From 1bd537c350303b0de41f666bc795561dc04beb6c Mon Sep 17 00:00:00 2001 From: Jim Chen Date: Wed, 16 May 2018 00:23:15 -0400 Subject: [PATCH] GUACAMOLE-470: Support configurable colors in color-scheme parameter. Add support for configuring individual colors in the color-scheme parameter, by parsing the parameter content into name-value pairs. Backward compatibility is preserved by translating previously supported values into corresponding new values. --- src/protocols/ssh/settings.c | 10 +- src/protocols/telnet/settings.c | 10 +- src/terminal/terminal.c | 309 +++++++++++++++++++++++++++---- src/terminal/terminal/terminal.h | 15 ++ 4 files changed, 297 insertions(+), 47 deletions(-) diff --git a/src/protocols/ssh/settings.c b/src/protocols/ssh/settings.c index 983f7f08..923c9e18 100644 --- a/src/protocols/ssh/settings.c +++ b/src/protocols/ssh/settings.c @@ -121,10 +121,12 @@ enum SSH_ARGS_IDX { #endif /** - * The name of the color scheme to use. Currently valid color schemes are: - * "black-white", "white-black", "gray-black", and "green-black", each - * following the "foreground-background" pattern. By default, this will be - * "gray-black". + * The color scheme to use, as a series of semicolon-separated color-value + * pairs: "background: ", "foreground: ", or + * "color: ", where is a number from 0 to 255, and is + * "color" or an X11 color code (e.g. "aqua" or "rgb:12/34/56"). + * The color scheme can also be one of the special values: "black-white", + * "white-black", "gray-black", or "green-black". */ IDX_COLOR_SCHEME, diff --git a/src/protocols/telnet/settings.c b/src/protocols/telnet/settings.c index 8f802915..45d62907 100644 --- a/src/protocols/telnet/settings.c +++ b/src/protocols/telnet/settings.c @@ -99,10 +99,12 @@ enum TELNET_ARGS_IDX { IDX_FONT_SIZE, /** - * The name of the color scheme to use. Currently valid color schemes are: - * "black-white", "white-black", "gray-black", and "green-black", each - * following the "foreground-background" pattern. By default, this will be - * "gray-black". + * The color scheme to use, as a series of semicolon-separated color-value + * pairs: "background: ", "foreground: ", or + * "color: ", where is a number from 0 to 255, and is + * "color" or an X11 color code (e.g. "aqua" or "rgb:12/34/56"). + * The color scheme can also be one of the special values: "black-white", + * "white-black", "gray-black", or "green-black". */ IDX_COLOR_SCHEME, diff --git a/src/terminal/terminal.c b/src/terminal/terminal.c index a9f5ae51..50d24be4 100644 --- a/src/terminal/terminal.c +++ b/src/terminal/terminal.c @@ -29,7 +29,9 @@ #include "terminal/terminal_handlers.h" #include "terminal/types.h" #include "terminal/typescript.h" +#include "terminal/xparsecolor.h" +#include #include #include #include @@ -255,53 +257,255 @@ void* guac_terminal_thread(void* data) { } +/** + * Compare a non-null-terminated string to a null-terminated literal, in the + * same manner as strcmp(). + * + * @param str_start + * Start of the non-null-terminated string. + * + * @param str_end + * End of the non-null-terminated string, after the last character. + * + * @param literal + * The null-terminated literal to compare against. + * + * @return + * Zero if the two strings are equal and non-zero otherwise. + */ +static int guac_terminal_color_scheme_compare_token(const char* str_start, + const char* str_end, const char* literal) { + + const int result = strncmp(literal, str_start, str_end - str_start); + if (result != 0) + return result; + + /* At this point, literal is same length or longer than + * | str_end - str_start |, so if the two are equal, literal should + * have its null-terminator at | str_end - str_start |. */ + return (int) (unsigned char) literal[str_end - str_start]; +} + +/** + * Strip the leading and trailing spaces of a bounded string. + * + * @param[in,out] str_start + * Address of a pointer to the start of the string. On return, the pointer + * is advanced to after any leading spaces. + * + * @param[in,out] str_end + * Address of a pointer to the end of the string, after the last character. + * On return, the pointer is moved back to before any trailing spaces. + */ +static void guac_terminal_color_scheme_strip_spaces(const char** str_start, + const char** str_end) { + + /* Strip leading spaces. */ + while (*str_start < *str_end && isspace(**str_start)) + (*str_start)++; + + /* Strip trailing spaces. */ + while (*str_end > *str_start && isspace(*(*str_end - 1))) + (*str_end)--; +} + +/** + * Parse the name part of the name-value pair within the color-scheme + * configuration. + * + * @param client + * The client that the