1/*
2** $Id: loslib.c,v 1.40.1.1 2013/04/12 18:48:47 roberto Exp $
3** Standard Operating System library
4** See Copyright Notice in lua.h
5*/
6
7
8#include <errno.h>
9#include <locale.h>
10#include <stdlib.h>
11#include <string.h>
12#include <time.h>
13
14#define loslib_c
15#define LUA_LIB
16
17#include "lua.h"
18
19#include "lauxlib.h"
20#include "lualib.h"
21
22
23/*
24** list of valid conversion specifiers for the 'strftime' function
25*/
26#if !defined(LUA_STRFTIMEOPTIONS)
27
28#if !defined(LUA_USE_POSIX)
29#define LUA_STRFTIMEOPTIONS	{ "aAbBcdHIjmMpSUwWxXyYz%", "" }
30#else
31#define LUA_STRFTIMEOPTIONS \
32	{ "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "" \
33	  "", "E", "cCxXyY",  \
34	  "O", "deHImMSuUVwWy" }
35#endif
36
37#endif
38
39
40
41/*
42** By default, Lua uses tmpnam except when POSIX is available, where it
43** uses mkstemp.
44*/
45#if defined(LUA_USE_MKSTEMP)
46#include <unistd.h>
47#define LUA_TMPNAMBUFSIZE	32
48#define lua_tmpnam(b,e) { \
49        strcpy(b, "/tmp/lua_XXXXXX"); \
50        e = mkstemp(b); \
51        if (e != -1) close(e); \
52        e = (e == -1); }
53
54#elif !defined(lua_tmpnam)
55
56#define LUA_TMPNAMBUFSIZE	L_tmpnam
57#define lua_tmpnam(b,e)		{ e = (tmpnam(b) == NULL); }
58
59#endif
60
61
62/*
63** By default, Lua uses gmtime/localtime, except when POSIX is available,
64** where it uses gmtime_r/localtime_r
65*/
66#if defined(LUA_USE_GMTIME_R)
67
68#define l_gmtime(t,r)		gmtime_r(t,r)
69#define l_localtime(t,r)	localtime_r(t,r)
70
71#elif !defined(l_gmtime)
72
73#define l_gmtime(t,r)		((void)r, gmtime(t))
74#define l_localtime(t,r)  	((void)r, localtime(t))
75
76#endif
77
78
79
80static int os_execute (lua_State *L) {
81  const char *cmd = luaL_optstring(L, 1, NULL);
82  int stat = system(cmd);
83  if (cmd != NULL)
84    return luaL_execresult(L, stat);
85  else {
86    lua_pushboolean(L, stat);  /* true if there is a shell */
87    return 1;
88  }
89}
90
91
92static int os_remove (lua_State *L) {
93  const char *filename = luaL_checkstring(L, 1);
94  return luaL_fileresult(L, remove(filename) == 0, filename);
95}
96
97
98static int os_rename (lua_State *L) {
99  const char *fromname = luaL_checkstring(L, 1);
100  const char *toname = luaL_checkstring(L, 2);
101  return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
102}
103
104
105static int os_tmpname (lua_State *L) {
106  char buff[LUA_TMPNAMBUFSIZE];
107  int err;
108  lua_tmpnam(buff, err);
109  if (err)
110    return luaL_error(L, "unable to generate a unique filename");
111  lua_pushstring(L, buff);
112  return 1;
113}
114
115
116static int os_getenv (lua_State *L) {
117  lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
118  return 1;
119}
120
121
122static int os_clock (lua_State *L) {
123  lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
124  return 1;
125}
126
127
128/*
129** {======================================================
130** Time/Date operations
131** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
132**   wday=%w+1, yday=%j, isdst=? }
133** =======================================================
134*/
135
136static void setfield (lua_State *L, const char *key, int value) {
137  lua_pushinteger(L, value);
138  lua_setfield(L, -2, key);
139}
140
141static void setboolfield (lua_State *L, const char *key, int value) {
142  if (value < 0)  /* undefined? */
143    return;  /* does not set field */
144  lua_pushboolean(L, value);
145  lua_setfield(L, -2, key);
146}
147
148static int getboolfield (lua_State *L, const char *key) {
149  int res;
150  lua_getfield(L, -1, key);
151  res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
152  lua_pop(L, 1);
153  return res;
154}
155
156
157static int getfield (lua_State *L, const char *key, int d) {
158  int res, isnum;
159  lua_getfield(L, -1, key);
160  res = (int)lua_tointegerx(L, -1, &isnum);
161  if (!isnum) {
162    if (d < 0)
163      return luaL_error(L, "field " LUA_QS " missing in date table", key);
164    res = d;
165  }
166  lua_pop(L, 1);
167  return res;
168}
169
170
171static const char *checkoption (lua_State *L, const char *conv, char *buff) {
172  static const char *const options[] = LUA_STRFTIMEOPTIONS;
173  unsigned int i;
174  for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {
175    if (*conv != '\0' && strchr(options[i], *conv) != NULL) {
176      buff[1] = *conv;
177      if (*options[i + 1] == '\0') {  /* one-char conversion specifier? */
