1 files changed, 502 insertions, 0 deletions
diff --git a/src/liolib.c b/src/liolib.c
new file mode 100644
index 00000000..ca9b8025
--- /dev/null
+++ b/src/liolib.c
@@ -0,0 +1,502 @@
+/*
+** $Id: liolib.c,v 2.57 2004/08/13 19:52:13 roberto Exp $
+** Standard I/O (and system) library
+** See Copyright Notice in lua.h
+*/
+
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define liolib_c
+#define LUA_LIB
+
+#include "lua.h"
+
+#include "lauxlib.h"
+#include "lualib.h"
+
+
+
+#define IO_INPUT		1
+#define IO_OUTPUT		2
+
+
+static const char *const fnames[] = {"input", "output"};
+
+
+static int pushresult (lua_State *L, int i, const char *filename) {
+  if (i) {
+    lua_pushboolean(L, 1);
+    return 1;
+  }
+  else {
+    lua_pushnil(L);
+    if (filename)
+      lua_pushfstring(L, "%s: %s", filename, strerror(errno));
+    else
+      lua_pushfstring(L, "%s", strerror(errno));
+    lua_pushinteger(L, errno);
+    return 3;
+  }
+}
+
+
+static void fileerror (lua_State *L, int arg, const char *filename) {
+  lua_pushfstring(L, "%s: %s", filename, strerror(errno));
+  luaL_argerror(L, arg, lua_tostring(L, -1));
+}
+
+
+static FILE **topfile (lua_State *L) {
+  FILE **f = (FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE);
+  if (f == NULL) luaL_argerror(L, 1, "bad file");
+  return f;
+}
+
+
+static int io_type (lua_State *L) {
+  FILE **f = (FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE);
+  if (f == NULL) lua_pushnil(L);
+  else if (*f == NULL)
+    lua_pushliteral(L, "closed file");
+  else
+    lua_pushliteral(L, "file");
+  return 1;
+}
+
+
+static FILE *tofile (lua_State *L) {
+  FILE **f = topfile(L);
+  if (*f == NULL)
+    luaL_error(L, "attempt to use a closed file");
+  return *f;
+}
+
+
+
+/*
+** When creating file handles, always creates a `closed' file handle
+** before opening the actual file; so, if there is a memory error, the
+** file is not left opened.
+*/
+static FILE **newfile (lua_State *L) {
+  FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
+  *pf = NULL;  /* file handle is currently `closed' */
+  luaL_getmetatable(L, LUA_FILEHANDLE);
+  lua_setmetatable(L, -2);
+  return pf;
+}
+
+
+static int aux_close (lua_State *L) {
+  FILE *f = tofile(L);
+  if (f == stdin || f == stdout || f == stderr)
+    return 0;  /* file cannot be closed */
+  else {
+    int ok = (fclose(f) == 0);
+    if (ok)
+      *(FILE **)lua_touserdata(L, 1) = NULL;  /* mark file as closed */
+    return ok;
+  }
+}
+
+
+static int io_close (lua_State *L) {
+  if (lua_isnone(L, 1) && lua_type(L, lua_upvalueindex(1)) == LUA_TTABLE)
+    lua_rawgeti(L, lua_upvalueindex(1), IO_OUTPUT);
+  return pushresult(L, aux_close(L), NULL);
+}
+
+
+static int io_gc (lua_State *L) {
+  FILE **f = topfile(L);
+  if (*f != NULL)  /* ignore closed files */
+    aux_close(L);
+  return 0;
+}
+
+
+static int io_tostring (lua_State *L) {
+  FILE *f = *topfile(L);
+  if (f == NULL)
+    lua_pushstring(L, "file (closed)");
+  else
+    lua_pushfstring(L, "file (%p)", f);
+  return 1;
+}
+
+
+static int io_open (lua_State *L) {
+  const char *filename = luaL_checkstring(L, 1);
+  const char *mode = luaL_optstring(L, 2, "r");
+  FILE **pf = newfile(L);
+  *pf = fopen(filename, mode);
+  return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
