liolib.c-Dateireferenz

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"

Include-Abhängigkeitsdiagramm für liolib.c:

gehe zum Quellcode dieser Datei

Makrodefinitionen
#define	liolib_c
#define	LUA_LIB
#define	IO_INPUT   1
#define	IO_OUTPUT   2
#define	tofilep(L)   ((FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE))
#define	SCAN_NUM_MAX_CHARS   11

Funktionen
static int	pushresult (lua_State *L, int i, const char *filename)
static void	fileerror (lua_State *L, int arg, const char *filename)
static int	io_type (lua_State *L)
static FILE *	tofile (lua_State *L)
static FILE **	newfile (lua_State *L)
static int	io_noclose (lua_State *L)
static int	io_fclose (lua_State *L)
static int	aux_close (lua_State *L)
static int	io_close (lua_State *L)
static int	io_gc (lua_State *L)
static int	io_tostring (lua_State *L)
static int	io_open (lua_State *L)
static FILE *	getiofile (lua_State *L, int findex)
static int	g_iofile (lua_State *L, int f, const char *mode)
static int	io_input (lua_State *L)
static int	io_output (lua_State *L)
static int	io_readline (lua_State *L)
static void	aux_lines (lua_State *L, int idx, int toclose)
static int	f_lines (lua_State *L)
static int	io_lines (lua_State *L)
static int	scan_num (FILE *f, int *r)
static int	read_number (lua_State *L, FILE *f)
static int	test_eof (lua_State *L, FILE *f)
static int	read_line (lua_State *L, FILE *f)
static int	read_chars (lua_State *L, FILE *f, size_t n)
static int	g_read (lua_State *L, FILE *f, int first)
static int	io_read (lua_State *L)
static int	f_read (lua_State *L)
static int	g_write (lua_State *L, FILE *f, int arg)
static int	io_write (lua_State *L)
static int	f_write (lua_State *L)
static int	f_seek (lua_State *L)
static int	io_flush (lua_State *L)
static int	f_flush (lua_State *L)
static int	f_getfptr (lua_State *L)
static void	createmeta (lua_State *L)
static void	createstdfile (lua_State *L, FILE *f, int k, const char *fname)
static void	newfenv (lua_State *L, lua_CFunction cls)
LUALIB_API int	luaopen_io (lua_State *L)

Variablen
static const char *const	fnames [] = {"input", "output"}
static const luaL_Reg	iolib []
static const luaL_Reg	flib []

Makro-Dokumentation

#define IO_INPUT   1

Definiert in Zeile 21 der Datei liolib.c.

#define IO_OUTPUT   2

Definiert in Zeile 22 der Datei liolib.c.

#define liolib_c

Definiert in Zeile 13 der Datei liolib.c.

#define LUA_LIB

Definiert in Zeile 14 der Datei liolib.c.

#define SCAN_NUM_MAX_CHARS   11

Definiert in Zeile 278 der Datei liolib.c.

#define tofilep

(

L)

((FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE))

Definiert in Zeile 52 der Datei liolib.c.

Dokumentation der Funktionen

static int aux_close ( lua_State *  L)

static

Definiert in Zeile 128 der Datei liolib.c.

                                    {
  lua_getfenv(L, 1);
  lua_getfield(L, -1, "__close");
  return (lua_tocfunction(L, -1))(L);
}

static void aux_lines ( lua_State *  L, int  idx, int  toclose  )

static

Definiert in Zeile 240 der Datei liolib.c.

                                                           {
  lua_pushvalue(L, idx);
  lua_pushboolean(L, toclose);  /* close/not close file when finished */
  lua_pushcclosure(L, io_readline, 2);
}

static void createmeta ( lua_State *  L)

static

Definiert in Zeile 595 der Datei liolib.c.

                                      {
  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_register(L, NULL, flib);  /* file methods */
}

static void createstdfile ( lua_State *  L, FILE *  f, int  k, const char *  fname  )

static

Definiert in Zeile 603 der Datei liolib.c.

                                                                            {
  *newfile(L) = f;
  if (k > 0) {
    lua_pushvalue(L, -1);
    lua_rawseti(L, LUA_ENVIRONINDEX, k);
  }
  lua_pushvalue(L, -2);  /* copy environment */
  lua_setfenv(L, -2);  /* set it */
  lua_setfield(L, -3, fname);
}

static int f_flush ( lua_State *  L)

static

Definiert in Zeile 547 der Datei liolib.c.