178        buff[2] = '\0';  /* end buffer */
179        return conv + 1;
180      }
181      else if (*(conv + 1) != '\0' &&
182               strchr(options[i + 1], *(conv + 1)) != NULL) {
183        buff[2] = *(conv + 1);  /* valid two-char conversion specifier */
184        buff[3] = '\0';  /* end buffer */
185        return conv + 2;
186      }
187    }
188  }
189  luaL_argerror(L, 1,
190    lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
191  return conv;  /* to avoid warnings */
192}
193
194
195static int os_date (lua_State *L) {
196  const char *s = luaL_optstring(L, 1, "%c");
197  time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
198  struct tm tmr, *stm;
199  if (*s == '!') {  /* UTC? */
200    stm = l_gmtime(&t, &tmr);
201    s++;  /* skip `!' */
202  }
203  else
204    stm = l_localtime(&t, &tmr);
205  if (stm == NULL)  /* invalid date? */
206    lua_pushnil(L);
207  else if (strcmp(s, "*t") == 0) {
208    lua_createtable(L, 0, 9);  /* 9 = number of fields */
209    setfield(L, "sec", stm->tm_sec);
210    setfield(L, "min", stm->tm_min);
211    setfield(L, "hour", stm->tm_hour);
212    setfield(L, "day", stm->tm_mday);
213    setfield(L, "month", stm->tm_mon+1);
214    setfield(L, "year", stm->tm_year+1900);
215    setfield(L, "wday", stm->tm_wday+1);
216    setfield(L, "yday", stm->tm_yday+1);
217    setboolfield(L, "isdst", stm->tm_isdst);
218  }
219  else {
220    char cc[4];
221    luaL_Buffer b;
222    cc[0] = '%';
223    luaL_buffinit(L, &b);
224    while (*s) {
225      if (*s != '%')  /* no conversion specifier? */
226        luaL_addchar(&b, *s++);
227      else {
228        size_t reslen;
229        char buff[200];  /* should be big enough for any conversion result */
230        s = checkoption(L, s + 1, cc);
231        reslen = strftime(buff, sizeof(buff), cc, stm);
232        luaL_addlstring(&b, buff, reslen);
233      }
234    }
235    luaL_pushresult(&b);
236  }
237  return 1;
238}
239
240
241static int os_time (lua_State *L) {
242  time_t t;
243  if (lua_isnoneornil(L, 1))  /* called without args? */
244    t = time(NULL);  /* get current time */
245  else {
246    struct tm ts;
247    luaL_checktype(L, 1, LUA_TTABLE);
248    lua_settop(L, 1);  /* make sure table is at the top */
249    ts.tm_sec = getfield(L, "sec", 0);
250    ts.tm_min = getfield(L, "min", 0);
251    ts.tm_hour = getfield(L, "hour", 12);
252    ts.tm_mday = getfield(L, "day", -1);
253    ts.tm_mon = getfield(L, "month", -1) - 1;
254    ts.tm_year = getfield(L, "year", -1) - 1900;
255    ts.tm_isdst = getboolfield(L, "isdst");
256    t = mktime(&ts);
257  }
258  if (t == (time_t)(-1))
259    lua_pushnil(L);
260  else
261    lua_pushnumber(L, (lua_Number)t);
262  return 1;
263}
264
265
266static int os_difftime (lua_State *L) {
267  lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
268                             (time_t)(luaL_optnumber(L, 2, 0))));
269  return 1;
270}
271
272/* }====================================================== */
273
274
275static int os_setlocale (lua_State *L) {
276  static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
277                      LC_NUMERIC, LC_TIME};
278  static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
279     "numeric", "time", NULL};
280  const char *l = luaL_optstring(L, 1, NULL);
281  int op = luaL_checkoption(L, 2, "all", catnames);
282  lua_pushstring(L, setlocale(cat[op], l));
283  return 1;
284}
285
286
287static int os_exit (lua_State *L) {
288  int status;
289  if (lua_isboolean(L, 1))
290    status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
291  else
292    status = luaL_optint(L, 1, EXIT_SUCCESS);
293  if (lua_toboolean(L, 2))
294    lua_close(L);
295  if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
296  return 0;
297}
298
299
300static const luaL_Reg syslib[] = {
301  {"clock",     os_clock},
302  {"date",      os_date},
303  {"difftime",  os_difftime},
304  {"execute",   os_execute},
305  {"exit",      os_exit},
306  {"getenv",    os_getenv},
307  {"remove",    os_remove},
308  {"rename",    os_rename},
309  {"setlocale", os_setlocale},
310  {"time",      os_time},
311  {"tmpname",   os_tmpname},
312  {NULL, NULL}
313};
314
315/* }====================================================== */
316
317
318
319LUAMOD_API int luaopen_os (lua_State *L) {
320  luaL_newlib(L, syslib);
321  return 1;
322}
323
324