+}
+
+
+static int io_tmpfile (lua_State *L) {
+  FILE **pf = newfile(L);
+  *pf = tmpfile();
+  return (*pf == NULL) ? pushresult(L, 0, NULL) : 1;
+}
+
+
+static FILE *getiofile (lua_State *L, int findex) {
+  FILE *f;
+  lua_rawgeti(L, lua_upvalueindex(1), findex);
+  lua_assert(luaL_checkudata(L, -1, LUA_FILEHANDLE));
+  f = *(FILE **)lua_touserdata(L, -1);
+  if (f == NULL)
+    luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
+  return f;
+}
+
+
+static int g_iofile (lua_State *L, int f, const char *mode) {
+  if (!lua_isnoneornil(L, 1)) {
+    const char *filename = lua_tostring(L, 1);
+    if (filename) {
+      FILE **pf = newfile(L);
+      *pf = fopen(filename, mode);
+      if (*pf == NULL)
+        fileerror(L, 1, filename);
+    }
+    else {
+      tofile(L);  /* check that it's a valid file handle */
+      lua_pushvalue(L, 1);
+    }
+    lua_assert(luaL_checkudata(L, -1, LUA_FILEHANDLE));
+    lua_rawseti(L, lua_upvalueindex(1), f);
+  }
+  /* return current value */
+  lua_rawgeti(L, lua_upvalueindex(1), f);
+  return 1;
+}
+
+
+static int io_input (lua_State *L) {
+  return g_iofile(L, IO_INPUT, "r");
+}
+
+
+static int io_output (lua_State *L) {
+  return g_iofile(L, IO_OUTPUT, "w");
+}
+
+
+static int io_readline (lua_State *L);
+
+
+static void aux_lines (lua_State *L, int idx, int close) {
+  lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
+  lua_pushvalue(L, idx);
+  lua_pushboolean(L, close);  /* close/not close file when finished */
+  lua_pushcclosure(L, io_readline, 3);
+}
+
+
+static int f_lines (lua_State *L) {
+  tofile(L);  /* check that it's a valid file handle */
+  aux_lines(L, 1, 0);
+  return 1;
+}
+
+
+static int io_lines (lua_State *L) {
+  if (lua_isnoneornil(L, 1)) {  /* no arguments? */
+    /* will iterate over default input */
+    lua_rawgeti(L, lua_upvalueindex(1), IO_INPUT);
+    return f_lines(L);
+  }
+  else {
+    const char *filename = luaL_checkstring(L, 1);
+    FILE **pf = newfile(L);
+    *pf = fopen(filename, "r");
+    if (*pf == NULL)
+      fileerror(L, 1, filename);
+    aux_lines(L, lua_gettop(L), 1);
+    return 1;
+  }
+}
+
+
+/*
+** {======================================================
+** READ
+** =======================================================
+*/
+
+
+static int read_number (lua_State *L, FILE *f) {
+  lua_Number d;
+  if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
+    lua_pushnumber(L, d);
+    return 1;
+  }
+  else return 0;  /* read fails */
+}
+
+
+static int test_eof (lua_State *L, FILE *f) {
+  int c = getc(f);
+  ungetc(c, f);
+  lua_pushlstring(L, NULL, 0);
+  return (c != EOF);
+}
+
+
+static int read_line (lua_State *L, FILE *f) {
+  luaL_Buffer b;
+  luaL_buffinit(L, &b);
+  for (;;) {
+    size_t l;
+    char *p = luaL_prepbuffer(&b);
+    if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) {  /* eof? */
+      luaL_pushresult(&b);  /* close buffer */
+      return (lua_strlen(L, -1) > 0);  /* check whether read something */
+    }
+    l = strlen(p);
+    if (p[l-1] != '\n')
+      luaL_addsize(&b, l);
+    else {
+      luaL_addsize(&b, l - 1);  /* do not include `eol' */
+      luaL_pushresult(&b);  /* close buffer */
+      return 1;  /* read at least an `eol' */
+    }
+  }
+}
+
+
