/* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* * Functions to define the character set * and do things specific to the character set. */ #include "less.h" #if HAVE_LOCALE #include <locale.h> #include <ctype.h> #include <langinfo.h> #endif #include "charset.h" #include "xbuf.h" #if MSDOS_COMPILER==WIN32C #define WIN32_LEAN_AND_MEAN #include <windows.h> #endif extern int bs_mode; public int utf_mode = 0; /* * Predefined character sets, * selected by the LESSCHARSET environment variable. */ struct charset { char *name; int *p_flag; char *desc; } charsets[] = { { "ascii", NULL, "8bcccbcc18b95.b" }, { "utf-8", &utf_mode, "8bcccbcc18b95.b126.bb" }, { "iso8859", NULL, "8bcccbcc18b95.33b." }, { "latin3", NULL, "8bcccbcc18b95.33b5.b8.b15.b4.b12.b18.b12.b." }, { "arabic", NULL, "8bcccbcc18b95.33b.3b.7b2.13b.3b.b26.5b19.b" }, { "greek", NULL, "8bcccbcc18b95.33b4.2b4.b3.b35.b44.b" }, { "greek2005", NULL, "8bcccbcc18b95.33b14.b35.b44.b" }, { "hebrew", NULL, "8bcccbcc18b95.33b.b29.32b28.2b2.b" }, { "koi8-r", NULL, "8bcccbcc18b95.b." }, { "KOI8-T", NULL, "8bcccbcc18b95.b8.b6.b8.b.b.5b7.3b4.b4.b3.b.b.3b." }, { "georgianps", NULL, "8bcccbcc18b95.3b11.4b12.2b." }, { "tcvn", NULL, "b..b...bcccbccbbb7.8b95.b48.5b." }, { "TIS-620", NULL, "8bcccbcc18b95.b.4b.11b7.8b." }, { "next", NULL, "8bcccbcc18b95.bb125.bb" }, { "dos", NULL, "8bcccbcc12bc5b95.b." }, { "windows-1251", NULL, "8bcccbcc12bc5b95.b24.b." }, { "windows-1252", NULL, "8bcccbcc12bc5b95.b.b11.b.2b12.b." }, { "windows-1255", NULL, "8bcccbcc12bc5b95.b.b8.b.5b9.b.4b." }, { "ebcdic", NULL, "5bc6bcc7bcc41b.9b7.9b5.b..8b6.10b6.b9.7b9.8b8.17b3.3b9.7b9.8b8.6b10.b.b.b." }, { "IBM-1047", NULL, "4cbcbc3b9cbccbccbb4c6bcc5b3cbbc4bc4bccbc191.b" }, { NULL, NULL, NULL } }; /* * Support "locale charmap"/nl_langinfo(CODESET) values, as well as others. */ struct cs_alias { char *name; char *oname; } cs_aliases[] = { { "UTF-8", "utf-8" }, { "utf8", "utf-8" }, { "UTF8", "utf-8" }, { "ANSI_X3.4-1968", "ascii" }, { "US-ASCII", "ascii" }, { "latin1", "iso8859" }, { "ISO-8859-1", "iso8859" }, { "latin9", "iso8859" }, { "ISO-8859-15", "iso8859" }, { "latin2", "iso8859" }, { "ISO-8859-2", "iso8859" }, { "ISO-8859-3", "latin3" }, { "latin4", "iso8859" }, { "ISO-8859-4", "iso8859" }, { "cyrillic", "iso8859" }, { "ISO-8859-5", "iso8859" }, { "ISO-8859-6", "arabic" }, { "ISO-8859-7", "greek" }, { "IBM9005", "greek2005" }, { "ISO-8859-8", "hebrew" }, { "latin5", "iso8859" }, { "ISO-8859-9", "iso8859" }, { "latin6", "iso8859" }, { "ISO-8859-10", "iso8859" }, { "latin7", "iso8859" }, { "ISO-8859-13", "iso8859" }, { "latin8", "iso8859" }, { "ISO-8859-14", "iso8859" }, { "latin10", "iso8859" }, { "ISO-8859-16", "iso8859" }, { "IBM437", "dos" }, { "EBCDIC-US", "ebcdic" }, { "IBM1047", "IBM-1047" }, { "KOI8-R", "koi8-r" }, { "KOI8-U", "koi8-r" }, { "GEORGIAN-PS", "georgianps" }, { "TCVN5712-1", "tcvn" }, { "NEXTSTEP", "next" }, { "windows", "windows-1252" }, /* backward compatibility */ { "CP1251", "windows-1251" }, { "CP1252", "windows-1252" }, { "CP1255", "windows-1255" }, { NULL, NULL } }; #define IS_BINARY_CHAR 01 #define IS_CONTROL_CHAR 