FreeCalypso > hg > freecalypso-tools

annotate target-utils/libcommon/cmdentry.c @ 619:f82551c77e58

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libserial-newlnx: ASYNC_LOW_LATENCY patch reverted Reports from Das Signal indicate that loadtools performance on Debian is about the same as on Slackware, and that including or omitting the ASYNC_LOW_LATENCY patch from Serg makes no difference. Because the patch in question does not appear to be necessary, it is being reverted until and unless someone other than Serg reports an actual real-world system on which loadtools operation times are slowed compared to the Mother's Slackware reference and on which Slackware-like performance can be restored by setting the ASYNC_LOW_LATENCY flag.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 27 Feb 2020 01:09:48 +0000
parents e7502631a0f9
children
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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 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 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 = mygetchar();
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34 if (ch >= ' ' && ch <= '~') {
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35 if (inlen < MAXCMD) {
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36 command[inlen++] = ch;
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37 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 command[inlen] = '\0';
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46 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 putchar('\b');
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52 putchar(' ');
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53 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 putchar('^');
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60 putchar('C');
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61 putchar('\n');
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62 return(0);
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63 case 0x15: /* ^U */
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64 putchar('^');
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65 putchar('U');
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66 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 }