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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2023-09-16 13:29:10 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2023-09-19 11:45:53 +0200
commitaccd38b7034f6b9e292d4191afb39322fe943486 (patch)
treee2e6693452eddbd50342043e0f2a36ecffe16e93 /extras
parent73ad00f9a414a13d8970d27296f52e774ff6954e (diff)
Add pwd and path dependent prompt to browser example
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'extras')
-rw-r--r--extras/browse.c179
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);