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mpv/playtree.c

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/// \file
/// \ingroup Playtree
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#ifdef MP_DEBUG
#include <assert.h>
#endif
#include "m_config.h"
#include "playtree.h"
#include "mp_msg.h"
static int
play_tree_is_valid(play_tree_t* pt);
play_tree_t*
play_tree_new(void) {
play_tree_t* r = calloc(1,sizeof(play_tree_t));
if(r == NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(int)sizeof(play_tree_t));
return NULL;
}
r->entry_type = PLAY_TREE_ENTRY_NODE;
return r;
}
void
play_tree_free(play_tree_t* pt, int children) {
play_tree_t* iter;
#ifdef MP_DEBUG
assert(pt != NULL);
#endif
if(children) {
for(iter = pt->child; iter != NULL; ) {
play_tree_t* nxt=iter->next;
play_tree_free(iter,1);
iter = nxt;
}
pt->child = NULL;
}
play_tree_remove(pt,0,0);
for(iter = pt->child ; iter != NULL ; iter = iter->next)
iter->parent = NULL;
//if(pt->params) free(pt->params);
if(pt->files) {
int i;
for(i = 0 ; pt->files[i] != NULL ; i++)
free(pt->files[i]);
free(pt->files);
}
free(pt);
}
void
play_tree_free_list(play_tree_t* pt, int children) {
play_tree_t* iter;
#ifdef MP_DEBUG
assert(pt != NULL);
#endif
for(iter = pt ; iter->prev != NULL ; iter = iter->prev)
/* NOTHING */;
while(iter) {
play_tree_t* nxt = iter->next;
play_tree_free(iter, children);
iter = nxt;
}
}
void
play_tree_append_entry(play_tree_t* pt, play_tree_t* entry) {
play_tree_t* iter;
#ifdef MP_DEBUG
assert(pt != NULL);
assert(entry != NULL);
#endif
if(pt == entry)
return;
for(iter = pt ; iter->next != NULL ; iter = iter->next)
/* NOTHING */;
entry->parent = iter->parent;
entry->prev = iter;
entry->next = NULL;
iter->next = entry;
}
void
play_tree_prepend_entry(play_tree_t* pt, play_tree_t* entry) {
play_tree_t* iter;
#ifdef MP_DEBUG
assert(pt != NULL);
assert(entry != NULL);
#endif
for(iter = pt ; iter->prev != NULL; iter = iter->prev)
/* NOTHING */;
entry->prev = NULL;
entry->next = iter;
entry->parent = iter->parent;
iter->prev = entry;
if(entry->parent) {
#ifdef MP_DEBUG
assert(entry->parent->child == iter);
#endif
entry->parent->child = entry;
}
}
void
play_tree_insert_entry(play_tree_t* pt, play_tree_t* entry) {
#ifdef MP_DEBUG
assert(pt != NULL);
assert(entry != NULL);
#endif
entry->parent = pt->parent;
entry->prev = pt;
if(pt->next) {
#ifdef MP_DEBUG
assert(pt->next->prev == pt);
#endif
entry->next = pt->next;
entry->next->prev = entry;
} else
entry->next = NULL;
pt->next = entry;
}
void
play_tree_remove(play_tree_t* pt, int free_it, int with_children) {
#ifdef MP_DEBUG
assert(pt != NULL);
#endif
// Middle of list
if(pt->prev && pt->next) {
#ifdef MP_DEBUG
assert(pt->prev->next == pt);
assert(pt->next->prev == pt);
#endif
pt->prev->next = pt->next;
pt->next->prev = pt->prev;
} // End of list
else if(pt->prev) {
#ifdef MP_DEBUG
assert(pt->prev->next == pt);
#endif
pt->prev->next = NULL;
} // Beginning of list
else if(pt->next) {
#ifdef MP_DEBUG
assert(pt->next->prev == pt);
#endif
pt->next->prev = NULL;
if(pt->parent) {
#ifdef MP_DEBUG
assert(pt->parent->child == pt);
#endif
pt->parent->child = pt->next;
}
} // The only one
else if(pt->parent) {
#ifdef MP_DEBUG
assert(pt->parent->child == pt);
#endif
pt->parent->child = NULL;
}
pt->prev = pt->next = pt->parent = NULL;
if(free_it)
play_tree_free(pt,with_children);
}
void
play_tree_set_child(play_tree_t* pt, play_tree_t* child) {
play_tree_t* iter;
#ifdef MP_DEBUG
assert(pt != NULL);
assert(pt->entry_type == PLAY_TREE_ENTRY_NODE);
#endif
//DEBUG_FF: Where are the children freed?
