lbbs/src/lml.c

/***************************************************************************
                                                        lml.h  -  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 "lml.h"
#include "log.h"
#include <stdio.h>
#include <string.h>
#include <sys/param.h>

#define LML_TAG_PARAM_BUF_LEN 256
#define LML_TAG_OUTPUT_BUF_LEN 1024

typedef int (*lml_tag_filter_cb)(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len);

static int lml_tag_color_filter(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len)
{
        if (strcasecmp(tag_name, "color") == 0)
        {
                if (strcasecmp(tag_param_buf, "red") == 0)
                {
                        return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;31m");
                }
                else if (strcasecmp(tag_param_buf, "green") == 0)
                {
                        return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;32m");
                }
                else if (strcasecmp(tag_param_buf, "yellow") == 0)
                {
                        return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;33m");
                }
                else if (strcasecmp(tag_param_buf, "blue") == 0)
                {
                        return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;34m");
                }
                else if (strcasecmp(tag_param_buf, "magenta") == 0)
                {
                        return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;35m");
                }
                else if (strcasecmp(tag_param_buf, "cyan") == 0)
                {
                        return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;36m");
                }
                else if (strcasecmp(tag_param_buf, "black") == 0)
                {
                        return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;30;47m");
                }
        }
        return 0;
}

#define LML_TAG_QUOTE_MAX_LEVEL 10
#define LML_TAG_QUOTE_LEVEL_LOOP 3

static const char *lml_tag_quote_color[] = {
        "\033[33m", // yellow
        "\033[32m", // green
        "\033[35m", // magenta
};

static int lml_tag_quote_level = 0;

static int lml_tag_quote_filter(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len)
{
        if (strcasecmp(tag_name, "quote") == 0)
        {
                if (lml_tag_quote_level <= LML_TAG_QUOTE_MAX_LEVEL)
                {
                        lml_tag_quote_level++;
                }
                return snprintf(tag_output_buf, tag_output_buf_len, "%s",
                                                lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP]);
        }
        else if (strcasecmp(tag_name, "/quote") == 0)
        {
                if (lml_tag_quote_level > 0)
                {
                        lml_tag_quote_level--;
                }
                return snprintf(tag_output_buf, tag_output_buf_len, "%s",
                                                (lml_tag_quote_level > 0 ? lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP] : "\033[m"));
        }

        return 0;
}

const static char *lml_tag_def[][4] = {
        // Definition of tuple: {lml_tag, lml_output, default_param | lml_filter_cb, no_lml_output}
        {"left", "[", "", "[left]"},
        {"right", "]", "", "[right]"},
        {"bold", "\033[1m", "", ""}, // does not work in Fterm
        {"/bold", "\033[22m", NULL, ""},
        {"b", "\033[1m", "", ""},
        {"/b", "\033[22m", NULL, ""},
        {"italic", "\033[5m", "", ""},   // use blink instead
        {"/italic", "\033[m", NULL, ""}, // \033[25m does not work in Fterm
        {"i", "\033[5m", "", ""},
        {"/i", "\033[m", NULL, ""},
        {"underline", "\033[4m", "", ""},
        {"/underline", "\033[m", NULL, ""}, // \033[24m does not work in Fterm
        {"u", "\033[4m", "", ""},
        {"/u", "\033[m", NULL, ""},
        {"color", NULL, (const char *)lml_tag_color_filter, ""},
        {"/color", "\033[m", NULL, ""},
        {"quote", NULL, (const char *)lml_tag_quote_filter, ""},
        {"/quote", NULL, (const char *)lml_tag_quote_filter, ""},
        {"url", "", "", ""},
        {"/url", "（链接: %s）", NULL, ""},
        {"link", "", ""},
        {"/link", "（链接: %s）", NULL, ""},
        {"email", "", ""},
        {"/email", "（Email: %s）", NULL, ""},
        {"user", "", ""},
        {"/user", "（用户: %s）", NULL, ""},
        {"article", "", ""},
        {"/article", "（文章: %s）", NULL, ""},
        {"image", "（图片: %s）", "", "%s"},
        {"flash", "（Flash: %s）", "", ""},
        {"bwf", "\033[1;31m****\033[m", "", "****"},
};

