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add MDBPATH search

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fix segfault in mdb-tables
This commit is contained in:
brianb
2003-01-05 23:49:56 +00:00
parent c6da2f1845
commit 52528c6e95
5 changed files with 79 additions and 22 deletions
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79
src/libmdb/file.c
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@@ -27,36 +27,89 @@ MdbFormatConstants MdbJet3Constants = {
};
static size_t _mdb_read_pg(MdbHandle *mdb, unsigned char *pg_buf, unsigned long pg);
static int mdb_find_file(char *file_name, char *file_path, int bufsize)
{
struct stat status;
gchar *s, *mdbpath;
gchar *dir, *tmpfname;
int ret;
/* try the provided file name first */
if (!stat(file_name, &status)) {
if (strlen(file_name)> bufsize)
return strlen(file_name);
strcpy(file_path, file_name);
return 0;
}
/* Now pull apart $MDBPATH and try those */
s = (gchar *) getenv("MDBPATH");
if (!s || !strlen(s)) return -1; /* no path, can't find file */
mdbpath = g_strdup(s);
dir = strtok(mdbpath,":");
do {
tmpfname = (gchar *) g_malloc(strlen(dir)+strlen(file_name)+2);
strcpy(tmpfname, dir);
if (dir[strlen(dir)-1]!='/') strcat(tmpfname, "/");
strcat(tmpfname, file_name);
if (!stat(tmpfname, &status)) {
if (strlen(tmpfname)> bufsize) {
ret = strlen(tmpfname);
g_free(tmpfname);
return ret;
}
strcpy(file_path, tmpfname);
g_free(tmpfname);
return 0;
}
g_free(tmpfname);
} while (dir = strtok(NULL, ":"));
return -1;
}
MdbHandle *_mdb_open(char *filename, gboolean writable)
{
MdbHandle *mdb;
int key[] = {0x86, 0xfb, 0xec, 0x37, 0x5d, 0x44, 0x9c, 0xfa, 0xc6, 0x5e, 0x28, 0xe6, 0x13, 0xb6};
int j,pos;
int bufsize;
MdbFile *f;
mdb = mdb_alloc_handle();
/* need something to bootstrap with, reassign after page 0 is read */
mdb->fmt = &MdbJet3Constants;
mdb->f = mdb_alloc_file();
mdb->f->filename = (char *) malloc(strlen(filename)+1);
strcpy(mdb->f->filename, filename);
f = mdb->f;
f->filename = (char *) malloc(strlen(filename)+1);
bufsize = strlen(filename)+1;
bufsize = mdb_find_file(filename, f->filename, bufsize);
if (bufsize) {
f->filename = (char *) realloc(f->filename, bufsize+1);
bufsize = mdb_find_file(filename, f->filename, bufsize);
if (bufsize) {
fprintf(stderr, "Can't alloc filename\n");
mdb_free_handle(mdb);
return NULL;
}
}
//strcpy(f->filename, filename);
if (writable) {
mdb->f->writable = TRUE;
mdb->f->fd = open(filename,O_RDWR);
f->writable = TRUE;
f->fd = open(f->filename,O_RDWR);
} else {
mdb->f->fd = open(filename,O_RDONLY);
f->fd = open(f->filename,O_RDONLY);
}
if (mdb->f->fd==-1) {
/* fprintf(stderr,"Couldn't open file %s\n",filename); */
if (f->fd==-1) {
fprintf(stderr,"Couldn't open file %s\n",f->filename);
return NULL;
}
mdb->f->refs++;
f->refs++;
if (!mdb_read_pg(mdb, 0)) {
fprintf(stderr,"Couldn't read first page.\n");
return NULL;
}
mdb->f->jet_version = mdb_get_int32(mdb, 0x14);
f->jet_version = mdb_get_int32(mdb, 0x14);
if (IS_JET4(mdb)) {
mdb->fmt = &MdbJet4Constants;
} else {
@@ -64,8 +117,8 @@ int j,pos;
}
/* get the db encryption key and xor it back to clear text */
mdb->f->db_key = mdb_get_int32(mdb, 0x3e);
mdb->f->db_key ^= 0xe15e01b9;
f->db_key = mdb_get_int32(mdb, 0x3e);
f->db_key ^= 0xe15e01b9;
/* get the db password located at 0x42 bytes into the file */
@@ -73,9 +126,9 @@ int j,pos;
j = mdb_get_int32(mdb,0x42+pos);
j ^= key[pos];
if ( j != 0)
mdb->f->db_passwd[pos] = j;
f->db_passwd[pos] = j;
else
mdb->f->db_passwd[pos] = '\0';
f->db_passwd[pos] = '\0';
}
return mdb;