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author | David Oberhollenzer <david.oberhollenzer@sigma-star.at> | 2023-05-13 17:18:43 +0200 |
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committer | David Oberhollenzer <david.oberhollenzer@sigma-star.at> | 2023-05-13 17:18:43 +0200 |
commit | e501c9a4bc230dab034571c2078a12a8a856c67a (patch) | |
tree | 028c149597a194ec2220a60dc12db90a62c64669 /lib/io/src/dir_tree_iterator.c | |
parent | 7ce4b36d517ac5fade36240d293ff784ef6a9305 (diff) |
Move directory iterator from libutil to libio
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/io/src/dir_tree_iterator.c')
-rw-r--r-- | lib/io/src/dir_tree_iterator.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/lib/io/src/dir_tree_iterator.c b/lib/io/src/dir_tree_iterator.c new file mode 100644 index 0000000..b05eeb3 --- /dev/null +++ b/lib/io/src/dir_tree_iterator.c @@ -0,0 +1,310 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * dir_tree_iterator.c + * + * Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at> + */ +#include "config.h" +#include "io/dir_tree_iterator.h" +#include "util/util.h" +#include "sqfs/error.h" + +#include <stdlib.h> +#include <string.h> + +typedef struct dir_stack_t { + struct dir_stack_t *next; + dir_iterator_t *dir; + char name[]; +} dir_stack_t; + +typedef struct { + dir_iterator_t base; + + dir_tree_cfg_t cfg; + int state; + dir_stack_t *top; +} dir_tree_iterator_t; + +static void pop(dir_tree_iterator_t *it) +{ + if (it->top != NULL) { + dir_stack_t *ent = it->top; + it->top = it->top->next; + + sqfs_drop(ent->dir); + free(ent); + } +} + +static int push(dir_tree_iterator_t *it, const char *name, dir_iterator_t *dir) +{ + dir_stack_t *ent = alloc_flex(sizeof(*ent), 1, strlen(name) + 1); + + if (ent == NULL) + return SQFS_ERROR_ALLOC; + + strcpy(ent->name, name); + ent->dir = sqfs_grab(dir); + ent->next = it->top; + it->top = ent; + return 0; +} + +static bool should_skip(const dir_tree_iterator_t *dir, const dir_entry_t *ent) +{ + unsigned int type_mask; + + if (!strcmp(ent->name, ".") || !strcmp(ent->name, "..")) + return true; + + if ((dir->cfg.flags & DIR_SCAN_ONE_FILESYSTEM)) { + if (ent->dev != ((const dir_iterator_t *)dir)->dev) + return true; + } + + switch (ent->mode & S_IFMT) { + case S_IFSOCK: type_mask = DIR_SCAN_NO_SOCK; break; + case S_IFLNK: type_mask = DIR_SCAN_NO_SLINK; break; + case S_IFREG: type_mask = DIR_SCAN_NO_FILE; break; + case S_IFBLK: type_mask = DIR_SCAN_NO_BLK; break; + case S_IFCHR: type_mask = DIR_SCAN_NO_CHR; break; + case S_IFIFO: type_mask = DIR_SCAN_NO_FIFO; break; + default: type_mask = 0; break; + } + + return (dir->cfg.flags & type_mask) != 0; +} + +static dir_entry_t *expand_path(const dir_tree_iterator_t *it, dir_entry_t *ent) +{ + size_t slen = strlen(ent->name) + 1, plen = 0; + dir_stack_t *sit; + char *dst; + + for (sit = it->top; sit != NULL; sit = sit->next) { + if (sit->name[0] != '\0') + plen += strlen(sit->name) + 1; + } + + if (it->cfg.prefix != NULL && it->cfg.prefix[0] != '\0') + plen += strlen(it->cfg.prefix) + 1; + + if (plen > 0) { + void *new = realloc(ent, sizeof(*ent) + plen + slen); + if (new == NULL) { + free(ent); + return NULL; + } + + ent = new; + memmove(ent->name + plen, ent->name, slen); + dst = ent->name + plen; + + for (sit = it->top; sit != NULL; sit = sit->next) { + size_t len = strlen(sit->name); + if (len > 0) { + *(--dst) = '/'; + dst -= len; + memcpy(dst, sit->name, len); + } + } + + if (it->cfg.prefix != NULL && it->cfg.prefix[0] != '\0') { + size_t len = strlen(it->cfg.prefix); + memcpy(ent->name, it->cfg.prefix, len); + ent->name[len] = '/'; + } + } + + return ent; +} + +static void apply_changes(const dir_tree_iterator_t *it, dir_entry_t *ent) +{ + if (!