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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 "common.h"
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#include "log.h"
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#include "str_process.h"
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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int str_length(const char *str, int skip_ctrl_seq)
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{
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int i;
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char c;
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int ret = 0;
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for (i = 0; str[i] != '\0'; i++)
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{
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c = str[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 (skip_ctrl_seq && c == '\033' && str[i + 1] == '[') // Skip control sequence
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{
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for (i = i + 2; isdigit(str[i]) || str[i] == ';' || str[i] == '?'; i++)
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;
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if (str[i] == 'm') // valid
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{
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// skip
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}
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else if (isalpha(str[i]))
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{
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// unsupported ANSI CSI command
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}
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else
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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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// Process UTF-8 Chinese characters
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if (c & 0x80) // head of multi-byte character
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{
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c = (c & 0x70) << 1;
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while (c & 0x80)
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{
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i++;
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c = (c & 0x7f) << 1;
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}
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ret += 2;
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}
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else
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{
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ret++;
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}
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}
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return ret;
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}
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int split_line(const char *buffer, int max_display_len, int *p_eol, int *p_display_len, int skip_ctrl_seq)
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{
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int i;
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*p_eol = 0;
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*p_display_len = 0;
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char c;
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for (i = 0; buffer[i] != '\0'; i++)
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{
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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 (skip_ctrl_seq && c == '\033' && buffer[i + 1] == '[') // Skip control sequence
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{
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i += 2;
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while (buffer[i] != '\0' && 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 & 0x80) // head of multi-byte 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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break;
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}
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c = (c & 0x70) << 1;
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while (c & 0x80)
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{
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i++;
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c = (c & 0x7f) << 1;
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}
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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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break;
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}
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(*p_display_len)++;
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// \n is regarded as 1 character wide in terminal editor, which is different from Web version
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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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}
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}
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return i;
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}
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long split_data_lines(const char *p_buf, int max_display_len, long *p_line_offsets, long line_offsets_count,
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int skip_ctrl_seq, int *p_line_widths)
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{
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int line_cnt = 0;
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int len;
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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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do
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{
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len = split_line(p_buf, max_display_len, &end_of_line, &display_len, skip_ctrl_seq);
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if (p_line_widths)
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{
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p_line_widths[line_cnt] = display_len;
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}
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// Exceed max_line_cnt
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if (line_cnt + 1 >= line_offsets_count)
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{
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// log_error("Line count %d reaches limit %d\n", line_cnt + 1, line_offsets_count);
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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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} while (p_buf[0] != '\0');
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return line_cnt;
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}
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int str_filter(char *buffer, int skip_ctrl_seq)
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{
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int i;
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int j;
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for (i = 0, j = 0; buffer[i] != '\0'; i++)
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{
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if (buffer[i] == '\r' || buffer[i] == '\7') // skip
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{
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continue;
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}
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if (skip_ctrl_seq && buffer[i] == '\033' && buffer[i + 1] == '[') // Skip control sequence
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{
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i += 2;
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while (buffer[i] != '\0' && 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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buffer[j] = buffer[i];
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j++;
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}
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buffer[j] = '\0';
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return j;
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}
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