// Attention in using this function!
for(iter = pt->child ; iter != NULL ; iter = iter->next)
iter->parent = NULL;
// Go back to first one
for(iter = child ; iter->prev != NULL ; iter = iter->prev)
/* NOTHING */;
pt->child = iter;
for( ; iter != NULL ; iter= iter->next)
iter->parent = pt;
}
void
play_tree_set_parent(play_tree_t* pt, play_tree_t* parent) {
play_tree_t* iter;
#ifdef MP_DEBUG
assert(pt != NULL);
#endif
if(pt->parent)
pt->parent->child = NULL;
for(iter = pt ; iter != NULL ; iter = iter->next)
iter->parent = parent;
if(pt->prev) {
for(iter = pt->prev ; iter->prev != NULL ; iter = iter->prev)
iter->parent = parent;
iter->parent = parent;
parent->child = iter;
} else
parent->child = pt;
}
void
play_tree_add_file(play_tree_t* pt,char* file) {
int n = 0;
char* e;
#ifdef MP_DEBUG
assert(pt != NULL);
assert(pt->child == NULL);
assert(file != NULL);
#endif
if(pt->entry_type != PLAY_TREE_ENTRY_NODE &&
pt->entry_type != PLAY_TREE_ENTRY_FILE)
return;
if(pt->files) {
for(n = 0 ; pt->files[n] != NULL ; n++)
/* NOTHING */;
}
pt->files = (char**)realloc(pt->files,(n+2)*sizeof(char*));
if(pt->files ==NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(n+2)*(int)sizeof(char*));
return;
}
e = pt->files[n] = strdup(file);
pt->files[n+1] = NULL;
pt->entry_type = PLAY_TREE_ENTRY_FILE;
}
int
play_tree_remove_file(play_tree_t* pt,char* file) {
int n,f = -1;
#ifdef MP_DEBUG
assert(pt != NULL);
assert(file != NULL);
assert(pt->entry_type != PLAY_TREE_ENTRY_NODE);
#endif
for(n=0 ; pt->files[n] != NULL ; n++) {
if(strcmp(file,pt->files[n]) == 0)
f = n;
}
if(f < 0) // Not found
return 0;
#ifdef MP_DEBUG
assert(n > f);
#endif
free(pt->files[f]);
if(n > 1) {
memmove(&pt->files[f],&pt->files[f+1],(n-f)*sizeof(char*));
pt->files = (char**)realloc(pt->files,n*sizeof(char*));
if(pt->files == NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(n+2)*(int)sizeof(char*));
return -1;
}
} else {
free(pt->files);
pt->files = NULL;
}
return 1;
}
void
play_tree_set_param(play_tree_t* pt, char* name, char* val) {
int n = 0;
#ifdef MP_DEBUG
assert(pt != NULL);
assert(name != NULL);
#endif
if(pt->params)
for ( ; pt->params[n].name != NULL ; n++ ) { }
pt->params = (play_tree_param_t*)realloc(pt->params,(n+2)*sizeof(play_tree_param_t));
if(pt->params == NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't realloc params (%d bytes of memory)\n",(n+2)*(int)sizeof(play_tree_param_t));
return;
}
pt->params[n].name = strdup(name);
pt->params[n].value = val != NULL ? strdup(val) : NULL;
memset(&pt->params[n+1],0,sizeof(play_tree_param_t));
return;
}
int
play_tree_unset_param(play_tree_t* pt, char* name) {
int n,ni = -1;
#ifdef MP_DEBUG
assert(pt != NULL);
assert(name != NULL);
assert(pt->params != NULL);
#endif
for(n = 0 ; pt->params[n].name != NULL ; n++) {
if(strcasecmp(pt->params[n].name,name) == 0)
ni = n;
}
if(ni < 0)