terminal is connected to. + * + * @param name_start + * Start of the name string. + * + * @param name_end + * End of the name string, after the last character. + * + * @param foreground + * Pointer to the foreground color. + * + * @param background + * Pointer to the background color. + * + * @param palette + * Pointer to the palette array. + * + * @param[out] target + * On return, pointer to the color struct that corresponds to the name. + * + * @return + * Zero if successful or non-zero otherwise. + */ +static int guac_terminal_parse_color_scheme_name(guac_client* client, + const char* name_start, const char* name_end, + guac_terminal_color* foreground, guac_terminal_color* background, + guac_terminal_color (*palette)[256], + guac_terminal_color** target) { + + guac_terminal_color_scheme_strip_spaces(&name_start, &name_end); + + if (!guac_terminal_color_scheme_compare_token( + name_start, name_end, GUAC_TERMINAL_SCHEME_FOREGROUND)) { + *target = foreground; + return 0; + } + + if (!guac_terminal_color_scheme_compare_token( + name_start, name_end, GUAC_TERMINAL_SCHEME_BACKGROUND)) { + *target = background; + return 0; + } + + /* Parse color value. */ + int index = -1; + if (sscanf(name_start, GUAC_TERMINAL_SCHEME_NUMBERED "%d", &index) && + index >= 0 && index <= 255) { + *target = &(*palette)[index]; + return 0; + } + + guac_client_log(client, GUAC_LOG_WARNING, + "Unknown color name: \"%.*s\".", + name_end - name_start, name_start); + return 1; +} + +/** + * Parse the value part of the name-value pair within the color-scheme + * configuration. + * + * @param client + * The client that the terminal is connected to. + * + * @param value_start + * Start of the value string. + * + * @param value_end + * End of the value string, after the last character. + * + * @param palette + * The current color palette. + * + * @param[out] target + * On return, the parsed color. + * + * @return + * Zero if successful or non-zero otherwise. + */ +static int guac_terminal_parse_color_scheme_value(guac_client* client, + const char* value_start, const char* value_end, + const guac_terminal_color (*palette)[256], + guac_terminal_color* target) { + + guac_terminal_color_scheme_strip_spaces(&value_start, &value_end); + + /* Parse color value. */ + int index = -1; + if (sscanf(value_start, GUAC_TERMINAL_SCHEME_NUMBERED "%d", &index) && + index >= 0 && index <= 255) { + *target = (*palette)[index]; + return 0; + } + + /* Parse X11 value. */ + if (!guac_terminal_xparsecolor(value_start, target)) + return 0; + + guac_client_log(client, GUAC_LOG_WARNING, + "Invalid color value: \"%.*s\".", + value_end - value_start, value_start); + return 1; +} + +/** + * Parse a color-scheme configuration string, and return specified + * foreground/background colors and color palette. + * + * @param client + * The client that the terminal is connected to. + * + * @param color_scheme + * A semicolon-separated list of name-value pairs, i.e. + * ": [; : [; ...]]". + * For example, "color2: rgb:cc/33/22; background: color5". + * + * @param[out] foreground + * Parsed foreground color. + * + * @param[out] background + * Parsed background color. + * + * @param[in,out] palette + * Parsed color palette. The caller is responsible for allocating a mutable + * array on entry. On return, the array contains the parsed palette. + */ +static void guac_terminal_parse_color_scheme(guac_client* client, + const char* color_scheme, guac_terminal_color* foreground, + guac_terminal_color* background, + guac_terminal_color (*palette)[256]) { + + /* Set default gray-black color scheme and initial palette. */ + *foreground = GUAC_TERMINAL_INITIAL_PALETTE[GUAC_TERMINAL_COLOR_GRAY]; + *background = GUAC_TERMINAL_INITIAL_PALETTE[GUAC_TERMINAL_COLOR_BLACK]; + memcpy(palette, GUAC_TERMINAL_INITIAL_PALETTE, + sizeof(GUAC_TERMINAL_INITIAL_PALETTE)); + + /* Current char being parsed, or NULL if at end of parsing. */ + const char* cursor = color_scheme; + + while (cursor) { + /* Start of the current "name: value" pair. */ + const char* pair_start = cursor; + + /* End of the current name-value pair. */ + const char* pair_end = strchr(pair_start, ';'); + if (pair_end) { + cursor = pair_end + 1; + } + else { + pair_end = pair_start + strlen(pair_start); + cursor = NULL; + } + + guac_terminal_color_scheme_strip_spaces(&pair_start, &pair_end); + if (pair_start >= pair_end) + /* Allow empty pairs, which happens, e.g., when the configuration + * string ends in a semi-colon. */ + continue; + + /* End of the name part of the pair. */ + const char* name_end = memchr(pair_start, ':', pair_end - pair_start); + if (name_end == NULL) { + guac_client_log(client, GUAC_LOG_WARNING, + "Expecting colon: \"%.