new parameters for "read" and "write". BIG CHANGE.

This commit is contained in:
Roberto Ierusalimschy 1996-11-01 15:03:36 -02:00
parent 2f44cc9f4d
commit 450465c4d4

566
iolib.c
View File

@ -1,10 +1,3 @@
/*
** iolib.c
** Input/output library to LUA
*/
char *rcs_iolib="$Id: iolib.c,v 1.47 1996/08/01 14:55:33 roberto Exp roberto $";
#include <stdio.h>
#include <ctype.h>
#include <string.h>
@ -16,7 +9,8 @@ char *rcs_iolib="$Id: iolib.c,v 1.47 1996/08/01 14:55:33 roberto Exp roberto $";
#include "luadebug.h"
#include "lualib.h"
static FILE *in, *out;
FILE *lua_infile, *lua_outfile;
#ifdef POPEN
@ -31,496 +25,194 @@ int pclose();
static void pushresult (int i)
{
if (i)
lua_pushnumber (1);
}
static void closeread (void)
{
if (in != stdin)
{
if (pclose(in) == -1)
fclose(in);
in = stdin;
lua_pushuserdata(NULL);
else {
lua_pushnil();
lua_pushstring(strerror(errno));
}
}
static void closewrite (void)
static void closefile (FILE *f)
{
if (out != stdout)
{
if (pclose(out) == -1)
fclose(out);
out = stdout;
}
if (f == stdin || f == stdout)
return;
if (f == lua_infile)
lua_infile = stdin;
if (f == lua_outfile)
lua_outfile = stdout;
if (pclose(f) == -1)
fclose(f);
}
/*
** Open a file to read.
** LUA interface:
** status = readfrom (filename)
** where:
** status = 1 -> success
** status = nil -> error
*/
static void io_readfrom (void)
{
if (lua_getparam (1) == LUA_NOOBJECT)
{ /* restore standart input */
closeread();
lua_pushnumber (1);
}
else
{
char *s = lua_check_string(1, "readfrom");
FILE *fp = (*s == '|') ? popen(s+1, "r") : fopen(s, "r");
if (fp == NULL)
lua_pushnil();
else
{
closeread();
in = fp;
lua_pushnumber (1);
}
}
lua_Object f = lua_getparam(1);
if (f == LUA_NOOBJECT)
closefile(lua_infile); /* restore standart input */
else if (lua_isuserdata(f))
lua_infile = lua_getuserdata(f);
else {
char *s = lua_check_string(1, "readfrom");
FILE *fp = (*s == '|') ? popen(s+1, "r") : fopen(s, "r");
if (fp)
lua_infile = fp;
else {
pushresult(0);
return;
}
}
lua_pushuserdata(lua_infile);
}
/*
** Open a file to write.
** LUA interface:
** status = writeto (filename)
** where:
** status = 1 -> success
** status = nil -> error
*/
static void io_writeto (void)
{
if (lua_getparam (1) == LUA_NOOBJECT) /* restore standart output */
{
closewrite();
lua_pushnumber (1);
}
else
{
char *s = lua_check_string(1, "writeto");
FILE *fp = (*s == '|') ? popen(s+1,"w") : fopen(s,"w");
if (fp)
{
closewrite();
out = fp;
lua_pushnumber (1);
}
}
lua_Object f = lua_getparam(1);
if (f == LUA_NOOBJECT)
closefile(lua_outfile); /* restore standart output */
else if (lua_isuserdata(f))
lua_outfile = lua_getuserdata(f);
else {
char *s = lua_check_string(1, "writeto");
FILE *fp = (*s == '|') ? popen(s+1,"w") : fopen(s,"w");
if (fp)
lua_outfile = fp;
else {
pushresult(0);
return;
}
}
lua_pushuserdata(lua_outfile);
