diff options
Diffstat (limited to 'ncurses-5.9/ncurses/tinfo/trim_sgr0.c')
| -rw-r--r-- | ncurses-5.9/ncurses/tinfo/trim_sgr0.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/ncurses-5.9/ncurses/tinfo/trim_sgr0.c b/ncurses-5.9/ncurses/tinfo/trim_sgr0.c new file mode 100644 index 0000000..d270e33 --- /dev/null +++ b/ncurses-5.9/ncurses/tinfo/trim_sgr0.c @@ -0,0 +1,326 @@ +/**************************************************************************** + * Copyright (c) 2005-2007,2010 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 * + * "Software"), to deal in the Software without restriction, including * + * without limitation the rights to use, copy, modify, merge, publish, * + * distribute, distribute with modifications, sublicense, and/or sell * + * copies of the Software, and to permit persons to whom the Software is * + * furnished to do so, subject to the following conditions: * + * * + * The above copyright notice and this permission notice shall be included * + * in all copies or substantial portions of the Software. * + * * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * + * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * + * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * + * * + * Except as contained in this notice, the name(s) of the above copyright * + * holders shall not be used in advertising or otherwise to promote the * + * sale, use or other dealings in this Software without prior written * + * authorization. * + ****************************************************************************/ + +/**************************************************************************** + * Author: Thomas Dickey * + ****************************************************************************/ + +#include <curses.priv.h> + +#include <ctype.h> + +#include <tic.h> + +MODULE_ID("$Id$") + +#undef CUR +#define CUR tp-> + +#define CSI 233 +#define ESC 033 /* ^[ */ +#define L_BRACK '[' + +static char * +set_attribute_9(TERMTYPE *tp, int flag) +{ + const char *result; + + if ((result = tparm(set_attributes, 0, 0, 0, 0, 0, 0, 0, 0, flag)) == 0) + result = ""; + return strdup(result); +} + +static int +is_csi(const char *s) +{ + if (UChar(s[0]) == CSI) + return 1; + else if (s[0] == ESC && s[1] == L_BRACK) + return 2; + return 0; +} + +static char * +skip_zero(char *s) +{ + if (s[0] == '0') { + if (s[1] == ';') + s += 2; + else if (isalpha(UChar(s[1]))) + s += 1; + } + return s; +} + +static const char * +skip_delay(const char *s) +{ + if (s[0] == '$' && s[1] == '<') { + s += 2; + while (isdigit(UChar(*s)) || *s == '/') + ++s; + if (*s == '>') + ++s; + } + return s; +} + +/* + * Improve similar_sgr a little by moving the attr-string from the beginning + * to the end of the s-string. + */ +static bool +rewrite_sgr(char *s, char *attr) +{ + if (PRESENT(s)) { + if (PRESENT(attr)) { + size_t len_s = strlen(s); + size_t len_a = strlen(attr); + + if (len_s > len_a && !strncmp(attr, s, len_a)) { + unsigned n; + TR(TRACE_DATABASE, ("rewrite:\n\t%s", s)); + for (n = 0; n < len_s - len_a; ++n) { + s[n] = s[n + len_a]; + } + strcpy(s + n, attr); + TR(TRACE_DATABASE, ("to:\n\t%s", s)); + } + } + return TRUE; + } + return FALSE; /* oops */ +} + +static bool +similar_sgr(char *a, char *b) +{ + bool result = FALSE; + int csi_a = is_csi(a); + int csi_b = is_csi(b); + size_t len_a; + size_t len_b; + + TR(TRACE_DATABASE, ("similar_sgr:\n\t%s\n\t%s", + _nc_visbuf2(1, a), + _nc_visbuf2(2, b))); + if (csi_a != 0 && csi_b != 0 && csi_a == csi_b) { + a += csi_a; + b += csi_b; + if (*a != *b) { + a = skip_zero(a); + b = skip_zero(b); + } + } + len_a = strlen(a); + len_b = strlen(b); + if (len_a && len_b) { + if (len_a > len_b) + result = (strncmp(a, b, len_b) == 0); + else + result = (strncmp(a, b, len_a) == 0); + } + TR(TRACE_DATABASE, ("...similar_sgr: %d\n\t%s\n\t%s", result, + _nc_visbuf2(1, a), + _nc_visbuf2(2, b))); + return result; +} + +static unsigned +chop_out(char *string, unsigned i, unsigned j) +{ + TR(TRACE_DATABASE, ("chop_out %d..