Support simple 8 bit ansi escape sequences
See https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit Support standard and high intensity colors. The default ncurses colors ARE the high intensity colors - represented via an 8 bit ansi escape sequence here.
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52
watch.c
52
watch.c
@ -138,36 +138,36 @@ static void init_ansi_colors(void)
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static int process_ansi_color_escape_sequence(char** escape_sequence) {
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// process SGR ANSI color escape sequence
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// Eg 8-bit
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// 38;5;⟨n⟩ (set fg color to n)
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// 48;5;⟨n⟩ (set bg color to n)
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//
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// Eg 24-bit (not yet implemented)
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// ESC[ 38;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB foreground color
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// ESC[ 48;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB background color
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int num;
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// process SGR ANSI color escape sequence
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// Eg 8-bit
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// 38;5;⟨n⟩ (set fg color to n)
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// 48;5;⟨n⟩ (set bg color to n)
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//
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// Eg 24-bit (not yet implemented)
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// ESC[ 38;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB foreground color
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// ESC[ 48;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB background color
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int num;
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if ((*escape_sequence)[0] != ';')
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return 0; /* not understood */
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if ((*escape_sequence)[0] != ';')
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return 0; /* not understood */
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if ((*escape_sequence)[1] == '5') {
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// 8 bit! ANSI specifies a predefined set of 256 colors here.
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if ((*escape_sequence)[2] != ';')
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return 0; /* not understood */
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num = strtol((*escape_sequence) + 3, escape_sequence, 10);
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if (num >= 0 && num <= 7) {
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// 0-7 are standard colors same as SGR 30-37
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return num + 1;
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}
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if ((*escape_sequence)[1] == '5') {
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// 8 bit! ANSI specifies a predefined set of 256 colors here.
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if ((*escape_sequence)[2] != ';')
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return 0; /* not understood */
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num = strtol((*escape_sequence) + 3, escape_sequence, 10);
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if (num >= 0 && num <= 7) {
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// 0-7 are standard colors same as SGR 30-37
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return num + 1;
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}
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// Remainder aren't yet implemented
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// 8- 15: high intensity colors (as in ESC [ 90–97 m)
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// 16-231: 6 × 6 × 6 cube (216 colors): 16 + 36 × r + 6 × g + b (0 ≤ r, g, b ≤ 5)
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// 232-255: grayscale from black to white in 24 steps
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}
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// Remainder aren't yet implemented
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// 8- 15: high intensity colors (as in ESC [ 90–97 m)
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// 16-231: 6 × 6 × 6 cube (216 colors): 16 + 36 × r + 6 × g + b (0 ≤ r, g, b ≤ 5)
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// 232-255: grayscale from black to white in 24 steps
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}
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return 0; /* not understood */
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return 0; /* not understood */
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}
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