lbbs/src/str_process.c

/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * str_process
 *   - common string processing features with UTF-8 support
 *
 * Copyright (C) 2004-2025  Leaflet <leaflet@leafok.com>
 */

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

int UTF8_fixed_width = 1;

int str_length(const char *str, int skip_ctrl_seq)
{
        int str_len;
        char input_str[5];
        wchar_t wcs[2];
        int wc_len;
        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
                {
                        for (i = i + 2; isdigit(str[i]) || str[i] == ';' || str[i] == '?'; i++)
                                ;

                        if (str[i] == 'm') // valid
                        {
                                // skip
                        }
                        else if (isalpha(str[i]))
                        {
                                // unsupported ANSI CSI command
                        }
                        else
                        {
                                i--;
                        }

                        continue;
                }

                // Process UTF-8 Chinese characters
                if (c & 0x80) // head of multi-byte character
                {
                        str_len = 0;
                        c = (char)(c & 0xf0);
                        while (c & 0x80)
                        {
                                input_str[str_len] = str[i + str_len];
                                str_len++;
                                c = (c & 0x7f) << 1;
                        }
                        input_str[str_len] = '\0';

                        if (mbstowcs(wcs, input_str, 1) == (size_t)-1)
                        {
                                log_error("mbstowcs(%s) error\n", input_str);
                        }
                        wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));

                        i += (str_len - 1);
                        ret += wc_len;
                }
                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;
        int str_len;
        char input_str[5];
        wchar_t wcs[2];
        int wc_len;

        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
                {
                        str_len = 0;
                        c = (char)(c & 0xf0);
                        while (c & 0x80)
                        {
                                input_str[str_len] = buffer[i + str_len];
                                str_len++;
                                c = (c & 0x7f) << 1;
                        }
                        input_str[str_len] = '\0';

                        if (mbstowcs(wcs, input_str, 1) == (size_t)-1)
                        {
                                log_error("mbstowcs(%s) error\n", input_str);
                        }
                        wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));
                        if (*p_display_len + wc_len > max_display_len)
                        {
                                break;
                        }

                        i += (str_len - 1);
                        (*p_display_len) += wc_len;
                }
                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' || end_of_line);