%d from %s", i, j, _nc_visbuf(string))); + while (string[j] != '\0') { + string[i++] = string[j++]; + } + string[i] = '\0'; + return i; +} + +/* + * Compare, ignoring delays. Some of the delay values are inconsistent, and + * we do not want to be stopped by that. + * + * Returns the number of chars from 'full' that we matched. If any mismatch + * occurs, return zero. + */ +static unsigned +compare_part(const char *part, const char *full) +{ + const char *next_part; + const char *next_full; + unsigned used_full = 0; + unsigned used_delay = 0; + + while (*part != 0) { + if (*part != *full) { + used_full = 0; + break; + } + + /* + * Adjust the return-value to allow the rare case of + * string<delay>string + * to remove the whole piece. The most common case is a delay at the + * end of the string. The adjusted string will retain the delay, which + * is conservative. + */ + if (used_delay != 0) { + used_full += used_delay; + used_delay = 0; + } + if (*part == '$' && *full == '$') { + next_part = skip_delay(part); + next_full = skip_delay(full); + if (next_part != part && next_full != full) { + used_delay += (unsigned) (next_full - full); + full = next_full; + part = next_part; + continue; + } + } + ++used_full; + ++part; + ++full; + } + return used_full; +} + +/* + * While 'sgr0' is the "same" as termcap 'me', there is a compatibility issue. + * The sgr/sgr0 capabilities include setting/clearing alternate character set + * mode. A termcap application cannot use sgr, so sgr0 strings that reset + * alternate character set mode will be misinterpreted. Here, we remove those + * from the more common ISO/ANSI/VT100 entries, which have sgr0 agreeing with + * sgr. + * + * This function returns the modified sgr0 if it can be modified, a null if + * an error occurs, or the original sgr0 if no change is needed. + */ +NCURSES_EXPORT(char *) +_nc_trim_sgr0(TERMTYPE *tp) +{ + char *result = exit_attribute_mode; + + T((T_CALLED("_nc_trim_sgr0()"))); + + if (PRESENT(exit_attribute_mode) + && PRESENT(set_attributes)) { + bool found = FALSE; + char *on = set_attribute_9(tp, 1); + char *off = set_attribute_9(tp, 0); + char *end = strdup(exit_attribute_mode); + char *tmp; + size_t i, j, k; + + TR(TRACE_DATABASE, ("checking if we can trim sgr0 based on sgr")); + TR(TRACE_DATABASE, ("sgr0 %s", _nc_visbuf(end))); + TR(TRACE_DATABASE, ("sgr(9:off) %s", _nc_visbuf(off))); + TR(TRACE_DATABASE, ("sgr(9:on) %s", _nc_visbuf(on))); + + if (!rewrite_sgr(on, enter_alt_charset_mode) + || !rewrite_sgr(off, exit_alt_charset_mode) + || !rewrite_sgr(end, exit_alt_charset_mode)) { + FreeIfNeeded(off); + } else if (similar_sgr(off, end) + && !similar_sgr(off, on)) { + TR(TRACE_DATABASE, ("adjusting sgr(9:off) : %s", _nc_visbuf(off))); + result = off; + /* + * If rmacs is a substring of sgr(0), remove that chunk. + */ + if (exit_alt_charset_mode != 0) { + TR(TRACE_DATABASE, ("scan for rmacs %s", _nc_visbuf(exit_alt_charset_mode))); + j = strlen(off); + k = strlen(exit_alt_charset_mode); + if (j > k) { + for (i = 0; i <= (j - k); ++i) { + unsigned k2 = compare_part(exit_alt_charset_mode, + off + i); + if (k2 != 0) { + found = TRUE; + chop_out(off, (unsigned) i, (unsigned) (i + k2)); + break; + } + } + } + } + /* + * SGR 10 would reset to normal font. + */ + if (!found) { + if ((i = (size_t) is_csi(off)) != 0 + && off[strlen(off) - 1] == 'm') { + TR(TRACE_DATABASE, ("looking for SGR 10 in %s", + _nc_visbuf(off))); + tmp = skip_zero(off + i); + if (tmp[0] == '1' + && skip_zero(tmp + 1) != tmp + 1) { + i = (size_t) (tmp - off); + if (off[i - 1] == ';') + i--; + j = (size_t) (skip_zero(tmp + 1) - off); + (void) chop_out(off, (unsigned) i, (unsigned) j); + found = TRUE; + } + } + } + if (!found + && (tmp = strstr(end, off)) != 0 + && strcmp(end, off) != 0) { + i = (size_t) (tmp - end); + j = strlen(off); + tmp = strdup(end); + chop_out(tmp, (unsigned) i, (unsigned) j); + free(off); + result = tmp; + } + TR(TRACE_DATABASE, ("...adjusted sgr0 : %s", _nc_visbuf(result))); + if (!strcmp(result, exit_attribute_mode)) { + TR(TRACE_DATABASE, ("...same result, discard")); + free(result); + result = exit_attribute_mode; + } + } else { + /* + * Either the sgr does not reference alternate character set, + * or it is incorrect. That's too hard to decide right now. + */ + free(off); + } + FreeIfNeeded(end); + FreeIfNeeded(on); + } else { + /* + * Possibly some applications are confused if sgr0 contains rmacs, + * but that would be a different bug report -TD + */ + } + + returnPtr(result); +} |