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Add comments and limit to standard colors

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This commit is contained in:
Nipunn Koorapati 2020-07-13 00:59:29 +00:00 committed by Craig Small
parent 8d0928f072
commit a3a5db1311
1 changed files with 18 additions and 7 deletions
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25
watch.c
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@ -137,23 +137,34 @@ static void init_ansi_colors(void)
}
static int color_escape_sequence(char** escape_sequence) {
static int process_ansi_color_escape_sequence(char** escape_sequence) {
// process SGR ANSI color escape sequence
// Eg 8-bit
// 38;5;⟨n⟩ (set fg color to n)
// 48;5;⟨n⟩ (set bg color to n)
//
// Eg 24-bit (not yet implemented)
// ESC[ 38;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB foreground color
// ESC[ 48;2;⟨r⟩;⟨g⟩;⟨b⟩ m Select RGB background color
int num;
if ((*escape_sequence)[0] != ';')
return 0; /* not understood */
if ((*escape_sequence)[1] == '5') {
// 8 bit!
// 8 bit! ANSI specifies a predefined set of 256 colors here.
if ((*escape_sequence)[2] != ';')
return 0; /* not understood */
num = strtol((*escape_sequence) + 3, escape_sequence, 10);
if (num >= 0 && num <= 7) {
// 0-7 are standard colors same as SGR 30-37
return num + 1;
} else if (num >= 8 && num <= 15) {
// Bright intensity colors. Show them as normal for simplicty of impl
return num - 8 + 1;
}
// Remainder aren't yet implemented
// 8- 15: high intensity colors (as in ESC [ 90–97 m)
// 16-231: 6 × 6 × 6 cube (216 colors): 16 + 36 × r + 6 × g + b (0 ≤ r, g, b ≤ 5)
// 232-255: grayscale from black to white in 24 steps
}
return 0; /* not understood */
@ -209,7 +220,7 @@ static int set_ansi_attribute(const int attrib, char** escape_sequence)
attributes &= ~A_REVERSE;
break;
case 38:
fg_col = color_escape_sequence(escape_sequence);
fg_col = process_ansi_color_escape_sequence(escape_sequence);
if (fg_col == 0) {
return 0; /* not understood */
}
@ -218,7 +229,7 @@ static int set_ansi_attribute(const int attrib, char** escape_sequence)
fg_col = 0;
break;
case 48:
bg_col = color_escape_sequence(escape_sequence);
bg_col = process_ansi_color_escape_sequence(escape_sequence);
if (bg_col == 0) {
return 0; /* not understood */
}