                                  {
  return pushresult(L, fflush(tofile(L)) == 0, NULL);
}

static int f_getfptr ( lua_State *  L)

static

Definiert in Zeile 551 der Datei liolib.c.

                                   {
  FILE *f = tofile(L);
  lua_pushinteger(L, (int)f);
  return 1;
}

static int f_lines ( lua_State *  L)

static

Definiert in Zeile 247 der Datei liolib.c.

                                  {
  tofile(L);  /* check that it's a valid file handle */
  aux_lines(L, 1, 0);
  return 1;
}

static int f_read ( lua_State *  L)

static

Definiert in Zeile 447 der Datei liolib.c.

                                 {
  return g_read(L, tofile(L), 2);
}

static int f_seek ( lua_State *  L)

static

Definiert in Zeile 512 der Datei liolib.c.

                                 {
  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_checkoption(L, 2, "cur", modenames);
  long offset = luaL_optlong(L, 3, 0);
  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_write ( lua_State *  L)

static

Definiert in Zeile 507 der Datei liolib.c.

                                  {
  return g_write(L, tofile(L), 2);
}

static void fileerror ( lua_State *  L, int  arg, const char *  filename  )

static

Definiert in Zeile 46 der Datei liolib.c.

                                                                    {
  lua_pushfstring(L, "%s: %s", filename, strerror(errno));
  luaL_argerror(L, arg, lua_tostring(L, -1));
}

static int g_iofile ( lua_State *  L, int  f, const char *  mode  )

static

Definiert in Zeile 206 der Datei liolib.c.

                                                            {
  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_rawseti(L, LUA_ENVIRONINDEX, f);
  }
  /* return current value */
  lua_rawgeti(L, LUA_ENVIRONINDEX, f);
  return 1;
}

static int g_read ( lua_State *  L, FILE *  f, int  first  )

static

Definiert in Zeile 389 der Datei liolib.c.

                                                     {
  int nargs = lua_gettop(L) - 1;
  int success;
  int n;
// no error state to clear
#if 0
  clearerr(f);
#endif
  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;
          default:
            return luaL_argerror(L, n, "invalid format");
        }
      }
    }
  }
// we have no ferror
#if 0
  if (ferror(f))
    return pushresult(L, 0, NULL);
#endif
  if (!success) {
    lua_pop(L, 1);  /* remove last result */
    lua_pushnil(L);  /* push nil instead */
  }
  return n - first;
}

static int g_write ( lua_State *  L, FILE *  f, int  arg  )

static

Definiert in Zeile 477 der Datei liolib.c.

                                                    {
  int nargs = lua_gettop(L) - 1;
  int status = 1;
  for (; nargs--; arg++) {
    if (lua_type(L, arg) == LUA_TNUMBER) {
      char s[12];
      sprintf(s,LUA_NUMBER_FMT,lua_tonumber(L,arg));
      /* optimization: could be done exactly as for strings */
      status = status &&
#if 0
          fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
#else
          fwrite(s, sizeof(char), strlen(s), f);
#endif
    }
    else {
      size_t l;
      const char *s = luaL_checklstring(L, arg, &l);
      status = status && ((size_t)fwrite(s, sizeof(char), l, f) == l);
    }
  }
  return pushresult(L, status, NULL);
}

static FILE* getiofile ( lua_State *  L, int  findex  )

static

Definiert in Zeile 196 der Datei liolib.c.

                                                  {
  FILE *f;
  lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
  f = *(FILE **)lua_touserdata(L, -1);
  if (f == NULL)
    luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
  return f;
}

static int io_close ( lua_State *  L)

static

Definiert in Zeile 135 der Datei liolib.c.

                                   {
  if (lua_isnone(L, 1))
    lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);
  tofile(L);  /* make sure argument is a file */
  return aux_close(L);
}

static int io_fclose ( lua_State *  L)

static

Definiert in Zeile 120 der Datei liolib.c.

                                    {
  FILE **p = tofilep(L);
  int ok = (fclose(*p) == 0);
  *p = NULL;
  return pushresult(L, ok, NULL);
}

static int io_flush ( lua_State *  L)

static

Definiert in Zeile 542 der Datei liolib.c.

                                   {
  return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
}

static int io_gc ( lua_State *  L)

static

Definiert in Zeile 143 der Datei liolib.c.