        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	1.23	/* SPDX-License-Identifier: GPL-3.0-or-later */
2			/*
3			* str_process
4			* - common string processing features with UTF-8 support
5			*
6	sysadm	1.24	* Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com>
7	sysadm	1.23	*/
8	sysadm	1.1
9			#include "common.h"
10			#include "log.h"
11	sysadm	1.18	#include "str_process.h"
12	sysadm	1.22	#include <ctype.h>
13	sysadm	1.1	#include <stdio.h>
14	sysadm	1.28	#include <stdlib.h>
15	sysadm	1.1	#include <string.h>
16	sysadm	1.28	#include <wchar.h>
17
18			int UTF8_fixed_width = 1;
19	sysadm	1.1
20	sysadm	1.20	int str_length(const char *str, int skip_ctrl_seq)
21			{
22	sysadm	1.28	int str_len;
23			char input_str[5];
24			wchar_t wcs[2];
25			int wc_len;
26	sysadm	1.20	int i;
27			char c;
28			int ret = 0;
29
30			for (i = 0; str[i] != '\0'; i++)
31			{
32			c = str[i];
33
34			if (c == '\r' \|\| c == '\7') // skip
35			{
36			continue;
37			}
38
39			if (skip_ctrl_seq && c == '\033' && str[i + 1] == '[') // Skip control sequence
40			{
41	sysadm	1.22	for (i = i + 2; isdigit(str[i]) \|\| str[i] == ';' \|\| str[i] == '?'; i++)
42			;
43
44			if (str[i] == 'm') // valid
45			{
46			// skip
47			}
48			else if (isalpha(str[i]))
49			{
50			// unsupported ANSI CSI command
51			}
52			else
53	sysadm	1.20	{
54	sysadm	1.22	i--;
55	sysadm	1.20	}
56	sysadm	1.22
57	sysadm	1.20	continue;
58			}
59
60			// Process UTF-8 Chinese characters
61	sysadm	1.21	if (c & 0x80) // head of multi-byte character
62	sysadm	1.20	{
63	sysadm	1.28	str_len = 0;
64			c = (char)(c & 0xf0);
65	sysadm	1.21	while (c & 0x80)
66	sysadm	1.20	{
67	sysadm	1.28	input_str[str_len] = str[i + str_len];
68			str_len++;
69	sysadm	1.21	c = (c & 0x7f) << 1;
70	sysadm	1.20	}
71	sysadm	1.28	input_str[str_len] = '\0';
72	sysadm	1.20
73	sysadm	1.28	if (mbstowcs(wcs, input_str, 1) == (size_t)-1)
74			{
75			log_error("mbstowcs(%s) error\n", input_str);
76			}
77			wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));
78
79			i += (str_len - 1);
80			ret += wc_len;
81	sysadm	1.20	}
82			else
83			{
84			ret++;
85			}
86			}
87
88			return ret;
89			}
90
91	sysadm	1.17	int split_line(const char buffer, int max_display_len, int p_eol, int *p_display_len, int skip_ctrl_seq)
92	sysadm	1.1	{
93	sysadm	1.7	int i;
94	sysadm	1.1	*p_eol = 0;
95	sysadm	1.4	*p_display_len = 0;
96	sysadm	1.11	char c;
97	sysadm	1.28	int str_len;
98			char input_str[5];
99			wchar_t wcs[2];
100			int wc_len;
101	sysadm	1.1
102	sysadm	1.7	for (i = 0; buffer[i] != '\0'; i++)
103	sysadm	1.1	{
104	sysadm	1.11	c = buffer[i];
105	sysadm	1.1
106			if (c == '\r' \|\| c == '\7') // skip
107			{
108			continue;
109			}
110
111	sysadm	1.17	if (skip_ctrl_seq && c == '\033' && buffer[i + 1] == '[') // Skip control sequence
112	sysadm	1.1	{
113			i += 2;
114	sysadm	1.7	while (buffer[i] != '\0' && buffer[i] != 'm')
115	sysadm	1.1	{
116			i++;
117			}
118			continue;
119			}
120
121	sysadm	1.21	if (c & 0x80) // head of multi-byte character
122	sysadm	1.1	{
123	sysadm	1.28	str_len = 0;
124			c = (char)(c & 0xf0);
125			while (c & 0x80)
126	sysadm	1.1	{
127	sysadm	1.28	input_str[str_len] = buffer[i + str_len];
128			str_len++;
129			c = (c & 0x7f) << 1;
130	sysadm	1.1	}
131	sysadm	1.28	input_str[str_len] = '\0';
132	sysadm	1.20
133	sysadm	1.28	if (mbstowcs(wcs, input_str, 1) == (size_t)-1)
134			{
135			log_error("mbstowcs(%s) error\n", input_str);
136			}
137			wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));
138			if (*p_display_len + wc_len > max_display_len)
139	sysadm	1.20	{
140	sysadm	1.28	break;
141	sysadm	1.20	}
142
143	sysadm	1.28	i += (str_len - 1);
144			(*p_display_len) += wc_len;
145	sysadm	1.1	}
146			else
147			{
148	sysadm	1.6	if (*p_display_len + 1 > max_display_len)
149	sysadm	1.1	{
150			break;
151			}
152	sysadm	1.4	(*p_display_len)++;
153	sysadm	1.12
154	sysadm	1.14	// \n is regarded as 1 character wide in terminal editor, which is different from Web version
155	sysadm	1.12	if (c == '\n')
156			{
157			i++;
158			*p_eol = 1;
159			break;
160			}
161	sysadm	1.1	}
162			}
163
164			return i;
165			}
166
167	sysadm	1.19	long split_data_lines(const char p_buf, int max_display_len, long p_line_offsets, long line_offsets_count,
168			int skip_ctrl_seq, int *p_line_widths)
169	sysadm	1.1	{
170	sysadm	1.7	int line_cnt = 0;
171	sysadm	1.13	int len;
172	sysadm	1.1	int end_of_line = 0;
173	sysadm	1.4	int display_len = 0;
174
175	sysadm	1.1	p_line_offsets[line_cnt] = 0L;
176
177	sysadm	1.13	do
178	sysadm	1.1	{
179	sysadm	1.17	len = split_line(p_buf, max_display_len, &end_of_line, &display_len, skip_ctrl_seq);
180	sysadm	1.8
181	sysadm	1.19	if (p_line_widths)
182			{
183			p_line_widths[line_cnt] = display_len;
184			}
185
186	sysadm	1.8	// Exceed max_line_cnt
187	sysadm	1.9	if (line_cnt + 1 >= line_offsets_count)
188	sysadm	1.1	{
189	sysadm	1.16	// log_error("Line count %d reaches limit %d\n", line_cnt + 1, line_offsets_count);
190	sysadm	1.8	return line_cnt;
191	sysadm	1.1	}
192	sysadm	1.8
193			p_line_offsets[line_cnt + 1] = p_line_offsets[line_cnt] + len;
194			line_cnt++;
195			p_buf += len;
196	sysadm	1.27	} while (p_buf[0] != '\0' \|\| end_of_line);
197	sysadm	1.1
198			return line_cnt;
199			}
200	sysadm	1.14
201	sysadm	1.17	int str_filter(char *buffer, int skip_ctrl_seq)
202	sysadm	1.14	{
203			int i;
204			int j;
205
206			for (i = 0, j = 0; buffer[i] != '\0'; i++)
207			{
208	sysadm	1.15	if (buffer[i] == '\r' \|\| buffer[i] == '\7') // skip
209	sysadm	1.14	{
210			continue;
211			}
212
213	sysadm	1.17	if (skip_ctrl_seq && buffer[i] == '\033' && buffer[i + 1] == '[') // Skip control sequence
214	sysadm	1.14	{
215			i += 2;
216			while (buffer[i] != '\0' && buffer[i] != 'm')
217			{
218			i++;
219			}
220			continue;
221			}
222
223			buffer[j] = buffer[i];
224			j++;
225			}
226
227			buffer[j] = '\0';
228
229			return j;
230			}
webmaster@leafok.com	ViewVC Help
Powered by ViewVC 1.3.0-beta1