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#ifndef SYSLINUX
10#include <locale.h>
11#endif
12#include <stdlib.h>
13#include <string.h>
14#include <time.h>
15
16#define loslib_c
17#define LUA_LIB
18
19#include "lua.h"
20
21#include "lauxlib.h"
22#include "lualib.h"
23
24
25#ifndef SYSLINUX
26/*
27** list of valid conversion specifiers for the 'strftime' function
28*/
29#if !defined(LUA_STRFTIMEOPTIONS)
30
31#if !defined(LUA_USE_POSIX)
32#define LUA_STRFTIMEOPTIONS	{ "aAbBcdHIjmMpSUwWxXyYz%", "" }
33#else
34#define LUA_STRFTIMEOPTIONS \
35	{ "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "" \
36	  "", "E", "cCxXyY",  \
37	  "O", "deHImMSuUVwWy" }
38#endif
39
40#endif
41
42
43
44/*
45** By default, Lua uses tmpnam except when POSIX is available, where it
46** uses mkstemp.
47*/
48#if defined(LUA_USE_MKSTEMP)
49#include <unistd.h>
50#define LUA_TMPNAMBUFSIZE	32
51#define lua_tmpnam(b,e) { \
52        strcpy(b, "/tmp/lua_XXXXXX"); \
53        e = mkstemp(b); \
54        if (e != -1) close(e); \
55        e = (e == -1); }
56
57#elif !defined(lua_tmpnam)
58
59#define LUA_TMPNAMBUFSIZE	L_tmpnam
60#define lua_tmpnam(b,e)		{ e = (tmpnam(b) == NULL); }
61
62#endif
63
64
65/*
66** By default, Lua uses gmtime/localtime, except when POSIX is available,
67** where it uses gmtime_r/localtime_r
68*/
69#if defined(LUA_USE_GMTIME_R)
70
71#define l_gmtime(t,r)		gmtime_r(t,r)
72#define l_localtime(t,r)	localtime_r(t,r)
73
74#elif !defined(l_gmtime)
75
76#define l_gmtime(t,r)		((void)r, gmtime(t))
77#define l_localtime(t,r)  	((void)r, localtime(t))
78
79#endif
80
81
82
83static int os_execute (lua_State *L) {
84  const char *cmd = luaL_optstring(L, 1, NULL);
85  int stat = system(cmd);
86  if (cmd != NULL)
87    return luaL_execresult(L, stat);
88  else {
89    lua_pushboolean(L, stat);  /* true if there is a shell */
90    return 1;
91  }
92}
93
94
95static int os_remove (lua_State *L) {
96  const char *filename = luaL_checkstring(L, 1);
97  return luaL_fileresult(L, remove(filename) == 0, filename);
98}
99
100
101static int os_rename (lua_State *L) {
102  const char *fromname = luaL_checkstring(L, 1);
103  const char *toname = luaL_checkstring(L, 2);
104  return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
105}
106
107
108static int os_tmpname (lua_State *L) {
109  char buff[LUA_TMPNAMBUFSIZE];
110  int err;
111  lua_tmpnam(buff, err);
112  if (err)
113    return luaL_error(L, "unable to generate a unique filename");
114  lua_pushstring(L, buff);
115  return 1;
116}
117#endif /* SYSLINUX */
118
119
120static int os_getenv (lua_State *L) {
121  lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
122  return 1;
123}
124
125
126#ifndef SYSLINUX
127static int os_clock (lua_State *L) {
128  lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
129  return 1;
130}
131
132
133/*
134** {======================================================
135** Time/Date operations
136** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
137**   wday=%w+1, yday=%j, isdst=? }
138** =======================================================
139*/
140
141static void setfield (lua_State *L, const char *key, int value) {
142  lua_pushinteger(L, value);
143  lua_setfield(L, -2, key);
144}
145
146static void setboolfield (lua_State *L, const char *key, int value) {
147  if (value < 0)  /* undefined? */
148    return;  /* does not set field */
149  lua_pushboolean(L, value);
150  lua_setfield(L, -2, key);
151}
152
153static int getboolfield (lua_State *L, const char *key) {
154  int res;
155  lua_getfield(L, -1, key);
156  res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
157  lua_pop(L, 1);
158  return res;
159}
160
161
162static int getfield (lua_State *L, const char *key, int d) {
163  int res, isnum;
164  lua_getfield(L, -1, key);
165  res = (int)lua_tointegerx(L, -1, &isnum);
166  if (!isnum) {
167    if (d < 0)
168      return luaL_error(L, "field " LUA_QS " missing in date table", key);
169    res = d;
170  }
171  lua_pop(L, 1);
172  return res;
173}
174
175
176static const char *checkoption (lua_State *L, const char *conv, char *buff) {
177  static const char *const options[] = LUA_STRFTIMEOPTIONS;
178  unsigned int i;
179  for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {
180    if (*conv != '\0' && strchr(options[i], *conv) != NULL) {
181      buff[1] = *conv;
182      if (*options[i + 1] == '\0') {  /* one-char conversion specifier? */
183        buff[2] = '\0';  /* end buffer */
184        return conv + 1;
