re-implementation of functions "write" and "read"

This commit is contained in:
Roberto Ierusalimschy 1995-11-10 15:55:48 -02:00
parent 5f664a4516
commit f57afd6e32

509
iolib.c
View File

@ -3,7 +3,7 @@
** Input/output library to LUA
*/
char *rcs_iolib="$Id: iolib.c,v 1.26 1995/10/26 14:21:56 roberto Exp roberto $";
char *rcs_iolib="$Id: iolib.c,v 1.27 1995/11/03 15:43:50 roberto Exp roberto $";
#include <stdio.h>
#include <ctype.h>
@ -20,26 +20,14 @@ char *rcs_iolib="$Id: iolib.c,v 1.26 1995/10/26 14:21:56 roberto Exp roberto $";
static FILE *in=stdin, *out=stdout;
#ifndef POPEN
#ifdef POPEN
FILE *popen();
int pclose();
#else
#define popen(x,y) NULL /* that is, popen always fails */
#define pclose(x) (-1)
#endif
static void str_error(char *funcname)
{
char buff[250];
sprintf(buff, "incorrect arguments to function `%s'", funcname);
lua_error(buff);
}
static char *check_and_get_string (int numArg, char *funcname)
{
lua_Object o = lua_getparam(numArg);
if (!(lua_isstring(o) || lua_isnumber(o)))
str_error(funcname);
return lua_getstring(o);
}
static void closeread (void)
{
@ -67,7 +55,7 @@ static void closewrite (void)
** status = readfrom (filename)
** where:
** status = 1 -> success
** status = 0 -> error
** status = nil -> error
*/
static void io_readfrom (void)
{
@ -78,10 +66,10 @@ static void io_readfrom (void)
}
else
{
char *s = check_and_get_string(1, "readfrom");
char *s = lua_check_string(1, "readfrom");
FILE *fp = (*s == '|') ? popen(s+1, "r") : fopen(s, "r");
if (fp == NULL)
lua_pushnumber (0);
lua_pushnil();
else
{
closeread();
@ -98,7 +86,7 @@ static void io_readfrom (void)
** status = writeto (filename)
** where:
** status = 1 -> success
** status = 0 -> error
** status = nil -> error
*/
static void io_writeto (void)
{
@ -109,10 +97,10 @@ static void io_writeto (void)
}
else
{
char *s = check_and_get_string(1, "writeto");
char *s = lua_check_string(1, "writeto");
FILE *fp = (*s == '|') ? popen(s+1,"w") : fopen(s,"w");
if (fp == NULL)
lua_pushnumber (0);
lua_pushnil();
else
{
closewrite();
@ -130,16 +118,16 @@ static void io_writeto (void)
** where:
** status = 2 -> success (already exist)
** status = 1 -> success (new file)
** status = 0 -> error
** status = nil -> error
*/
static void io_appendto (void)
{
char *s = check_and_get_string(1, "appendto");
char *s = lua_check_string(1, "appendto");
struct stat st;
int r = (stat(s, &st) == -1) ? 1 : 2;
FILE *fp = fopen (s, "a");
if (fp == NULL)
lua_pushnumber (0);
lua_pushnil();
else
{
if (out != stdout) fclose (out);
@ -149,6 +137,72 @@ static void io_appendto (void)
}
static char getformat (char *f, int *just, int *m, int *n)
{
int t;
switch (*f++)
{
case 's': case 'S':
t = 's';
break;
case 'f': case 'F': case 'g': case 'G': case 'e': case 'E':
t = 'f';
break;
case 'i': case 'I':
t = 'i';
break;
default:
t = 0; /* to avoid compiler warnings */
lua_arg_error("read/write (format)");
}
*just = (*f == '<' || *f == '>' || *f == '|') ? *f++ : '>';
if (isdigit(*f))
{
*m = 0;
while (isdigit(*f))
*m = *m*10 + (*f++ - '0');
}
else
*m = -1;
if (*f == '.')
{
f++; /* skip point */
*n = 0;
while (isdigit(*f))
*n = *n*10 + (*f++ - '0');
}
else
*n = -1;
return t;
}
static char *add_char (int c)
{
static char *buff = NULL;
static int max = 0;
static int n = 0;
if (n >= max)
{
if (max == 0)
{
max = 100;
buff = (char *)malloc(max);
}
else
{
max *= 2;
buff = (char *)realloc(buff, max);
}
if (buff == NULL)
lua_error("memory overflow");
}
buff[n++] = c;
if (c == 0)
n = 0; /* prepare for next string */
return buff;
}
/*
** Read a variable. On error put nil on stack.
** LUA interface:
@ -163,125 +217,100 @@ static void io_appendto (void)