}
/*
** Open a file to write appended.
** LUA interface:
** status = appendto (filename)
** where:
** status = 1 -> success
** status = nil -> error
*/
static void io_appendto (void)
{
char *s = lua_check_string(1, "appendto");
FILE *fp = fopen (s, "a");
if (fp)
{
if (out != stdout) fclose (out);
out = fp;
lua_pushnumber(1);
}
}
static char getformat (char *f, int *just, long *m, int *n)
{
int t;
switch (*f++)
{
case 'q': case 'Q':
case 's': case 'S':
case 'i': case 'I':
t = tolower(*(f-1));
break;
case 'f': case 'F': case 'g': case 'G': case 'e': case 'E':
t = 'f';
break;
default:
t = 0; /* to avoid compiler warnings */
lua_arg_check(0, "read/write (format)");
}
*just = (*f == '<' || *f == '>' || *f == '|') ? *f++ : '>';
if (isdigit(*f))
{
*m = 0;
while (isdigit(*f))
*m = *m*10 + (*f++ - '0');
char *s = lua_check_string(1, "appendto");
FILE *fp = fopen (s, "a");
if (fp != NULL) {
lua_outfile = fp;
lua_pushuserdata(lua_outfile);
}
else
*m = -1;
if (*f == '.')
{
f++; /* skip point */
*n = 0;
while (isdigit(*f))
*n = *n*10 + (*f++ - '0');
}
else
*n = -1;
return t;
pushresult(0);
}
/*
** Read a variable. On error put nil on stack.
** LUA interface:
** variable = read ([format])
**
** O formato pode ter um dos seguintes especificadores:
**
** s ou S -> para string
** f ou F, g ou G, e ou E -> para reais
** i ou I -> para inteiros
**
** Estes especificadores podem vir seguidos de numero que representa
** o numero de campos a serem lidos.
*/
static int read_until_char (int del)
{
int c;
while((c = fgetc(in)) != EOF && c != del)
luaI_addchar(c);
return c;
}
static void read_until_blank (void)
{
int c;
while((c = fgetc(in)) != EOF && !isspace(c))
luaI_addchar(c);
if (c != EOF) ungetc(c,in);
}
static void read_m (size_t m)
{
int c;
while (m-- && (c = fgetc(in)) != EOF)
luaI_addchar(c);
}
static void read_free (void)
{
int c;
while (isspace(c=fgetc(in)))
;
if (c == EOF)
return;
if (c == '\"' || c == '\'')
{ /* string */
c = read_until_char(c);
if (c != EOF)
lua_pushstring(luaI_addchar(0));
}
else
{
double d;
char dummy;
char *s;
luaI_addchar(c);
read_until_blank();
s = luaI_addchar(0);
if (sscanf(s, "%lf %c", &d, &dummy) == 1)
lua_pushnumber(d);
else
lua_pushstring(s);
}
}
#define NEED_OTHER (EOF-1) /* just some flag different from EOF */
static void io_read (void)
{
lua_Object o = lua_getparam (1);
luaI_addchar(0); /* initialize buffer */
if (o == LUA_NOOBJECT) /* free format */
read_free();
else /* formatted */
{
long m;
int dummy1, dummy2;
switch (getformat(lua_check_string(1, "read"), &dummy1, &m, &dummy2))
{
case 's':
{
char *s;
if (m < 0)
read_until_blank();
else
read_m(m);
s = luaI_addchar(0);
if ((m >= 0 && strlen(s) == m) || (m < 0 && strlen(s) > 0))
lua_pushstring(s);
break;
}
case 'i': /* can read as float, since it makes no difference to Lua */
case 'f':
{
double d;
int result;
if (m < 0)
result = fscanf(in, "%lf", &d);
else
{
read_m(m);
result = sscanf(luaI_addchar(0), "%lf", &d);
}
if (result == 1)
lua_pushnumber(d);
break;
}
default:
lua_arg_check(0, "read (format)");
}
}
}
/*
** Read characters until a given one. The delimiter is not read.
*/
static void io_readuntil (void)
{
int del, c;
lua_Object p = lua_getparam(1);
luaI_addchar(0); /* initialize buffer */
if (p == LUA_NOOBJECT || lua_isnil(p))
del = EOF;
else
del = *lua_check_string(1, "readuntil");
c = read_until_char(del);
if (c != EOF) ungetc(c,in);
lua_pushstring(luaI_addchar(0));
