diff options
Diffstat (limited to 'src/libstrongswan/utils/enumerator.c')
-rw-r--r-- | src/libstrongswan/utils/enumerator.c | 364 |
1 files changed, 357 insertions, 7 deletions
diff --git a/src/libstrongswan/utils/enumerator.c b/src/libstrongswan/utils/enumerator.c index 842a2e997..cac5d73fa 100644 --- a/src/libstrongswan/utils/enumerator.c +++ b/src/libstrongswan/utils/enumerator.c @@ -1,10 +1,3 @@ -/** - * @file enumerator.c - * - * @brief Implementation of enumerator_t. - * - */ - /* * Copyright (C) 2007 Martin Willi * Hochschule fuer Technik Rapperswil @@ -18,10 +11,20 @@ * 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. + * + * $Id: enumerator.c 3589 2008-03-13 14:14:44Z martin $ */ #include "enumerator.h" +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <stdio.h> +#include <dirent.h> +#include <errno.h> + +#include <debug.h> /** * Implementation of enumerator_create_empty().enumerate @@ -42,3 +45,350 @@ enumerator_t* enumerator_create_empty() return this; } +/** + * Enumerator implementation for directory enumerator + */ +typedef struct { + /** implements enumerator_t */ + enumerator_t public; + /** directory handle */ + DIR *dir; + /** absolute path of current file */ + char full[PATH_MAX]; + /** where directory part of full ends and relative file gets written */ + char *full_end; +} dir_enum_t; + +/** + * Implementation of enumerator_create_directory().destroy + */ +static void destroy_dir_enum(dir_enum_t *this) +{ + closedir(this->dir); + free(this); +} + +/** + * Implementation of enumerator_create_directory().enumerate + */ +static bool enumerate_dir_enum(dir_enum_t *this, char **relative, + char **absolute, struct stat *st) +{ + struct dirent *entry = readdir(this->dir); + size_t len, remaining; + + if (!entry) + { + return FALSE; + } + if (streq(entry->d_name, ".") || streq(entry->d_name, "..")) + { + return enumerate_dir_enum(this, relative, absolute, st); + } + if (relative) + { + *relative = entry->d_name; + } + if (absolute || st) + { + remaining = sizeof(this->full) - (this->full_end - this->full); + len = snprintf(this->full_end, remaining, "%s", entry->d_name); + if (len < 0 || len >= remaining) + { + DBG1("buffer too small to enumerate file '%s'", entry->d_name); + return FALSE; + } + if (absolute) + { + *absolute = this->full; + } + if (st) + { + if (stat(this->full, st)) + { + DBG1("stat() on '%s' failed: %s", this->full, strerror(errno)); + return FALSE; + } + } + } + return TRUE; +} + +/** + * See header + */ +enumerator_t* enumerator_create_directory(char *path) +{ + size_t len; + dir_enum_t *this = malloc_thing(dir_enum_t); + this->public.enumerate = (void*)enumerate_dir_enum; + this->public.destroy = (void*)destroy_dir_enum; + + if (*path == '\0') + { + path = "./"; + } + len = snprintf(this->full, sizeof(this->full)-1, "%s", path); + if (len < 0 || len >= sizeof(this->full)-1) + { + DBG1("path string %s too long", path); + free(this); + return NULL; + } + /* append a '/' if not already done */ + if (this->full[len-1] != '/') + { + this->full[len++] = '/'; + this->full[len] = '\0'; + } + this->full_end = &this->full[len]; + + this->dir = opendir(path); + if (this->dir == NULL) + { + DBG1("opening directory %s failed: %s", path, strerror(errno)); + free(this); + return NULL; + } + return &this->public; +} + +/** + * enumerator for nested enumerations + */ +typedef struct { + /* implements enumerator_t */ + enumerator_t public; + /* outer enumerator */ + enumerator_t *outer; + /* inner enumerator */ + enumerator_t *inner; + /* constructor for inner enumerator */ + enumerator_t *(*create_inner)(void *outer, void *data); + /* data to pass to constructor above */ + void *data; + /* destructor for data */ + void (*destroy_data)(void *data); +} nested_enumerator_t; + + +/** + * Implementation of enumerator_create_nested().enumerate() + */ +static bool enumerate_nested(nested_enumerator_t *this, void *v1, void *v2, + void *v3, void *v4, void *v5) +{ + while (TRUE) + { + while (this->inner == NULL) + { + void *outer; + + if (!this->outer->enumerate(this->outer, &outer)) + { + return FALSE; + } + this->inner = this->create_inner(outer, this->data); + } + if (this->inner->enumerate(this->inner, v1, v2, v3, v4, v5)) + { + return TRUE; + } + this->inner->destroy(this->inner); + this->inner = NULL; + } +} + +/** + * Implementation