#define LML_TAG_COUNT 31

static int lml_tag_name_len[LML_TAG_COUNT];
static int lml_ready = 0;

inline static void lml_init(void)
{
        int i;

        if (!lml_ready)
        {
                for (i = 0; i < LML_TAG_COUNT; i++)
                {
                        lml_tag_name_len[i] = (int)strlen(lml_tag_def[i][0]);
                }

                lml_ready = 1;
        }
}

int lml_render(const char *str_in, char *str_out, int buf_len, int lml_tag)
{
        char c;
        char tag_param_buf[LML_TAG_PARAM_BUF_LEN];
        char tag_output_buf[LML_TAG_OUTPUT_BUF_LEN];
        int i;
        int j = 0;
        int k;
        int tag_start_pos = -1;
        int tag_end_pos = -1;
        int tag_param_pos = -1;
        int tag_output_len;
        int new_line = 1;
        int fb_quote_level = 0;

        lml_init();

        lml_tag_quote_level = 0;

        for (i = 0; str_in[i] != '\0'; i++)
        {
                if (lml_tag && new_line)
                {
                        if (fb_quote_level > 0)
                        {
                                lml_tag_quote_level -= fb_quote_level;

                                tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "%s",
                                                                                  (lml_tag_quote_level > 0 ? lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP] : "\033[m"));
                                if (j + tag_output_len >= buf_len)
                                {
                                        log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
                                        str_out[j] = '\0';
                                        return j;
                                }
                                memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
                                j += tag_output_len;

                                fb_quote_level = 0;
                        }

                        while (str_in[i + fb_quote_level * 2] == ':' && str_in[i + fb_quote_level * 2 + 1] == ' ') // FB2000 quote leading str
                        {
                                fb_quote_level++;
                        }

                        if (fb_quote_level > 0)
                        {
                                lml_tag_quote_level += fb_quote_level;

                                tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "%s",
                                                                                  lml_tag_quote_color[(lml_tag_quote_level) % LML_TAG_QUOTE_LEVEL_LOOP]);
                                if (j + tag_output_len >= buf_len)
                                {
                                        log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
                                        str_out[j] = '\0';
                                        return j;
                                }
                                memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
                                j += tag_output_len;
                        }

                        new_line = 0;
                }

                if (str_in[i] == '\033' && str_in[i + 1] == '[') // Escape sequence -- copy directly
                {
                        for (k = i + 2; str_in[k] != '\0' && str_in[k] != 'm'; k++)
                                ;

                        if (str_in[k] == 'm') // Valid
                        {
                                if (j + (k - i + 1) >= buf_len)
                                {
                                        log_error("Buffer is not longer enough for output string %d >= %d\n", j + (k - i + 1), buf_len);
                                        str_out[j] = '\0';
                                        return j;
                                }
                                memcpy(str_out + j, str_in + i, (size_t)(k - i + 1));
                                j += (k - i + 1);
                                i = k;
                                continue;
                        }
                        else // reach end of string
                        {
                                break;
                        }
                }

                if (str_in[i] == '\n')
                {
                        tag_start_pos = -1; // jump out of tag at end of line
                        new_line = 1;
                }
                else if (str_in[i] == '\r')
                {
                        continue; // ignore '\r'
                }

                if (str_in[i] == '[')
                {
                        tag_start_pos = i + 1;
                }
                else if (str_in[i] == ']')
                {
                        if (tag_start_pos >= 0)
                        {
                                tag_end_pos = i;

                                // Skip space characters
                                while (str_in[tag_start_pos] == ' ')
                                {
                                        tag_start_pos++;
                                }