}
/*
** Write a variable. On error put 0 on stack, otherwise put 1.
** LUA interface:
** status = write (variable [,format])
**
** O formato pode ter um dos seguintes especificadores:
**
** s ou S -> para string
** f ou F, g ou G, e ou E -> para reais
** i ou I -> para inteiros
**
** Estes especificadores podem vir seguidos de:
**
** [?][m][.n]
**
** onde:
** ? -> indica justificacao
** < = esquerda
** | = centro
** > = direita (default)
** m -> numero maximo de campos (se exceder estoura)
** n -> indica precisao para
** reais -> numero de casas decimais
** inteiros -> numero minimo de digitos
** string -> nao se aplica
*/
static int write_fill (size_t n, int c)
{
while (n--)
if (fputc(c, out) == EOF)
return 0;
return 1;
}
static int write_string (char *s, int just, long m)
{
int status;
size_t l = strlen(s);
size_t pre; /* number of blanks before string */
if (m < 0) m = l;
else if (l > m)
{
write_fill(m, '*');
return 0;
}
pre = (just == '<') ? 0 : (just == '>') ? m-l : (m-l)/2;
status = write_fill(pre, ' ');
status = status && fprintf(out, "%s", s) >= 0;
status = status && write_fill(m-(l+pre), ' ');
return status;
}
static int write_quoted (int just, long m)
{
char *buff;
char *p = lua_opt_string(1, "[^\n]*{\n}", "read");
int inskip = 0; /* to control {skips} */
int c = NEED_OTHER;
luaI_addchar(0);
luaI_addquoted(lua_check_string(1, "write"));
return write_string(luaI_addchar(0), just, m);
}
static int write_float (int just, long m, int n)
{
char buffer[100];
lua_Object p = lua_getparam(1);
float number;
if (!lua_isnumber(p)) return 0;
number = lua_getnumber(p);
if (n >= 0)
sprintf(buffer, "%.*f", n, number);
else
sprintf(buffer, "%g", number);
return write_string(buffer, just, m);
}
static int write_int (int just, long m, int n)
{
char buffer[100];
lua_Object p = lua_getparam(1);
int number;
if (!lua_isnumber(p)) return 0;
number = (int)lua_getnumber(p);
if (n >= 0)
sprintf(buffer, "%.*d", n, number);
else
sprintf(buffer, "%d", number);
return write_string(buffer, just, m);
while (*p) {
if (*p == '{' || *p == '}') {
inskip = (*p == '{');
p++;
}
else {
char *ep = item_end(p); /* get what is next */
int m;
if (c == NEED_OTHER) c = getc(lua_infile);
if ((m = singlematch(c, p)) != 0) {
if (!inskip) luaI_addchar(c);
c = NEED_OTHER;
}
switch (*ep) {
case '*': /* repetition */
if (!m) p = ep+1; /* else stay in (repeat) the same item */
break;
case '?': /* optional */
p = ep+1; /* continues reading the pattern */
break;
default:
if (m) p = ep; /* continues reading the pattern */
else
goto break_while; /* pattern fails */
}
}
} break_while:
if (c >= 0) /* not EOF nor NEED_OTHER? */
ungetc(c, lua_infile);
buff = luaI_addchar(0);
if (*buff != 0 || *p == 0) /* read something or did not fail? */
lua_pushstring(buff);
}
static void io_write (void)
{
int status = 0;
if (lua_getparam (2) == LUA_NOOBJECT) /* free format */
{
lua_Object o1 = lua_getparam(1);
int t = lua_type(o1);
if (t == LUA_T_NUMBER)
status = fprintf (out, "%g", lua_getnumber(o1)) >= 0;
else if (t == LUA_T_STRING)
status = fprintf (out, "%s", lua_getstring(o1)) >= 0;
}
else /* formated */
{
long m;
int just, n;
switch (getformat(lua_check_string(2, "write"), &just, &m, &n))
{
case 's':
{
lua_Object p = lua_getparam(1);
if (lua_isstring(p))
status = write_string(lua_getstring(p), just, m);
else
status = 0;
break;
}
case 'q':
status = write_quoted(just, m);
break;
case 'f':
status = write_float(just, m, n);
break;
case 'i':
status = write_int(just, m, n);
break;
}
}
if (status)
lua_pushnumber(status);
int arg = 1;
int status = 1;
char *s;
while ((s = lua_opt_string(arg++, NULL, "write")) != NULL)
status = status && (fputs(s, lua_outfile) != EOF);
pushresult(status);