02 static char chardef[256]; static char *binfmt = NULL; static char *utfbinfmt = NULL; public int binattr = AT_STANDOUT|AT_COLOR_BIN; static struct xbuffer user_wide_array; static struct xbuffer user_ubin_array; static struct xbuffer user_compose_array; static struct xbuffer user_prt_array; static struct wchar_range_table user_wide_table; static struct wchar_range_table user_ubin_table; static struct wchar_range_table user_compose_table; static struct wchar_range_table user_prt_table; /* * Set a wchar_range_table to the table in an xbuffer. */ static void wchar_range_table_set(struct wchar_range_table *tbl, struct xbuffer *arr) { tbl->table = (struct wchar_range *) arr->data; tbl->count = arr->end / sizeof(struct wchar_range); } /* * Skip over a "U" or "U+" prefix before a hex codepoint. */ static char * skip_uprefix(char *s) { if (*s == 'U' || *s == 'u') if (*++s == '+') ++s; return s; } /* * Parse a dash-separated range of hex values. */ static void wchar_range_get(char **ss, struct wchar_range *range) { char *s = skip_uprefix(*ss); range->first = lstrtoul(s, &s, 16); if (s[0] == '-') { s = skip_uprefix(&s[1]); range->last = lstrtoul(s, &s, 16); } else { range->last = range->first; } *ss = s; } /* * Parse the LESSUTFCHARDEF variable. */ static void ichardef_utf(char *s) { xbuf_init(&user_wide_array); xbuf_init(&user_ubin_array); xbuf_init(&user_compose_array); xbuf_init(&user_prt_array); if (s != NULL) { while (s[0] != '\0') { struct wchar_range range; wchar_range_get(&s, &range); if (range.last == 0) { error("invalid hex number(s) in LESSUTFCHARDEF", NULL_PARG); quit(QUIT_ERROR); } if (*s++ != ':') { error("missing colon in LESSUTFCHARDEF", NULL_PARG); quit(QUIT_ERROR); } switch (*s++) { case 'b': xbuf_add_data(&user_ubin_array, (unsigned char *) &range, sizeof(range)); break; case 'c': xbuf_add_data(&user_compose_array, (unsigned char *) &range, sizeof(range)); break; case 'w': xbuf_add_data(&user_wide_array, (unsigned char *) &range, sizeof(range)); xbuf_add_data(&user_prt_array, (unsigned char *) &range, sizeof(range)); break; case 'p': case '.': xbuf_add_data(&user_prt_array, (unsigned char *) &range, sizeof(range)); break; case '\0': s--; break; default: /* Ignore unknown character attribute. */ break; } if (s[0] == ',') ++s; } } wchar_range_table_set(&user_wide_table, &user_wide_array); wchar_range_table_set(&user_ubin_table, &user_ubin_array); wchar_range_table_set(&user_compose_table, &user_compose_array); wchar_range_table_set(&user_prt_table, &user_prt_array); } /* * Define a charset, given a description string. * The string consists of 256 letters, * one for each character in the charset. * If the string is shorter than 256 letters, missing letters * are taken to be identical to the last one. * A decimal number followed by a letter is taken to be a * repetition of the letter. * * Each letter is one of: * . normal character * b binary character * c control character */ static void ichardef(char *s) { char *cp; int n; char v; n = 0; v = 0; cp = chardef; while (*s != '\0') { switch (*s++) { case '.': v = 0; break; case 'c': v = IS_CONTROL_CHAR; break; case 'b': v = IS_BINARY_CHAR|IS_CONTROL_CHAR; break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': if (ckd_mul(&n, n, 10) || ckd_add(&n, n, s[-1] - '0')) goto invalid_chardef; continue; default: invalid_chardef: error("invalid chardef", NULL_PARG); quit(QUIT_ERROR); /*NOTREACHED*/ } do { if (cp >= chardef + sizeof(chardef)) { error("chardef longer than 256", NULL_PARG); quit(QUIT_ERROR); /*NOTREACHED*/ } *cp++ = v; } while (--n > 0); n = 0; } while (cp < chardef + sizeof(chardef)) *cp++ = v; } /* * Define a charset, given a charset name. * The valid charset names are listed in the "charsets" array. */ static int icharset(char *name, int no_error) { struct charset *p; struct cs_alias *a; if (name == NULL || *name == '\0') return (0); /* First see if the name is an alias. */ for (a = cs_aliases; a->name != NULL; a++) { if (strcmp(name, a->name) == 0) { name = a->oname; break; } } for (p = charsets; p->name != NULL; p++) { if (strcmp(name, p->name) == 0) { ichardef(p->desc); if (p->p_flag != NULL) { #if MSDOS_COMPILER==WIN32C *(p->p_flag) = 1 + (GetConsoleOutputCP() != CP_UTF8); #else *(p->p_flag) = 1; #endif } return (1); } } if (!no_error) { error("invalid charset name", NULL_PARG); quit(QUIT_ERROR); } return (0); } #if HAVE_LOCALE /* * Define a charset, given a locale name. */ static void ilocale(void) { int c; for (c = 0; c < (int) sizeof(chardef); c++) { if (isprint(c)) chardef[c] = 0; else if (iscntrl(c)) chardef[c] = IS_CONTROL_CHAR; else chardef[c] = IS_BINARY_CHAR|IS_CONTROL_CHAR; } } #endif /* * Define the printing format for control (or binary utf) chars. */ public void setfmt(char *s, char **fmtvarptr, int *attrptr, char *default_fmt, int for_printf) { if (s && utf_mode) { /* It would be too hard to account for width otherwise. */ char constant *t = s; while (*t) { if (*t < ' ' || *t > '~') { s = default_fmt; goto attr; } t++; } } if (s == NULL || *s == '\0') s = default_fmt; else if (for_printf && ((*s == '*' && (s[1] == '\0' || s[2] == '\0' || strchr(s + 2, 'n'))) || (*s != '*' && strchr(s, 'n')))) /* %n is evil */ s = default_fmt; /* * Select the attributes if it starts with "*". */ attr: if (*s == '*' && s[1] != '\0') { switch (s[1]) { case 'd': *attrptr = AT_BOLD; break; case 'k': *attrptr = AT_BLINK; break; case 's': *attrptr = AT_STANDOUT; break; case 'u': *attrptr = AT_UNDERLINE; break; default: *attrptr = AT_NORMAL; break; } s += 2; } *fmtvarptr = s; } /* * */ static void set_charset(void) { char *s; #if MSDOS_COMPILER==WIN32C /* * If the Windows console is using UTF-8, we'll use it too. */ if (GetConsoleOutputCP() == CP_UTF8) if (icharset("utf-8", 1)) return; #endif ichardef_utf(lgetenv("LESSUTFCHARDEF")); /* * See if environment variable LESSCHARSET is defined. */ s = lgetenv("LESSCHARSET"); if (icharset(s, 0)) return; /* * LESSCHARSET is not defined: try LESSCHARDEF. */ s = lgetenv("LESSCHARDEF"); if (!isnullenv(s)) { ichardef(s); return; } #if HAVE_LOCALE #ifdef CODESET /* * Try using the codeset name as the charset name. */ s = nl_langinfo(CODESET); if (icharset(s, 1)) return; #endif #endif #if HAVE_STRSTR /* * Check whether LC_ALL, LC_CTYPE or LANG look like UTF-8 is used. */ if ((s = lgetenv("LC_ALL")) != NULL || (s = lgetenv("LC_CTYPE")) != NULL || (s = lgetenv("LANG")) != NULL) { if ( strstr(s, "UTF-8") != NULL || strstr(s, "utf-8") != NULL || strstr(s, "UTF8") != NULL || strstr(s, "utf8") != NULL) if (icharset("utf-8", 1)) return; } #endif #if HAVE_LOCALE /* * Get character definitions from locale functions, * rather than from predefined charset entry. */ ilocale(); #else #if MSDOS_COMPILER /* * Default to "dos". */ (void) icharset("dos", 1); #else /* * Default to "latin1". */ (void) icharset("latin1", 1); #endif #endif } /* * Initialize charset data structures. */ public void init_charset(void) { char *s; #if HAVE_LOCALE setlocale(LC_ALL, ""); #endif set_charset(); s = lgetenv("LESSBINFMT"); setfmt(s, &binfmt, &binattr, "*s<%02X>", TRUE); s = lgetenv("LESSUTFBINFMT"); setfmt(s, &utfbinfmt, &binattr, "<U+%04lX>", TRUE); } /* * Is a given character a "binary" character? */ public int binary_char(LWCHAR c) { if (utf_mode) return (is_ubin_char(c)); c &= 0377; return (chardef[c] & IS_BINARY_CHAR); } /* * Is a given character a "control" character? */ public int control_char(LWCHAR c) { c &= 0377; return (chardef[c] & IS_CONTROL_CHAR); } /* * Return the printable form of a character. * For example, in the "ascii" charset '\3' is printed as "^C". */ public char * prchar(LWCHAR c) { /* {{ This buffer can be overrun if LESSBINFMT is a long string. }} */ static char buf[MAX_PRCHAR_LEN+1]; c &= 0377; if ((c < 128 || !utf_mode) && !control_char(c)) SNPRINTF1(buf, sizeof(buf), "%c", (int) c); else if (c == ESC) strcpy(buf, "ESC"); #if IS_EBCDIC_HOST else if (!binary_char(c) && c < 64) SNPRINTF1(buf, sizeof(buf), "^%c", /* * This array roughly inverts CONTROL() #defined in less.h, * and should be kept in sync with CONTROL() and IBM-1047. */ "@ABC.I.?...KLMNO" "PQRS.JH.XY.." "\\]^_" "......W[.....EFG" "..V....D....TU.Z"[c]); #else else if (c < 128 && !control_char(c ^ 0100)) SNPRINTF1(buf, sizeof(buf), "^%c", (int) (c ^ 0100)); #endif else SNPRINTF1(buf, sizeof(buf), binfmt, c); return (buf); } /* * Return the printable form of a UTF-8 character. */ public char * prutfchar(LWCHAR ch) { static char buf[MAX_PRCHAR_LEN+1]; if (ch == ESC) strcpy(buf, "ESC"); else if (ch < 128 && control_char(ch)) { if (!control_char(ch ^ 0100)) SNPRINTF1(buf, sizeof(buf), "^%c", ((char) ch) ^ 0100); else SNPRINTF1(buf, sizeof(buf), binfmt, (char) ch); } else if (is_ubin_char(ch)) { SNPRINTF1(buf, sizeof(buf), utfbinfmt, ch); } else { char *p = buf; if (ch >= 0x80000000) ch = 0xFFFD; /* REPLACEMENT CHARACTER */ put_wchar(&p, ch); *p = '\0'; } return (buf); } /* * Get the length of a UTF-8 character in bytes. */ public int utf_len(int ch) { if ((ch & 0x80) == 0) return 1; if ((ch & 0xE0) == 0xC0) return 2; if ((ch & 0xF0) == 0xE0) return 3; if ((ch & 0xF8) == 0xF0) return 4; if ((ch & 0xFC) == 0xF8) return 5; if ((ch & 0xFE) == 0xFC) return 6; /* Invalid UTF-8 encoding. */ return 1; } /* * Does the parameter point to the lead byte of a well-formed UTF-8 character? */ public int