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annotate libuwrap/find_busdev.c @ 101:ba741a1af0e3

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doc/CP2102-EEPROM-tools: article started
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 28 Sep 2023 06:35:39 +0000
parents fd3fcba5a8ac
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 bus and device number/filename strings.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <usb.h>
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11 #include "find_dev.h"
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12 #include "prelim_init.h"
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14 struct usb_device *
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15 find_usbdev_by_busdev(const char *bus_dev_spec)
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16 {
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17 const char *slash;
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18 unsigned bus_name_len;
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19 struct usb_bus *bus;
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20 struct usb_device *dev;
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21
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22 slash = index(bus_dev_spec, '/');
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23 if (!slash) {
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24 fprintf(stderr,
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25 "error: bus/dev path expected, but no slash found\n");
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26 exit(1);
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27 }
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28 bus_name_len = slash - bus_dev_spec;
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29 libusb_prelim_init();
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30 for (bus = usb_get_busses(); bus; bus = bus->next) {
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31 if (strlen(bus->dirname) != bus_name_len)
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32 continue;
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33 if (strncmp(bus->dirname, bus_dev_spec, bus_name_len))
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34 continue;
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35 for (dev = bus->devices; dev; dev = dev->next) {
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36 if (!strcmp(dev->filename, slash + 1))
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37 return dev;
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38 }
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39 }
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40 return 0;
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41 }