                                {
  FILE *f = *tofilep(L);
  /* ignore closed files */
  if (f != NULL)
    aux_close(L);
  return 0;
}

static int io_input ( lua_State *  L)

static

Definiert in Zeile 227 der Datei liolib.c.

                                   {
  return g_iofile(L, IO_INPUT, "r");
}

static int io_lines ( lua_State *  L)

static

Definiert in Zeile 254 der Datei liolib.c.

                                   {
  if (lua_isnoneornil(L, 1)) {  /* no arguments? */
    /* will iterate over default input */
    lua_rawgeti(L, LUA_ENVIRONINDEX, 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;
  }
}

static int io_noclose ( lua_State *  L)

static

Definiert in Zeile 96 der Datei liolib.c.

                                     {
  lua_pushnil(L);
  lua_pushliteral(L, "cannot close standard file");
  return 2;
}

static int io_open ( lua_State *  L)

static

Definiert in Zeile 162 der Datei liolib.c.

                                  {
  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_output ( lua_State *  L)

static

Definiert in Zeile 232 der Datei liolib.c.

                                    {
  return g_iofile(L, IO_OUTPUT, "w");
}

static int io_read ( lua_State *  L)

static

Definiert in Zeile 442 der Datei liolib.c.

                                  {
  return g_read(L, getiofile(L, IO_INPUT), 1);
}

static int io_readline ( lua_State *  L)

static

Definiert in Zeile 452 der Datei liolib.c.

                                      {
  FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(1));
  int sucess;
  if (f == NULL)  /* file is already closed? */
    luaL_error(L, "file is already closed");
  sucess = read_line(L, f);
// we have no ferror
#if 0
  if (ferror(f))
    return luaL_error(L, "%s", strerror(errno));
#endif
  if (sucess) return 1;
  else {  /* EOF */
    if (lua_toboolean(L, lua_upvalueindex(2))) {  /* generator created file? */
      lua_settop(L, 0);
      lua_pushvalue(L, lua_upvalueindex(1));
      aux_close(L);  /* close it */
    }
    return 0;
  }
}

static int io_tostring ( lua_State *  L)

static

Definiert in Zeile 152 der Datei liolib.c.

                                      {
  FILE *f = *tofilep(L);
  if (f == NULL)
    lua_pushliteral(L, "file (closed)");
  else
    lua_pushfstring(L, "file (%p)", f);
  return 1;
}

static int io_type ( lua_State *  L)

static

Definiert in Zeile 55 der Datei liolib.c.

                                  {
  void *ud;
  luaL_checkany(L, 1);
  ud = lua_touserdata(L, 1);
  lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
  if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))
    lua_pushnil(L);  /* not a file */
  else if (*((FILE **)ud) == NULL)
    lua_pushliteral(L, "closed file");
  else
    lua_pushliteral(L, "file");
  return 1;
}

static int io_write ( lua_State *  L)

static

Definiert in Zeile 502 der Datei liolib.c.

                                   {
  return g_write(L, getiofile(L, IO_OUTPUT), 1);
}

LUALIB_API int luaopen_io

(

lua_State *

L)

Definiert in Zeile 622 der Datei liolib.c.

                                         {
  createmeta(L);
  /* create (private) environment (with fields IO_INPUT, IO_OUTPUT, __close) */
  newfenv(L, io_fclose);
  lua_replace(L, LUA_ENVIRONINDEX);
  /* open library */
  luaL_register(L, LUA_IOLIBNAME, iolib);
  /* create (and set) default files */
  newfenv(L, io_noclose);  /* close function for default files */
#ifdef HOST_LUA
  createstdfile(L, stdin, IO_INPUT, "stdin");
  createstdfile(L, stdout, IO_OUTPUT, "stdout");
  createstdfile(L, stderr, 0, "stderr");
#else
// initialize them in the closed state
// stderr/stdout could go to regular files or script console
  createstdfile(L, NULL, IO_INPUT, "stdin");
  createstdfile(L, NULL, IO_OUTPUT, "stdout");
  createstdfile(L, NULL, 0, "stderr");
#endif
  lua_pop(L, 1);  /* pop environment for default files */
  // reyalp - no popen
#if 0
  lua_getfield(L, -1, "popen");
  newfenv(L, io_pclose);  /* create environment for 'popen' */
  lua_setfenv(L, -2);  /* set fenv for 'popen' */
  lua_pop(L, 1);  /* pop 'popen' */
#endif
  return 1;
}

static void newfenv ( lua_State *  L, lua_CFunction  cls  )

static

Definiert in Zeile 615 der Datei liolib.c.

