FreeCalypso > hg > freecalypso-tools

annotate loadtools/tpinterf2.c @ 823:9092ff68e37d

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buzplayer: implement PWT mode melody entry
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 30 May 2021 04:42:05 +0000
parents 8d7dcfd9df53
children
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1 /*
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2 * This module provides a more advanced target interface function
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3 * than tpinterf.c - programmatic capture of target responses.
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4 * It is linked by some of our programs, but not all.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/time.h>
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9 #include <sys/errno.h>
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10 #include <stdio.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include <stdlib.h>
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14 #include <unistd.h>
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15
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16 extern int errno;
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17
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18 extern int target_fd;
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19
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20 /*
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21 * This functions reads the serial output from the target until a
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22 * '=' prompt is received. All intermediate output is parsed into
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23 * lines and passed to a callback function.
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24 *
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25 * The callback function is called with a pointer to each received
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26 * line, stored in a buffer ending in NUL, with CRLF stripped.
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27 * The callback function is expected to return an int. If the
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28 * callback return value is negative, this function returns immediately
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29 * with that negative value. If the callback return value is positive
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30 * or zero, it is added to an accumulator.
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31 *
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32 * Termination: this function returns when it has received a '=' at
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33 * the beginning of a line (return value is the callback return
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34 * accumulator, or 0 if no lines came), if the callback returns a
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35 * negative value (that value is returned), or if an error is detected
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36 * within this function (return value -1, and an error message
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37 * printed on stderr).
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38 */
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39 tpinterf_capture_output(timeout, callback)
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40 int timeout; /* seconds */
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41 int (*callback)();
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42 {
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43 char buf[512], *cp;
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44 char line[1024], *dp = line;
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45 fd_set fds;
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46 struct timeval tv;
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47 int cc, linelen = 0;
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48 int totout = 0, cbret;
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49
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50 for (;;) {
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51 FD_ZERO(&fds);
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52 FD_SET(target_fd, &fds);
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53 tv.tv_sec = timeout;
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54 tv.tv_usec = 0;
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55 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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56 if (cc < 0) {
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57 if (errno == EINTR)
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58 continue;
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59 perror("select");
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60 return(-1);
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61 }
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62 if (cc < 1) {
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63 fprintf(stderr,
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64 "error: timeout waiting for \'=\' prompt from target\n");
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65 return(-1);
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66 }
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67 cc = read(target_fd, buf, sizeof buf);
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68 if (cc <= 0) {
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69 perror("read after successful select");
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70 return(-1);
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71 }
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72 for (cp = buf; cc; cp++) {
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73 cc--;
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74 if (*cp == '=' && !linelen && !cc)
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75 return(totout);
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76 if (*cp == '\r')
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77 continue;
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78 if (*cp == '\n') {
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79 *dp = '\0';
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80 cbret = callback(line);
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81 if (cbret < 0)
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82 return(cbret);
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83 totout += cbret;
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84 dp = line;
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85 linelen = 0;
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86 continue;
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87 }
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88 *dp++ = *cp;
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89 linelen++;
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90 if (linelen >= sizeof line) {
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91 fprintf(stderr,
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92 "error: target response line length exceeds buffer\n");
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93 return(-1);
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94 }
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95 }
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96 }
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97 }
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98
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99 /* single line response capture mechanism */
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100 /* same line buffer size as in tpinterf_capture_output() */
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101 char target_response_line[1024];
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102
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103 static
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104 oneline_catcher(linein)
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105 char *linein;
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106 {
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107 strcpy(target_response_line, linein);
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108 return(1);
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109 }
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110
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111 tpinterf_capture_output_oneline(timeout)
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112 {
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113 return tpinterf_capture_output(timeout, oneline_catcher);
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114 }