** Estes especificadores podem vir seguidos de numero que representa
** o numero de campos a serem lidos.
*/
static void io_read (void)
static int read_until_char (int del)
{
int c;
while((c = fgetc(in)) != EOF && c != del)
add_char(c);
return c;
}
static int read_until_blank (void)
{
int c;
while((c = fgetc(in)) != EOF && !isspace(c))
add_char(c);
return c;
}
static void read_m (int m)
{
int c;
while (m-- && (c = fgetc(in)) != EOF)
add_char(c);
}
static void read_free (void)
{
lua_Object o = lua_getparam (1);
if (o == LUA_NOOBJECT) /* free format */
{
int c;
char s[256];
while (isspace(c=fgetc(in)))
;
if (c == '\"' || c == '\'')
{
int del = c;
int n=0;
while((c = fgetc(in)) != del)
{
{ /* string */
c = read_until_char(c);
if (c == EOF)
{
lua_pushnil ();
return;
add_char(0); /* to be ready for next time */
lua_pushnil();
}
s[n++] = c;
}
s[n] = 0;
else
lua_pushstring(add_char(0));
}
else
{
double d;
ungetc (c, in);
if (fscanf (in, "%s", s) != 1)
{
lua_pushnil ();
return;
}
if (sscanf(s, "%lf %*c", &d) == 1)
{
lua_pushnumber (d);
return;
}
double d;
char dummy;
char *s;
add_char(c);
read_until_blank();
s = add_char(0);
if (sscanf(s, "%lf %c", &d, &dummy) == 1)
lua_pushnumber(d);
else
lua_pushstring(s);
}
lua_pushstring (s);
return;
}
else /* formatted */
{
char *e = check_and_get_string(1, "read");
char t;
int m=0;
while (isspace(*e)) e++;
t = *e++;
while (isdigit(*e))
m = m*10 + (*e++ - '0');
if (m > 0)
}
static void io_read (void)
{
lua_Object o = lua_getparam (1);
if (o == LUA_NOOBJECT) /* free format */
read_free();
else /* formatted */
{
char f[80];
char s[256];
sprintf (f, "%%%ds", m);
if (fgets (s, m+1, in) == NULL)
{
lua_pushnil();
return;
}
else
{
if (s[strlen(s)-1] == '\n')
s[strlen(s)-1] = 0;
}
switch (tolower(t))
{
case 'i':
int m, dummy1, dummy2;
switch (getformat(lua_check_string(1, "read"), &dummy1, &m, &dummy2))
{
long int l;
sscanf (s, "%ld", &l);
lua_pushnumber(l);
case 's':
if (m < 0)
read_until_blank();
else
read_m(m);
lua_pushstring(add_char(0));
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(add_char(0), "%lf", &d);
}
if (result == 1)
lua_pushnumber(d);
else
lua_pushnil();
break;
}
}
break;
case 'f': case 'g': case 'e':
{
float fl;
sscanf (s, "%f", &fl);
lua_pushnumber(fl);
}
break;
default:
lua_pushstring(s);
break;
}
}
else
{
switch (tolower(t))
{
case 'i':
{
long int l;
if (fscanf (in, "%ld", &l) == EOF)
lua_pushnil();
else lua_pushnumber(l);
}
break;
case 'f': case 'g': case 'e':
{
float f;
if (fscanf (in, "%f", &f) == EOF)
lua_pushnil();
else lua_pushnumber(f);
}
break;
default:
{
char s[256];
if (fscanf (in, "%s", s) == EOF)
lua_pushnil();
else lua_pushstring(s);
}
break;
}
}
}
}
@ -290,33 +319,13 @@ static void io_read (void)
*/
static void io_readuntil (void)
{
int n=255,m=0;
int c,d;
char *s;
lua_Object lo = lua_getparam(1);
if (!lua_isstring(lo))
d = EOF;
else
d = *lua_getstring(lo);
s = (char *)malloc(n+1);
while((c = fgetc(in)) != EOF && c != d)
{
if (m==n)
{
n *= 2;
s = (char *)realloc(s, n+1);
}
s[m++] = c;
}
int del = *lua_check_string(1, "readuntil");
int c = read_until_char(del);
if (c != EOF) ungetc(c,in);
s[m] = 0;
lua_pushstring(s);
free(s);
lua_pushstring(add_char(0));
