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/*
* loadconfig.c
*
* Copyright 1995 H. Peter Anvin
*
* Load the configuration file
*/
#include "magicfilter.h"
#define MAX_LINE 4096 /* Size of line buffer */
#define die(M) do { fprintf(stderr, "%s:%d: %s\n", file, lineno, (M)); \
fclose(f); return NULL; } while(0);
/*
* char *magic_getline(FILE *f, char *file, int *lineno)
*
* Get a logical line from file f; returning a pointer to the allocated
* storage. Advance the line pointer by # of lines. file used for
* error messages.
*/
static char *magic_getline(FILE *f, char *file, int *line)
{
char *buf, *p;
int buflen, spc, ch, bslash;
int lineno = *line;
buf = p = malloc(BUFSIZ);
if ( !buf ) die("Out of memory");
buflen = spc = BUFSIZ;
bslash = 0;
while(1)
{
if ( !spc ) /* Risk for overrun? */
{
spc = p-buf;
if ( !(buf = realloc(buf, buflen += BUFSIZ)) )
die("Out of memory");
p = buf+spc;
spc = BUFSIZ;
}
ch = getc(f);
if ( ch == EOF )
{
if ( p == buf )
{
free(buf);
return NULL; /* EOF */
}
else
{
bslash = 0;
ch = '\n'; /* End of file -> end of line */
}
}
if ( ch == '\n' )
{
lineno++;
if ( bslash )
{
p--; /* Delete backslash-newline combo */
spc++;
while ( isspace(ch = getc(f)) ); /* Ignore leading whitespace */
ungetc(ch, f);
}
else
{
*p = '\0';
*line = lineno;
return buf;
}
}
else
{
bslash = (ch == '\\');
*(p++) = ch;
spc--;
}
}
}
/*
* struct datatype *load_config(char *file)
*
* Load the configuration file, returning the pointer to the lead node.
* In case of error, return NULL.
*
* The variable pointed to by in_block_size is set to the size needed
* for the input buffer.
*/
struct datatype *load_config(char *file, int *in_block_size)
{
FILE *f;
struct datatype *head = NULL; /* Head pointer to linked list */
struct datatype **next = &head; /* Chase pointer to store in order */
struct datatype *new;
char *line, *p;
int lineno = 0;
int bytes_needed = 0;
int offset;
int i;
f = fopen(file, "r");
if ( !f )
{
perror(file);
return NULL;
}
while ( (line = magic_getline(f, file, &lineno)) != NULL )
{
offset = getoffset(line, &p);
if ( offset == MAG_ERR ) die("Syntax error");
if ( offset != MAG_COMMENT )
{
new = (struct datatype *) malloc(sizeof(struct datatype));
if ( !new ) die("Out of memory");
if ( offset == MAG_DEFAULT )
{
new->offset = new->length = 0;
new->magic = new->mask = "";
}
else
{
i = getmagic(p, NULL, NULL, NULL); /* Get length of magic */
if ( i < 0 ) die("Syntax error");
new->offset = offset;
new->length = i;
new->magic = malloc(i);
new->mask = malloc(i);
if ( !(new->magic && new->mask) ) die("Out of memory");
if ( offset+i > bytes_needed )
bytes_needed = offset+i;
#if DEBUG > 3
fprintf(stderr,"magic bytes: %d\n", i);
#endif
getmagic(p, &p, new->magic, new->mask);
}
if ( (new->action = getaction(p, &p)) < 0 )
die("Invalid action");
if ( (i = strlen(p)) > 0 )
{
if ( !(new->command = malloc(i+1)) )
die("Out of memory");
strcpy(new->command, p);
}
else
new->command = "";
/* Complete the linked list */
new->next = NULL;
*next = new;
next = &(new->next);
#if DEBUG > 2
fprintf(stderr,"Added config entry: \n");
fprintf(stderr," offset = %d\n", new->offset);
fprintf(stderr," length = %d\n", new->length);
fprintf(stderr," action = %d\n", new->action);
fprintf(stderr," command = %s\n", new->command);
fprintf(stderr," bytes = ");
for ( i = 0 ; i < new->length ; i++ )
{
if ( (new->mask)[i] )
fprintf(stderr,"%03o ", (unsigned char)(new->magic)[i]);
else
fprintf(stderr,"??? ");
}
fprintf(stderr,"\n");
#endif
}
free(line);
}
fclose(f);
if ( in_block_size ) *in_block_size = bytes_needed;
return head;
}
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