X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=ncurses%2Ftinfo%2Fread_entry.c;h=fc360bb8e4d8a1ec96bac921100996ed6c3b274a;hp=deef49859a3e482d2a9fbe92d9a204708a1b8d33;hb=ce4803687b821efbc5fb2c5a5f06d69cd4dc2656;hpb=c633e5103a29a38532cf1925257b91cea33fd090 diff --git a/ncurses/tinfo/read_entry.c b/ncurses/tinfo/read_entry.c index deef4985..fc360bb8 100644 --- a/ncurses/tinfo/read_entry.c +++ b/ncurses/tinfo/read_entry.c @@ -1,5 +1,5 @@ /**************************************************************************** - * Copyright (c) 1998,1999,2000 Free Software Foundation, Inc. * + * Copyright (c) 1998-2016,2017 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * @@ -29,77 +29,25 @@ /**************************************************************************** * Author: Zeyd M. Ben-Halim 1992,1995 * * and: Eric S. Raymond * + * and: Thomas E. Dickey 1996-on * ****************************************************************************/ /* * read_entry.c -- Routine for reading in a compiled terminfo file - * */ #include +#include #include -#include - -MODULE_ID("$Id: read_entry.c,v 1.69 2000/10/10 00:57:40 Todd.Miller Exp $") - -#if !HAVE_TELL -#define tell(fd) 0 /* lseek() is POSIX, but not tell() - odd... */ -#endif - -/* - * int - * _nc_read_file_entry(filename, ptr) - * - * Read the compiled terminfo entry in the given file into the - * structure pointed to by ptr, allocating space for the string - * table. - */ -#undef BYTE -#define BYTE(p,n) (unsigned char)((p)[n]) +MODULE_ID("$Id: read_entry.c,v 1.141 2017/02/18 23:39:22 tom Exp $") -#define IS_NEG1(p) ((BYTE(p,0) == 0377) && (BYTE(p,1) == 0377)) -#define IS_NEG2(p) ((BYTE(p,0) == 0376) && (BYTE(p,1) == 0377)) -#define LOW_MSB(p) (BYTE(p,0) + 256*BYTE(p,1)) +#define TYPE_CALLOC(type,elts) typeCalloc(type, (unsigned)(elts)) -static bool have_tic_directory = FALSE; -static bool keep_tic_directory = FALSE; - -/* - * Record the "official" location of the terminfo directory, according to - * the place where we're writing to, or the normal default, if not. - */ -const char * -_nc_tic_dir(const char *path) -{ - static const char *result = TERMINFO; - - if (!keep_tic_directory) { - if (path != 0) { - result = path; - have_tic_directory = TRUE; - } else if (!have_tic_directory && use_terminfo_vars()) { - char *envp; - if ((envp = getenv("TERMINFO")) != 0) - return _nc_tic_dir(envp); - } - } - return result; -} - -/* - * Special fix to prevent the terminfo directory from being moved after tic - * has chdir'd to it. If we let it be changed, then if $TERMINFO has a - * relative path, we'll lose track of the actual directory. - */ -void -_nc_keep_tic_dir(const char *path) -{ - _nc_tic_dir(path); - keep_tic_directory = TRUE; -} +#define MyNumber(n) (short) LOW_MSB(n) +#if NCURSES_USE_DATABASE static void convert_shorts(char *buf, short *Numbers, int count) { @@ -110,7 +58,7 @@ convert_shorts(char *buf, short *Numbers, int count) else if (IS_NEG2(buf + 2 * i)) Numbers[i] = CANCELLED_NUMERIC; else - Numbers[i] = LOW_MSB(buf + 2 * i); + Numbers[i] = MyNumber(buf + 2 * i); TR(TRACE_DATABASE, ("get Numbers[%d]=%d", i, Numbers[i])); } } @@ -126,10 +74,10 @@ convert_strings(char *buf, char **Strings, int count, int size, char *table) Strings[i] = ABSENT_STRING; } else if (IS_NEG2(buf + 2 * i)) { Strings[i] = CANCELLED_STRING; - } else