*s\".", + pair_end - pair_start, pair_start); + return; + } + + /* The color that the name corresponds to. */ + guac_terminal_color* color_target = NULL; + + if (guac_terminal_parse_color_scheme_name( + client, pair_start, name_end, foreground, background, + palette, &color_target)) + return; /* Parsing failed. */ + + if (guac_terminal_parse_color_scheme_value( + client, name_end + 1, pair_end, palette, color_target)) + return; /* Parsing failed. */ + } +} + guac_terminal* guac_terminal_create(guac_client* client, const char* font_name, int font_size, int dpi, int width, int height, const char* color_scheme, const int backspace) { - int default_foreground; - int default_background; - - /* Default to "gray-black" color scheme if no scheme provided */ - if (color_scheme == NULL || color_scheme[0] == '\0') { - default_foreground = GUAC_TERMINAL_COLOR_GRAY; - default_background = GUAC_TERMINAL_COLOR_BLACK; - } - - /* Otherwise, parse color scheme */ - else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_GRAY_BLACK) == 0) { - default_foreground = GUAC_TERMINAL_COLOR_GRAY; - default_background = GUAC_TERMINAL_COLOR_BLACK; - } - else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_BLACK_WHITE) == 0) { - default_foreground = GUAC_TERMINAL_COLOR_BLACK; - default_background = GUAC_TERMINAL_COLOR_WHITE; - } - else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_GREEN_BLACK) == 0) { - default_foreground = GUAC_TERMINAL_COLOR_DARK_GREEN; - default_background = GUAC_TERMINAL_COLOR_BLACK; - } - else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_WHITE_BLACK) == 0) { - default_foreground = GUAC_TERMINAL_COLOR_WHITE; - default_background = GUAC_TERMINAL_COLOR_BLACK; - } - - /* If invalid, default to "gray-black" */ - else { - guac_client_log(client, GUAC_LOG_WARNING, - "Invalid color scheme: \"%s\". Defaulting to \"gray-black\".", - color_scheme); - default_foreground = GUAC_TERMINAL_COLOR_GRAY; - default_background = GUAC_TERMINAL_COLOR_BLACK; - } - /* Build default character using default colors */ guac_terminal_char default_char = { .value = 0, .attributes = { - .foreground = GUAC_TERMINAL_INITIAL_PALETTE[default_foreground], - .background = GUAC_TERMINAL_INITIAL_PALETTE[default_background], .bold = false, .half_bright = false, .reverse = false, @@ -310,6 +514,32 @@ guac_terminal* guac_terminal_create(guac_client* client, .width = 1 }; + /* Initialized by guac_terminal_parse_color_scheme. */ + guac_terminal_color (*default_palette)[256] = (guac_terminal_color(*)[256]) + malloc(sizeof(guac_terminal_color[256])); + + /* Special cases. */ + if (color_scheme == NULL || color_scheme[0] == '\0') { + /* guac_terminal_parse_color_scheme defaults to gray-black */ + } + else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_GRAY_BLACK) == 0) { + color_scheme = "foreground:color7;background:color0"; + } + else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_BLACK_WHITE) == 0) { + color_scheme = "foreground:color0;background:color15"; + } + else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_GREEN_BLACK) == 0) { + color_scheme = "foreground:color2;background:color0"; + } + else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_WHITE_BLACK) == 0) { + color_scheme = "foreground:color15;background:color0"; + } + + guac_terminal_parse_color_scheme(client, color_scheme, + &default_char.attributes.foreground, + &default_char.attributes.background, + default_palette); + /* Calculate available display area */ int available_width = width - GUAC_TERMINAL_SCROLLBAR_WIDTH; if (available_width < 0) @@ -332,7 +562,8 @@ guac_terminal* guac_terminal_create(guac_client* client, term->display = guac_terminal_display_alloc(client, font_name, font_size, dpi, &default_char.attributes.foreground, - &default_char.attributes.background, NULL); + &default_char.attributes.background, + default_palette); /* Fail if display init failed */ if (term->display == NULL) { diff --git a/src/terminal/terminal/terminal.h b/src/terminal/terminal/terminal.h index c071b402..6094c393 100644 --- a/src/terminal/terminal/terminal.h +++ b/src/terminal/terminal/terminal.h @@ -83,6 +83,21 @@ */ #define GUAC_TERMINAL_SCHEME_WHITE_BLACK "white-black" +/** + * Color name representing the foreground color. + */ +#define GUAC_TERMINAL_SCHEME_FOREGROUND "foreground" + +/** + * Color name representing the background color. + */ +#define GUAC_TERMINAL_SCHEME_BACKGROUND "background" + +/** + * Color name representing a numbered color. + */ +#define GUAC_TERMINAL_SCHEME_NUMBERED "color" + typedef struct guac_terminal guac_terminal; /**