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Diffstat (limited to 'payloads/libpayload/curses/PDCurses-3.4/pdcurses/color.c')
| -rw-r--r-- | payloads/libpayload/curses/PDCurses-3.4/pdcurses/color.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/payloads/libpayload/curses/PDCurses-3.4/pdcurses/color.c b/payloads/libpayload/curses/PDCurses-3.4/pdcurses/color.c new file mode 100644 index 0000000000..038f760457 --- /dev/null +++ b/payloads/libpayload/curses/PDCurses-3.4/pdcurses/color.c @@ -0,0 +1,295 @@ +/* Public Domain Curses */ + +#include <curspriv.h> + +RCSID("$Id: color.c,v 1.83 2008/07/13 16:08:18 wmcbrine Exp $") + +/*man-start************************************************************** + + Name: color + + Synopsis: + int start_color(void); + int init_pair(short pair, short fg, short bg); + int init_color(short color, short red, short green, short blue); + bool has_colors(void); + bool can_change_color(void); + int color_content(short color, short *red, short *green, short *blue); + int pair_content(short pair, short *fg, short *bg); + + int assume_default_colors(int f, int b); + int use_default_colors(void); + + int PDC_set_line_color(short color); + + Description: + To use these routines, start_color() must be called, usually + immediately after initscr(). Colors are always used in pairs, + referred to as color-pairs. A color-pair consists of a + foreground color and a background color. A color-pair is + initialized via init_pair(). After initialization, COLOR_PAIR(n) + can be used like any other video attribute. + + start_color() initializes eight basic colors (black, red, green, + yellow, blue, magenta, cyan, and white), and two global + variables; COLORS and COLOR_PAIRS (respectively defining the + maximum number of colors and color-pairs the terminal is capable + of displaying). + + init_pair() changes the definition of a color-pair. It takes + three arguments: the number of the color-pair to be redefined, + and the new values of the foreground and background colors. The + pair number must be between 0 and COLOR_PAIRS - 1, inclusive. + The foreground and background must be between 0 and COLORS - 1, + inclusive. If the color pair was previously initialized, the + screen is refreshed, and all occurrences of that color-pair are + changed to the new definition. + + has_colors() indicates if the terminal supports, and can + maniplulate color. It returns TRUE or FALSE. + + can_change_color() indicates if the terminal has the capability + to change the definition of its colors. + + pair_content() is used to determine what the colors of a given + color-pair consist of. + + assume_default_colors() and use_default_colors() emulate the + ncurses extensions of the same names. assume_default_colors(f, + b) is essentially the same as init_pair(0, f, b) (which isn't + allowed); it redefines the default colors. use_default_colors() + allows the use of -1 as a foreground or background color with + init_pair(), and calls assume_default_colors(-1, -1); -1 + represents the foreground or background color that the terminal + had at startup. If the environment variable PDC_ORIGINAL_COLORS + is set at the time start_color() is called, that's equivalent to + calling use_default_colors(). + + PDC_set_line_color() is used to set the color, globally, for + the color of the lines drawn for the attributes: A_UNDERLINE, + A_OVERLINE, A_LEFTLINE and A_RIGHTLINE. A value of -1 (the + default) indicates that the current foreground color should be + used. + + NOTE: COLOR_PAIR() and PAIR_NUMBER() are implemented as macros. + + Return Value: + All functions return OK on success and ERR on error, except for + has_colors() and can_change_colors(), which return TRUE or FALSE. + + Portability X/Open BSD SYS V + start_color Y - 3.2 + init_pair Y - 3.2 + init_color Y - 3.2 + has_colors Y - 3.2 + can_change_color Y - 3.2 + color_content Y - 3.2 + pair_content Y - 3.2 + assume_default_colors - - - + use_default_colors - - - + PDC_set_line_color - - - + +**man-end****************************************************************/ + +#include <stdlib.h> +#include <string.h> + +int COLORS = 0; +int COLOR_PAIRS = PDC_COLOR_PAIRS; + +bool pdc_color_started = FALSE; + +/* pair_set[] tracks whether a pair has been set via init_pair() */ + +static bool pair_set[PDC_COLOR_PAIRS]; +static bool default_colors = FALSE; +static short first_col = 0; + +int start_color(void) +{ + PDC_LOG(("start_color() - called\n")); + + if (SP->mono) + return ERR; + + pdc_color_started = TRUE; + + PDC_set_blink(FALSE); /* Also sets COLORS, to 8 or 16 */ + + if (!default_colors && SP->orig_attr && getenv("PDC_ORIGINAL_COLORS")) + default_colors = TRUE; + + PDC_init_atrtab(); + + memset(pair_set, 0, PDC_COLOR_PAIRS); + + return OK; +} + +static void _normalize(short *fg, short *bg) +{ + if (*fg == -1) + *fg = SP->orig_attr ? SP->orig_fore : COLOR_WHITE; + + if (*bg == -1) + *bg = SP->orig_attr ? SP->orig_back : COLOR_BLACK; +} + +int init_pair(short pair, short fg, short bg) +{ + PDC_LOG(("init_pair() - called: pair %d fg %d bg %d\n", pair, fg, bg)); + + if (!pdc_color_started || pair < 1 || pair >= COLOR_PAIRS || + fg < first_col || fg >= COLORS || bg < first_col || bg >= COLORS) + return ERR; + + _normalize(&fg, &bg); + + /* To allow the PDC_PRESERVE_SCREEN option to work, we only reset + curscr if this call to init_pair() alters a color pair created by + the user. */ + + if (pair_set[pair]) + { + short oldfg, oldbg; + + PDC_pair_content(pair, &oldfg, &oldbg); + + if (oldfg != fg || oldbg != bg) + curscr->_clear = TRUE; + } + + PDC_init_pair(pair, fg, bg); + + pair_set[pair] = TRUE; + + return OK; +} + +bool has_colors(void) +{ + PDC_LOG(("has_colors() - called\n")); + + return !(SP->mono); +} + +int init_color(short color, short red, short green, short blue) +{ + PDC_LOG(("init_color() - called\n")); + + if (color < 0 || color >= COLORS || !PDC_can_change_color() || + red < 0 || red > 1000 || green < 0 || green > 1000 || + blue < 0 || blue > 1000) + return ERR; + + return PDC_init_color(color, red, green, blue); +} + +int color_content(short color, short *red, short *green, short *blue) +{ + PDC_LOG(("color_content() - called\n")); + + if (color < 0 || color >= COLORS || !red || !green || !blue) + return ERR; + + if (PDC_can_change_color()) + return PDC_color_content(color, red, green, blue); + else + { + /* Simulated values for platforms that don't support palette + changing */ + + short maxval = (color & 8) ? 1000 : 680; + + *red = (color & COLOR_RED) ? maxval : 0; + *green = (color & COLOR_GREEN) ? maxval : 0; + *blue = (color & COLOR_BLUE) ? maxval : 0; + + return OK; + } +} + +bool can_change_color(void) +{ + PDC_LOG(("can_change_color() - called\n")); + + return PDC_can_change_color(); +} + +int pair_content(short pair, short *fg, short *bg) +{ + PDC_LOG(("pair_content() - called\n")); + + if (pair < 0 || pair >= COLOR_PAIRS || !fg || !bg) + return ERR; + + return PDC_pair_content(pair, fg, bg); +} + +int assume_default_colors(int f, int b) +{ + PDC_LOG(("assume_default_colors() - called: f %d b %d\n", f, b)); + + if (f < -1 || f >= COLORS || b < -1 || b >= COLORS) + return ERR; + + if (pdc_color_started) + { + short fg, bg, oldfg, oldbg; + + fg = f; + bg = b; + + _normalize(&fg, &bg); + + PDC_pair_content(0, &oldfg, &oldbg); + + if (oldfg != fg || oldbg != bg) + curscr->_clear = TRUE; + + PDC_init_pair(0, fg, bg); + } + + return OK; +} + +int use_default_colors(void) +{ + PDC_LOG(("use_default_colors() - called\n")); + + default_colors = TRUE; + first_col = -1; + + return assume_default_colors(-1, -1); +} + +int PDC_set_line_color(short color) +{ + PDC_LOG(("PDC_set_line_color() - called: %d\n", color)); + + if (color < -1 || color >= COLORS) + return ERR; + + SP->line_color = color; + + return OK; +} + +void PDC_init_atrtab(void) +{ + int i; + short fg, bg; + + if (pdc_color_started && !default_colors) + { + fg = COLOR_WHITE; + bg = COLOR_BLACK; + } + else + fg = bg = -1; + + _normalize(&fg, &bg); + + for (i = 0; i < PDC_COLOR_PAIRS; i++) + PDC_init_pair(i, fg, bg); +} |