if (LOW_MSB(buf + 2 * i) > size) { + } else if (MyNumber(buf + 2 * i) > size) { Strings[i] = ABSENT_STRING; } else { - Strings[i] = (LOW_MSB(buf + 2 * i) + table); + Strings[i] = (MyNumber(buf + 2 * i) + table); TR(TRACE_DATABASE, ("Strings[%d] = %s", i, _nc_visbuf(Strings[i]))); } @@ -145,35 +93,111 @@ convert_strings(char *buf, char **Strings, int count, int size, char *table) } } -#define read_shorts(fd, buf, count) (read(fd, buf, (count)*2) == (count)*2) +static int +fake_read(char *src, int *offset, int limit, char *dst, unsigned want) +{ + int have = (limit - *offset); + + if (have > 0) { + if ((int) want > have) + want = (unsigned) have; + memcpy(dst, src + *offset, (size_t) want); + *offset += (int) want; + } else { + want = 0; + } + return (int) want; +} + +#define Read(buf, count) fake_read(buffer, &offset, limit, (char *) buf, (unsigned) count) + +#define read_shorts(buf, count) \ + (Read(buf, (count)*2) == (int) (count)*2) #define even_boundary(value) \ - if ((value) % 2 != 0) read(fd, buf, 1) + if ((value) % 2 != 0) Read(buf, 1) +#endif -static int -read_termtype(int fd, TERMTYPE * ptr) -/* return 1 if read, 0 if not found or garbled */ +NCURSES_EXPORT(void) +_nc_init_termtype(TERMTYPE *const tp) +{ + unsigned i; + +#if NCURSES_XNAMES + tp->num_Booleans = BOOLCOUNT; + tp->num_Numbers = NUMCOUNT; + tp->num_Strings = STRCOUNT; + tp->ext_Booleans = 0; + tp->ext_Numbers = 0; + tp->ext_Strings = 0; +#endif + if (tp->Booleans == 0) + TYPE_MALLOC(NCURSES_SBOOL, BOOLCOUNT, tp->Booleans); + if (tp->Numbers == 0) + TYPE_MALLOC(short, NUMCOUNT, tp->Numbers); + if (tp->Strings == 0) + TYPE_MALLOC(char *, STRCOUNT, tp->Strings); + + for_each_boolean(i, tp) + tp->Booleans[i] = FALSE; + + for_each_number(i, tp) + tp->Numbers[i] = ABSENT_NUMERIC; + + for_each_string(i, tp) + tp->Strings[i] = ABSENT_STRING; +} + +#if NCURSES_USE_DATABASE +#if NCURSES_XNAMES +static bool +valid_shorts(char *buffer, int limit) +{ + bool result = FALSE; + int n; + for (n = 0; n < limit; ++n) { + if (MyNumber(buffer + (n * 2)) > 0) { + result = TRUE; + break; + } + } + return result; +} +#endif + +/* + * Return TGETENT_YES if read, TGETENT_NO if not found or garbled. + */ +NCURSES_EXPORT(int) +_nc_read_termtype(TERMTYPE *ptr, char *buffer, int limit) { + int offset = 0; int name_size, bool_count, num_count, str_count, str_size; int i; - char buf[MAX_ENTRY_SIZE]; + char buf[MAX_ENTRY_SIZE + 2]; + char *string_table; + unsigned want, have; - TR(TRACE_DATABASE, ("READ termtype header @%d", tell(fd))); + TR(TRACE_DATABASE, + (T_CALLED("_nc_read_termtype(ptr=%p, buffer=%p, limit=%d)"), + ptr, buffer, limit)); + + TR(TRACE_DATABASE, ("READ termtype header @%d", offset)); memset(ptr, 0, sizeof(*ptr)); /* grab the header */ - if (!read_shorts(fd, buf, 6) - || LOW_MSB(buf) != MAGIC) { - return (0); + if (!read_shorts(buf, 6) + || !IS_TIC_MAGIC(buf)) { + returnDB(TGETENT_NO); } - _nc_free_termtype(ptr); - name_size = LOW_MSB(buf + 2); - bool_count = LOW_MSB(buf + 4); - num_count = LOW_MSB(buf + 6); - str_count = LOW_MSB(buf + 8); - str_size = LOW_MSB(buf + 10); + /* *INDENT-EQLS* */ + name_size = MyNumber(buf + 2); + bool_count = MyNumber(buf + 4); + num_count = MyNumber(buf + 6); + str_count = MyNumber(buf + 8); + str_size = MyNumber(buf + 10); TR(TRACE_DATABASE, ("TERMTYPE name_size=%d, bool=%d/%d, num=%d/%d