FreeCalypso > hg > freecalypso-citrine

annotate lldbg/cmdentry.c @ 49:908742e46a7f default tip

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README: FC Selenite updates
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 14 Apr 2020 21:55:22 +0000
parents 75a11d740a02
children
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Mychaela Falconia <falcon@freecalypso.org>
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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 }