                                for (k = 0; k < LML_TAG_COUNT; k++)
                                {
                                        if (strncasecmp(lml_tag_def[k][0], str_in + tag_start_pos, (size_t)lml_tag_name_len[k]) == 0)
                                        {
                                                tag_param_pos = -1;
                                                switch (str_in[tag_start_pos + lml_tag_name_len[k]])
                                                {
                                                case ' ':
                                                        tag_param_pos = tag_start_pos + lml_tag_name_len[k] + 1;
                                                        while (str_in[tag_param_pos] == ' ')
                                                        {
                                                                tag_param_pos++;
                                                        }
                                                        strncpy(tag_param_buf, str_in + tag_param_pos, (size_t)MIN(tag_end_pos - tag_param_pos, LML_TAG_PARAM_BUF_LEN));
                                                        tag_param_buf[MIN(tag_end_pos - tag_param_pos, LML_TAG_PARAM_BUF_LEN)] = '\0';
                                                case ']':
                                                        if (tag_param_pos == -1 && lml_tag_def[k][1] != NULL && lml_tag_def[k][2] != NULL) // Apply default param if not defined
                                                        {
                                                                strncpy(tag_param_buf, lml_tag_def[k][2], LML_TAG_PARAM_BUF_LEN - 1);
                                                                tag_param_buf[LML_TAG_PARAM_BUF_LEN - 1] = '\0';
                                                        }
                                                        if (lml_tag)
                                                        {
                                                                if (lml_tag_def[k][1] != NULL)
                                                                {
                                                                        tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, lml_tag_def[k][1], tag_param_buf);
                                                                }
                                                                else
                                                                {
                                                                        tag_output_len = ((lml_tag_filter_cb)lml_tag_def[k][2])(
                                                                                lml_tag_def[k][0], tag_param_buf, tag_output_buf, LML_TAG_OUTPUT_BUF_LEN);
                                                                }
                                                        }
                                                        else
                                                        {
                                                                if (lml_tag_def[k][3] != NULL)
                                                                {
                                                                        tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, lml_tag_def[k][3], tag_param_buf);
                                                                }
                                                                else
                                                                {
                                                                        tag_output_len = 0;
                                                                }
                                                        }
                                                        if (j + tag_output_len >= buf_len)
                                                        {
                                                                log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
                                                                str_out[j] = '\0';
                                                                return j;
                                                        }
                                                        memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
                                                        j += tag_output_len;
                                                        break;
                                                default: // tag_name not match
                                                        continue;
                                                }
                                                break;
                                        }
                                }

                                tag_start_pos = -1;
                        }
                }
                else if (tag_start_pos == -1) // not in LML tag
                {
                        if (str_in[i] & 0b10000000) // head of multi-byte character
                        {
                                if (j + 4 >= buf_len) // Assuming UTF-8 CJK characters use 4 bytes, though most of them actually use 3 bytes
                                {
                                        log_error("Buffer is not longer enough for output string %ld >= %d\n", j + 4, buf_len);
                                        str_out[j] = '\0';
                                        return j;
                                }

                                c = (str_in[i] & 0b01110000) << 1;
                                while (c & 0b10000000)
                                {
                                        str_out[j++] = str_in[i++];
                                        if (str_in[i] == '\0')
                                        {
                                                str_out[j] = '\0';
                                                return j;
                                        }
                                        c = (c & 0b01111111) << 1;
                                }
                        }

                        if (j + 1 >= buf_len)
                        {
                                log_error("Buffer is not longer enough for output string %ld >= %d\n", j + 1, buf_len);
                                str_out[j] = '\0';
                                return j;
                        }
                        str_out[j++] = str_in[i];
                }
                else // in LML tag
                {
                        // Do nothing
                }
        }

        if (lml_tag && lml_tag_quote_level > 0)
        {
                tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "\033[m");
                if (j + tag_output_len >= buf_len)
                {
                        log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
                        str_out[j] = '\0';
                        return j;
                }
                memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
                j += tag_output_len;
        }

        str_out[j] = '\0';