str=%d/%d(%d)", @@ -184,34 +208,34 @@ read_termtype(int fd, TERMTYPE * ptr) || num_count < 0 || str_count < 0 || str_size < 0) { - return (0); + returnDB(TGETENT_NO); } - if (str_size) { - /* try to allocate space for the string table */ - if (str_count * 2 >= (int) sizeof(buf) - || (ptr->str_table = typeMalloc(char, (unsigned) str_size)) == 0) { - return (0); - } - } else { - str_count = 0; + want = (unsigned) (str_size + name_size + 1); + /* try to allocate space for the string table */ + if (str_count * 2 >= MAX_ENTRY_SIZE + || (string_table = typeMalloc(char, want)) == 0) { + returnDB(TGETENT_NO); } - /* grab the name (a null-terminate string) */ - read(fd, buf, min(MAX_NAME_SIZE, (unsigned) name_size)); - buf[MAX_NAME_SIZE] = '\0'; - ptr->term_names = typeCalloc(char, strlen(buf) + 1); - if (ptr->term_names == NULL) { - return (0); + /* grab the name (a null-terminated string) */ + want = min(MAX_NAME_SIZE, (unsigned) name_size); + ptr->str_table = string_table; + ptr->term_names = string_table; + if ((have = (unsigned) Read(ptr->term_names, want)) != want) { + memset(ptr->term_names + have, 0, (size_t) (want - have)); } - (void) strcpy(ptr->term_names, buf); - if (name_size > MAX_NAME_SIZE) - lseek(fd, (off_t) (name_size - MAX_NAME_SIZE), 1); + ptr->term_names[want] = '\0'; + string_table += (want + 1); + + if (have > MAX_NAME_SIZE) + offset = (int) (have - MAX_NAME_SIZE); /* grab the booleans */ - if ((ptr->Booleans = typeCalloc(char, max(BOOLCOUNT, bool_count))) == 0 - || read(fd, ptr->Booleans, (unsigned) bool_count) < bool_count) { - return (0); + if ((ptr->Booleans = TYPE_CALLOC(NCURSES_SBOOL, + max(BOOLCOUNT, bool_count))) == 0 + || Read(ptr->Booleans, (unsigned) bool_count) < bool_count) { + returnDB(TGETENT_NO); } /* @@ -223,24 +247,26 @@ read_termtype(int fd, TERMTYPE * ptr) even_boundary(name_size + bool_count); /* grab the numbers */ - if ((ptr->Numbers = typeCalloc(short, max(NUMCOUNT, num_count))) == 0 - || !read_shorts(fd, buf, num_count)) { - return (0); + if ((ptr->Numbers = TYPE_CALLOC(short, max(NUMCOUNT, num_count))) == 0 + || !read_shorts(buf, num_count)) { + returnDB(TGETENT_NO); } convert_shorts(buf, ptr->Numbers, num_count); - if ((ptr->Strings = typeCalloc(char *, max(STRCOUNT, str_count))) == 0) - return (0); + if ((ptr->Strings = TYPE_CALLOC(char *, max(STRCOUNT, str_count))) == 0) { + returnDB(TGETENT_NO); + } if (str_count) { /* grab the string offsets */ - if (!read_shorts(fd, buf, str_count)) { - return (0); + if (!read_shorts(buf, str_count)) { + returnDB(TGETENT_NO); } /* finally, grab the string table itself */ - if (read(fd, ptr->str_table, (unsigned) str_size) != str_size) - return (0); - convert_strings(buf, ptr->Strings, str_count, str_size, ptr->str_table); + if (Read(string_table, (unsigned) str_size) != str_size) { + returnDB(TGETENT_NO); + } + convert_strings(buf, ptr->Strings, str_count, str_size, string_table); } #if NCURSES_XNAMES @@ -252,73 +278,83 @@ read_termtype(int fd, TERMTYPE * ptr) * Read extended entries, if any, after the normal end of terminfo data. */ even_boundary(str_size); - TR(TRACE_DATABASE, ("READ extended_header @%d", tell(fd))); - if (_nc_user_definable && read_shorts(fd, buf, 5)) { - int ext_bool_count = LOW_MSB(buf + 0); - int ext_num_count = LOW_MSB(buf + 2); - int ext_str_count = LOW_MSB(buf + 4); - int ext_str_size = LOW_MSB(buf + 6); - int ext_str_limit = LOW_MSB(buf + 8); - int need = (ext_bool_count + ext_num_count + ext_str_count); + TR(TRACE_DATABASE, ("READ extended_header @%d", offset)); + if (_nc_user_definable && read_shorts(buf, 5) && valid_shorts(buf, 5)) { + int ext_bool_count = MyNumber(buf + 0); + int ext_num_count = MyNumber(buf + 2); + int ext_str_count = MyNumber(buf + 4); + int ext_str_size = MyNumber(buf + 6); + int ext_str_limit = MyNumber(buf + 8); + unsigned need = (unsigned) (ext_bool_count + ext_num_count + ext_str_count); int base = 0; - if (need >= (int) sizeof(buf) - || ext_str_size >= (int) sizeof(buf) - || ext_str_limit >= (int) sizeof(buf) + if (need >= (MAX_ENTRY_SIZE / 2) + || ext_str_size >= MAX_ENTRY_SIZE + || ext_str_limit >= MAX_ENTRY_SIZE || ext_bool_count < 0 || ext_num_count < 0 || ext_str_count < 0 || ext_str_size < 0 - || ext_str_limit < 0) - return (0); + || ext_str_limit < 0) { + returnDB(TGETENT_NO); + } - ptr->num_Booleans = BOOLCOUNT + ext_bool_count; - ptr->num_Numbers = NUMCOUNT + ext_num_count; - ptr->num_Strings = STRCOUNT + ext_str_count; + ptr->num_Booleans = UShort(BOOLCOUNT + ext_bool_count); + ptr->num_Numbers = UShort(NUMCOUNT + ext_num_count); + ptr->num_Strings = UShort(STRCOUNT + ext_str_count); - ptr->Booleans = typeRealloc(char, ptr->num_Booleans, ptr->Booleans); - ptr->Numbers = typeRealloc(short, ptr->num_Numbers, ptr->Numbers); - ptr->Strings = typeRealloc(char *, ptr->num_Strings, ptr->Strings); + TYPE_REALLOC(NCURSES_SBOOL, ptr->num_Booleans, ptr->Booleans); + TYPE_REALLOC(short, ptr->num_Numbers, ptr->Numbers); + TYPE_REALLOC(char *, ptr->num_Strings, ptr->Strings); TR(TRACE_DATABASE, ("extended header is %d/%d/%d(%d:%d)", ext_bool_count, ext_num_count, ext_str_count, ext_str_size, ext_str_limit)); TR(TRACE_DATABASE, ("READ %d extended-booleans @%d", - ext_bool_count, tell(fd))); - if ((ptr->ext_Booleans = ext_bool_count) != 0) { - if (read(fd, ptr->Booleans + BOOLCOUNT, (unsigned) - ext_bool_count) != ext_bool_count) - return (0); + ext_bool_count, offset)); + if ((ptr->ext_Booleans = UShort(ext_bool_count)) != 0) { + if (Read(ptr->Booleans + BOOLCOUNT, (unsigned) + ext_bool_count) != ext_bool_count) { + returnDB(TGETENT_NO); + } } even_boundary(ext_bool_count); TR(TRACE_DATABASE, ("READ %d extended-numbers @%d", - ext_num_count, tell(fd))); - if ((ptr->ext_Numbers = ext_num_count) != 0) { - if (!read_shorts(fd, buf, ext_num_count)) - return (0); + ext_num_count, offset)); + if ((ptr->ext_Numbers = UShort(ext_num_count)) != 0) { + if (!read_shorts(buf, ext_num_count)) { + returnDB(TGETENT_NO); + } TR(TRACE_DATABASE, ("Before converting extended-numbers")); convert_shorts(buf, ptr->Numbers + NUMCOUNT, ext_num_count); } - TR(TRACE_DATABASE, ("READ extended-offsets @%d", tell(fd))); + TR(TRACE_DATABASE, ("READ extended-offsets @%d", offset)); + if ((unsigned) (ext_str_count + (int) need) >= (MAX_ENTRY_SIZE / 2)) { + returnDB(TGETENT_NO); + } if ((ext_str_count || need) - && !read_shorts(fd, buf, ext_str_count + need)) - return (0); + && !read_shorts(buf, ext_str_count + (int) need)) { + returnDB(TGETENT_NO); + } TR(TRACE_DATABASE, ("READ %d bytes of extended-strings @%d", - ext_str_limit, tell(fd))); + ext_str_limit, offset)); if (ext_str_limit) { - if ((ptr->ext_str_table = typeMalloc(char, ext_str_limit)) == 