FreeCalypso > hg > freecalypso-citrine
annotate lldbg/cmdentry.c @ 49:908742e46a7f default tip
README: FC Selenite updates
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 14 Apr 2020 21:55:22 +0000 |
parents | 75a11d740a02 |
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1 /* |
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2 * This module implements ASCII command entry via the serial port, |
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3 * with normal echo and minimal editing (rubout and kill). |
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4 * |
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5 * The command string buffer is bss-allocated here as well. It is |
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6 * sized to allow a maximum-size S-record to be sent as a command, |
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7 * as that is how we expect flash loading and XRAM chain-loading |
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8 * to be done. |
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9 */ |
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10 |
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11 #define MAXCMD 527 |
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12 |
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13 char lldbg_command[MAXCMD+1]; |
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14 |
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15 /* |
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16 * The command_entry() function takes no arguments, and begins by waiting |
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17 * for serial input - hence the prompt should be printed before calling it. |
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18 * |
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19 * This function returns when one of the following characters is received: |
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20 * CR - accepts the command |
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21 * ^C or ^U - cancels the command |
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22 * |
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23 * The return value is non-zero if a non-empty command was accepted with CR, |
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24 * or 0 if the user hit CR with no input or if the command was canceled |
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25 * with ^C or ^U. In any case a CRLF is sent out the serial port |
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26 * to close the input echo line before this function returns. |
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27 */ |
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28 lldbg_command_entry() |
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29 { |
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30 int inlen, ch; |
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31 |
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32 for (inlen = 0; ; ) { |
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33 ch = lldbg_getchar(); |
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34 if (ch >= ' ' && ch <= '~') { |
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35 if (inlen < MAXCMD) { |
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36 lldbg_command[inlen++] = ch; |
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37 lldbg_putchar(ch); |
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38 } else |
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39 /* putchar(7) */; |
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40 continue; |
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41 } |
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42 switch (ch) { |
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43 case '\r': |
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44 case '\n': |
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45 lldbg_command[inlen] = '\0'; |
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46 lldbg_putchar('\n'); |
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47 return(inlen); |
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48 case '\b': /* BS */ |
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49 case 0x7F: /* DEL */ |
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50 if (inlen) { |
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51 lldbg_putchar('\b'); |
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52 lldbg_putchar(' '); |
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53 lldbg_putchar('\b'); |
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54 inlen--; |
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55 } else |
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56 /* putchar(7) */; |
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57 continue; |
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58 case 0x03: /* ^C */ |
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59 lldbg_putchar('^'); |
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60 lldbg_putchar('C'); |
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61 lldbg_putchar('\n'); |
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62 return(0); |
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63 case 0x15: /* ^U */ |
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64 lldbg_putchar('^'); |
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65 lldbg_putchar('U'); |
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66 lldbg_putchar('\n'); |
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67 return(0); |
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68 default: |
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69 /* putchar(7) */; |
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70 } |
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71 } |
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72 } |