of enumerator_create_nested().destroy() + **/ +static void destroy_nested(nested_enumerator_t *this) +{ + if (this->destroy_data) + { + this->destroy_data(this->data); + } + DESTROY_IF(this->inner); + this->outer->destroy(this->outer); + free(this); +} + +/** + * See header + */ +enumerator_t *enumerator_create_nested(enumerator_t *outer, + enumerator_t *(inner_constructor)(void *outer, void *data), + void *data, void (*destroy_data)(void *data)) +{ + nested_enumerator_t *enumerator = malloc_thing(nested_enumerator_t); + + enumerator->public.enumerate = (void*)enumerate_nested; + enumerator->public.destroy = (void*)destroy_nested; + enumerator->outer = outer; + enumerator->inner = NULL; + enumerator->create_inner = (void*)inner_constructor; + enumerator->data = data; + enumerator->destroy_data = destroy_data; + + return &enumerator->public; +} + +/** + * enumerator for filtered enumerator + */ +typedef struct { + enumerator_t public; + enumerator_t *unfiltered; + void *data; + bool (*filter)(void *data, ...); + void (*destructor)(void *data); +} filter_enumerator_t; + +/** + * Implementation of enumerator_create_filter().destroy + */ +void destroy_filter(filter_enumerator_t *this) +{ + if (this->destructor) + { + this->destructor(this->data); + } + this->unfiltered->destroy(this->unfiltered); + free(this); +} + +/** + * Implementation of enumerator_create_filter().enumerate + */ +bool enumerate_filter(filter_enumerator_t *this, void *o1, void *o2, + void *o3, void *o4, void *o5) +{ + void *i1, *i2, *i3, *i4, *i5; + + while (this->unfiltered->enumerate(this->unfiltered, &i1, &i2, &i3, &i4, &i5)) + { + if (this->filter(this->data, &i1, o1, &i2, o2, &i3, o3, &i4, o4, &i5, o5)) + { + return TRUE; + } + } + return FALSE; +} + +/** + * see header + */ +enumerator_t *enumerator_create_filter(enumerator_t *unfiltered, + bool (*filter)(void *data, ...), + void *data, void (*destructor)(void *data)) +{ + filter_enumerator_t *this = malloc_thing(filter_enumerator_t); + + this->public.enumerate = (void*)enumerate_filter; + this->public.destroy = (void*)destroy_filter; + this->unfiltered = unfiltered; + this->filter = filter; + this->data = data; + this->destructor = destructor; + + return &this->public; +} + +/** + * enumerator for cleaner enumerator + */ +typedef struct { + enumerator_t public; + enumerator_t *wrapped; + void (*cleanup)(void *data); + void *data; +} cleaner_enumerator_t; + +/** + * Implementation of enumerator_create_cleanup().destroy + */ +static void destroy_cleaner(cleaner_enumerator_t *this) +{ + this->cleanup(this->data); + this->wrapped->destroy(this->wrapped); + free(this); +} + +/** + * Implementation of enumerator_create_cleaner().enumerate + */ +static bool enumerate_cleaner(cleaner_enumerator_t *this, void *v1, void *v2, + void *v3, void *v4, void *v5) +{ + return this->wrapped->enumerate(this->wrapped, v1, v2, v3, v4, v5); +} + +/** + * see header + */ +enumerator_t *enumerator_create_cleaner(enumerator_t *wrapped, + void (*cleanup)(void *data), void *data) +{ + cleaner_enumerator_t *this = malloc_thing(cleaner_enumerator_t); + + this->public.enumerate = (void*)enumerate_cleaner; + this->public.destroy = (void*)destroy_cleaner; + this->wrapped = wrapped; + this->cleanup = cleanup; + this->data = data; + + return &this->public; +} + +/** + * enumerator for single enumerator + */ +typedef struct { + enumerator_t public; + void *item; + void (*cleanup)(void *item); + bool done; +} single_enumerator_t; + +/** + * Implementation of enumerator_create_single().destroy + */ +static void destroy_single(single_enumerator_t *this) +{ + if (this->cleanup) + { + this->cleanup(this->item); + } + free(this); +} + +/** + * Implementation of enumerator_create_single().enumerate + */ +static bool enumerate_single(single_enumerator_t *this, void **item) +{ + if (this->done) + { + return FALSE; + } + *item = this->item; + this->done = TRUE; + return TRUE; +} + +/** + * see header + */ +enumerator_t *enumerator_create_single(void *item, void (*cleanup)(void *item)) +{ + single_enumerator_t *this = malloc_thing(single_enumerator_t); + + this->public.enumerate = (void*)enumerate_single; + this->public.destroy = (void*)destroy_single; + this->item = item; + this->cleanup = cleanup; + this->done = FALSE; + + return &this->public; +} + |