return 0;
if(pt->params[ni].name) free(pt->params[ni].name);
if(pt->params[ni].value) free(pt->params[ni].value);
if(n > 1) {
memmove(&pt->params[ni],&pt->params[ni+1],(n-ni)*sizeof(play_tree_param_t));
pt->params = (play_tree_param_t*)realloc(pt->params,n*sizeof(play_tree_param_t));
if(pt->params == NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",n*(int)sizeof(play_tree_param_t));
return -1;
}
} else {
free(pt->params);
pt->params = NULL;
}
return 1;
}
void
play_tree_set_params_from(play_tree_t* dest,play_tree_t* src) {
int i;
#ifdef MP_DEBUG
assert(dest != NULL);
assert(src != NULL);
#endif
if(!src->params)
return;
for(i = 0; src->params[i].name != NULL ; i++)
play_tree_set_param(dest,src->params[i].name,src->params[i].value);
if(src->flags & PLAY_TREE_RND) // pass the random flag too
dest->flags |= PLAY_TREE_RND;
}
// all children if deep < 0
void
play_tree_set_flag(play_tree_t* pt, int flags , int deep) {
play_tree_t* i;
pt->flags |= flags;
if(deep && pt->child) {
if(deep > 0) deep--;
for(i = pt->child ; i ; i = i->next)
play_tree_set_flag(i,flags,deep);
}
}
void
play_tree_unset_flag(play_tree_t* pt, int flags , int deep) {
play_tree_t* i;
pt->flags &= ~flags;
if(deep && pt->child) {
if(deep > 0) deep--;
for(i = pt->child ; i ; i = i->next)
play_tree_unset_flag(i,flags,deep);
}
}
//////////////////////////////////// ITERATOR //////////////////////////////////////
static void
play_tree_iter_push_params(play_tree_iter_t* iter) {
int n;
play_tree_t* pt;
#ifdef MP_DEBUG
assert(iter != NULL);
assert(iter->config != NULL);
assert(iter->tree != NULL);
#endif
pt = iter->tree;
// We always push a config because we can set some option
// while playing
m_config_push(iter->config);
if(pt->params == NULL)
return;
for(n = 0; pt->params[n].name != NULL ; n++) {
int e;
if((e = m_config_set_option(iter->config,pt->params[n].name,pt->params[n].value)) < 0) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Error %d while setting option '%s' with value '%s'\n",e,
pt->params[n].name,pt->params[n].value);
}
}
if(!pt->child)
iter->entry_pushed = 1;
return;
}
play_tree_iter_t*
play_tree_iter_new(play_tree_t* pt,m_config_t* config) {
play_tree_iter_t* iter;
#ifdef MP_DEBUG
assert(pt != NULL);
assert(config != NULL);
#endif
if( ! play_tree_is_valid(pt))
return NULL;
iter = calloc(1,sizeof(play_tree_iter_t));
if(! iter) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate new iterator (%d bytes of memory)\n",(int)sizeof(play_tree_iter_t));
return NULL;
}
iter->root = pt;
iter->tree = NULL;
iter->config = config;
if(pt->parent)
iter->loop = pt->parent->loop;
return iter;
}
void
play_tree_iter_free(play_tree_iter_t* iter) {
#ifdef MP_DEBUG
assert(iter != NULL);
#endif
if(iter->status_stack) {
#ifdef MP_DEBUG
assert(iter->stack_size > 0);
#endif
free(iter->status_stack);
}
free(iter);
}
static play_tree_t*
