/*** $Id: loslib.c,v 1.39 2012/05/23 15:37:09 roberto Exp $** Standard Operating System library** See Copyright Notice in lua.h*//* plan9 hackery: typedef incompatibility struct tm, int on stm */ #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, fromname);}  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 = (struct tm *) l_gmtime(&t, &tmr);    s++;  /* skip `!' */  }  else    stm = (struct tm *) 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;}