Currently if an escape timer is interrupted by a character from a different input source then the new character is discarded and the function returns '\e' (which will be discarded by the level above). It is hard to see why this would ever be the desired behaviour. Fix this to return the new character rather than the '\e'. This is a bigger refactor than might be expected because the new character needs to go through escape sequence detection.
Showing the changes to kernel/debug (1 of 1 file). Show all
Unified · Split
| @@ -127,10 +127,10 @@ char kdb_getchar(void) · 126 unmodified lines | |||
| 127 | { | 127 | { |
| 128 | #define ESCAPE_UDELAY 1000 | 128 | #define ESCAPE_UDELAY 1000 |
| 129 | #define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */ | 129 | #define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */ |
| 130 | char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */ | 130 | char buf[4]; /* longest vt100 escape sequence is 4 bytes */ |
| 131 | char *ped = escape_data; | 131 | char *pbuf = buf; |
| 132 | int escape_delay = 0; | 132 | int escape_delay = 0; |
| 133 | get_char_func *f, *f_escape = NULL; | 133 | get_char_func *f, *f_prev = NULL; |
| 134 | int key; | 134 | int key; |
| 135 | 135 | ||
| 136 | for (f = &kdb_poll_funcs[0]; ; ++f) { | 136 | for (f = &kdb_poll_funcs[0]; ; ++f) { |
| @@ -150,26 +150,26 @@ char kdb_getchar(void) · 13 unmodified lines | |||
| 150 | continue; | 150 | continue; |
| 151 | } | 151 | } |
| 152 | 152 | ||
| 153 | if (escape_delay == 0 && key == '\e') { | 153 | /* |
| 154 | * When the first character is received (or we get a change | ||
| 155 | * input source) we set ourselves up to handle an escape | ||
| 156 | * sequences (just in case). | ||
| 157 | */ | ||
| 158 | if (f_prev != f) { | ||
| 159 | f_prev = f; | ||
| 160 | pbuf = buf; | ||
| 154 | escape_delay = ESCAPE_DELAY; | 161 | escape_delay = ESCAPE_DELAY; |
| 155 | ped = escape_data; | ||
| 156 | f_escape = f; | ||
| 157 | } | ||
| 158 | if (escape_delay) { | ||
| 159 | if (f_escape != f) | ||
| 160 | return '\e'; | ||
| 161 | |||
| 162 | *ped++ = key; | ||
| 163 | key = kdb_handle_escape(escape_data, ped - escape_data); | ||
| 164 | if (key < 0) | ||
| 165 | return '\e'; | ||
| 166 | if (key == 0) | ||
| 167 | continue; | ||
| 168 | } | 162 | } |
| 169 | 163 | ||
| 170 | break; /* A key to process */ | 164 | *pbuf++ = key; |
| 165 | key = kdb_handle_escape(buf, pbuf - buf); | ||
| 166 | if (key < 0) /* no escape sequence; return first character */ | ||
| 167 | return buf[0]; | ||
| 168 | if (key > 0) | ||
| 169 | return key; | ||
| 171 | } | 170 | } |
| 172 | return key; | 171 | |
| 172 | unreachable(); | ||
| 173 | } | 173 | } |
| 174 | 174 | ||
| 175 | /* | 175 | /* |