1 files changed, 323 insertions, 0 deletions

diff --git a/loslib.c b/loslib.c
new file mode 100644
index 00000000..5170fd0d
--- /dev/null
+++ b/loslib.c
@@ -0,0 +1,323 @@
+/*
+** $Id: loslib.c,v 1.40 2012/10/19 15:54:02 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;
+}
+