/* | |
** $Id: loslib.c,v 1.40.1.1 2013/04/12 18:48:47 roberto Exp $ | |
** Standard Operating System library | |
** See Copyright Notice in lua.h | |
*/ | |
#include <errno.h> | |
#include <locale.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <time.h> | |
#define loslib_c | |
#define LUA_LIB | |
#include "lua.h" | |
#include "lauxlib.h" | |
#include "lualib.h" | |
/* | |
** list of valid conversion specifiers for the 'strftime' function | |
*/ | |
#if !defined(LUA_STRFTIMEOPTIONS) | |
#if !defined(LUA_USE_POSIX) | |
#define LUA_STRFTIMEOPTIONS { "aAbBcdHIjmMpSUwWxXyYz%", "" } | |
#else | |
#define LUA_STRFTIMEOPTIONS \ | |
{ "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "" \ | |
"", "E", "cCxXyY", \ | |
"O", "deHImMSuUVwWy" } | |
#endif | |
#endif | |
/* | |
** By default, Lua uses tmpnam except when POSIX is available, where it | |
** uses mkstemp. | |
*/ | |
#if defined(LUA_USE_MKSTEMP) | |
#include <unistd.h> | |
#define LUA_TMPNAMBUFSIZE 32 | |
#define lua_tmpnam(b,e) { \ | |
strcpy(b, "/tmp/lua_XXXXXX"); \ | |
e = mkstemp(b); \ | |
if (e != -1) close(e); \ | |
e = (e == -1); } | |
#elif !defined(lua_tmpnam) | |
#define LUA_TMPNAMBUFSIZE L_tmpnam | |
#define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); } | |
#endif | |
/* | |
** By default, Lua uses gmtime/localtime, except when POSIX is available, | |
** where it uses gmtime_r/localtime_r | |
*/ | |
#if defined(LUA_USE_GMTIME_R) | |
#define l_gmtime(t,r) gmtime_r(t,r) | |
#define l_localtime(t,r) localtime_r(t,r) | |
#elif !defined(l_gmtime) | |
#define l_gmtime(t,r) ((void)r, gmtime(t)) | |
#define l_localtime(t,r) ((void)r, localtime(t)) | |
#endif | |
static int os_execute (lua_State *L) { | |
const char *cmd = luaL_optstring(L, 1, NULL); | |
int stat = system(cmd); | |
if (cmd != NULL) | |
return luaL_execresult(L, stat); | |
else { | |
lua_pushboolean(L, stat); /* true if there is a shell */ | |
return 1; | |
} | |
} | |
static int os_remove (lua_State *L) { | |
const char *filename = luaL_checkstring(L, 1); | |
return luaL_fileresult(L, remove(filename) == 0, filename); | |
} | |
static int os_rename (lua_State *L) { | |
const char *fromname = luaL_checkstring(L, 1); | |
const char *toname = luaL_checkstring(L, 2); | |
return luaL_fileresult(L, rename(fromname, toname) == 0, NULL); | |
} | |
static int os_tmpname (lua_State *L) { | |
char buff[LUA_TMPNAMBUFSIZE]; | |
int err; | |
lua_tmpnam(buff, err); | |
if (err) | |
return luaL_error(L, "unable to generate a unique filename"); | |
lua_pushstring(L, buff); | |
return 1; | |
} | |
static int os_getenv (lua_State *L) { | |
lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */ | |
return 1; | |
} | |
static int os_clock (lua_State *L) { | |
lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC); | |
return 1; | |
} | |
/* | |
** {====================================================== | |
** Time/Date operations | |
** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S, | |
** wday=%w+1, yday=%j, isdst=? } | |
** ======================================================= | |
*/ | |
static void setfield (lua_State *L, const char *key, int value) { | |
lua_pushinteger(L, value); | |
lua_setfield(L, -2, key); | |
} | |
static void setboolfield (lua_State *L, const char *key, int value) { | |
if (value < 0) /* undefined? */ | |
return; /* does not set field */ | |
lua_pushboolean(L, value); | |
lua_setfield(L, -2, key); | |
} | |
static int getboolfield (lua_State *L, const char *key) { | |
int res; | |
lua_getfield(L, -1, key); | |
res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1); | |
lua_pop(L, 1); | |
return res; | |
} | |
static int getfield (lua_State *L, const char *key, int d) { | |
int res, isnum; | |
lua_getfield(L, -1, key); | |
res = (int)lua_tointegerx(L, -1, &isnum); | |
if (!isnum) { | |
if (d < 0) | |
return luaL_error(L, "field " LUA_QS " missing in date table", key); | |
res = d; | |
} | |
lua_pop(L, 1); | |
return res; | |
} | |
static const char *checkoption (lua_State *L, const char *conv, char *buff) { | |
static const char *const options[] = LUA_STRFTIMEOPTIONS; | |
unsigned int i; | |