0) - return (0); - if (read(fd, ptr->ext_str_table, ext_str_limit) != ext_str_limit) - return (0); + ptr->ext_str_table = typeMalloc(char, (size_t) ext_str_limit); + if (ptr->ext_str_table == 0) { + returnDB(TGETENT_NO); + } + if (Read(ptr->ext_str_table, (unsigned) ext_str_limit) != ext_str_limit) { + returnDB(TGETENT_NO); + } TR(TRACE_DATABASE, ("first extended-string is %s", _nc_visbuf(ptr->ext_str_table))); } - if ((ptr->ext_Strings = ext_str_count) != 0) { + if ((ptr->ext_Strings = UShort(ext_str_count)) != 0) { TR(TRACE_DATABASE, ("Before computing extended-string capabilities str_count=%d, ext_str_count=%d", str_count, ext_str_count)); @@ -330,7 +366,7 @@ read_termtype(int fd, TERMTYPE * ptr) _nc_visbuf(ptr->Strings[i + str_count]))); ptr->Strings[i + STRCOUNT] = ptr->Strings[i + str_count]; if (VALID_STRING(ptr->Strings[i + STRCOUNT])) - base += (strlen(ptr->Strings[i + STRCOUNT]) + 1); + base += (int) (strlen(ptr->Strings[i + STRCOUNT]) + 1); TR(TRACE_DATABASE, ("... to [%d] %s", i + STRCOUNT, _nc_visbuf(ptr->Strings[i + STRCOUNT]))); @@ -338,26 +374,33 @@ read_termtype(int fd, TERMTYPE * ptr) } if (need) { - if ((ptr->ext_Names = typeCalloc(char *, need)) == 0) - return (0); + if (ext_str_count >= (MAX_ENTRY_SIZE / 2)) { + returnDB(TGETENT_NO); + } + if ((ptr->ext_Names = TYPE_CALLOC(char *, need)) == 0) { + returnDB(TGETENT_NO); + } TR(TRACE_DATABASE, ("ext_NAMES starting @%d in extended_strings, first = %s", base, _nc_visbuf(ptr->ext_str_table + base))); - convert_strings(buf + (2 * ext_str_count), ptr->ext_Names, need, + convert_strings(buf + (2 * ext_str_count), + ptr->ext_Names, + (int) need, ext_str_limit, ptr->ext_str_table + base); } - T(("...done reading terminfo bool %d(%d) num %d(%d) str %d(%d)", - ptr->num_Booleans, ptr->ext_Booleans, - ptr->num_Numbers, ptr->ext_Numbers, - ptr->num_Strings, ptr->ext_Strings)); + TR(TRACE_DATABASE, + ("...done reading terminfo bool %d(%d) num %d(%d) str %d(%d)", + ptr->num_Booleans, ptr->ext_Booleans, + ptr->num_Numbers, ptr->ext_Numbers, + ptr->num_Strings, ptr->ext_Strings)); TR(TRACE_DATABASE, ("extend: num_Booleans:%d", ptr->num_Booleans)); } else #endif /* NCURSES_XNAMES */ { - T(("...done reading terminfo bool %d num %d str %d", - bool_count, num_count, str_count)); + TR(TRACE_DATABASE, ("...done reading terminfo bool %d num %d str %d", + bool_count, num_count, str_count)); #if NCURSES_XNAMES TR(TRACE_DATABASE, ("normal: num_Booleans:%d", ptr->num_Booleans)); #endif @@ -370,85 +413,302 @@ read_termtype(int fd, TERMTYPE * ptr) for (i = str_count; i < STRCOUNT; i++) ptr->Strings[i] = ABSENT_STRING; - return (1); + returnDB(TGETENT_YES); } -int -_nc_read_file_entry(const char *const filename, TERMTYPE * ptr) +/* + * int + * _nc_read_file_entry(filename, ptr) + * + * Read the compiled terminfo entry in the given file into the + * structure pointed to by ptr, allocating space for the string + * table. + */ +NCURSES_EXPORT(int) +_nc_read_file_entry(const char *const filename, TERMTYPE *ptr) /* return 1 if read, 0 if not found or garbled */ { - int code, fd = -1; + FILE *fp = 0; + int code; if (_nc_access(filename, R_OK) < 0 - || (fd = open(filename, O_RDONLY | O_BINARY)) < 0) { - T(("cannot open terminfo %s (errno=%d)", filename, errno)); - return (0); - } + || (fp = fopen(filename, "rb")) == 