play_tree_rnd_step(play_tree_t* pt) {
int count = 0;
int r;
play_tree_t *i,*head;
// Count how many free choice we have
for(i = pt ; i->prev ; i = i->prev)
if(!(i->flags & PLAY_TREE_RND_PLAYED)) count++;
head = i;
if(!(i->flags & PLAY_TREE_RND_PLAYED)) count++;
for(i = pt->next ; i ; i = i->next)
if(!(i->flags & PLAY_TREE_RND_PLAYED)) count++;
if(!count) return NULL;
r = (int)((float)(count) * rand() / (RAND_MAX + 1.0));
for(i = head ; i ; i=i->next) {
if(!(i->flags & PLAY_TREE_RND_PLAYED)) r--;
if(r < 0) return i;
}
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Random stepping error\n");
return NULL;
}
int
play_tree_iter_step(play_tree_iter_t* iter, int d,int with_nodes) {
play_tree_t* pt;
if ( !iter ) return PLAY_TREE_ITER_ENTRY;
if ( !iter->root ) return PLAY_TREE_ITER_ENTRY;
#ifdef MP_DEBUG
assert(iter != NULL);
assert(iter->root != NULL);
//printf("PT : Stepping = %d\n",d);
#endif
if(iter->tree == NULL) {
iter->tree = iter->root;
return play_tree_iter_step(iter,0,with_nodes);
}
if(iter->config && iter->entry_pushed > 0) {
iter->entry_pushed = 0;
m_config_pop(iter->config);
}
if(iter->tree->parent && (iter->tree->parent->flags & PLAY_TREE_RND))
iter->mode = PLAY_TREE_ITER_RND;
else
iter->mode = PLAY_TREE_ITER_NORMAL;
iter->file = -1;
if(iter->mode == PLAY_TREE_ITER_RND)
pt = play_tree_rnd_step(iter->tree);
else if( d > 0 ) {
int i;
pt = iter->tree;
for(i = d ; i > 0 && pt ; i--)
pt = pt->next;
d = i ? i : 1;
} else if(d < 0) {
int i;
pt = iter->tree;
for(i = d ; i < 0 && pt ; i++)
pt = pt->prev;
d = i ? i : -1;
} else
pt = iter->tree;
if(pt == NULL) { // No next
// Must we loop?
if (iter->mode == PLAY_TREE_ITER_RND) {
if (iter->root->loop == 0)
return PLAY_TREE_ITER_END;
play_tree_unset_flag(iter->root, PLAY_TREE_RND_PLAYED, -1);
if (iter->root->loop > 0) iter->root->loop--;
// try again
return play_tree_iter_step(iter, 0, with_nodes);
} else
if(iter->tree->parent && iter->tree->parent->loop != 0 && ((d > 0 && iter->loop != 0) || ( d < 0 && (iter->loop < 0 || iter->loop < iter->tree->parent->loop) ) ) ) {
if(d > 0) { // Go back to the first one
for(pt = iter->tree ; pt->prev != NULL; pt = pt->prev)
/* NOTHNG */;
if(iter->loop > 0) iter->loop--;
} else if( d < 0 ) { // Or the last one
for(pt = iter->tree ; pt->next != NULL; pt = pt->next)
/* NOTHNG */;
if(iter->loop >= 0 && iter->loop < iter->tree->parent->loop) iter->loop++;
}
iter->tree = pt;
return play_tree_iter_step(iter,0,with_nodes);
}
// Go up one level
return play_tree_iter_up_step(iter,d,with_nodes);
}
// Is there any valid child?
if(pt->child && play_tree_is_valid(pt->child)) {
iter->tree = pt;
if(with_nodes) { // Stop on the node
return PLAY_TREE_ITER_NODE;
} else // Or follow it
return play_tree_iter_down_step(iter,d,with_nodes);
}
// Is it a valid entry?
if(! play_tree_is_valid(pt)) {
if(d == 0) { // Can this happen ? FF: Yes!