185      }
186      else if (*(conv + 1) != '\0' &&
187               strchr(options[i + 1], *(conv + 1)) != NULL) {
188        buff[2] = *(conv + 1);  /* valid two-char conversion specifier */
189        buff[3] = '\0';  /* end buffer */
190        return conv + 2;
191      }
192    }
193  }
194  luaL_argerror(L, 1,
195    lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
196  return conv;  /* to avoid warnings */
197}
198
199
200static int os_date (lua_State *L) {
201  const char *s = luaL_optstring(L, 1, "%c");
202  time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
203  struct tm tmr, *stm;
204  if (*s == '!') {  /* UTC? */
205    stm = l_gmtime(&t, &tmr);
206    s++;  /* skip `!' */
207  }
208  else
209    stm = l_localtime(&t, &tmr);
210  if (stm == NULL)  /* invalid date? */
211    lua_pushnil(L);
212  else if (strcmp(s, "*t") == 0) {
213    lua_createtable(L, 0, 9);  /* 9 = number of fields */
214    setfield(L, "sec", stm->tm_sec);
215    setfield(L, "min", stm->tm_min);
216    setfield(L, "hour", stm->tm_hour);
217    setfield(L, "day", stm->tm_mday);
218    setfield(L, "month", stm->tm_mon+1);
219    setfield(L, "year", stm->tm_year+1900);
220    setfield(L, "wday", stm->tm_wday+1);
221    setfield(L, "yday", stm->tm_yday+1);
222    setboolfield(L, "isdst", stm->tm_isdst);
223  }
224  else {
225    char cc[4];
226    luaL_Buffer b;
227    cc[0] = '%';
228    luaL_buffinit(L, &b);
229    while (*s) {
230      if (*s != '%')  /* no conversion specifier? */
231        luaL_addchar(&b, *s++);
232      else {
233        size_t reslen;
234        char buff[200];  /* should be big enough for any conversion result */
235        s = checkoption(L, s + 1, cc);
236        reslen = strftime(buff, sizeof(buff), cc, stm);
237        luaL_addlstring(&b, buff, reslen);
238      }
239    }
240    luaL_pushresult(&b);
241  }
242  return 1;
243}
244
245
246static int os_time (lua_State *L) {
247  time_t t;
248  if (lua_isnoneornil(L, 1))  /* called without args? */
249    t = time(NULL);  /* get current time */
250  else {
251    struct tm ts;
252    luaL_checktype(L, 1, LUA_TTABLE);
253    lua_settop(L, 1);  /* make sure table is at the top */
254    ts.tm_sec = getfield(L, "sec", 0);
255    ts.tm_min = getfield(L, "min", 0);
256    ts.tm_hour = getfield(L, "hour", 12);
257    ts.tm_mday = getfield(L, "day", -1);
258    ts.tm_mon = getfield(L, "month", -1) - 1;
259    ts.tm_year = getfield(L, "year", -1) - 1900;
260    ts.tm_isdst = getboolfield(L, "isdst");
261    t = mktime(&ts);
262  }
263  if (t == (time_t)(-1))
264    lua_pushnil(L);
265  else
266    lua_pushnumber(L, (lua_Number)t);
267  return 1;
268}
269
270
271#ifndef LUA_NUMBER_INTEGRAL
272static int os_difftime (lua_State *L) {
273  lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
274                             (time_t)(luaL_optnumber(L, 2, 0))));
275  return 1;
276}
277#endif
278
279/* }====================================================== */
280
281
282static int os_setlocale (lua_State *L) {
283  static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
284                      LC_NUMERIC, LC_TIME};
285  static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
286     "numeric", "time", NULL};
287  const char *l = luaL_optstring(L, 1, NULL);
288  int op = luaL_checkoption(L, 2, "all", catnames);
289  lua_pushstring(L, setlocale(cat[op], l));
290  return 1;
291}
292#endif /* SYSLINUX */
293
294
295static int os_exit (lua_State *L) {
296  int status;
297  if (lua_isboolean(L, 1))
298    status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
299  else
300    status = luaL_optint(L, 1, EXIT_SUCCESS);
301  if (lua_toboolean(L, 2))
302    lua_close(L);
303  if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
304  return 0;
305}
306
307
308static const luaL_Reg syslib[] = {
309#ifndef SYSLINUX
310  {"clock",     os_clock},
311  {"date",      os_date},
312#ifndef LUA_NUMBER_INTEGRAL
313  {"difftime",  os_difftime},
314#endif
315  {"execute",   os_execute},
316#endif
317  {"exit",      os_exit},
318  {"getenv",    os_getenv},
319#ifndef SYSLINUX
320  {"remove",    os_remove},
321  {"rename",    os_rename},
322  {"setlocale", os_setlocale},
323  {"time",      os_time},
324  {"tmpname",   os_tmpname},
325#endif
326  {NULL, NULL}
327};
328
329/* }====================================================== */
330
331
332
333LUAMOD_API int luaopen_os (lua_State *L) {
334  luaL_newlib(L, syslib);
335  return 1;
336}
337
338