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Code /*****************************************************************************/ /* * usbmisc.c -- Misc USB routines * * Copyright (C) 2003 Aurelien Jarno (aurelien@aurel32.net) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * */ /*****************************************************************************/ #include <stdio.h> #include <string.h> #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "usbmisc.h" /* ---------------------------------------------------------------------- */ static const char *devbususb = "/dev/bus/usb"; /* ---------------------------------------------------------------------- */ static int readlink_recursive(const char *path, char *buf, size_t bufsize) { char temp[PATH_MAX + 1]; char *ptemp; int ret; ret = readlink(path, buf, bufsize); if (ret > 0) { buf[ret] = 0; if (*buf != '/') { strncpy(temp, path, sizeof(temp)); ptemp = temp + strlen(temp); while (*ptemp != '/' && ptemp != temp) ptemp--; ptemp++; strncpy(ptemp, buf, bufsize + temp - ptemp); } else strncpy(temp, buf, sizeof(temp)); return readlink_recursive(temp, buf, bufsize); } else { strncpy(buf, path, bufsize); return strlen(buf); } } static char *get_absolute_path(const char *path, char *result, size_t result_size) { const char *ppath; /* pointer on the input string */ char *presult; /* pointer on the output string */ ppath = path; presult = result; result[0] = 0; if (path == NULL) return result; if (*ppath != '/') { result = getcwd(result, result_size); presult += strlen(result); result_size -= strlen(result); *presult++ = '/'; result_size--; } while (*ppath != 0 && result_size > 1) { if (*ppath == '/') { do ppath++; while (*ppath == '/'); *presult++ = '/'; result_size--; } else if (*ppath == '.' && *(ppath + 1) == '.' && *(ppath + 2) == '/' && *(presult - 1) == '/') { if ((presult - 1) != result) { /* go one directory upper */ do { presult--; result_size++; } while (*(presult - 1) != '/'); } ppath += 3; } else if (*ppath == '.' && *(ppath + 1) == '/' && *(presult - 1) == '/') { ppath += 2; } else { *presult++ = *ppath++; result_size--; } } /* Don't forget to mark the end of the string! */ *presult = 0; return result; } struct usb_device *get_usb_device(const char *path) { struct usb_bus *bus; struct usb_device *dev; char device_path[PATH_MAX + 1]; char absolute_path[PATH_MAX + 1]; readlink_recursive(path, device_path, sizeof(device_path)); get_absolute_path(device_path, absolute_path, sizeof(absolute_path)); for (bus = usb_busses; bus; bus = bus->next) { for (dev = bus->devices; dev; dev = dev->next) { snprintf(device_path, sizeof(device_path), "%s/%s/%s", devbususb, bus->dirname, dev->filename); if (!strcmp(device_path, absolute_path)) return dev; } } return NULL; }
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