2;
128			while (buffer[i] != '\0' && buffer[i] != 'm')
129			{
130			i++;
131			}
132			continue;
133			}
134
135			buffer[j] = buffer[i];
136			j++;
137			}
138
139			buffer[j] = '\0';
140
141			return j;
142			}
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