0) { + TR(TRACE_DATABASE, ("cannot open terminfo %s (errno=%d)", filename, errno)); + code = TGETENT_NO; + } else { + int limit; + char buffer[MAX_ENTRY_SIZE + 1]; + + if ((limit = (int) fread(buffer, sizeof(char), sizeof(buffer), fp)) + > 0) { - T(("read terminfo %s", filename)); - if ((code = read_termtype(fd, ptr)) == 0) - _nc_free_termtype(ptr); - close(fd); + TR(TRACE_DATABASE, ("read terminfo %s", filename)); + if ((code = _nc_read_termtype(ptr, buffer, limit)) == TGETENT_NO) { + _nc_free_termtype(ptr); + } + } else { + code = TGETENT_NO; + } + fclose(fp); + } return (code); } +#if USE_HASHED_DB /* - * Build a terminfo pathname and try to read the data. Returns 1 on success, - * 0 on failure. + * Return if if we can build the filename of a ".db" file. */ -static int -_nc_read_tic_entry(char *const filename, - const char *const dir, const char *ttn, TERMTYPE * const tp) +static bool +make_db_filename(char *filename, unsigned limit, const char *const path) { -/* maximum safe length of terminfo root directory name */ -#define MAX_TPATH (PATH_MAX - MAX_ALIAS - 6) + static const char suffix[] = DBM_SUFFIX; - if (strlen(dir) > MAX_TPATH) - return 0; - (void) sprintf(filename, "%s/%s", dir, ttn); - return _nc_read_file_entry(filename, tp); + size_t lens = sizeof(suffix) - 1; + size_t size = strlen(path); + size_t test = lens + size; + bool result = FALSE; + + if (test < limit) { + if (size >= lens + && !strcmp(path + size - lens, suffix)) + _nc_STRCPY(filename, path, limit); + else + _nc_SPRINTF(filename, _nc_SLIMIT(limit) "%s%s", path, suffix); + result = TRUE; + } + return result; } +#endif /* - * Process the list of :-separated directories, looking for the terminal type. - * We don't use strtok because it does not show us empty tokens. + * Return true if we can build the name of a filesystem entry. */ +static bool +make_dir_filename(char *filename, + unsigned limit, + const char *const path, + const char *name) +{ + bool result = FALSE; + +#if NCURSES_USE_TERMCAP + if (_nc_is_dir_path(path)) +#endif + { + unsigned need = (unsigned) (LEAF_LEN + 3 + strlen(path) + strlen(name)); + + if (need <= limit) { + _nc_SPRINTF(filename, _nc_SLIMIT(limit) + "%s/" LEAF_FMT "/%s", path, *name, name); + result = TRUE; + } + } + return result; +} + +static int +lookup_b64(int *target, const char **source) +{ + int result = 3; + int j; + /* + * ncurses' quickdump writes only RFC 4648 "url/filename-safe" encoding, + * but accepts RFC-3548 + */ + for (j = 0; j < 4; ++j) { + int ch = UChar(**source); + *source += 1; + if (ch >= 'A' && ch <= 'Z') { + target[j] = (ch - 'A'); + } else if (ch >= 'a' && ch <= 'z') { + target[j] = 26 + (ch - 'a'); + } else if (ch >= '0' && ch <= '9') { + target[j] = 52 + (ch - '0'); + } else if (ch == '-' || ch == '+') { + target[j] = 62; + } else if (ch == '_' || ch == '/') { + target[j] = 63; + } else if (ch == '=') { + target[j] = 64; + result--; + } else { + result = -1; + break; + } + } + return result; +} + +static int +decode_hex(const char **source) +{ + int result = 0; + int nibble; + int ch; + + for (nibble = 0; nibble < 2; ++nibble) { + result <<= 4; + ch = UChar(**source); + *source += 1; + if (ch >= '0' && ch <= '9') { + ch -= '0'; + } else if (ch >= 'A' && ch <= 'F') { + ch -= 'A'; + ch += 10; + } else if (ch >= 'a' && ch <= 'f') { + ch -= 'a'; + ch += 