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/* System module */
/*
Various bits of information used by the interpreter are collected in
module 'sys'.
Function member:
- exit(sts): call (C, POSIX) exit(sts)
Data members:
- stdin, stdout, stderr: standard file objects
- modules: the table of modules (dictionary)
- path: module search path (list of strings)
- argv: script arguments (list of strings)
- ps1, ps2: optional primary and secondary prompts (strings)
*/
#include "allobjects.h"
#include "sysmodule.h"
#include "import.h"
#include "modsupport.h"
/* Define delimiter used in $PYTHONPATH */
#ifdef THINK_C
#define DELIM ' '
#endif
#ifndef DELIM
#define DELIM ':'
#endif
static object *sysdict;
object *
sysget(name)
char *name;
{
return dictlookup(sysdict, name);
}
FILE *
sysgetfile(name, def)
char *name;
FILE *def;
{
FILE *fp = NULL;
object *v = sysget(name);
if (v != NULL)
fp = getfilefile(v);
if (fp == NULL)
fp = def;
return fp;
}
int
sysset(name, v)
char *name;
object *v;
{
if (v == NULL)
return dictremove(sysdict, name);
else
return dictinsert(sysdict, name, v);
}
static object *
sys_exit(self, args)
object *self;
object *args;
{
int sts;
if (!getintarg(args, &sts))
return NULL;
goaway(sts);
exit(sts); /* Just in case */
/* NOTREACHED */
}
static struct methodlist sys_methods[] = {
{"exit", sys_exit},
{NULL, NULL} /* sentinel */
};
static object *sysin, *sysout, *syserr;
void
initsys()
{
object *m = initmodule("sys", sys_methods);
sysdict = getmoduledict(m);
INCREF(sysdict);
/* NB keep an extra ref to the std files to avoid closing them
when the user deletes them */
/* XXX File objects should have a "don't close" flag instead */
sysin = newopenfileobject(stdin, "<stdin>", "r");
sysout = newopenfileobject(stdout, "<stdout>", "w");
syserr = newopenfileobject(stderr, "<stderr>", "w");
if (err_occurred())
fatal("can't create sys.std* file objects");
dictinsert(sysdict, "stdin", sysin);
dictinsert(sysdict, "stdout", sysout);
dictinsert(sysdict, "stderr", syserr);
dictinsert(sysdict, "modules", get_modules());
if (err_occurred())
fatal("can't insert sys.* objects in sys dict");
}
static object *
makepathobject(path, delim)
char *path;
int delim;
{
int i, n;
char *p;
object *v, *w;
n = 1;
p = path;
while ((p = strchr(p, delim)) != NULL) {
n++;
p++;
}
v = newlistobject(n);
if (v == NULL)
return NULL;
for (i = 0; ; i++) {
p = strchr(path, delim);
if (p == NULL)
p = strchr(path, '\0'); /* End of string */
w = newsizedstringobject(path, (int) (p - path));
if (w == NULL) {
DECREF(v);
return NULL;
}
setlistitem(v, i, w);
if (*p == '\0')
break;
path = p+1;
}
return v;
}
void
setpythonpath(path)
char *path;
{
object *v;
if ((v = makepathobject(path, DELIM)) == NULL)
fatal("can't create sys.path");
if (sysset("path", v) != 0)
fatal("can't assign sys.path");
DECREF(v);
}
static object *
makeargvobject(argc, argv)
int argc;
char **argv;
{
object *av;
if (argc < 0 || argv == NULL)
argc = 0;
av = newlistobject(argc);
if (av != NULL) {
int i;
for (i = 0; i < argc; i++) {
object *v = newstringobject(argv[i]);
if (v == NULL) {
DECREF(av);
av = NULL;
break;
}
setlistitem(av, i, v);
}
}
return av;
}
void
setpythonargv(argc, argv)
int argc;
char **argv;
{
object *av = makeargvobject(argc, argv);
if (av == NULL)
fatal("no mem for sys.argv");
if (sysset("argv", av) != 0)
fatal("can't assign sys.argv");
DECREF(av);
}
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