}
/*
** Execute a executable program using "system".
** Return the result of execution.
*/
static void io_execute (void)
{
lua_pushnumber(system(lua_check_string(1, "execute")));
}
/*
** Remove a file. On error return nil.
*/
static void io_remove (void)
{
pushresult(remove(lua_check_string(1, "remove")) == 0);
}
static void io_rename (void)
{
char *f1 = lua_check_string(1, "rename");
char *f2 = lua_check_string(2, "rename");
pushresult(rename(f1, f2) == 0);
pushresult(rename(lua_check_string(1, "rename"),
lua_check_string(2, "rename")) == 0);
}
static void io_tmpname (void)
{
lua_pushstring(tmpnam(NULL));
}
static void io_errorno (void)
{
/* lua_pushstring(strerror(errno));*/
}
/*
** To get an environment variable
*/
static void io_getenv (void)
{
char *env = getenv(lua_check_string(1, "getenv"));
lua_pushstring(env); /* if NULL push nil */
lua_pushstring(getenv(lua_check_string(1, "getenv"))); /* if NULL push nil */
}
/*
** Return user formatted time stamp
*/
static void io_date (void)
{
time_t t;
struct tm *tm;
char *s;
char b[BUFSIZ];
if (lua_getparam(1) == LUA_NOOBJECT)
s = "%c";
else
s = lua_check_string(1, "date");
time(&t); tm = localtime(&t);
if (strftime(b,sizeof(b),s,tm))
lua_pushstring(b);
else
lua_error("invalid `date' format");
time_t t;
struct tm *tm;
char *s = lua_opt_string(1, "%c", "date");
char b[BUFSIZ];
time(&t); tm = localtime(&t);
if (strftime(b,sizeof(b),s,tm))
lua_pushstring(b);
else
lua_error("invalid `date' format");
}
/*
** To exit
*/
static void io_exit (void)
{
lua_Object o = lua_getparam(1);
int code = lua_isnumber(o) ? (int)lua_getnumber(o) : 1;
exit(code);
lua_Object o = lua_getparam(1);
exit(lua_isnumber(o) ? (int)lua_getnumber(o) : 1);
}
/*
** To debug a lua program. Start a dialog with the user, interpreting
lua commands until an 'cont'.
*/
static void io_debug (void)
{
while (1)
{
while (1) {
char buffer[250];
fprintf(stderr, "lua_debug> ");
if (fgets(buffer, sizeof(buffer), stdin) == 0) return;
@ -535,21 +227,18 @@ static void lua_printstack (FILE *f)
int level = 0;
lua_Object func;
fprintf(f, "Active Stack:\n");
while ((func = lua_stackedfunction(level++)) != LUA_NOOBJECT)
{
while ((func = lua_stackedfunction(level++)) != LUA_NOOBJECT) {
char *name;
int currentline;
fprintf(f, "\t");
switch (*lua_getobjname(func, &name))
{
switch (*lua_getobjname(func, &name)) {
case 'g':
fprintf(f, "function %s", name);
break;
case 'f':
fprintf(f, "`%s' fallback", name);
break;
default:
{
default: {
char *filename;
int linedefined;
lua_funcinfo(func, &filename, &linedefined);
@ -570,8 +259,7 @@ static void lua_printstack (FILE *f)
static void errorfb (void)
{
lua_Object o = lua_getparam(1);
char *s = lua_isstring(o) ? lua_getstring(o) : "(no messsage)";
char *s = lua_opt_string(1, "(no messsage)", NULL);
fprintf(stderr, "lua: %s\n", s);
lua_printstack(stderr);
}
@ -582,13 +270,11 @@ static struct lua_reg iolib[] = {
{"writeto", io_writeto},
{"appendto", io_appendto},
{"read", io_read},
{"readuntil",io_readuntil},
{"write", io_write},
{"execute", io_execute},
{"remove", io_remove},
{"rename", io_rename},
{"tmpname", io_tmpname},
{"ioerror", io_errorno},
{"getenv", io_getenv},
{"date", io_date},
{"exit", io_exit},
@ -598,7 +284,7 @@ static struct lua_reg iolib[] = {
void iolib_open (void)
{
in=stdin; out=stdout;
lua_infile=stdin; lua_outfile=stdout;
luaI_openlib(iolib, (sizeof(iolib)/sizeof(iolib[0])));
lua_setfallback("error", errorfb);
}