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#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <string.h>
#include <vadefs.h>
#include "smount.h"
#include "dirent.h"
#define isseparator(c) (c == '/' || c == '\\')
static smtPath* smtnewpath(int type, const char* path, smtPath* next)
{
smtPath* temp = (smtPath*)malloc(sizeof(smtPath));
int len = strlen(path);
temp->path = (char*)malloc(len + 1);
memcpy(temp->path, path, len);
temp->path[len] = '\0';
// trim trailing separator
while (isseparator(temp->path[--len]))
temp->path[len] = '\0';
temp->next = next;
temp->type = type;
return temp;
}
static const char* mkstr(const char* str)
{
int len = strlen(str);
char* temp = (char*)malloc(strlen(str));
memcpy(temp, str, len);
return temp;
}
/**
* Create a new shared contex.
*/
smtShared* smtnewshared()
{
smtShared* shared = (smtShared*)malloc(sizeof(smtShared));
shared->mount = 0;
return shared;
}
/**
* Concatenate strings together.
*/
char* concat(const char *str, ...) {
va_list args;
const char *s;
// Get len
int len = strlen(str);
va_start(args, str);
while ((s = va_arg(args, char*))) {
len += strlen(s);
}
va_end(args);
// Build string
char *res = (char*)malloc(len + 1);
if (!res) return NULL;
strcpy(res, str);
va_start(args, str);
while ((s = va_arg(args, char*))) {
strcat(res, s);
}
va_end(args);
return res;
}
static int isdir(const char* path) {
struct stat s;
int res = stat(path, &s);
return S_ISDIR(s.st_mode);
}
int smtmount(smtShared* S, const char *path)
{
if (!isdir(path))
return SMT_INVALIDMOUNT;
S->mount = smtnewpath(PATH_DIR, path, 0);
return SMT_SUCCESS;
}
void smtunmount(smtShared* S)
{
smtPath* mount = S->mount;
while (mount)
{
free(mount->path);
mount = mount->next;
}
}
int smtexists(smtShared* S, const char *path)
{
char* r = concat(S->mount->path, "/", path, 0);
if (!r) return SMT_NOSUCHDIR;
struct stat s;
int res = stat(r, &s);
free(r);
if (res == 0)
return SMT_SUCCESS;
return SMT_NOSUCHDIR;
}
static struct stat smtgetstat(smtShared* S, const char*path)
{
char* r = concat(S->mount->path, "/", path, 0);
struct stat s = {0};
if (!r) return s;
int res = stat(r, &s);
free(r);
return s;
}
int smtisdir(smtShared* S, const char *path)
{
struct stat s = smtgetstat(S, path);
return S_ISDIR(s.st_mode);
}
int smtisreg(smtShared* S, const char *path)
{
struct stat s = smtgetstat(S, path);
return S_ISREG(s.st_mode);
}
const char* smterrstr(int e)
{
switch (e)
{
case SMT_INVALIDMOUNT: return "invalid mount directory";
default: return "unknown error";
}
}
void *smtread(smtShared* S, const char *path, unsigned int *size)
{
if (size == NULL) return NULL;
if (!smtisreg(S, path)) return NULL;
char *r = concat(S->mount->path, "/", path, NULL);
if (!r)
return NULL;
FILE *fp = fopen(r, "rb");
free(r);
if (!fp)
return 0;
/* Get file size */
fseek(fp, 0, SEEK_END);
*size = ftell(fp);
/* Load file */
fseek(fp, 0, SEEK_SET);
char *res = (char*)malloc(*size + 1);
if (!res) return NULL;
res[*size] = '\0';
if (fread(res, 1, *size, fp) != *size)
{
free(res);
fclose(fp);
return NULL;
}
fclose(fp);
return res;
}
char* smtfullpath(smtShared* S, const char* path)
{
return concat(S->mount->path, "/", path, 0);
}
int smtsize(smtShared* S, const char *path)
{
struct stat s = smtgetstat(S, path);
return s.st_size;
}
void smtdelete(smtShared* S, const char *path)
{
char* name = smtfullpath(S, path);
remove(name);
free(name);
}
int smtwrite(smtShared* S, const char *path, const void *data, int size)
{
char* name = smtfullpath(S, path);
if (!name) return SMT_NOSUCHDIR;
FILE *fp = fopen(name, "wb");
free(name);
if (!fp) return SMT_UNABLEOPEN;
int res = fwrite(data, size, 1, fp);
fclose(fp);
return (res == 1) ? SMT_SUCCESS : SMT_CANTWRITE;
}
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