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/*************************************************************************** |
/* SPDX-License-Identifier: GPL-3.0-or-later */ |
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str_process.c - description |
/* |
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------------------- |
* str_process |
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Copyright : (C) 2004-2025 by Leaflet |
* - common string processing features with UTF-8 support |
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Email : leaflet@leafok.com |
* |
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***************************************************************************/ |
* Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com> |
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*/ |
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/*************************************************************************** |
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* * |
#ifdef HAVE_CONFIG_H |
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* This program is free software; you can redistribute it and/or modify * |
#include "config.h" |
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* it under the terms of the GNU General Public License as published by * |
#endif |
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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" |
#include "common.h" |
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#include "log.h" |
#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> |
#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
#include <string.h> |
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#include <wchar.h> |
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int UTF8_fixed_width = 1; |
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int split_line(const char *buffer, int max_display_len, int *p_eol, int *p_display_len) |
int str_length(const char *str, int skip_ctrl_seq) |
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{ |
{ |
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int str_len; |
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char input_str[5]; |
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wchar_t wcs[2]; |
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int wc_len; |
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int i; |
int i; |
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*p_eol = 0; |
char c; |
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*p_display_len = 0; |
int ret = 0; |
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for (i = 0; buffer[i] != '\0'; i++) |
for (i = 0; str[i] != '\0'; i++) |
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{ |
{ |
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char c = buffer[i]; |
c = str[i]; |
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if (c == '\r' || c == '\7') // skip |
if (c == '\r' || c == '\7') // skip |
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{ |
{ |
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continue; |
continue; |
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} |
} |
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if (c == '\n') |
if (skip_ctrl_seq && c == '\033' && str[i + 1] == '[') // Skip control sequence |
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{ |
{ |
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i++; |
for (i = i + 2; isdigit((int)str[i]) || str[i] == ';' || str[i] == '?'; i++) |
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*p_eol = 1; |
; |
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break; |
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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((int)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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if (c == '\033' && buffer[i + 1] == '[') // Skip control sequence |
// 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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str_len = 0; |
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c = (char)(c & 0xf0); |
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while (c & 0x80) |
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{ |
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input_str[str_len] = str[i + str_len]; |
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str_len++; |
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c = (c & 0x7f) << 1; |
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} |
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input_str[str_len] = '\0'; |
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if (mbstowcs(wcs, input_str, 1) == (size_t)-1) |
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{ |
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log_debug("mbstowcs(%s) error", input_str); |
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wc_len = (UTF8_fixed_width ? 2 : 1); // Fallback |
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} |
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else |
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{ |
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wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0])); |
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} |
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i += (str_len - 1); |
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ret += wc_len; |
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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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int str_len; |
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char input_str[5]; |
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wchar_t wcs[2]; |
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int wc_len; |
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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; |
i += 2; |
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while (buffer[i] != '\0' && buffer[i] != 'm') |
while (buffer[i] != '\0' && buffer[i] != 'm') |
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continue; |
continue; |
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} |
} |
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if (c > 127 && c <= 255) // GBK chinese character |
if (c & 0x80) // head of multi-byte character |
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{ |
{ |
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if (*p_display_len + 2 > max_display_len) |
str_len = 0; |
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c = (char)(c & 0xf0); |
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while (c & 0x80) |
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{ |
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input_str[str_len] = buffer[i + str_len]; |
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str_len++; |
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c = (c & 0x7f) << 1; |
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} |
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input_str[str_len] = '\0'; |
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if (mbstowcs(wcs, input_str, 1) == (size_t)-1) |
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{ |
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log_debug("mbstowcs(%s) error", input_str); |
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wc_len = (UTF8_fixed_width ? 2 : 1); // Fallback |
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} |
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else |
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{ |
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wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0])); |
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} |
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if (*p_display_len + wc_len > max_display_len) |
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{ |
{ |
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*p_eol = 1; |
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break; |
break; |
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} |
} |
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i++; |
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*p_display_len += 2; |
i += (str_len - 1); |
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(*p_display_len) += wc_len; |
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} |
} |
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else |
else |
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{ |
{ |
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if (*p_display_len + 1 > max_display_len) |
if (*p_display_len + 1 > max_display_len) |
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{ |
{ |
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*p_eol = 1; |
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break; |
break; |
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} |
} |
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(*p_display_len)++; |
(*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; |
return i; |
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} |
} |
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int split_file_lines(FILE *fin, int max_display_len, long *p_line_offsets, int max_line_cnt) |
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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char buffer[LINE_BUFFER_LEN]; |
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char *p_buf = buffer; |
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int line_cnt = 0; |
int line_cnt = 0; |
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int len = 0; |
int len; |
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int end_of_line = 0; |
int end_of_line = 0; |
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int display_len = 0; |
int display_len = 0; |
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p_line_offsets[line_cnt] = 0L; |
p_line_offsets[line_cnt] = 0L; |
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while (fgets(p_buf, (int)sizeof(buffer) - len, fin)) |
do |
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{ |
{ |
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p_buf = buffer; |
len = split_line(p_buf, max_display_len, &end_of_line, &display_len, skip_ctrl_seq); |
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while (1) |
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if (p_line_widths) |
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{ |
{ |
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len = split_line(p_buf, max_display_len, &end_of_line, &display_len); |
p_line_widths[line_cnt] = display_len; |
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} |
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if (len == 0 || !end_of_line) // !end_of_line == EOF |
// Exceed max_line_cnt |
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{ |
if (line_cnt + 1 >= line_offsets_count) |
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break; |
{ |
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} |
log_debug("Line count %d reaches limit %d", line_cnt + 1, line_offsets_count); |
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return line_cnt; |
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} |
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// Exceed max_line_cnt |
p_line_offsets[line_cnt + 1] = p_line_offsets[line_cnt] + len; |
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if (line_cnt + 1 >= max_line_cnt) |
line_cnt++; |
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{ |
p_buf += len; |
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log_error("File line count %d reaches limit\n", line_cnt + 1); |
} while (p_buf[0] != '\0' || end_of_line); |
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return line_cnt; |
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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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p_line_offsets[line_cnt + 1] = p_line_offsets[line_cnt] + len; |
for (i = 0, j = 0; buffer[i] != '\0'; i++) |
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line_cnt++; |
{ |
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p_buf += len; |
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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// Move p_buf[0 .. len - 1] to head of buffer |
if (skip_ctrl_seq && buffer[i] == '\033' && buffer[i + 1] == '[') // Skip control sequence |
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for (int i = 0; i < len; i++) |
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{ |
{ |
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buffer[i] = p_buf[i]; |
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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p_buf = buffer + len; |
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} |
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if (len > 0 && line_cnt + 1 < max_line_cnt) |
buffer[j] = buffer[i]; |
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{ |
j++; |
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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; |
buffer[j] = '\0'; |
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return j; |
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} |
} |