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annotate loadtools/tpinterf.c @ 21:67a39d8914a8

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starting work on loadtool
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sat, 04 May 2013 03:47:40 +0000
parents
children aca1948e9713
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21
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
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2 * Target program interface - this module provides some primitives
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3 * for communicating programmatically with loadagent and possibly
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4 * other target-utils.
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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 <string.h>
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11 #include <strings.h>
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12 #include <stdlib.h>
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13
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14 extern int errno;
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15
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16 extern int target_fd;
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17
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18 /* definition matches ../target-utils/libcommon/cmdentry.c */
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19 #define MAXCMD 527
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20
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21 /*
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22 * static buffer between tpinterf_make_cmd and tpinterf_send_cmd
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23 *
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24 * We store the command with an ending \r\n so we can use it for
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25 * matching the received echo as well, hence the sizing of the
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26 * buffer.
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27 */
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28 static char cmdbuf[MAXCMD+2];
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29 static int cmdlen;
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30
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31 static int
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32 arg_chars_valid(arg)
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33 char *arg;
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34 {
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35 char *cp;
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36
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37 for (cp = arg; *cp; cp++)
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38 if (*cp < ' ' || *cp > '~')
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39 return(0);
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40 return(1);
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41 }
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42
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43 /*
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44 * This function takes a command for the target in argv form and
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45 * converts it to a space-separated continuous string which can be
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46 * passed as tty "keyboard" input to the target, enforcing length
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47 * and character validity limits in the process. The output is
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48 * stored in an internal static buffer for subsequent
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49 * tpinterf_send_cmd().
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50 *
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51 * Return value: 0 if everything OK, or -1 if some constraint is
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52 * violated.
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53 */
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54 tpinterf_make_cmd(argv)
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55 char **argv;
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56 {
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57 int arglen;
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58 char **ap, *dp;
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59
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60 dp = cmdbuf;
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61 cmdlen = 0;
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62 for (ap = argv; *ap; ap++) {
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63 arglen = strlen(*ap);
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64 if (ap != argv)
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65 arglen++; /* separating space */
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66 if (arglen > MAXCMD - cmdlen)
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67 return(-1);
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68 if (!arg_chars_valid(*ap))
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69 return(-1);
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70 if (ap != argv)
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71 *dp++ = ' ';
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72 strcpy(dp, *ap);
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73 dp += strlen(*ap);
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74 cmdlen += arglen;
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75 }
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76 *dp++ = '\r';
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77 *dp = '\n';
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78 return(0);
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79 }
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80
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81 /*
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82 * This function sends the previously-constructed command to the target,
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83 * and collects the expected response.
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84 *
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85 * Return value: 0 if successful, -1 on errors (timeout or wrong response)
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86 */
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87 tpinterf_send_cmd()
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88 {
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89 char echobuf[MAXCMD+2];
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90 fd_set fds;
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91 struct timeval tv;
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92 int rcvd, cc;
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93
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94 write(target_fd, cmdbuf, cmdlen + 1);
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95 for (rcvd = 0; rcvd < cmdlen + 2; ) {
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96 FD_ZERO(&fds);
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97 FD_SET(target_fd, &fds);
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98 tv.tv_sec = 1;
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99 tv.tv_usec = 0;
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100 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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101 if (cc < 0) {
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102 if (errno == EINTR)
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103 continue;
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104 perror("select");
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105 exit(1);
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106 }
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107 if (cc < 1)
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108 return(-1);
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109 cc = read(target_fd, echobuf + rcvd, cmdlen + 2 - rcvd);
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110 if (cc <= 0) {
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111 perror("read after successful select");
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112 exit(1);
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113 }
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114 rcvd += cc;
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115 }
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116 if (bcmp(echobuf, cmdbuf, cmdlen + 2))
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117 return(-1);
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118 else
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119 return(0);
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120 }
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121
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122 /*
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123 * This functions reads the serial output from the target until a
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124 * '=' prompt is received. All intermediate output is passed to
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125 * stdout.
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126 *
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127 * Return value: 0 if '=' prompt received, -1 otherwise (timeout)
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128 */
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129 tpinterf_pass_output()
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130 {
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131 char buf[512], *cp;
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132 fd_set fds;
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133 struct timeval tv;
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134 int cc, newline = 1;
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135
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136 for (;;) {
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137 FD_ZERO(&fds);
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138 FD_SET(target_fd, &fds);
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139 tv.tv_sec = 1;
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140 tv.tv_usec = 0;
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141 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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142 if (cc < 0) {
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143 if (errno == EINTR)
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144 continue;
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145 perror("select");
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146 exit(1);
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147 }
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148 if (cc < 1)
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149 return(-1);
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150 cc = read(target_fd, buf, sizeof buf);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
151 if (cc <= 0) {
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
152 perror("read after successful select");
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
153 exit(1);
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
154 }
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
155 for (cp = buf; cc; cp++) {
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
156 cc--;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
157 if (*cp == '=' && newline && !cc)
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
158 return(0);
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
159 putchar(*cp);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
160 if (*cp == '\n')
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
161 newline = 1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
162 else
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
163 newline = 0;
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
164 }
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
165 }
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
166 }