is_utf8_well_formed(char *ss, int slen) { int i; int len; unsigned char *s = (unsigned char *) ss; if (IS_UTF8_INVALID(s[0])) return (0); len = utf_len(s[0]); if (len > slen) return (0); if (len == 1) return (1); if (len == 2) { if (s[0] < 0xC2) return (0); } else { unsigned char mask; mask = (~((1 << (8-len)) - 1)) & 0xFF; if (s[0] == mask && (s[1] & mask) == 0x80) return (0); } for (i = 1; i < len; i++) if (!IS_UTF8_TRAIL(s[i])) return (0); return (1); } /* * Skip bytes until a UTF-8 lead byte (11xxxxxx) or ASCII byte (0xxxxxxx) is found. */ public void utf_skip_to_lead(char **pp, char *limit) { do { ++(*pp); } while (*pp < limit && !IS_UTF8_LEAD((*pp)[0] & 0377) && !IS_ASCII_OCTET((*pp)[0])); } /* * Get the value of a UTF-8 character. */ public LWCHAR get_wchar(constant char *p) { switch (utf_len(p[0])) { case 1: default: /* 0xxxxxxx */ return (LWCHAR) (p[0] & 0xFF); case 2: /* 110xxxxx 10xxxxxx */ return (LWCHAR) ( ((p[0] & 0x1F) << 6) | (p[1] & 0x3F)); case 3: /* 1110xxxx 10xxxxxx 10xxxxxx */ return (LWCHAR) ( ((p[0] & 0x0F) << 12) | ((p[1] & 0x3F) << 6) | (p[2] & 0x3F)); case 4: /* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ return (LWCHAR) ( ((p[0] & 0x07) << 18) | ((p[1] & 0x3F) << 12) | ((p[2] & 0x3F) << 6) | (p[3] & 0x3F)); case 5: /* 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ return (LWCHAR) ( ((p[0] & 0x03) << 24) | ((p[1] & 0x3F) << 18) | ((p[2] & 0x3F) << 12) | ((p[3] & 0x3F) << 6) | (p[4] & 0x3F)); case 6: /* 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ return (LWCHAR) ( ((p[0] & 0x01) << 30) | ((p[1] & 0x3F) << 24) | ((p[2] & 0x3F) << 18) | ((p[3] & 0x3F) << 12) | ((p[4] & 0x3F) << 6) | (p[5] & 0x3F)); } } /* * Store a character into a UTF-8 string. */ public void put_wchar(char **pp, LWCHAR ch) { if (!utf_mode || ch < 0x80) { /* 0xxxxxxx */ *(*pp)++ = (char) ch; } else if (ch < 0x800) { /* 110xxxxx 10xxxxxx */ *(*pp)++ = (char) (0xC0 | ((ch >> 6) & 0x1F)); *(*pp)++ = (char) (0x80 | (ch & 0x3F)); } else if (ch < 0x10000) { /* 1110xxxx 10xxxxxx 10xxxxxx */ *(*pp)++ = (char) (0xE0 | ((ch >> 12) & 0x0F)); *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); *(*pp)++ = (char) (0x80 | (ch & 0x3F)); } else if (ch < 0x200000) { /* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ *(*pp)++ = (char) (0xF0 | ((ch >> 18) & 0x07)); *(*pp)++ = (char) (0x80 | ((ch >> 12) & 0x3F)); *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); *(*pp)++ = (char) (0x80 | (ch & 0x3F)); } else if (ch < 0x4000000) { /* 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ *(*pp)++ = (char) (0xF0 | ((ch >> 24) & 0x03)); *(*pp)++ = (char) (0x80 | ((ch >> 18) & 0x3F)); *(*pp)++ = (char) (0x80 | ((ch >> 12) & 0x3F)); *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); *(*pp)++ = (char) (0x80 | (ch & 0x3F)); } else { /* 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ *(*pp)++ = (char) (0xF0 | ((ch >> 30) & 0x01)); *(*pp)++ = (char) (0x80 | ((ch >> 24) & 0x3F)); *(*pp)++ = (char) (0x80 | ((ch >> 18) & 0x3F)); *(*pp)++ = (char) (0x80 | ((ch >> 12) & 0x3F)); *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); *(*pp)++ = (char) (0x80 | (ch & 0x3F)); } } /* * Step forward or backward one character in a string. */ public LWCHAR step_char(char **pp, signed int dir, constant char *limit) { LWCHAR ch; int len; char *p = *pp; if (!utf_mode) { /* It's easy if chars are one byte. */ if (dir > 0) ch = (LWCHAR) (unsigned char) ((p < limit) ? *p++ : 0); else ch = (LWCHAR) (unsigned char) ((p > limit) ? *--p : 0); } else if (dir > 0) { len = utf_len(*p); if (p + len > limit) { ch = 0; p = (char *) limit; } else { ch = get_wchar(p); p += len; } } else { while (p > limit && IS_UTF8_TRAIL(p[-1])) p--; if (p > limit) ch = get_wchar(--p); else ch = 0; } *pp = p; return ch; } /* * Unicode characters data * Actual data is in the generated *.uni files. */ #define DECLARE_RANGE_TABLE_START(name) \ static struct wchar_range name##_array[] = { #define DECLARE_RANGE_TABLE_END(name) \ }; struct wchar_range_table name##_table = { name##_array, sizeof(name##_array)/sizeof(*name##_array) }; DECLARE_RANGE_TABLE_START(compose) #include "compose.uni" DECLARE_RANGE_TABLE_END(compose) DECLARE_RANGE_TABLE_START(ubin) #include "ubin.uni" DECLARE_RANGE_TABLE_END(ubin) DECLARE_RANGE_TABLE_START(wide) #include "wide.uni" DECLARE_RANGE_TABLE_END(wide) DECLARE_RANGE_TABLE_START(fmt) #include "fmt.uni" DECLARE_RANGE_TABLE_END(fmt) /* comb_table is special pairs, not ranges. */ static struct wchar_range comb_table[] = { {0x0644,0x0622}, {0x0644,0x0623}, {0x0644,0x0625}, {0x0644,0x0627}, }; static int is_in_table(LWCHAR ch, struct wchar_range_table *table) { int hi; int lo; /* Binary search in the table. */ if (table->table == NULL || table->count == 0 || ch < table->table[0].first) return 0; lo = 0; hi = table->count - 1; while (lo <= hi) { int mid = (lo + hi) / 2; if (ch > table->table[mid].last) lo = mid + 1; else if (ch < table->table[mid].first) hi = mid - 1; else return 1; } return 0; } /* * Is a character a UTF-8 composing character? * If a composing character follows any char, the two combine into one glyph. */ public int is_composing_char(LWCHAR ch) { if (is_in_table(ch, &user_prt_table)) return 0; return is_in_table(ch, &user_compose_table) || is_in_table(ch, &compose_table) || (bs_mode != BS_CONTROL && is_in_table(ch, &fmt_table)); } /* * Should this UTF-8 character be treated as binary? */ public int is_ubin_char(LWCHAR ch) { if (is_in_table(ch, &user_prt_table)) return 0; return is_in_table(ch, &user_ubin_table) || is_in_table(ch, &ubin_table) || (bs_mode == BS_CONTROL && is_in_table(ch, &fmt_table)); } /* * Is this a double width UTF-8 character? */ public int is_wide_char(LWCHAR ch) { return is_in_table(ch, &user_wide_table) || is_in_table(ch, &wide_table); } /* * Is a character a UTF-8 combining character? * A combining char acts like an ordinary char, but if it follows * a specific char (not any char), the two combine into one glyph. */ public int is_combining_char(LWCHAR ch1, LWCHAR ch2) { /* The table is small; use linear search. */ int i; for (i = 0; i < sizeof(comb_table)/sizeof(*comb_table); i++) { if (ch1 == comb_table[i].first && ch2 == comb_table[i].last) return 1; } return 0; }