        return j;
}
1	sysadm	1.1	/***************************************************************************
2			lml.h - 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	sysadm	1.12	#include "common.h"
18	sysadm	1.1	#include "lml.h"
19			#include "log.h"
20			#include <stdio.h>
21			#include <string.h>
22			#include <sys/param.h>
23
24	sysadm	1.2	#define LML_TAG_PARAM_BUF_LEN 256
25			#define LML_TAG_OUTPUT_BUF_LEN 1024
26	sysadm	1.1
27	sysadm	1.3	typedef int (lml_tag_filter_cb)(const char tag_name, const char tag_param_buf, char tag_output_buf, size_t tag_output_buf_len);
28
29			static int lml_tag_color_filter(const char tag_name, const char tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len)
30			{
31			if (strcasecmp(tag_name, "color") == 0)
32			{
33			if (strcasecmp(tag_param_buf, "red") == 0)
34			{
35			return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;31m");
36			}
37			else if (strcasecmp(tag_param_buf, "green") == 0)
38			{
39			return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;32m");
40			}
41			else if (strcasecmp(tag_param_buf, "yellow") == 0)
42			{
43			return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;33m");
44			}
45			else if (strcasecmp(tag_param_buf, "blue") == 0)
46			{
47			return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;34m");
48			}
49			else if (strcasecmp(tag_param_buf, "magenta") == 0)
50			{
51			return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;35m");
52			}
53			else if (strcasecmp(tag_param_buf, "cyan") == 0)
54			{
55			return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;36m");
56			}
57			else if (strcasecmp(tag_param_buf, "black") == 0)
58			{
59			return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;30;47m");
60			}
61			}
62			return 0;
63			}
64	sysadm	1.1
65	sysadm	1.4	#define LML_TAG_QUOTE_MAX_LEVEL 10
66			#define LML_TAG_QUOTE_LEVEL_LOOP 3
67
68			static const char *lml_tag_quote_color[] = {
69	sysadm	1.5	"\033[33m", // yellow
70			"\033[32m", // green
71			"\033[35m", // magenta
72	sysadm	1.4	};
73
74			static int lml_tag_quote_level = 0;
75
76			static int lml_tag_quote_filter(const char tag_name, const char tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len)
77			{
78			if (strcasecmp(tag_name, "quote") == 0)
79			{
80			if (lml_tag_quote_level <= LML_TAG_QUOTE_MAX_LEVEL)
81			{
82			lml_tag_quote_level++;
83			}
84	sysadm	1.14	return snprintf(tag_output_buf, tag_output_buf_len, "%s",
85			lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP]);
86	sysadm	1.4	}
87			else if (strcasecmp(tag_name, "/quote") == 0)
88			{
89			if (lml_tag_quote_level > 0)
90			{
91			lml_tag_quote_level--;
92			}
93	sysadm	1.14	return snprintf(tag_output_buf, tag_output_buf_len, "%s",
94	sysadm	1.5	(lml_tag_quote_level > 0 ? lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP] : "\033[m"));
95	sysadm	1.4	}
96
97			return 0;
98			}
99
100	sysadm	1.19	const static char *lml_tag_def[][4] = {
101	sysadm	1.15	// Definition of tuple: {lml_tag, lml_output, default_param \| lml_filter_cb, no_lml_output}
102			{"left", "[", "", "[left]"},
103			{"right", "]", "", "[right]"},
104			{"bold", "\033[1m", "", ""}, // does not work in Fterm
105			{"/bold", "\033[22m", NULL, ""},
106			{"b", "\033[1m", "", ""},
107			{"/b", "\033[22m", NULL, ""},
108			{"italic", "\033[5m", "", ""}, // use blink instead
109			{"/italic", "\033[m", NULL, ""}, // \033[25m does not work in Fterm
110			{"i", "\033[5m", "", ""},
111			{"/i", "\033[m", NULL, ""},
112			{"underline", "\033[4m", "", ""},
113			{"/underline", "\033[m", NULL, ""}, // \033[24m does not work in Fterm
114			{"u", "\033[4m", "", ""},
115			{"/u", "\033[m", NULL, ""},
116			{"color", NULL, (const char *)lml_tag_color_filter, ""},
117			{"/color", "\033[m", NULL, ""},
118			{"quote", NULL, (const char *)lml_tag_quote_filter, ""},
119			{"/quote", NULL, (const char *)lml_tag_quote_filter, ""},
120			{"url", "", "", ""},
121	sysadm	1.17	{"/url", "（链接: %s）", NULL, ""},
