diff options
| -rw-r--r-- | extras/browse.c | 179 |
1 files changed, 172 insertions, 7 deletions
diff --git a/extras/browse.c b/extras/browse.c index 22bdfb1..00e5dbe 100644 --- a/extras/browse.c +++ b/extras/browse.c @@ -30,6 +30,7 @@ static sqfs_super_t super; static sqfs_id_table_t *idtbl; static sqfs_data_reader_t *data; static sqfs_u64 working_dir; +static char *prompt; static int resolve_ref(const char *path, sqfs_u64 *out) { @@ -84,23 +85,165 @@ static int resolve_ref(const char *path, sqfs_u64 *out) return 0; } +static char *add_prefix(const char *pfx, size_t pfxlen, char *path) +{ + size_t len; + char *out; + + if (path == NULL) { + out = calloc(1, pfxlen + 1); + if (out == NULL) + goto fail; + memcpy(out, pfx, pfxlen); + } else { + len = strlen(path) + 1; + out = realloc(path, pfxlen + 1 + len); + if (out == NULL) + goto fail; + + memmove(out + pfxlen + 1, out, len); + memcpy(out, pfx, pfxlen); + out[pfxlen] = '/'; + } + + return out; +fail: + fputs("out-of-memory\n", stderr); + free(path); + return NULL; +} + +static char *full_path(void) +{ + sqfs_inode_generic_t *inode = NULL, *pnode = NULL; + sqfs_dir_node_t *ent = NULL; + char *path = NULL; + sqfs_u64 iref = working_dir; + int ret; + + if (iref == super.root_inode_ref) + return strdup("/"); + + ret = sqfs_dir_reader_get_inode(dr, iref, &inode); + if (ret) { + fprintf(stderr, "Loading inode: %d\n", ret); + return NULL; + } + + while (iref != super.root_inode_ref) { + sqfs_dir_reader_state_t state; + sqfs_u32 parent; + sqfs_u64 pref; + + if (inode->base.type == SQFS_INODE_DIR) { + parent = inode->data.dir.parent_inode; + } else if (inode->base.type == SQFS_INODE_EXT_DIR) { + parent = inode->data.dir_ext.parent_inode; + } else { + fputs("Inode not a directory??\n", stderr); + goto fail; + } + + ret = sqfs_dir_reader_resolve_inum(dr, parent, &pref); + if (ret) { + fputs("Parent inode not cached!\n", stderr); + goto fail; + } + + ret = sqfs_dir_reader_get_inode(dr, pref, &pnode); + if (ret) { + fprintf(stderr, "Error loading parent inode: %d\n", + ret); + goto fail; + } + + ret = sqfs_dir_reader_open_dir(dr, pnode, &state, 0); + if (ret) { + fprintf(stderr, "Error opening parent dir: %d\n", + ret); + goto fail; + } + + do { + sqfs_free(ent); + ret = sqfs_dir_reader_read(dr, &state, &ent); + } while (ret == 0 && state.ent_ref != iref); + + if (ret) { + fprintf(stderr, "Error finding entry in dir: %d\n", + ret); + goto fail; + } + + path = add_prefix((const char *)ent->name, ent->size + 1, path); + if (path == NULL) + goto fail; + + sqfs_free(ent); + sqfs_free(inode); + inode = pnode; + pnode = NULL; + ent = NULL; + iref = pref; + } + + path = add_prefix("", 0, path); + if (path == NULL) + goto fail; + + sqfs_free(inode); + return path; +fail: + sqfs_free(inode); + sqfs_free(pnode); + sqfs_free(ent); + free(path); + return NULL; +} + /*****************************************************************************/ static void change_directory(const char *dirname) { + char *path, *str; + const char *end; + size_t len; int ret; if (dirname == NULL) { working_dir = super.root_inode_ref; - return; + } else { + ret = resolve_ref(dirname, &working_dir); + if (ret < 0) { + fprintf(stderr, "%s: error resolving path: %d\n", + dirname, ret); + } else if (ret > 0) { + fprintf(stderr, "%s: no such file or directory\n", + dirname); + } } - ret = resolve_ref(dirname, &working_dir); - if (ret < 0) { - fprintf(stderr, "%s: error resolving path: %d\n", dirname, ret); - } else if (ret > 0) { - fprintf(stderr, "%s: no such file or directory\n", dirname); + path = full_path(); + if (path == NULL) + return; + + end = strrchr(path, '/'); + end = end == NULL ? path : (end + 1); + len = strlen(end); + + str = calloc(1, len + 3); + if (str == NULL) { + free(path); + return; } + + memcpy(str, end, len); + str[len] = '$'; + str[len + 1] = ' '; + + free(prompt); + free(path); + prompt = str; } /*****************************************************************************/ @@ -520,6 +663,20 @@ static void cat_cmd(const char *filename) /*****************************************************************************/ +static void pwd_cmd(const char *filename) +{ + (void)filename; + char *path; + + path = full_path(); + if (path != NULL) { + printf("%s\n", path); + free(path); + } +} + +/*****************************************************************************/ + static const struct { const char *cmd; void (*handler)(const char *arg); @@ -528,6 +685,7 @@ static const struct { { "cd", change_directory }, { "stat", stat_cmd }, { "cat", cat_cmd }, + { "pwd", pwd_cmd }, }; int main(int argc, char **argv) @@ -607,9 +765,15 @@ int main(int argc, char **argv) } /* main readline loop */ + prompt = strdup("$ "); + if (prompt == NULL) { + fputs("out-of-memory\n", stderr); + goto out; + } + for (;;) { free(buffer); - buffer = readline("$ "); + buffer = readline(prompt); if (buffer == NULL) goto out; @@ -647,6 +811,7 @@ int main(int argc, char **argv) status = EXIT_SUCCESS; free(buffer); out: + free(prompt); sqfs_drop(data); out_dir: sqfs_drop(dr); |