                                                      {
  lua_createtable(L, 0, 1);
  lua_pushcfunction(L, cls);
  lua_setfield(L, -2, "__close");
}

static FILE** newfile ( lua_State *  L)

static

Definiert in Zeile 84 der Datei liolib.c.

                                     {
  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 pushresult ( lua_State *  L, int  i, const char *  filename  )

static

Definiert in Zeile 28 der Datei liolib.c.

                                                                  {
  int en = errno;  /* calls to Lua API may change this value */
  if (i) {
    lua_pushboolean(L, 1);
    return 1;
  }
  else {
    lua_pushnil(L);
    if (filename)
      lua_pushfstring(L, "%s: %s", filename, strerror(en));
    else
      lua_pushfstring(L, "%s", strerror(en));
    lua_pushinteger(L, en);
    return 3;
  }
}

static int read_chars ( lua_State *  L, FILE *  f, size_t  n  )

static

Definiert in Zeile 371 der Datei liolib.c.

                                                        {
  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_objlen(L, -1) > 0);
}

static int read_line ( lua_State *  L, FILE *  f  )

static

Definiert in Zeile 349 der Datei liolib.c.

                                             {
  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_objlen(L, -1) > 0);  /* check whether read something */
    }
    l = strlen(p);
    if (l == 0 || 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_number ( lua_State *  L, FILE *  f  )

static

Definiert in Zeile 315 der Datei liolib.c.

                                               {
  lua_Number d;
// no fscanf
#if 0
  if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
#else
  if (scan_num(f,&d) == 1) {
#endif
    lua_pushnumber(L, d);
    return 1;
  }
  else {
    lua_pushnil(L);  /* "result" to be removed */
    return 0;  /* read fails */
  }
}

static int scan_num ( FILE *  f, int *  r  )

static

Definiert in Zeile 282 der Datei liolib.c.

                                    {
  char c;
  int count=0;
  int neg=0;
  char s[SCAN_NUM_MAX_CHARS];
  do {
    if(fread(&c,1,1,f) != 1) return 0;
  } while( isspace(c) );
  if(c == '-') {
    neg=1;
    if(fread(&c,1,1,f) != 1) return 0;
  }
  while( count < SCAN_NUM_MAX_CHARS ) {
    if(isdigit(c)) {
      s[count++] = c;
    }
    else {
      fseek(f,-1,SEEK_CUR);
      if(count < 1 )
        return 0;
      else
        break;
    }
    if( fread(&c,1,1,f) != 1 ) break;
  }
  s[count] = 0;
  if(count) {
    *r = (neg) ? -atoi(s) : atoi(s);
    return 1;
  }
  return 0;
}

static int test_eof ( lua_State *  L, FILE *  f  )

static

Definiert in Zeile 341 der Datei liolib.c.

                                            {
  lua_pushlstring(L, NULL, 0);
  // TODO not sure why getc/ungetc was used
  return !feof(f);
}

static FILE* tofile ( lua_State *  L)

static

Definiert in Zeile 70 der Datei liolib.c.

                                   {
  FILE **f = tofilep(L);
  if (*f == NULL)
    luaL_error(L, "attempt to use a closed file");
  return *f;
}

Variablen-Dokumentation

const luaL_Reg flib[]

static

Initialisierung:

= {
  {"close", io_close},
  {"flush", f_flush},
  {"lines", f_lines},
  {"read", f_read},
  {"seek", f_seek},



  {"write", f_write},
  {"_getfptr",f_getfptr}, 
  {"__gc", io_gc},
  {"__tostring", io_tostring},
  {NULL, NULL}
}

Definiert in Zeile 578 der Datei liolib.c.

const char* const fnames[] = {"input", "output"}

static

Definiert in Zeile 25 der Datei liolib.c.

const luaL_Reg iolib[]

static

Initialisierung:

= {
  {"close", io_close},
  {"flush", io_flush},
  {"input", io_input},
  {"lines", io_lines},
  {"open", io_open},
  {"output", io_output},



  {"read", io_read},
  



  {"type", io_type},
  {"write", io_write},
  {NULL, NULL}
}

Definiert in Zeile 557 der Datei liolib.c.