+static int read_chars (lua_State *L, FILE *f, size_t n) {
+  size_t rlen;  /* how much to read */
+  size_t nr;  /* number of chars actually read */
+  luaL_Buffer b;
+  luaL_buffinit(L, &b);
+  rlen = LUAL_BUFFERSIZE;  /* try to read that much each time */
+  do {
+    char *p = luaL_prepbuffer(&b);
+    if (rlen > n) rlen = n;  /* cannot read more than asked */
+    nr = fread(p, sizeof(char), rlen, f);
+    luaL_addsize(&b, nr);
+    n -= nr;  /* still have to read `n' chars */
+  } while (n > 0 && nr == rlen);  /* until end of count or eof */
+  luaL_pushresult(&b);  /* close buffer */
+  return (n == 0 || lua_strlen(L, -1) > 0);
+}
+
+
+static int g_read (lua_State *L, FILE *f, int first) {
+  int nargs = lua_gettop(L) - 1;
+  int success;
+  int n;
+  clearerr(f);
+  if (nargs == 0) {  /* no arguments? */
+    success = read_line(L, f);
+    n = first+1;  /* to return 1 result */
+  }
+  else {  /* ensure stack space for all results and for auxlib's buffer */
+    luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
+    success = 1;
+    for (n = first; nargs-- && success; n++) {
+      if (lua_type(L, n) == LUA_TNUMBER) {
+        size_t l = (size_t)lua_tointeger(L, n);
+        success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
+      }
+      else {
+        const char *p = lua_tostring(L, n);
+        luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
+        switch (p[1]) {
+          case 'n':  /* number */
+            success = read_number(L, f);
+            break;
+          case 'l':  /* line */
+            success = read_line(L, f);
+            break;
+          case 'a':  /* file */
+            read_chars(L, f, ~((size_t)0));  /* read MAX_SIZE_T chars */
+            success = 1; /* always success */
+            break;
+          case 'w':  /* word */
+            return luaL_error(L, "obsolete option `*w' to `read'");
+          default:
+            return luaL_argerror(L, n, "invalid format");
+        }
+      }
+    }
+  }
+  if (ferror(f))
+    return pushresult(L, 0, NULL);
+  if (!success) {
+    lua_pop(L, 1);  /* remove last result */
+    lua_pushnil(L);  /* push nil instead */
+  }
+  return n - first;
+}
+
+
+static int io_read (lua_State *L) {
+  return g_read(L, getiofile(L, IO_INPUT), 1);
+}
+
+
+static int f_read (lua_State *L) {
+  return g_read(L, tofile(L), 2);
+}
+
+
+static int io_readline (lua_State *L) {
+  FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(2));
+  int sucess;
+  if (f == NULL)  /* file is already closed? */
+    luaL_error(L, "file is already closed");
+  sucess = read_line(L, f);
+  if (ferror(f))
+    luaL_error(L, "%s", strerror(errno));
+  if (sucess) return 1;
+  else {  /* EOF */
+    if (lua_toboolean(L, lua_upvalueindex(3))) {  /* generator created file? */
+      lua_settop(L, 0);
+      lua_pushvalue(L, lua_upvalueindex(2));
+      aux_close(L);  /* close it */
+    }
+    return 0;
+  }
+}
+
+/* }====================================================== */
+
+
+static int g_write (lua_State *L, FILE *f, int arg) {
+  int nargs = lua_gettop(L) - 1;
+  int status = 1;
+  for (; nargs--; arg++) {
+    if (lua_type(L, arg) == LUA_TNUMBER) {
+      /* optimization: could be done exactly as for strings */
+      status = status &&
