lib/names-parse.c

   1 /*
   2  *      The PCI Library -- Parsing of the ID list
   3  *
   4  *      Copyright (c) 1997--2008 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <errno.h>
  13
  14 #include "internal.h"
  15 #include "names.h"
  16
  17 #ifdef PCI_COMPRESSED_IDS
  18 #include <zlib.h>
  19 typedef gzFile pci_file;
  20 #define pci_gets(f, l, s)       gzgets(f, l, s)
  21 #define pci_eof(f)              gzeof(f)
  22
  23 static pci_file pci_open(struct pci_access *a)
  24 {
  25   pci_file result;
  26   size_t len;
  27   char *new_name;
  28
  29   result = gzopen(a->id_file_name, "rb");
  30   if (result)
  31     return result;
  32   len = strlen(a->id_file_name);
  33   if (len < 3 || memcmp(a->id_file_name + len - 3, ".gz", 3) != 0)
  34     return result;
  35   new_name = malloc(len - 2);
  36   memcpy(new_name, a->id_file_name, len - 3);
  37   new_name[len - 3] = 0;
  38   pci_set_name_list_path(a, new_name, 1);
  39   return gzopen(a->id_file_name, "rb");
  40 }
  41
  42 #define pci_close(f)            gzclose(f)
  43 #define PCI_ERROR(f, err)                                               \
  44         if (!err) {                                                     \
  45                 int errnum;                                             \
  46                 gzerror(f, &errnum);                                    \
  47                 if (errnum >= 0) err = NULL;                            \
  48                 else if (errnum == Z_ERRNO) err = "I/O error";          \
  49                 else err = zError(errnum);                              \
  50         }
  51 #else
  52 typedef FILE * pci_file;
  53 #define pci_gets(f, l, s)       fgets(l, s, f)
  54 #define pci_eof(f)              feof(f)
  55 #define pci_open(a)             fopen(a->id_file_name, "r")
  56 #define pci_close(f)            fclose(f)
  57 #define PCI_ERROR(f, err)       if (!err && ferror(f))  err = "I/O error";
  58 #endif
  59
  60 static int id_hex(char *p, int cnt)
  61 {
  62   int x = 0;
  63   while (cnt--)
  64     {
  65       x <<= 4;
  66       if (*p >= '0' && *p <= '9')
  67         x += (*p - '0');
  68       else if (*p >= 'a' && *p <= 'f')
  69         x += (*p - 'a' + 10);
  70       else if (*p >= 'A' && *p <= 'F')
  71         x += (*p - 'A' + 10);
  72       else
  73         return -1;
  74       p++;
  75     }
  76   return x;
  77 }
  78
  79 static inline int id_white_p(int c)
  80 {
  81   return (c == ' ') || (c == '\t');
  82 }
  83
  84
  85 static const char *id_parse_list(struct pci_access *a, pci_file f, int *lino)
  86 {
  87   char line[MAX_LINE];
  88   char *p;
  89   int id1=0, id2=0, id3=0, id4=0;
  90   int cat = -1;
  91   int nest;
  92   static const char parse_error[] = "Parse error";
  93
  94   *lino = 0;
  95   while (pci_gets(f, line, sizeof(line)))
  96     {
  97       (*lino)++;
  98       p = line;
  99       while (*p && *p != '\n' && *p != '\r')
 100         p++;
 101       if (!*p && !pci_eof(f))
 102         return "Line too long";
 103       *p = 0;
 104       if (p > line && (p[-1] == ' ' || p[-1] == '\t'))
 105         *--p = 0;
 106
 107       p = line;
 108       while (id_white_p(*p))
 109         p++;
 110       if (!*p || *p == '#')
 111         continue;
 112
 113       p = line;
 114       while (*p == '\t')
 115         p++;
 116       nest = p - line;
 117
 118       if (!nest)                                        /* Top-level entries */
 119         {
 120           if (p[0] == 'C' && p[1] == ' ')               /* Class block */
 121             {
 122               if ((id1 = id_hex(p+2, 2)) < 0 || !id_white_p(p[4]))
 123                 return parse_error;
 124               cat = ID_CLASS;
 125               p += 5;
 126             }
 127           else if (p[0] == 'S' && p[1] == ' ')
 128             {                                           /* Generic subsystem block */
 129               if ((id1 = id_hex(p+2, 4)) < 0 || p[6])
 130                 return parse_error;