(it->cfg.flags & DIR_SCAN_KEEP_TIME)) + ent->mtime = it->cfg.def_mtime; + + if (!(it->cfg.flags & DIR_SCAN_KEEP_UID)) + ent->uid = it->cfg.def_uid; + + if (!(it->cfg.flags & DIR_SCAN_KEEP_GID)) + ent->gid = it->cfg.def_gid; + + if (!(it->cfg.flags & DIR_SCAN_KEEP_MODE)) { + ent->mode &= ~(07777); + ent->mode |= it->cfg.def_mode & 07777; + } +} + +/*****************************************************************************/ + +static void destroy(sqfs_object_t *obj) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)obj; + + while (it->top != NULL) + pop(it); + + free(it); +} + +static int next(dir_iterator_t *base, dir_entry_t **out) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + dir_iterator_t *sub; + dir_entry_t *ent; + int ret; +retry: + *out = NULL; + sub = NULL; + ent = NULL; + + if (it->state != 0) + return it->state; + + for (;;) { + if (it->top == NULL) { + ret = 1; + goto fail; + } + + ret = it->top->dir->next(it->top->dir, &ent); + if (ret < 0) + goto fail; + + if (ret > 0) { + pop(it); + continue; + } + + if (should_skip(it, ent)) { + free(ent); + ent = NULL; + continue; + } + + break; + } + + ent = expand_path(it, ent); + if (ent == NULL) { + it->state = SQFS_ERROR_ALLOC; + return it->state; + } + + apply_changes(it, ent); + + if (S_ISDIR(ent->mode)) { + if (!(it->cfg.flags & DIR_SCAN_NO_RECURSION)) { + const char *name = strrchr(ent->name, '/'); + name = (name == NULL) ? ent->name : (name + 1); + + ret = it->top->dir->open_subdir(it->top->dir, &sub); + if (ret != 0) + goto fail; + + ret = push(it, name, sub); + sqfs_drop(sub); + if (ret != 0) + goto fail; + } + + if (it->cfg.flags & DIR_SCAN_NO_DIR) { + free(ent); + goto retry; + } + } + + if (it->cfg.name_pattern != NULL) { + if (it->cfg.flags & DIR_SCAN_MATCH_FULL_PATH) { + ret = fnmatch(it->cfg.name_pattern, + ent->name, FNM_PATHNAME); + } else { + const char *name = strrchr(ent->name, '/'); + name = (name == NULL) ? ent->name : (name + 1); + + ret = fnmatch(it->cfg.name_pattern, name, 0); + } + + if (ret != 0) { + free(ent); + goto retry; + } + } + + *out = ent; + return it->state; +fail: + free(ent); + it->state = ret; + return it->state; +} + +static int read_link(dir_iterator_t *base, char **out) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + + if (it->top == NULL) { + *out = NULL; + return SQFS_ERROR_NO_ENTRY; + } + + return it->top->dir->read_link(it->top->dir, out); +} + +static int open_subdir(dir_iterator_t *base, dir_iterator_t **out) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + + if (it->top == NULL) { + *out = NULL; + return SQFS_ERROR_NO_ENTRY; + } + + return it->top->dir->open_subdir(it->top->dir, out); +} + +dir_iterator_t *dir_tree_iterator_create(const char *path, + const dir_tree_cfg_t *cfg) +{ + dir_tree_iterator_t *it = calloc(1, sizeof(*it)); + dir_iterator_t *dir; + int ret; + + if (it == NULL) { + perror(path); + return NULL; + } + + it->cfg = *cfg; + + dir = dir_iterator_create(path); + if (dir == NULL) + goto fail; + + ret = push(it, "", dir); + dir = sqfs_drop(dir); + if (ret != 0) { + fprintf(stderr, "%s: out of memory\n", path); + goto fail; + } + + sqfs_object_init(it, destroy, NULL); + ((dir_iterator_t *)it)->dev = it->top->dir->dev; + ((dir_iterator_t *)it)->next = next; + ((dir_iterator_t *)it)->read_link = read_link; + ((dir_iterator_t *)it)->open_subdir = open_subdir; + + return (dir_iterator_t *)it; +fail: + free(it); + return NULL; +} + +void dir_tree_iterator_skip(dir_iterator_t *base) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + + pop(it); +} |