122	sysadm	1.2	{"link", "", ""},
123	sysadm	1.17	{"/link", "（链接: %s）", NULL, ""},
124	sysadm	1.2	{"email", "", ""},
125	sysadm	1.17	{"/email", "（Email: %s）", NULL, ""},
126	sysadm	1.2	{"user", "", ""},
127	sysadm	1.17	{"/user", "（用户: %s）", NULL, ""},
128	sysadm	1.2	{"article", "", ""},
129	sysadm	1.17	{"/article", "（文章: %s）", NULL, ""},
130			{"image", "（图片: %s）", "", "%s"},
131			{"flash", "（Flash: %s）", "", ""},
132	sysadm	1.15	{"bwf", "\033[1;31m**\033[m", "", "**"},
133	sysadm	1.1	};
134
135	sysadm	1.4	#define LML_TAG_COUNT 31
136	sysadm	1.3
137	sysadm	1.19	static int lml_tag_name_len[LML_TAG_COUNT];
138			static int lml_ready = 0;
139	sysadm	1.1
140			inline static void lml_init(void)
141			{
142			int i;
143
144	sysadm	1.19	if (!lml_ready)
145	sysadm	1.1	{
146			for (i = 0; i < LML_TAG_COUNT; i++)
147			{
148	sysadm	1.19	lml_tag_name_len[i] = (int)strlen(lml_tag_def[i][0]);
149	sysadm	1.1	}
150
151	sysadm	1.19	lml_ready = 1;
152	sysadm	1.1	}
153			}
154
155	sysadm	1.18	int lml_render(const char str_in, char str_out, int buf_len, int lml_tag)
156	sysadm	1.1	{
157	sysadm	1.13	char c;
158	sysadm	1.2	char tag_param_buf[LML_TAG_PARAM_BUF_LEN];
159	sysadm	1.1	char tag_output_buf[LML_TAG_OUTPUT_BUF_LEN];
160			int i;
161			int j = 0;
162			int k;
163			int tag_start_pos = -1;
164			int tag_end_pos = -1;
165	sysadm	1.2	int tag_param_pos = -1;
166	sysadm	1.1	int tag_output_len;
167	sysadm	1.5	int new_line = 1;
168			int fb_quote_level = 0;
169	sysadm	1.1
170			lml_init();
171
172	sysadm	1.4	lml_tag_quote_level = 0;
173
174	sysadm	1.1	for (i = 0; str_in[i] != '\0'; i++)
175			{
176	sysadm	1.15	if (lml_tag && new_line)
177	sysadm	1.5	{
178			if (fb_quote_level > 0)
179			{
180			lml_tag_quote_level -= fb_quote_level;
181
182	sysadm	1.14	tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "%s",
183	sysadm	1.5	(lml_tag_quote_level > 0 ? lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP] : "\033[m"));
184	sysadm	1.8	if (j + tag_output_len >= buf_len)
185	sysadm	1.5	{
186	sysadm	1.8	log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
187	sysadm	1.5	str_out[j] = '\0';
188			return j;
189			}
190			memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
191			j += tag_output_len;
192
193			fb_quote_level = 0;
194			}
195
196			while (str_in[i + fb_quote_level * 2] == ':' && str_in[i + fb_quote_level * 2 + 1] == ' ') // FB2000 quote leading str
197			{
198			fb_quote_level++;
199			}
200
201			if (fb_quote_level > 0)
202			{
203			lml_tag_quote_level += fb_quote_level;
204
205	sysadm	1.14	tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "%s",
206	sysadm	1.5	lml_tag_quote_color[(lml_tag_quote_level) % LML_TAG_QUOTE_LEVEL_LOOP]);
207	sysadm	1.8	if (j + tag_output_len >= buf_len)
208	sysadm	1.5	{
209	sysadm	1.8	log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
210	sysadm	1.5	str_out[j] = '\0';
211			return j;
212			}
213			memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
214			j += tag_output_len;
215			}
216
217			new_line = 0;
218			}
219
220	sysadm	1.8	if (str_in[i] == '\033' && str_in[i + 1] == '[') // Escape sequence -- copy directly
221			{
222			for (k = i + 2; str_in[k] != '\0' && str_in[k] != 'm'; k++)
223			;
224
225			if (str_in[k] == 'm') // Valid
226			{
227			if (j + (k - i + 1) >= buf_len)
228			{
229			log_error("Buffer is not longer enough for output string %d >= %d\n", j + (k - i + 1), buf_len);
230			str_out[j] = '\0';
231			return j;
232			}
233			memcpy(str_out + j, str_in + i, (size_t)(k - i + 1));
234	sysadm	1.9	j += (k - i + 1);
235	sysadm	1.8	i = k;
236			continue;
237			}
238			else // reach end of string
239			{
240			break;
241			}
242			}
243
244	sysadm	1.5	if (str_in[i] == '\n')
245			{
246			tag_start_pos = -1; // jump out of tag at end of line
247			new_line = 1;
248			}
249			else if (str_in[i] == '\r')
250			{
251			continue; // ignore '\r'
252			}
253
254	sysadm	1.1	if (str_in[i] == '[')
255			{
256			tag_start_pos = i + 1;
257			}
258			else if (str_in[i] == ']')
259			{
260			if (tag_start_pos >= 0)