 131               if (!pci_id_lookup(a, 0, ID_VENDOR, id1, 0, 0, 0))
 132                 return "Vendor does not exist";
 133               cat = ID_GEN_SUBSYSTEM;
 134               continue;
 135             }
 136           else if (p[0] >= 'A' && p[0] <= 'Z' && p[1] == ' ')
 137             {                                           /* Unrecognized block (RFU) */
 138               cat = ID_UNKNOWN;
 139               continue;
 140             }
 141           else                                          /* Vendor ID */
 142             {
 143               if ((id1 = id_hex(p, 4)) < 0 || !id_white_p(p[4]))
 144                 return parse_error;
 145               cat = ID_VENDOR;
 146               p += 5;
 147             }
 148           id2 = id3 = id4 = 0;
 149         }
 150       else if (cat == ID_UNKNOWN)                       /* Nested entries in RFU blocks are skipped */
 151         continue;
 152       else if (nest == 1)                               /* Nesting level 1 */
 153         switch (cat)
 154           {
 155           case ID_VENDOR:
 156           case ID_DEVICE:
 157           case ID_SUBSYSTEM:
 158             if ((id2 = id_hex(p, 4)) < 0 || !id_white_p(p[4]))
 159               return parse_error;
 160             p += 5;
 161             cat = ID_DEVICE;
 162             id3 = id4 = 0;
 163             break;
 164           case ID_GEN_SUBSYSTEM:
 165             if ((id2 = id_hex(p, 4)) < 0 || !id_white_p(p[4]))
 166               return parse_error;
 167             p += 5;
 168             id3 = id4 = 0;
 169             break;
 170           case ID_CLASS:
 171           case ID_SUBCLASS:
 172           case ID_PROGIF:
 173             if ((id2 = id_hex(p, 2)) < 0 || !id_white_p(p[2]))
 174               return parse_error;
 175             p += 3;
 176             cat = ID_SUBCLASS;
 177             id3 = id4 = 0;
 178             break;
 179           default:
 180             return parse_error;
 181           }
 182       else if (nest == 2)                               /* Nesting level 2 */
 183         switch (cat)
 184           {
 185           case ID_DEVICE:
 186           case ID_SUBSYSTEM:
 187             if ((id3 = id_hex(p, 4)) < 0 || !id_white_p(p[4]) || (id4 = id_hex(p+5, 4)) < 0 || !id_white_p(p[9]))
 188               return parse_error;
 189             p += 10;
 190             cat = ID_SUBSYSTEM;
 191             break;
 192           case ID_CLASS:
 193           case ID_SUBCLASS:
 194           case ID_PROGIF:
 195             if ((id3 = id_hex(p, 2)) < 0 || !id_white_p(p[2]))
 196               return parse_error;
 197             p += 3;
 198             cat = ID_PROGIF;
 199             id4 = 0;
 200             break;
 201           default:
 202             return parse_error;
 203           }
 204       else                                              /* Nesting level 3 or more */
 205         return parse_error;
 206       while (id_white_p(*p))
 207         p++;
 208       if (!*p)
 209         return parse_error;
 210       if (pci_id_insert(a, cat, id1, id2, id3, id4, p, SRC_LOCAL))
 211         return "Duplicate entry";
 212     }
 213   return NULL;
 214 }
 215
 216 int
 217 pci_load_name_list(struct pci_access *a)
 218 {
 219   pci_file f;
 220   int lino;
 221   const char *err;
 222
 223   pci_free_name_list(a);
 224   a->id_load_failed = 1;
 225   if (!(f = pci_open(a)))
 226     return 0;
 227   err = id_parse_list(a, f, &lino);
 228   PCI_ERROR(f, err);
 229   pci_close(f);
 230   if (err)
 231     a->error("%s at %s, line %d\n", err, a->id_file_name, lino);
 232   a->id_load_failed = 0;
 233   return 1;
 234 }
 235
 236 void
 237 pci_free_name_list(struct pci_access *a)
 238 {
 239   pci_id_cache_flush(a);
 240   pci_id_hash_free(a);
 241   a->id_load_failed = 0;
 242 }
 243
 244 void
 245 pci_set_name_list_path(struct pci_access *a, char *name, int to_be_freed)
 246 {
 247   if (a->free_id_name)
 248     free(a->id_file_name);
 249   a->id_file_name = name;
 250   a->free_id_name = to_be_freed;
 251 }