+          fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
+    }
+    else {
+      size_t l;
+      const char *s = luaL_checklstring(L, arg, &l);
+      status = status && (fwrite(s, sizeof(char), l, f) == l);
+    }
+  }
+  return pushresult(L, status, NULL);
+}
+
+
+static int io_write (lua_State *L) {
+  return g_write(L, getiofile(L, IO_OUTPUT), 1);
+}
+
+
+static int f_write (lua_State *L) {
+  return g_write(L, tofile(L), 2);
+}
+
+
+static int f_seek (lua_State *L) {
+  static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
+  static const char *const modenames[] = {"set", "cur", "end", NULL};
+  FILE *f = tofile(L);
+  int op = luaL_findstring(luaL_optstring(L, 2, "cur"), modenames);
+  lua_Integer offset = luaL_optinteger(L, 3, 0);
+  luaL_argcheck(L, op != -1, 2, "invalid mode");
+  op = fseek(f, offset, mode[op]);
+  if (op)
+    return pushresult(L, 0, NULL);  /* error */
+  else {
+    lua_pushinteger(L, ftell(f));
+    return 1;
+  }
+}
+
+
+static int f_setvbuf (lua_State *L) {
+  static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
+  static const char *const modenames[] = {"no", "full", "line", NULL};
+  FILE *f = tofile(L);
+  int op = luaL_findstring(luaL_checkstring(L, 2), modenames);
+  luaL_argcheck(L, op != -1, 2, "invalid mode");
+  return pushresult(L, setvbuf(f, NULL, mode[op], 0) == 0, NULL);
+}
+
+
+
+static int io_flush (lua_State *L) {
+  return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
+}
+
+
+static int f_flush (lua_State *L) {
+  return pushresult(L, fflush(tofile(L)) == 0, NULL);
+}
+
+
+static const luaL_reg iolib[] = {
+  {"input", io_input},
+  {"output", io_output},
+  {"lines", io_lines},
+  {"close", io_close},
+  {"flush", io_flush},
+  {"open", io_open},
+  {"read", io_read},
+  {"tmpfile", io_tmpfile},
+  {"type", io_type},
+  {"write", io_write},
+  {NULL, NULL}
+};
+
+
+static const luaL_reg flib[] = {
+  {"flush", f_flush},
+  {"read", f_read},
+  {"lines", f_lines},
+  {"seek", f_seek},
+  {"setvbuf", f_setvbuf},
+  {"write", f_write},
+  {"close", io_close},
+  {"__gc", io_gc},
+  {"__tostring", io_tostring},
+  {NULL, NULL}
+};
+
+
+static void createmeta (lua_State *L) {
+  luaL_newmetatable(L, LUA_FILEHANDLE);  /* create metatable for file handles */
+  lua_pushvalue(L, -1);  /* push metatable */
+  lua_setfield(L, -2, "__index");  /* metatable.__index = metatable */
+  luaL_openlib(L, NULL, flib, 0);  /* file methods */
+}
+
+
+static void createupval (lua_State *L) {
+  lua_newtable(L);
+  /* create (and set) default files */
+  *newfile(L) = stdin;
+  lua_rawseti(L, -2, IO_INPUT);
+  *newfile(L) = stdout;
+  lua_rawseti(L, -2, IO_OUTPUT);
+}
+
+
+
+LUALIB_API int luaopen_io (lua_State *L) {
+  createmeta(L);
+  createupval(L);
+  lua_pushvalue(L, -1);
+  luaL_openlib(L, LUA_IOLIBNAME, iolib, 1);
+  /* put predefined file handles into `io' table */
+  lua_rawgeti(L, -2, IO_INPUT);  /* get current input from metatable */
+  lua_setfield(L, -2, "stdin");  /* io.stdin = metatable[IO_INPUT] */
+  lua_rawgeti(L, -2, IO_OUTPUT);  /* get current output from metatable */
+  lua_setfield(L, -2, "stdout");  /* io.stdout = metatable[IO_OUTPUT] */
+  *newfile(L) = stderr;
+  lua_setfield(L, -2, "stderr");  /* io.stderr = newfile(stderr) */
+  return 1;
+}
+