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settings.cpp
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settings.cpp
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#define _GNU_SOURCE 1
#include "pxt.h"
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#define FAIL(msg) \
do { \
DMESG("FAILURE: %s", msg); \
abort(); \
} while (0)
namespace settings {
#define ADD(c) \
do { \
buf[dp] = (c); \
dp++; \
if (dp > 1000) \
FAIL("too long"); \
} while (0)
const char *hexD = "0123456789abcdef";
static char *encodeString(const char *str) {
static char buf[1024];
int dp = 0;
for (auto sp = str; *sp; ++sp) {
auto c = *sp;
if (('0' <= c && c <= '9') || ('a' <= c && c <= 'z'))
ADD(c);
else if (('A' <= c && c <= 'Z')) {
ADD('-');
ADD(c | 0x20);
} else {
ADD('_');
ADD(hexD[(c >> 4) & 0xf]);
ADD(hexD[c & 0xf]);
}
}
ADD(0);
return buf;
}
static int hex(char c) {
if ('0' <= c && c <= '9')
return c - '0';
c |= 0x20;
if ('a' <= c && c <= 'f')
return c - 'a' + 10;
return -1;
}
static char *decodeString(const char *str) {
static char buf[1024];
int dp = 0;
if (strlen(str) > 1000)
FAIL("too long decode");
for (auto sp = str; *sp; ++sp) {
auto c = *sp;
if (('0' <= c && c <= '9') || ('a' <= c && c <= 'z'))
ADD(c);
else if (c == '-' && sp[1]) {
ADD(sp[1] & ~0x20);
sp++;
} else if (c == '_' && hex(sp[1]) >= 0 && hex(sp[2]) >= 0) {
ADD((hex(sp[1]) << 4) | hex(sp[2]));
sp += 2;
}
}
ADD(0);
return buf;
}
static const char *settingsDirectory() {
static char *name;
if (name)
return name;
#ifdef SETTINGSDIR
asprintf(&name, "%s/%s", SETTINGSDIR, encodeString(programName()->getUTF8Data()));
#else
asprintf(&name, "%s.data", initialArgv[0]);
#endif
#ifdef __WIN32__
mkdir(name);
#else
mkdir(name, 0777);
#endif
return name;
}
static const char *keyName(const char *key) {
static char *lastName;
if (lastName)
free(lastName);
auto dirname = settingsDirectory();
asprintf(&lastName, "%s/%s", dirname, encodeString(key));
return lastName;
}
static const char *keyName(String key) {
return keyName(key->getUTF8Data());
}
static FILE *openKey(String key, const char *mode) {
return fopen(keyName(key), mode);
}
//%
int _set(String key, Buffer data) {
// DMESG("set[%s] - %p", key->getUTF8Data(), data);
auto f = openKey(key, "wb");
if (!f) {
DMESG("errno=%d", errno);
FAIL("can't write file");
}
fwrite(data->data, data->length, 1, f);
fclose(f);
return 0;
}
//%
int _remove(String key) {
return remove(keyName(key));
}
//%
bool _exists(String key) {
auto f = openKey(key, "rb");
fclose(f);
return f != NULL;
}
//%
Buffer _get(String key) {
auto f = openKey(key, "rb");
if (f == NULL)
return NULL;
fseek(f, 0, SEEK_END);
auto sz = ftell(f);
auto ret = mkBuffer(NULL, sz);
registerGCObj(ret);
fseek(f, 0, SEEK_SET);
fread(ret->data, ret->length, 1, f);
fclose(f);
unregisterGCObj(ret);
return ret;
}
//%
void _userClean() {
auto dp = opendir(settingsDirectory());
if (!dp)
return;
for (;;) {
dirent *ep = readdir(dp);
if (!ep)
break;
auto name = decodeString(ep->d_name);
if (name[0] == '#')
continue;
remove(keyName(name));
}
closedir(dp);
}
//%
RefCollection *_list(String prefix) {
auto res = Array_::mk();
registerGCObj(res);
auto prefData = prefix->getUTF8Data();
auto prefLen = prefix->getUTF8Size();
auto wantsInternal = prefData[0] == '#';
auto dp = opendir(settingsDirectory());
for (;;) {
dirent *ep = dp ? readdir(dp) : NULL;
if (!ep)
break;
auto name = decodeString(ep->d_name);
if (!wantsInternal && name[0] == '#')
continue;
if (memcmp(name, prefData, prefLen) != 0)
continue;
auto str = mkString(name, -1);
registerGCObj(str);
res->head.push((TValue)str);
unregisterGCObj(str);
}
if (dp)
closedir(dp);
unregisterGCObj(res);
return res;
}
} // namespace settings