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"What to do now ???? Infinite loop if we continue\n");
return PLAY_TREE_ITER_ERROR;
} // Not a valid entry : go to next one
return play_tree_iter_step(iter,d,with_nodes);
}
#ifdef MP_DEBUG
assert(pt->files != NULL);
#endif
iter->tree = pt;
for(d = 0 ; iter->tree->files[d] != NULL ; d++)
/* NOTHING */;
iter->num_files = d;
if(iter->config) {
play_tree_iter_push_params(iter);
iter->entry_pushed = 1;
if(iter->mode == PLAY_TREE_ITER_RND)
pt->flags |= PLAY_TREE_RND_PLAYED;
}
return PLAY_TREE_ITER_ENTRY;
}
static int
play_tree_is_valid(play_tree_t* pt) {
play_tree_t* iter;
#ifdef MP_DEBUG
assert(pt != NULL);
#endif
if(pt->entry_type != PLAY_TREE_ENTRY_NODE) {
#ifdef MP_DEBUG
assert(pt->child == NULL);
#endif
return 1;
}
else if (pt->child != NULL) {
for(iter = pt->child ; iter != NULL ; iter = iter->next) {
if(play_tree_is_valid(iter))
return 1;
}
}
return 0;
}
int
play_tree_iter_up_step(play_tree_iter_t* iter, int d,int with_nodes) {
#ifdef MP_DEBUG
assert(iter != NULL);
assert(iter->tree != NULL);
//printf("PT : Go UP\n");
#endif
iter->file = -1;
if(iter->tree->parent == iter->root->parent)
return PLAY_TREE_ITER_END;
#ifdef MP_DEBUG
assert(iter->tree->parent != NULL);
assert(iter->stack_size > 0);
assert(iter->status_stack != NULL);
#endif
iter->stack_size--;
iter->loop = iter->status_stack[iter->stack_size];
if(iter->stack_size > 0)
iter->status_stack = (int*)realloc(iter->status_stack,iter->stack_size*sizeof(int));
else {
free(iter->status_stack);
iter->status_stack = NULL;
}
if(iter->stack_size > 0 && iter->status_stack == NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",iter->stack_size*(int)sizeof(char*));
return PLAY_TREE_ITER_ERROR;
}
iter->tree = iter->tree->parent;
// Pop subtree params
if(iter->config) {
m_config_pop(iter->config);
if(iter->mode == PLAY_TREE_ITER_RND)
iter->tree->flags |= PLAY_TREE_RND_PLAYED;
}
return play_tree_iter_step(iter,d,with_nodes);
}
int
play_tree_iter_down_step(play_tree_iter_t* iter, int d,int with_nodes) {
#ifdef MP_DEBUG
assert(iter->tree->files == NULL);
assert(iter->tree->child != NULL);
assert(iter->tree->child->parent == iter->tree);
//printf("PT : Go DOWN\n");
#endif
iter->file = -1;
// Push subtree params
if(iter->config)
play_tree_iter_push_params(iter);
iter->stack_size++;
iter->status_stack = (int*)realloc(iter->status_stack,iter->stack_size*sizeof(int));
if(iter->status_stack == NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",iter->stack_size*(int)sizeof(int));
return PLAY_TREE_ITER_ERROR;
}
iter->status_stack[iter->stack_size-1] = iter->loop;
// Set new status
iter->loop = iter->tree->loop-1;
if(d >= 0)
iter->tree = iter->tree->child;
else {
play_tree_t* pt;
for(pt = iter->tree->child ; pt->next != NULL ; pt = pt->next)
/*NOTING*/;
iter->tree = pt;
}
return play_tree_iter_step(iter,0,with_nodes);
}
char*
play_tree_iter_get_file(play_tree_iter_t* iter, int d) {
#ifdef MP_DEBUG
assert(iter != NULL);
assert(iter->tree->child == NULL);
#endif
if(iter->tree->files == NULL)
return NULL;
#ifdef MP_DEBUG
assert(iter->num_files > 0);
#endif
if(iter->file >= iter->num_files-1 || iter->file < -1)
return NULL;
if(d > 0) {
if(iter->file >= iter->num_files - 1)
iter->file = 0;
else
iter->file++;
} else if(d < 0) {