10; + } else { + result = -1; + break; + } + result |= ch; + } + return result; +} + static int -_nc_read_terminfo_dirs(const char *dirs, char *const filename, const char *const - ttn, TERMTYPE * const tp) +decode_quickdump(char *target, const char *source) { - char *list, *a; - const char *b; - int code = 0; - - /* we'll modify the argument, so we must copy */ - if ((b = a = list = strdup(dirs)) == NULL) - return (0); - - for (;;) { - int c = *a; - if (c == 0 || c == ':') { - *a = 0; - if ((b + 1) >= a) - b = TERMINFO; - if (_nc_read_tic_entry(filename, b, ttn, tp) == 1) { - code = 1; + char *base = target; + int result = 0; + + if (!strncmp(source, "b64:", 4)) { + source += 4; + while (*source != '\0') { + int bits[4]; + int ch = lookup_b64(bits, &source); + if (ch < 0 || (ch + target - base) >= MAX_ENTRY_SIZE) { + result = 0; break; } - b = a + 1; - if (c == 0) + result += ch; + *target++ = (char) ((bits[0] << 2) | (bits[1] >> 4)); + if (bits[2] < 64) { + *target++ = (char) ((bits[1] << 4) | (bits[2] >> 2)); + if (bits[3] < 64) { + *target++ = (char) ((bits[2] << 6) | bits[3]); + } + } + } + } else if (!strncmp(source, "hex:", 4)) { + source += 4; + while (*source != '\0') { + int ch = decode_hex(&source); + if (ch < 0 || (target - base) >= MAX_ENTRY_SIZE) { + result = 0; break; + } + *target++ = (char) ch; + ++result; } - a++; } + return result; +} - free(list); - return (code); +/* + * Build a terminfo pathname and try to read the data. Returns TGETENT_YES on + * success, TGETENT_NO on failure. + */ +static int +_nc_read_tic_entry(char *filename, + unsigned limit, + const char *const path, + const char *name, + TERMTYPE *const tp) +{ + int code = TGETENT_NO; +#if USE_HASHED_DB + DB *capdbp; +#endif + char buffer[MAX_ENTRY_SIZE + 1]; + int used; + + TR(TRACE_DATABASE, + (T_CALLED("_nc_read_tic_entry(file=%p, path=%s, name=%s)"), + filename, path, name)); + + if ((used = decode_quickdump(buffer, path)) != 0 + && (code = _nc_read_termtype(tp, buffer, used)) == TGETENT_YES + && _nc_name_match(tp->term_names, name, "|")) { + TR(TRACE_DATABASE, ("loaded quick-dump for %s", name)); + } else +#if USE_HASHED_DB + if (make_db_filename(filename, limit, path) + && (capdbp = _nc_db_open(filename, FALSE)) != 0) { + + DBT key, data; + int reccnt = 0; + char *save = strdup(name); + + memset(&key, 0, sizeof(key)); + key.data = save; + key.size = strlen(save); + + /* + * This lookup could return termcap data, which we do not want. We are + * looking for compiled (binary) terminfo data. + * + * cgetent uses a two-level lookup. On the first it uses the given + * name to return a record containing only the aliases for an entry. + * On the second (using that list of aliases as a key), it returns the + * content of the terminal description. We expect second lookup to + * return data beginning with the same set of aliases. + * + * For compiled terminfo, the list of aliases in the second case will + * be null-terminated. A termcap entry will not be, and will run on + * into the description. So we can easily distinguish between the two + * (source/binary) by checking the lengths. + */ + while (_nc_db_get(capdbp, &key, &data) == 0) { + char *have = (char *) data.data; + used = (int) data.size - 1; + + if (*have++ == 0) { + if (data.size > key.size + && IS_TIC_MAGIC(have)) { + code = _nc_read_termtype(tp, have, used); + if (code == TGETENT_NO) { + _nc_free_termtype(tp); + } + } + break; + } + + /* + * Just in case we have a corrupt database, do not waste time with + * it. + */ + if (++reccnt >= 3) + break; + + /* + * Prepare for the second level. + */ + key.data = have; + key.size = used; + } + + free(save); + } else /* may be either filesystem or flat file */ +#endif + if (make_dir_filename(filename, limit, path, name)) { + code = _nc_read_file_entry(filename, tp); + } +#if NCURSES_USE_TERMCAP + else if (code != TGETENT_YES) { + code = _nc_read_termcap_entry(name, tp); + _nc_SPRINTF(filename, _nc_SLIMIT(PATH_MAX) + "%.*s", PATH_MAX - 1, _nc_get_source()); + } +#endif + returnDB(code); } +#endif /* NCURSES_USE_DATABASE */ /* - * _nc_read_entry(char *tn, char *filename, TERMTYPE *tp) + * _nc_read_entry(char *name, char *filename, TERMTYPE *tp) * * Find and read the compiled entry for a given terminal type, * if it exists. We take pains here to make sure no combination @@ -456,46 +716,42 @@ _nc_read_terminfo_dirs(const char *dirs, char *const filename, const char *const * overrun the file buffer. */ -int -_nc_read_entry(const char *const tn, char *const filename, TERMTYPE * const tp) +NCURSES_EXPORT(int) +_nc_read_entry(const char *const name, char *const filename, TERMTYPE *const tp) { - char *envp; - char ttn[MAX_ALIAS + 3]; + int code = TGETENT_NO; - /* truncate the terminal name to prevent dangerous buffer airline */ - (void) sprintf(ttn, "%c/%.*s", *tn, MAX_ALIAS, tn); + _nc_SPRINTF(filename, _nc_SLIMIT(PATH_MAX) + "%.*s", PATH_MAX - 1, name); - /* This is System V behavior, in conjunction with our requirements for - * writing terminfo entries. - */ - if (have_tic_directory - && _nc_read_tic_entry(filename, _nc_tic_dir(0), ttn, tp) == 1) - return 1; - - if (use_terminfo_vars()) { - if ((envp = getenv("TERMINFO")) != 0 - && _nc_read_tic_entry(filename, _nc_tic_dir(envp), ttn, tp) == 1) - return 1; - - /* this is an ncurses extension */ - if ((envp = _nc_home_terminfo()) != 0) { - if (_nc_read_tic_entry(filename, envp, ttn, tp) == 1) { - return (1); + if (strlen(name) == 0 + || strcmp(name, ".") == 0 + || strcmp(name, "..") == 0 + || _nc_pathlast(name) != 0 + || strchr(name, NCURSES_PATHSEP) != 0) { + TR(TRACE_DATABASE, ("illegal or missing entry name '%s'", name)); + } else { +#if NCURSES_USE_DATABASE + DBDIRS state; + int offset; + const char *path; + + _nc_first_db(&state, &offset); + code = TGETENT_ERR; + while ((path = _nc_next_db(&state, &offset)) != 0) { + code = _nc_read_tic_entry(filename, PATH_MAX, path, name, tp); + if (code == TGETENT_YES) { + _nc_last_db(); + break; } } - - /* this is an ncurses extension */ - if ((envp = getenv("TERMINFO_DIRS")) != 0) - return _nc_read_terminfo_dirs(envp, filename, ttn, tp); - } - - /* Try the system directory. Note that the TERMINFO_DIRS value, if - * defined by the configure script, begins with a ":", which will be - * interpreted as TERMINFO. - */ -#ifdef TERMINFO_DIRS - return _nc_read_terminfo_dirs(TERMINFO_DIRS, filename, ttn, tp); -#else - return _nc_read_tic_entry(filename, TERMINFO, ttn, tp); +#elif NCURSES_USE_TERMCAP + if (code != TGETENT_YES) { + code = _nc_read_termcap_entry(name, tp); + _nc_SPRINTF(filename, _nc_SLIMIT(PATH_MAX) + "%.*s", PATH_MAX - 1, _nc_get_source()); + } #endif + } + return code; }