261			{
262			tag_end_pos = i;
263
264			// Skip space characters
265			while (str_in[tag_start_pos] == ' ')
266			{
267			tag_start_pos++;
268			}
269
270			for (k = 0; k < LML_TAG_COUNT; k++)
271			{
272	sysadm	1.19	if (strncasecmp(lml_tag_def[k][0], str_in + tag_start_pos, (size_t)lml_tag_name_len[k]) == 0)
273	sysadm	1.1	{
274	sysadm	1.2	tag_param_pos = -1;
275	sysadm	1.19	switch (str_in[tag_start_pos + lml_tag_name_len[k]])
276	sysadm	1.1	{
277			case ' ':
278	sysadm	1.19	tag_param_pos = tag_start_pos + lml_tag_name_len[k] + 1;
279	sysadm	1.1	while (str_in[tag_param_pos] == ' ')
280			{
281			tag_param_pos++;
282			}
283	sysadm	1.2	strncpy(tag_param_buf, str_in + tag_param_pos, (size_t)MIN(tag_end_pos - tag_param_pos, LML_TAG_PARAM_BUF_LEN));
284			tag_param_buf[MIN(tag_end_pos - tag_param_pos, LML_TAG_PARAM_BUF_LEN)] = '\0';
285			case ']':
286	sysadm	1.19	if (tag_param_pos == -1 && lml_tag_def[k][1] != NULL && lml_tag_def[k][2] != NULL) // Apply default param if not defined
287	sysadm	1.1	{
288	sysadm	1.19	strncpy(tag_param_buf, lml_tag_def[k][2], LML_TAG_PARAM_BUF_LEN - 1);
289	sysadm	1.2	tag_param_buf[LML_TAG_PARAM_BUF_LEN - 1] = '\0';
290	sysadm	1.1	}
291	sysadm	1.15	if (lml_tag)
292	sysadm	1.3	{
293	sysadm	1.19	if (lml_tag_def[k][1] != NULL)
294	sysadm	1.15	{
295	sysadm	1.19	tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, lml_tag_def[k][1], tag_param_buf);
296	sysadm	1.15	}
297			else
298			{
299	sysadm	1.19	tag_output_len = ((lml_tag_filter_cb)lml_tag_def[k][2])(
300			lml_tag_def[k][0], tag_param_buf, tag_output_buf, LML_TAG_OUTPUT_BUF_LEN);
301	sysadm	1.15	}
302	sysadm	1.3	}
303			else
304			{
305	sysadm	1.19	if (lml_tag_def[k][3] != NULL)
306	sysadm	1.15	{
307	sysadm	1.19	tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, lml_tag_def[k][3], tag_param_buf);
308	sysadm	1.15	}
309			else
310			{
311			tag_output_len = 0;
312			}
313	sysadm	1.3	}
314	sysadm	1.8	if (j + tag_output_len >= buf_len)
315	sysadm	1.1	{
316	sysadm	1.8	log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
317	sysadm	1.1	str_out[j] = '\0';
318			return j;
319			}
320			memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
321			j += tag_output_len;
322			break;
323			default: // tag_name not match
324			continue;
325			}
326			break;
327			}
328			}
329
330			tag_start_pos = -1;
331			}
332			}
333			else if (tag_start_pos == -1) // not in LML tag
334			{
335	sysadm	1.13	if (str_in[i] & 0b10000000) // head of multi-byte character
336	sysadm	1.1	{
337	sysadm	1.13	if (j + 4 >= buf_len) // Assuming UTF-8 CJK characters use 4 bytes, though most of them actually use 3 bytes
338	sysadm	1.1	{
339	sysadm	1.13	log_error("Buffer is not longer enough for output string %ld >= %d\n", j + 4, buf_len);
340	sysadm	1.1	str_out[j] = '\0';
341			return j;
342			}
343	sysadm	1.13
344			c = (str_in[i] & 0b01110000) << 1;
345			while (c & 0b10000000)
346	sysadm	1.1	{
347	sysadm	1.13	str_out[j++] = str_in[i++];
348			if (str_in[i] == '\0')
349			{
350			str_out[j] = '\0';
351			return j;
352			}
353			c = (c & 0b01111111) << 1;
354	sysadm	1.1	}
355			}
356
357	sysadm	1.8	if (j + 1 >= buf_len)
358	sysadm	1.1	{
359	sysadm	1.8	log_error("Buffer is not longer enough for output string %ld >= %d\n", j + 1, buf_len);
360	sysadm	1.1	str_out[j] = '\0';
361			return j;
362			}
363			str_out[j++] = str_in[i];
364			}
365			else // in LML tag
366			{
367			// Do nothing
368			}
369			}
370
371	sysadm	1.15	if (lml_tag && lml_tag_quote_level > 0)
372	sysadm	1.5	{
373			tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "\033[m");
374	sysadm	1.8	if (j + tag_output_len >= buf_len)
375	sysadm	1.5	{
376	sysadm	1.8	log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
377	sysadm	1.5	str_out[j] = '\0';
378			return j;
379			}
380			memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
381			j += tag_output_len;
382			}
383
384	sysadm	1.1	str_out[j] = '\0';
385
386			return j;
387	sysadm	1.5	}
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