FreeCalypso > hg > fc-usbser-tools

annotate libuwrap/find_desc_str.c @ 11:fe4231326fb2

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libuwrap: implement locating by description-string
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 07 Sep 2023 04:58:16 +0000
parents libuwrap/find_matchspec.c@ab506f6aa57c
children
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1 /*
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2 * In this module we implement the function that locates a USB device
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3 * by libftdi-style description-string.
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4 */
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5
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6 #include <ctype.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <usb.h>
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12 #include "find_dev.h"
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13
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14 struct usb_device *
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15 find_usbdev_by_desc_string(const char *desc_string)
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16 {
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17 struct usbdev_matchspec match;
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18 const char *cp;
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19 char *endp;
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20
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21 if (!desc_string[0] || desc_string[1] != ':') {
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22 inv_syntax: fprintf(stderr,
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23 "error: USB device selector string has invalid syntax\n");
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24 exit(1);
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25 }
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26 switch (desc_string[0]) {
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27 case 'd':
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28 return find_usbdev_by_busdev(desc_string + 2);
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29 case 'i':
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30 case 's':
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31 break;
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32 default:
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33 goto inv_syntax;
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34 }
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35 bzero(&match, sizeof match);
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36 cp = desc_string + 2;
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37 if (!isdigit(*cp))
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38 goto inv_syntax;
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39 match.usb_vid = strtoul(cp, &endp, 0);
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40 cp = endp;
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41 if (*cp++ != ':')
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42 goto inv_syntax;
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43 if (!isdigit(*cp))
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44 goto inv_syntax;
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45 match.usb_pid = strtoul(cp, &endp, 0);
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46 cp = endp;
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47 if (!*cp) {
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48 if (desc_string[0] != 'i')
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49 goto inv_syntax;
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50 return find_usbdev_by_matchspec(&match);
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51 }
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52 if (*cp++ != ':')
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53 goto inv_syntax;
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54 switch (desc_string[0]) {
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55 case 'i':
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56 if (!isdigit(*cp))
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57 goto inv_syntax;
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58 match.index = strtoul(cp, &endp, 0);
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59 if (*endp)
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60 goto inv_syntax;
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61 break;
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62 case 's':
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63 match.serial = cp;
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64 }
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65 return find_usbdev_by_matchspec(&match);
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66 }