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/***************************************************************************
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str_process.c - description
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-------------------
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Copyright : (C) 2004-2025 by Leaflet
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Email : leaflet@leafok.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "str_process.h"
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#include "common.h"
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#include "log.h"
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#include <stdio.h>
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#include <string.h>
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unsigned int split_line(const char *buffer, int max_display_len, int *p_eol, int *p_display_len)
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{
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size_t len = strnlen(buffer, LINE_BUFFER_LEN);
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unsigned int i = 0;
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*p_eol = 0;
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*p_display_len = 0;
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if (len == 0)
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{
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return 0;
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}
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for (; i < len; i++)
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{
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char c = buffer[i];
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if (c == '\r' || c == '\7') // skip
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{
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continue;
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}
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if (c == '\n')
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{
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i++;
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*p_eol = 1;
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break;
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}
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if (c == '\033' && buffer[i + 1] == '[') // Skip control sequence
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{
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i += 2;
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while (i < len && buffer[i] != 'm')
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{
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i++;
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}
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continue;
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}
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if (c > 127 && c <= 255) // GBK chinese character
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{
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if (*p_display_len + 2 > max_display_len)
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{
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*p_eol = 1;
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break;
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}
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i++;
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*p_display_len += 2;
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}
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else
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{
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if (*p_display_len + 1 > max_display_len)
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{
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*p_eol = 1;
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break;
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}
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(*p_display_len)++;
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}
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}
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return i;
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}
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unsigned int split_file_lines(FILE *fin, int max_display_len, long *p_line_offsets, int max_line_cnt)
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{
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char buffer[LINE_BUFFER_LEN];
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char *p_buf = buffer;
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unsigned int line_cnt = 0;
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unsigned int len = 0;
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int end_of_line = 0;
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int display_len = 0;
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p_line_offsets[line_cnt] = 0L;
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while (fgets(p_buf, (int)(sizeof(buffer) - len), fin))
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{
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p_buf = buffer;
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while (1)
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{
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len = split_line(p_buf, max_display_len, &end_of_line, &display_len);
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if (len == 0 || !end_of_line) // !end_of_line == EOF
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{
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break;
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}
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// Exceed max_line_cnt
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if (line_cnt + 1 >= max_line_cnt)
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{
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log_error("File line count %d reaches limit\n", line_cnt + 1);
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return line_cnt;
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}
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p_line_offsets[line_cnt + 1] = p_line_offsets[line_cnt] + len;
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line_cnt++;
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p_buf += len;
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}
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// Move p_buf[0 .. len - 1] to head of buffer
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for (int i = 0; i < len; i++)
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{
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buffer[i] = p_buf[i];
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}
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p_buf = buffer + len;
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}
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if (len > 0 && line_cnt + 1 < max_line_cnt)
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{
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p_line_offsets[line_cnt + 1] = p_line_offsets[line_cnt] + len;
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line_cnt++;
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}
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return line_cnt;
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}
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