}
/*
** Write a variable. On error put 0 on stack, otherwise put 1.
** LUA interface:
@ -343,106 +352,100 @@ static void io_readuntil (void)
** inteiros -> numero minimo de digitos
** string -> nao se aplica
*/
static char *buildformat (char *e, lua_Object o)
{
static char buffer[2048];
static char f[80];
char *string = &buffer[255];
char *fstart=e, *fspace, *send;
char t, j='r';
int m=0, n=-1, l;
while (isspace(*e)) e++;
fspace = e;
t = *e++;
if (*e == '<' || *e == '|' || *e == '>') j = *e++;
while (isdigit(*e))
m = m*10 + (*e++ - '0');
if (*e == '.') e++; /* skip point */
while (isdigit(*e))
if (n < 0) n = (*e++ - '0');
else n = n*10 + (*e++ - '0');
sprintf(f,"%%");
if (j == '<' || j == '|') sprintf(strchr(f,0),"-");
if (m > 0) sprintf(strchr(f,0),"%d", m);
if (n >= 0) sprintf(strchr(f,0),".%d", n);
switch (t)
{
case 'i': case 'I': t = 'd';
sprintf(strchr(f,0), "%c", t);
sprintf (string, f, (long int)lua_getnumber(o));
break;
case 'f': case 'g': case 'e': case 'G': case 'E':
sprintf(strchr(f,0), "%c", t);
sprintf (string, f, (float)lua_getnumber(o));
break;
case 'F': t = 'f';
sprintf(strchr(f,0), "%c", t);
sprintf (string, f, (float)lua_getnumber(o));
break;
case 's': case 'S': t = 's';
sprintf(strchr(f,0), "%c", t);
sprintf (string, f, lua_getstring(o));
break;
default: return "";
}
l = strlen(string);
send = string+l;
if (m!=0 && l>m)
{
int i;
for (i=0; i<m; i++)
string[i] = '*';
string[i] = 0;
}
else if (m!=0 && j=='|')
{
int k;
int i=l-1;
while (isspace(string[i]) || string[i]==0) i--;
string -= (m-i)/2;
for(k=0; k<(m-i)/2; k++)
string[k] = ' ';
}
/* add space characteres */
while (fspace != fstart)
{
string--;
fspace--;
*string = *fspace;
}
while (isspace(*e)) *send++ = *e++;
*send = 0;
return string;
static int write_fill (int n, int c)
{
while (n--)
if (fputc(c, out) == EOF)
return 0;
return 1;
}
static int write_string (char *s, int just, int m)
{
int status;
int l = strlen(s);
int 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_float (int just, int 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, int 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);
}
static void io_write (void)
{
lua_Object o1 = lua_getparam (1);
lua_Object o2 = lua_getparam (2);
if (o1 == LUA_NOOBJECT) /* new line */
{
fprintf (out, "\n");
lua_pushnumber(1);
}
else if (o2 == LUA_NOOBJECT) /* free format */
{
int status=0;
if (lua_isnumber(o1))
status = fprintf (out, "%g", lua_getnumber(o1));
else if (lua_isstring(o1))
status = fprintf (out, "%s", lua_getstring(o1));
lua_pushnumber(status);
}
else /* formated */
{
if (!lua_isstring(o2))
{
lua_error ("incorrect format to function `write'");
lua_pushnumber(0);
return;
int status = 0;
if (lua_getparam (2) == LUA_NOOBJECT) /* free format */
{
lua_Object o1 = lua_getparam(1);
if (lua_isnumber(o1))
status = fprintf (out, "%g", lua_getnumber(o1)) >= 0;
else if (lua_isstring(o1))
status = fprintf (out, "%s", lua_getstring(o1)) >= 0;
}
lua_pushnumber(fprintf (out, "%s", buildformat(lua_getstring(o2),o1)));
}
else /* formated */
{
int just, m, 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 'f':
status = write_float(just, m, n);
break;
case 'i':
status = write_int(just, m, n);
break;
}
}
if (status)
lua_pushnumber(status);
else
lua_pushnil();
}
/*
@ -451,19 +454,18 @@ static void io_write (void)
*/
static void io_execute (void)
{
lua_pushnumber(system(check_and_get_string(1, "execute")));
lua_pushnumber(system(lua_check_string(1, "execute")));
}
/*
** Remove a file.
** On error put 0 on stack, otherwise put 1.
** Remove a file. On error return nil.
*/
static void io_remove (void)
{
if (remove(check_and_get_string(1, "remove")) == 0)
if (remove(lua_check_string(1, "remove")) == 0)
lua_pushnumber (1);
else
lua_pushnumber (0);
lua_pushnil();
}
@ -472,7 +474,7 @@ static void io_remove (void)
*/
static void io_getenv (void)
{
char *env = getenv(check_and_get_string(1, "getenv"));
char *env = getenv(lua_check_string(1, "getenv"));
if (env == NULL) lua_pushnil();
else lua_pushstring(env);
}
@ -612,3 +614,4 @@ void iolib_open (void)
lua_register ("print_stack", errorfb);
lua_setfallback("error", errorfb);
}