if(iter->file <= 0)
iter->file = iter->num_files - 1;
else
iter->file--;
}
return iter->tree->files[iter->file];
}
play_tree_t*
play_tree_cleanup(play_tree_t* pt) {
play_tree_t* iter, *tmp, *first;
#ifdef MP_DEBUG
assert(pt != NULL);
#endif
if( ! play_tree_is_valid(pt)) {
play_tree_remove(pt,1,1);
return NULL;
}
first = pt->child;
for(iter = pt->child ; iter != NULL ; ) {
tmp = iter;
iter = iter->next;
if(! play_tree_is_valid(tmp)) {
play_tree_remove(tmp,1,1);
if(tmp == first) first = iter;
}
}
for(iter = first ; iter != NULL ; ) {
tmp = iter;
iter = iter->next;
play_tree_cleanup(tmp);
}
return pt;
}
play_tree_iter_t*
play_tree_iter_new_copy(play_tree_iter_t* old) {
play_tree_iter_t* iter;
#ifdef MP_DEBUG
assert(old != NULL);
#endif
iter = malloc(sizeof(play_tree_iter_t));
if(iter == NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(int)sizeof(play_tree_iter_t));
return NULL;
}
;
memcpy(iter,old,sizeof(play_tree_iter_t));
if(old->status_stack) {
iter->status_stack = malloc(old->stack_size * sizeof(int));
if(iter->status_stack == NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",old->stack_size * (int)sizeof(int));
free(iter);
return NULL;
}
memcpy(iter->status_stack,old->status_stack,iter->stack_size*sizeof(int));
}
iter->config = NULL;
return iter;
}
// HIGH Level API, by Fabian Franz (mplayer@fabian-franz.de)
//
play_tree_iter_t* pt_iter_create(play_tree_t** ppt, m_config_t* config)
{
play_tree_iter_t* r=NULL;
#ifdef MP_DEBUG
assert(*ppt!=NULL);
#endif
*ppt=play_tree_cleanup(*ppt);
if(*ppt) {
r = play_tree_iter_new(*ppt,config);
if (r && play_tree_iter_step(r,0,0) != PLAY_TREE_ITER_ENTRY)
{
play_tree_iter_free(r);
r = NULL;
}
}
return r;
}
void pt_iter_destroy(play_tree_iter_t** iter)
{
if (iter && *iter)
{
free(*iter);
iter=NULL;
}
}
char* pt_iter_get_file(play_tree_iter_t* iter, int d)
{
int i=0;
char* r;
if (iter==NULL)
return NULL;
r = play_tree_iter_get_file(iter,d);
while (!r && d!=0)
{
if (play_tree_iter_step(iter,d,0) != PLAY_TREE_ITER_ENTRY)
break;
r=play_tree_iter_get_file(iter,d);
i++;
}
return r;
}
void pt_iter_insert_entry(play_tree_iter_t* iter, play_tree_t* entry)
{
play_tree_t *pt = iter->tree;
#ifdef MP_DEBUG
assert(pt!=NULL);
assert(entry!=NULL);
assert(entry!=pt);
#endif
play_tree_insert_entry(pt, entry);
play_tree_set_params_from(entry,pt);
}
void pt_iter_replace_entry(play_tree_iter_t* iter, play_tree_t* entry)
{
play_tree_t *pt = iter->tree;
pt_iter_insert_entry(iter, entry);
play_tree_remove(pt, 1, 1);
iter->tree=entry;
}
//Add a new file as a new entry
void pt_add_file(play_tree_t** ppt, char* filename)
{
play_tree_t *pt = *ppt, *entry = play_tree_new();
#ifdef MP_DEBUG
assert(entry!=NULL);
#endif
play_tree_add_file(entry, filename);
if (pt)
play_tree_append_entry(pt, entry);
else
{
pt=entry;
*ppt=pt;
}
play_tree_set_params_from(entry,pt);
}
void pt_add_gui_file(play_tree_t** ppt, char* path, char* file)
{
char* wholename = malloc(strlen(path)+strlen(file)+2);
if (wholename)
{
strcpy(wholename, path);
strcat(wholename, "/");
strcat(wholename, file);
pt_add_file(ppt, wholename);
free(wholename); // As pt_add_file strdups it anyway!
}
}
void pt_iter_goto_head(play_tree_iter_t* iter)
{
iter->tree=iter->root;
play_tree_iter_step(iter, 0, 0);
}
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