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Diffstat (limited to 'src/util/dict_alloc.c')
| -rw-r--r-- | src/util/dict_alloc.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src/util/dict_alloc.c b/src/util/dict_alloc.c new file mode 100644 index 0000000..3285a38 --- /dev/null +++ b/src/util/dict_alloc.c @@ -0,0 +1,196 @@ +/*++ +/* NAME +/* dict_alloc 3 +/* SUMMARY +/* dictionary memory manager +/* SYNOPSIS +/* #include <dict.h> +/* +/* DICT *dict_alloc(dict_type, dict_name, size) +/* const char *dict_type; +/* const char *dict_name; +/* ssize_t size; +/* +/* void dict_free(dict) +/* DICT *ptr; +/* +/* void dict_jmp_alloc(dict) +/* DICT *ptr; +/* DESCRIPTION +/* dict_alloc() allocates memory for a dictionary structure of +/* \fIsize\fR bytes, initializes all generic dictionary +/* properties to default settings, +/* and installs default methods that do not support any operation. +/* The caller is supposed to override the default methods with +/* ones that it supports. +/* The purpose of the default methods is to trap an attempt to +/* invoke an unsupported method. +/* +/* One exception is the default lock function. When the +/* dictionary provides a file handle for locking, the default +/* lock function returns the result from myflock with the +/* locking method specified in the lock_type member, otherwise +/* it returns 0. Presently, the lock function is used only to +/* implement the DICT_FLAG_OPEN_LOCK feature (lock the database +/* exclusively after it is opened) for databases that are not +/* multi-writer safe. +/* +/* dict_free() releases memory and cleans up after dict_alloc(). +/* It is up to the caller to dispose of any memory that was allocated +/* by the caller. +/* +/* dict_jmp_alloc() implements preliminary support for exception +/* handling. This will eventually be built into dict_alloc(). +/* +/* Arguments: +/* .IP dict_type +/* The official name for this type of dictionary, as used by +/* dict_open(3) etc. This is stored under the \fBtype\fR +/* member. +/* .IP dict_name +/* Dictionary name. This is stored as the \fBname\fR member. +/* .IP size +/* The size in bytes of the dictionary subclass structure instance. +/* SEE ALSO +/* dict(3) +/* DIAGNOSTICS +/* Fatal errors: the process invokes a default method. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/* +/* Wietse Venema +/* Google, Inc. +/* 111 8th Avenue +/* New York, NY 10011, USA +/*--*/ + +/* System libraries. */ + +#include "sys_defs.h" + +/* Utility library. */ + +#include "msg.h" +#include "mymalloc.h" +#include "myflock.h" +#include "dict.h" + +/* dict_default_lookup - trap unimplemented operation */ + +static const char *dict_default_lookup(DICT *dict, const char *unused_key) +{ + msg_fatal("table %s:%s: lookup operation is not supported", + dict->type, dict->name); +} + +/* dict_default_update - trap unimplemented operation */ + +static int dict_default_update(DICT *dict, const char *unused_key, + const char *unused_value) +{ + msg_fatal("table %s:%s: update operation is not supported", + dict->type, dict->name); +} + +/* dict_default_delete - trap unimplemented operation */ + +static int dict_default_delete(DICT *dict, const char *unused_key) +{ + msg_fatal("table %s:%s: delete operation is not supported", + dict->type, dict->name); +} + +/* dict_default_sequence - trap unimplemented operation */ + +static int dict_default_sequence(DICT *dict, int unused_function, + const char **unused_key, const char **unused_value) +{ + msg_fatal("table %s:%s: sequence operation is not supported", + dict->type, dict->name); +} + +/* dict_default_lock - default lock handler */ + +static int dict_default_lock(DICT *dict, int operation) +{ + if (dict->lock_fd >= 0) { + return (myflock(dict->lock_fd, dict->lock_type, operation)); + } else { + return (0); + } +} + +/* dict_default_close - trap unimplemented operation */ + +static void dict_default_close(DICT *dict) +{ + msg_fatal("table %s:%s: close operation is not supported", + dict->type, dict->name); +} + +/* dict_alloc - allocate dictionary object, initialize super-class */ + +DICT *dict_alloc(const char *dict_type, const char *dict_name, ssize_t size) +{ + DICT *dict = (DICT *) mymalloc(size); + + dict->type = mystrdup(dict_type); + dict->name = mystrdup(dict_name); + dict->flags = DICT_FLAG_FIXED; + dict->lookup = dict_default_lookup; + dict->update = dict_default_update; + dict->delete = dict_default_delete; + dict->sequence = dict_default_sequence; + dict->close = dict_default_close; + dict->lock = dict_default_lock; + dict->lock_type = INTERNAL_LOCK; + dict->lock_fd = -1; + dict->stat_fd = -1; + dict->mtime = 0; + dict->fold_buf = 0; + dict->owner.status = DICT_OWNER_UNKNOWN; + dict->owner.uid = INT_MAX; + dict->error = DICT_ERR_NONE; + dict->jbuf = 0; + dict->utf8_backup = 0; + dict->file_buf = 0; + dict->file_b64 = 0; + return dict; +} + +/* dict_free - super-class destructor */ + +void dict_free(DICT *dict) +{ + myfree(dict->type); + myfree(dict->name); + if (dict->jbuf) + myfree((void *) dict->jbuf); + if (dict->utf8_backup) + myfree((void *) dict->utf8_backup); + if (dict->file_buf) + vstring_free(dict->file_buf); + if (dict->file_b64) + vstring_free(dict->file_b64); + myfree((void *) dict); +} + + /* + * TODO: add a dict_flags() argument to dict_alloc() and handle jump buffer + * allocation there. + */ + +/* dict_jmp_alloc - enable exception handling */ + +void dict_jmp_alloc(DICT *dict) +{ + if (dict->jbuf == 0) + dict->jbuf = (DICT_JMP_BUF *) mymalloc(sizeof(DICT_JMP_BUF)); +} |