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comparison src/lua/loslib.c @ 11:27763b933818

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raise lua sources up one level
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 11:07:39 -0600
parents src/lua/src/loslib.c@f9f4f1b99eed
children
comparison
equal deleted inserted replaced
10:48b74a4e4692 11:27763b933818
1 /*
2 ** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 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 static int os_pushresult (lua_State *L, int i, const char *filename) {
24 int en = errno; /* calls to Lua API may change this value */
25 if (i) {
26 lua_pushboolean(L, 1);
27 return 1;
28 }
29 else {
30 lua_pushnil(L);
31 lua_pushfstring(L, "%s: %s", filename, strerror(en));
32 lua_pushinteger(L, en);
33 return 3;
34 }
35 }
36
37
38 static int os_execute (lua_State *L) {
39 lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
40 return 1;
41 }
42
43
44 static int os_remove (lua_State *L) {
45 const char *filename = luaL_checkstring(L, 1);
46 return os_pushresult(L, remove(filename) == 0, filename);
47 }
48
49
50 static int os_rename (lua_State *L) {
51 const char *fromname = luaL_checkstring(L, 1);
52 const char *toname = luaL_checkstring(L, 2);
53 return os_pushresult(L, rename(fromname, toname) == 0, fromname);
54 }
55
56
57 static int os_tmpname (lua_State *L) {
58 char buff[LUA_TMPNAMBUFSIZE];
59 int err;
60 lua_tmpnam(buff, err);
61 if (err)
62 return luaL_error(L, "unable to generate a unique filename");
63 lua_pushstring(L, buff);
64 return 1;
65 }
66
67
68 static int os_getenv (lua_State *L) {
69 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
70 return 1;
71 }
72
73
74 static int os_clock (lua_State *L) {
75 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
76 return 1;
77 }
78
79
80 /*
81 ** {======================================================
82 ** Time/Date operations
83 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
84 ** wday=%w+1, yday=%j, isdst=? }
85 ** =======================================================
86 */
87
88 static void setfield (lua_State *L, const char *key, int value) {
89 lua_pushinteger(L, value);
90 lua_setfield(L, -2, key);
91 }
92
93 static void setboolfield (lua_State *L, const char *key, int value) {
94 if (value < 0) /* undefined? */
95 return; /* does not set field */
96 lua_pushboolean(L, value);
97 lua_setfield(L, -2, key);
98 }
99
100 static int getboolfield (lua_State *L, const char *key) {
101 int res;
102 lua_getfield(L, -1, key);
103 res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
104 lua_pop(L, 1);
105 return res;
106 }
107
108
109 static int getfield (lua_State *L, const char *key, int d) {
110 int res;
111 lua_getfield(L, -1, key);
112 if (lua_isnumber(L, -1))
113 res = (int)lua_tointeger(L, -1);
114 else {
115 if (d < 0)
116 return luaL_error(L, "field " LUA_QS " missing in date table", key);
117 res = d;
118 }
119 lua_pop(L, 1);
120 return res;
121 }
122
123
124 static int os_date (lua_State *L) {
125 const char *s = luaL_optstring(L, 1, "%c");
126 time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
127 struct tm *stm;
128 if (*s == '!') { /* UTC? */
129 stm = gmtime(&t);
130 s++; /* skip `!' */
131 }
132 else
133 stm = localtime(&t);
134 if (stm == NULL) /* invalid date? */
135 lua_pushnil(L);
136 else if (strcmp(s, "*t") == 0) {
137 lua_createtable(L, 0, 9); /* 9 = number of fields */
138 setfield(L, "sec", stm->tm_sec);
139 setfield(L, "min", stm->tm_min);
140 setfield(L, "hour", stm->tm_hour);
141 setfield(L, "day", stm->tm_mday);
142 setfield(L, "month", stm->tm_mon+1);
143 setfield(L, "year", stm->tm_year+1900);
144 setfield(L, "wday", stm->tm_wday+1);
145 setfield(L, "yday", stm->tm_yday+1);
146 setboolfield(L, "isdst", stm->tm_isdst);
147 }
148 else {
149 char cc[3];
150 luaL_Buffer b;
151 cc[0] = '%'; cc[2] = '\0';
152 luaL_buffinit(L, &b);
153 for (; *s; s++) {
154 if (*s != '%' || *(s + 1) == '\0') /* no conversion specifier? */
155 luaL_addchar(&b, *s);
156 else {
157 size_t reslen;
158 char buff[200]; /* should be big enough for any conversion result */
159 cc[1] = *(++s);
160 reslen = strftime(buff, sizeof(buff), cc, stm);
161 luaL_addlstring(&b, buff, reslen);
162 }
163 }
164 luaL_pushresult(&b);
165 }
166 return 1;
167 }
168
169
170 static int os_time (lua_State *L) {
171 time_t t;
172 if (lua_isnoneornil(L, 1)) /* called without args? */
173 t = time(NULL); /* get current time */
174 else {
175 struct tm ts;
176 luaL_checktype(L, 1, LUA_TTABLE);
177 lua_settop(L, 1); /* make sure table is at the top */
178 ts.tm_sec = getfield(L, "sec", 0);
179 ts.tm_min = getfield(L, "min", 0);
180 ts.tm_hour = getfield(L, "hour", 12);
181 ts.tm_mday = getfield(L, "day", -1);
182 ts.tm_mon = getfield(L, "month", -1) - 1;
183 ts.tm_year = getfield(L, "year", -1) - 1900;
184 ts.tm_isdst = getboolfield(L, "isdst");
185 t = mktime(&ts);
186 }
187 if (t == (time_t)(-1))
188 lua_pushnil(L);
189 else
190 lua_pushnumber(L, (lua_Number)t);
191 return 1;
192 }
193
194
195 static int os_difftime (lua_State *L) {
196 lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
197 (time_t)(luaL_optnumber(L, 2, 0))));
198 return 1;
199 }
200
201 /* }====================================================== */
202
203
204 static int os_setlocale (lua_State *L) {
205 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
206 LC_NUMERIC, LC_TIME};
207 static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
208 "numeric", "time", NULL};
209 const char *l = luaL_optstring(L, 1, NULL);
210 int op = luaL_checkoption(L, 2, "all", catnames);
211 lua_pushstring(L, setlocale(cat[op], l));
212 return 1;
213 }
214
215
216 static int os_exit (lua_State *L) {
217 exit(luaL_optint(L, 1, EXIT_SUCCESS));
218 }
219
220 static const luaL_Reg syslib[] = {
221 {"clock", os_clock},
222 {"date", os_date},
223 {"difftime", os_difftime},
224 {"execute", os_execute},
225 {"exit", os_exit},
226 {"getenv", os_getenv},
227 {"remove", os_remove},
228 {"rename", os_rename},
229 {"setlocale", os_setlocale},
230 {"time", os_time},
231 {"tmpname", os_tmpname},
232 {NULL, NULL}
233 };
234
235 /* }====================================================== */
236
237
238
239 LUALIB_API int luaopen_os (lua_State *L) {
240 luaL_register(L, LUA_OSLIBNAME, syslib);
241 return 1;
242 }
243