for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) { | |
if (*conv != '\0' && strchr(options[i], *conv) != NULL) { | |
buff[1] = *conv; | |
if (*options[i + 1] == '\0') { /* one-char conversion specifier? */ | |
buff[2] = '\0'; /* end buffer */ | |
return conv + 1; | |
} | |
else if (*(conv + 1) != '\0' && | |
strchr(options[i + 1], *(conv + 1)) != NULL) { | |
buff[2] = *(conv + 1); /* valid two-char conversion specifier */ | |
buff[3] = '\0'; /* end buffer */ | |
return conv + 2; | |
} | |
} | |
} | |
luaL_argerror(L, 1, | |
lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv)); | |
return conv; /* to avoid warnings */ | |
} | |
static int os_date (lua_State *L) { | |
const char *s = luaL_optstring(L, 1, "%c"); | |
time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL)); | |
struct tm tmr, *stm; | |
if (*s == '!') { /* UTC? */ | |
stm = l_gmtime(&t, &tmr); | |
s++; /* skip `!' */ | |
} | |
else | |
stm = l_localtime(&t, &tmr); | |
if (stm == NULL) /* invalid date? */ | |
lua_pushnil(L); | |
else if (strcmp(s, "*t") == 0) { | |
lua_createtable(L, 0, 9); /* 9 = number of fields */ | |
setfield(L, "sec", stm->tm_sec); | |
setfield(L, "min", stm->tm_min); | |
setfield(L, "hour", stm->tm_hour); | |
setfield(L, "day", stm->tm_mday); | |
setfield(L, "month", stm->tm_mon+1); | |
setfield(L, "year", stm->tm_year+1900); | |
setfield(L, "wday", stm->tm_wday+1); | |
setfield(L, "yday", stm->tm_yday+1); | |
setboolfield(L, "isdst", stm->tm_isdst); | |
} | |
else { | |
char cc[4]; | |
luaL_Buffer b; | |
cc[0] = '%'; | |
luaL_buffinit(L, &b); | |
while (*s) { | |
if (*s != '%') /* no conversion specifier? */ | |
luaL_addchar(&b, *s++); | |
else { | |
size_t reslen; | |
char buff[200]; /* should be big enough for any conversion result */ | |
s = checkoption(L, s + 1, cc); | |
reslen = strftime(buff, sizeof(buff), cc, stm); | |
luaL_addlstring(&b, buff, reslen); | |
} | |
} | |
luaL_pushresult(&b); | |
} | |
return 1; | |
} | |
static int os_time (lua_State *L) { | |
time_t t; | |
if (lua_isnoneornil(L, 1)) /* called without args? */ | |
t = time(NULL); /* get current time */ | |
else { | |
struct tm ts; | |
luaL_checktype(L, 1, LUA_TTABLE); | |
lua_settop(L, 1); /* make sure table is at the top */ | |
ts.tm_sec = getfield(L, "sec", 0); | |
ts.tm_min = getfield(L, "min", 0); | |
ts.tm_hour = getfield(L, "hour", 12); | |
ts.tm_mday = getfield(L, "day", -1); | |
ts.tm_mon = getfield(L, "month", -1) - 1; | |
ts.tm_year = getfield(L, "year", -1) - 1900; | |
ts.tm_isdst = getboolfield(L, "isdst"); | |
t = mktime(&ts); | |
} | |
if (t == (time_t)(-1)) | |
lua_pushnil(L); | |
else | |
lua_pushnumber(L, (lua_Number)t); | |
return 1; | |
} | |
static int os_difftime (lua_State *L) { | |
lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)), | |
(time_t)(luaL_optnumber(L, 2, 0)))); | |
return 1; | |
} | |
/* }====================================================== */ | |
static int os_setlocale (lua_State *L) { | |
static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, | |
LC_NUMERIC, LC_TIME}; | |
static const char *const catnames[] = {"all", "collate", "ctype", "monetary", | |
"numeric", "time", NULL}; | |
const char *l = luaL_optstring(L, 1, NULL); | |
int op = luaL_checkoption(L, 2, "all", catnames); | |
lua_pushstring(L, setlocale(cat[op], l)); | |
return 1; | |
} | |
static int os_exit (lua_State *L) { | |
int status; | |
if (lua_isboolean(L, 1)) | |
status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE); | |
else | |
status = luaL_optint(L, 1, EXIT_SUCCESS); | |
if (lua_toboolean(L, 2)) | |
lua_close(L); | |
if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */ | |
return 0; | |
} | |
static const luaL_Reg syslib[] = { | |
{"clock", os_clock}, | |
{"date", os_date}, | |
{"difftime", os_difftime}, | |
{"execute", os_execute}, | |
{"exit", os_exit}, | |
{"getenv", os_getenv}, | |
{"remove", os_remove}, | |
{"rename", os_rename}, | |
{"setlocale", os_setlocale}, | |
{"time", os_time}, | |
{"tmpname", os_tmpname}, | |
{NULL, NULL} | |
}; | |
/* }====================================================== */ | |
LUAMOD_API int luaopen_os (lua_State *L) { | |
luaL_newlib(L, syslib); | |
return 1; | |
} | |