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/* idfile.c -- read & write mkid database file header
Copyright (C) 1986, 1995 Greg McGary
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, 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; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include "alloc.h"
#include "idfile.h"
#include "idarg.h"
#include "strxtra.h"
static int io_idhead (FILE *fp, int (*io) (FILE *, void *, unsigned int, int), struct idhead *idh);
static int io_write (FILE *output_FILE, void *addr, unsigned int size, int is_int);
static int io_read (FILE *input_FILE, void *addr, unsigned int size, int is_int);
static int io_size (FILE *, void *, unsigned int size, int);
extern char *program_name;
/* init_id opens id_file, reads the header into idhp (and verifies the magic
* number), then builds the id_args list holding the names of all the
* files recorded in the database.
*/
FILE *
init_idfile (char const *id_file, struct idhead *idh, struct idarg **id_args)
{
FILE *id_FILE;
unsigned int i;
char *strings;
struct idarg *ida;
id_FILE = fopen (id_file, "r");
if (id_FILE == NULL)
return NULL;
read_idhead (id_FILE, idh);
if (idh->idh_magic[0] != IDH_MAGIC_0 || idh->idh_magic[1] != IDH_MAGIC_1)
{
fprintf (stderr, "%s: Not an id file: `%s'\n", program_name, id_file);
exit (1);
}
if (idh->idh_version != IDH_VERSION)
{
fprintf (stderr, "%s: ID version mismatch (want: %d, got: %d)\n", program_name, IDH_VERSION, idh->idh_version);
exit (1);
}
fseek (id_FILE, idh->idh_args_offset, 0);
strings = malloc (i = idh->idh_tokens_offset - idh->idh_args_offset);
fread (strings, i, 1, id_FILE);
ida = *id_args = CALLOC (struct idarg, idh->idh_paths);
for (i = 0; i < idh->idh_paths; i++)
{
while (*strings == '+' || *strings == '-')
{
while (*strings++)
;
}
ida->ida_flags = 0;
ida->ida_arg = strings;
ida->ida_next = ida + 1;
ida->ida_index = i;
ida++;
while (*strings++)
;
}
(--ida)->ida_next = NULL;
return id_FILE;
}
int
read_idhead (FILE *input_FILE, struct idhead *idh)
{
return io_idhead (input_FILE, io_read, idh);
}
int
write_idhead (FILE *input_FILE, struct idhead *idh)
{
return io_idhead (input_FILE, io_write, idh);
}
int
sizeof_idhead ()
{
return io_idhead (0, io_size, 0);
}
static int
io_size (FILE *ignore_FILE, void *ignore_addr, unsigned int size, int ignore_int)
{
return size;
}
static int
io_read (FILE *input_FILE, void *addr, unsigned int size, int is_int)
{
if (is_int)
{
switch (size)
{
case 4: /* This must be a literal 4. Don't use sizeof (uintmin32_t)! */
*(uintmin32_t *)addr = getc (input_FILE);
*(uintmin32_t *)addr += getc (input_FILE) << 010;
*(uintmin32_t *)addr += getc (input_FILE) << 020;
*(uintmin32_t *)addr += getc (input_FILE) << 030;
break;
case 2:
*(unsigned short *)addr = getc (input_FILE);
*(unsigned short *)addr += getc (input_FILE) << 010;
break;
case 1:
*(unsigned char *)addr = getc (input_FILE);
break;
default:
fprintf (stderr, "Unsupported size in io_write (): %d\n", size);
abort ();
}
}
else if (size > 1)
fread (addr, size, 1, input_FILE);
else
*(char *)addr = getc (input_FILE);
return size;
}
static int
io_write (FILE *output_FILE, void *addr, unsigned int size, int is_int)
{
if (is_int)
{
switch (size)
{
case 4: /* This must be a literal 4. Don't use sizeof (uintmin32_t)! */
putc (*(uintmin32_t *)addr, output_FILE);
putc (*(uintmin32_t *)addr >> 010, output_FILE);
putc (*(uintmin32_t *)addr >> 020, output_FILE);
putc (*(uintmin32_t *)addr >> 030, output_FILE);
break;
case 2:
putc (*(unsigned short *)addr, output_FILE);
putc (*(unsigned short *)addr >> 010, output_FILE);
break;
case 1:
putc (*(unsigned char *)addr, output_FILE);
break;
default:
fprintf (stderr, "Unsupported size in io_write (): %d\n", size);
abort ();
}
}
else if (size > 1)
fwrite (addr, size, 1, output_FILE);
else
putc (*(char *)addr, output_FILE);
return size;
}
/* The sizes of the fields must be hard-coded. They aren't
necessarily the sizes of the struct members, because some
architectures don't have any way to declare 4-byte integers
(e.g., Cray) */
static int
io_idhead (FILE *fp, int (*io) (FILE *, void *, unsigned int, int), struct idhead *idh)
{
unsigned int size = 0;
if (fp)
fseek (fp, 0L, 0);
size += io (fp, idh->idh_magic, 2, 0);
size += io (fp, &idh->idh_pad_1, 1, 0);
size += io (fp, &idh->idh_version, 1, 0);
size += io (fp, &idh->idh_flags, 2, 1);
size += io (fp, &idh->idh_args, 4, 1);
size += io (fp, &idh->idh_paths, 4, 1);
size += io (fp, &idh->idh_tokens, 4, 1);
size += io (fp, &idh->idh_buf_size, 4, 1);
size += io (fp, &idh->idh_vec_size, 4, 1);
size += io (fp, &idh->idh_args_offset, 4, 1);
size += io (fp, &idh->idh_tokens_offset, 4, 1);
size += io (fp, &idh->idh_end_offset, 4, 1);
return size;
}
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