| /* |
| ** $Id: loslib.c,v 1.59 2015/07/06 15:16:51 roberto Exp roberto $ |
| ** Standard Operating System library |
| ** See Copyright Notice in lua.h |
| */ |
| |
| #define loslib_c |
| #define LUA_LIB |
| |
| #include "lprefix.h" |
| |
| |
| #include <errno.h> |
| #include <locale.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| |
| #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_C89) |
| #define LUA_STRFTIMEOPTIONS { "aAbBcdHIjmMpSUwWxXyYz%", "" } |
| #else /* C99 specification */ |
| #define LUA_STRFTIMEOPTIONS \ |
| { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "", \ |
| "E", "cCxXyY", \ |
| "O", "deHImMSuUVwWy" } |
| #endif |
| |
| #endif /* } */ |
| /* }================================================================== */ |
| |
| |
| /* |
| ** {================================================================== |
| ** Configuration for time-related stuff |
| ** =================================================================== |
| */ |
| |
| #if !defined(l_time_t) /* { */ |
| /* |
| ** type to represent time_t in Lua |
| */ |
| #define l_timet lua_Integer |
| #define l_pushtime(L,t) lua_pushinteger(L,(lua_Integer)(t)) |
| |
| static time_t l_checktime (lua_State *L, int arg) { |
| lua_Integer t = luaL_checkinteger(L, arg); |
| luaL_argcheck(L, (time_t)t == t, arg, "time out-of-bounds"); |
| return (time_t)t; |
| } |
| |
| #endif /* } */ |
| |
| |
| #if !defined(l_gmtime) /* { */ |
| /* |
| ** By default, Lua uses gmtime/localtime, except when POSIX is available, |
| ** where it uses gmtime_r/localtime_r |
| */ |
| |
| #if defined(LUA_USE_POSIX) /* { */ |
| |
| #define l_gmtime(t,r) gmtime_r(t,r) |
| #define l_localtime(t,r) localtime_r(t,r) |
| |
| #else /* }{ */ |
| |
| /* ISO C definitions */ |
| #define l_gmtime(t,r) ((void)(r)->tm_sec, gmtime(t)) |
| #define l_localtime(t,r) ((void)(r)->tm_sec, localtime(t)) |
| |
| #endif /* } */ |
| |
| #endif /* } */ |
| |
| /* }================================================================== */ |
| |
| |
| /* |
| ** {================================================================== |
| ** Configuration for 'tmpnam': |
| ** By default, Lua uses tmpnam except when POSIX is available, where |
| ** it uses mkstemp. |
| ** =================================================================== |
| */ |
| #if !defined(lua_tmpnam) /* { */ |
| |
| #if defined(LUA_USE_POSIX) /* { */ |
| |
| #include <unistd.h> |
| |
| #define LUA_TMPNAMBUFSIZE 32 |
| |
| #if !defined(LUA_TMPNAMTEMPLATE) |
| #define LUA_TMPNAMTEMPLATE "/tmp/lua_XXXXXX" |
| #endif |
| |
| #define lua_tmpnam(b,e) { \ |
| strcpy(b, LUA_TMPNAMTEMPLATE); \ |
| e = mkstemp(b); \ |
| if (e != -1) close(e); \ |
| e = (e == -1); } |
| |
| #else /* }{ */ |
| |
| /* ISO C definitions */ |
| #define LUA_TMPNAMBUFSIZE L_tmpnam |
| #define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); } |
| |
| #endif /* } */ |
| |
| #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; |
| res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1); |
| lua_pop(L, 1); |
| return res; |
| } |
| |
| |
| /* maximum value for date fields (to avoid arithmetic overflows with 'int') */ |
| #if !defined(L_MAXDATEFIELD) |
| #define L_MAXDATEFIELD (INT_MAX / 2) |
| #endif |
| |
| static int getfield (lua_State *L, const char *key, int d, int delta) { |
| int isnum; |
| int t = lua_getfield(L, -1, key); |
| lua_Integer res = lua_tointegerx(L, -1, &isnum); |
| if (!isnum) { /* field is not a number? */ |
| if (t != LUA_TNIL) /* some other value? */ |
| return luaL_error(L, "field '%s' not an integer", key); |
| else if (d < 0) /* absent field; no default? */ |
| return luaL_error(L, "field '%s' missing in date table", key); |
| res = d; |
| } |
| else { |
| if (!(-L_MAXDATEFIELD <= res && res <= L_MAXDATEFIELD)) |
| return luaL_error(L, "field '%s' out-of-bounds", key); |
| res -= delta; |
| } |
| lua_pop(L, 1); |
| return (int)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 */ |
| } |
| |
| |
| /* maximum size for an individual 'strftime' item */ |
| #define SIZETIMEFMT 250 |
| |
| |
| static int os_date (lua_State *L) { |
| const char *s = luaL_optstring(L, 1, "%c"); |
| time_t t = luaL_opt(L, l_checktime, 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? */ |
| luaL_error(L, "time result cannot be represented in this installation"); |
| 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 != '%') /* not a conversion specifier? */ |
| luaL_addchar(&b, *s++); |
| else { |
| size_t reslen; |
| char *buff = luaL_prepbuffsize(&b, SIZETIMEFMT); |
| s = checkoption(L, s + 1, cc); |
| reslen = strftime(buff, SIZETIMEFMT, cc, stm); |
| luaL_addsize(&b, 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, 0); |
| ts.tm_min = getfield(L, "min", 0, 0); |
| ts.tm_hour = getfield(L, "hour", 12, 0); |
| ts.tm_mday = getfield(L, "day", -1, 0); |
| 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)(l_timet)t || t == (time_t)(-1)) |
| luaL_error(L, "time result cannot be represented in this installation"); |
| l_pushtime(L, t); |
| return 1; |
| } |
| |
| |
| static int os_difftime (lua_State *L) { |
| time_t t1 = l_checktime(L, 1); |
| time_t t2 = l_checktime(L, 2); |
| lua_pushnumber(L, (lua_Number)difftime(t1, t2)); |
| 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 = (int)luaL_optinteger(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; |
| } |
| |