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/*
* The PCI Library -- Parsing of the ID list
*
* Copyright (c) 1997--2008 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "internal.h"
#include "names.h"
#ifdef PCI_COMPRESSED_IDS
#include <zlib.h>
typedef gzFile pci_file;
#define pci_gets(f, l, s) gzgets(f, l, s)
#define pci_eof(f) gzeof(f)
static pci_file pci_open(struct pci_access *a)
{
pci_file result;
size_t len;
char *new_name;
result = gzopen(a->id_file_name, "rb");
if (result)
return result;
len = strlen(a->id_file_name);
if (len < 3 || memcmp(a->id_file_name + len - 3, ".gz", 3) != 0)
return result;
new_name = malloc(len - 2);
memcpy(new_name, a->id_file_name, len - 3);
new_name[len - 3] = 0;
pci_set_name_list_path(a, new_name, 1);
return gzopen(a->id_file_name, "rb");
}
#define pci_close(f) gzclose(f)
#define PCI_ERROR(f, err) \
if (!err) { \
int errnum = 0; \
gzerror(f, &errnum); \
if (errnum >= 0) err = NULL; \
else if (errnum == Z_ERRNO) err = "I/O error"; \
else err = zError(errnum); \
}
#else
typedef FILE * pci_file;
#define pci_gets(f, l, s) fgets(l, s, f)
#define pci_eof(f) feof(f)
#define pci_open(a) fopen(a->id_file_name, "r")
#define pci_close(f) fclose(f)
#define PCI_ERROR(f, err) if (!err && ferror(f)) err = "I/O error";
#endif
static int id_hex(char *p, int cnt)
{
int x = 0;
while (cnt--)
{
x <<= 4;
if (*p >= '0' && *p <= '9')
x += (*p - '0');
else if (*p >= 'a' && *p <= 'f')
x += (*p - 'a' + 10);
else if (*p >= 'A' && *p <= 'F')
x += (*p - 'A' + 10);
else
return -1;
p++;
}
return x;
}
static inline int id_white_p(int c)
{
return (c == ' ') || (c == '\t');
}
static const char *id_parse_list(struct pci_access *a, pci_file f, int *lino)
{
char line[MAX_LINE];
char *p;
int id1=0, id2=0, id3=0, id4=0;
int cat = -1;
int nest;
static const char parse_error[] = "Parse error";
*lino = 0;
while (pci_gets(f, line, sizeof(line)))
{
(*lino)++;
p = line;
while (*p && *p != '\n' && *p != '\r')
p++;
if (!*p && !pci_eof(f))
return "Line too long";
*p = 0;
if (p > line && (p[-1] == ' ' || p[-1] == '\t'))
*--p = 0;
p = line;
while (id_white_p(*p))
p++;
if (!*p || *p == '#')
continue;
p = line;
while (*p == '\t')
p++;
nest = p - line;
if (!nest) /* Top-level entries */
{
if (p[0] == 'C' && p[1] == ' ') /* Class block */
{
if ((id1 = id_hex(p+2, 2)) < 0 || !id_white_p(p[4]))
return parse_error;
cat = ID_CLASS;
p += 5;
}
else if (p[0] == 'S' && p[1] == ' ')
{ /* Generic subsystem block */
if ((id1 = id_hex(p+2, 4)) < 0 || p[6])
return parse_error;
if (!pci_id_lookup(a, 0, ID_VENDOR, id1, 0, 0, 0))
return "Vendor does not exist";
cat = ID_GEN_SUBSYSTEM;
continue;
}
else if (p[0] >= 'A' && p[0] <= 'Z' && p[1] == ' ')
{ /* Unrecognized block (RFU) */
cat = ID_UNKNOWN;
continue;
}
else /* Vendor ID */
{
if ((id1 = id_hex(p, 4)) < 0 || !id_white_p(p[4]))
return parse_error;
cat = ID_VENDOR;
p += 5;
}
id2 = id3 = id4 = 0;
}
else if (cat == ID_UNKNOWN) /* Nested entries in RFU blocks are skipped */
continue;
else if (nest == 1) /* Nesting level 1 */
switch (cat)
{
case ID_VENDOR:
case ID_DEVICE:
case ID_SUBSYSTEM:
if ((id2 = id_hex(p, 4)) < 0 || !id_white_p(p[4]))
return parse_error;
p += 5;
cat = ID_DEVICE;
id3 = id4 = 0;
break;
case ID_GEN_SUBSYSTEM:
if ((id2 = id_hex(p, 4)) < 0 || !id_white_p(p[4]))
return parse_error;
p += 5;
id3 = id4 = 0;
break;
case ID_CLASS:
case ID_SUBCLASS:
case ID_PROGIF:
if ((id2 = id_hex(p, 2)) < 0 || !id_white_p(p[2]))
return parse_error;
p += 3;
cat = ID_SUBCLASS;
id3 = id4 = 0;
break;
default:
return parse_error;
}
else if (nest == 2) /* Nesting level 2 */
switch (cat)
{
case ID_DEVICE:
case ID_SUBSYSTEM:
if ((id3 = id_hex(p, 4)) < 0 || !id_white_p(p[4]) || (id4 = id_hex(p+5, 4)) < 0 || !id_white_p(p[9]))
return parse_error;
p += 10;
cat = ID_SUBSYSTEM;
break;
case ID_CLASS:
case ID_SUBCLASS:
case ID_PROGIF:
if ((id3 = id_hex(p, 2)) < 0 || !id_white_p(p[2]))
return parse_error;
p += 3;
cat = ID_PROGIF;
id4 = 0;
break;
default:
return parse_error;
}
else /* Nesting level 3 or more */
return parse_error;
while (id_white_p(*p))
p++;
if (!*p)
return parse_error;
if (pci_id_insert(a, cat, id1, id2, id3, id4, p, SRC_LOCAL))
return "Duplicate entry";
}
return NULL;
}
int
pci_load_name_list(struct pci_access *a)
{
pci_file f;
int lino;
const char *err;
pci_free_name_list(a);
a->id_load_failed = 1;
if (!(f = pci_open(a)))
return 0;
err = id_parse_list(a, f, &lino);
PCI_ERROR(f, err);
pci_close(f);
if (err)
a->error("%s at %s, line %d\n", err, a->id_file_name, lino);
a->id_load_failed = 0;
return 1;
}
void
pci_free_name_list(struct pci_access *a)
{
pci_id_cache_flush(a);
pci_id_hash_free(a);
pci_id_hwdb_free(a);
a->id_load_failed = 0;
}
void
pci_set_name_list_path(struct pci_access *a, char *name, int to_be_freed)
{
if (a->free_id_name)
free(a->id_file_name);
a->id_file_name = name;
a->free_id_name = to_be_freed;
}
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