cpython/Modules/main.c

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/***********************************************************
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Copyright (c) 2000, BeOpen.com.
Copyright (c) 1995-2000, Corporation for National Research Initiatives.
Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
All rights reserved.
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See the file "Misc/COPYRIGHT" for information on usage and
redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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******************************************************************/
/* Python interpreter main program */
#include "Python.h"
#include "osdefs.h"
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#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
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#ifdef MS_WINDOWS
#include <fcntl.h>
#endif
#if defined(PYOS_OS2) || defined(MS_WINDOWS)
#define PYTHONHOMEHELP "<prefix>\\lib"
#else
#define PYTHONHOMEHELP "<prefix>/python1.5"
#endif
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/* Interface to getopt(): */
extern int optind;
extern char *optarg;
extern int getopt(); /* PROTO((int, char **, char *)); -- not standardized */
/* For Py_GetArgcArgv(); set by main() */
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static char **orig_argv;
static int orig_argc;
/* Short usage message (with %s for argv0) */
static char *usage_line =
"usage: %s [option] ... [-c cmd | file | -] [arg] ...\n";
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/* Long usage message, split into parts < 512 bytes */
static char *usage_top = "\
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Options and arguments (and corresponding environment variables):\n\
-d : debug output from parser (also PYTHONDEBUG=x)\n\
-i : inspect interactively after running script, (also PYTHONINSPECT=x)\n\
and force prompts, even if stdin does not appear to be a terminal\n\
-O : optimize generated bytecode (a tad; also PYTHONOPTIMIZE=x)\n\
-OO : remove doc-strings in addition to the -O optimizations\n\
-S : don't imply 'import site' on initialization\n\
-t : issue warnings about inconsistent tab usage (-tt: issue errors)\n\
";
static char *usage_mid = "\
-u : unbuffered binary stdout and stderr (also PYTHONUNBUFFERED=x)\n\
-U : Unicode literals: treats '...' literals like u'...'\n\
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-v : verbose (trace import statements) (also PYTHONVERBOSE=x)\n\
-x : skip first line of source, allowing use of non-Unix forms of #!cmd\n\
-c cmd : program passed in as string (terminates option list)\n\
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file : program read from script file\n\
- : program read from stdin (default; interactive mode if a tty)\n\
";
static char *usage_bot = "\
arg ...: arguments passed to program in sys.argv[1:]\n\
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Other environment variables:\n\
PYTHONSTARTUP: file executed on interactive startup (no default)\n\
PYTHONPATH : '%c'-separated list of directories prefixed to the\n\
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default module search path. The result is sys.path.\n\
PYTHONHOME : alternate <prefix> directory (or <prefix>%c<exec_prefix>).\n\
The default module search path uses %s.\n\
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";
/* Main program */
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DL_EXPORT(int)
Py_Main(argc, argv)
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int argc;
char **argv;
{
int c;
int sts;
char *command = NULL;
char *filename = NULL;
FILE *fp = stdin;
char *p;
int inspect = 0;
int unbuffered = 0;
int skipfirstline = 0;
int stdin_is_interactive = 0;
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orig_argc = argc; /* For Py_GetArgcArgv() */
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orig_argv = argv;
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if ((p = getenv("PYTHONINSPECT")) && *p != '\0')
inspect = 1;
if ((p = getenv("PYTHONUNBUFFERED")) && *p != '\0')
unbuffered = 1;
while ((c = getopt(argc, argv, "c:diOStuUvxX")) != EOF) {
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if (c == 'c') {
/* -c is the last option; following arguments
that look like options are left for the
the command to interpret. */
command = malloc(strlen(optarg) + 2);
if (command == NULL)
Py_FatalError(
"not enough memory to copy -c argument");
strcpy(command, optarg);
strcat(command, "\n");
break;
}
switch (c) {
case 'd':
Py_DebugFlag++;
break;
case 'i':
inspect++;
Py_InteractiveFlag++;
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break;
case 'O':
Py_OptimizeFlag++;
break;
case 'S':
Py_NoSiteFlag++;
break;
case 't':
Py_TabcheckFlag++;
break;
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case 'u':
unbuffered++;
break;
case 'v':
Py_VerboseFlag++;
break;
case 'x':
skipfirstline = 1;
break;
case 'U':
Py_UnicodeFlag++;
break;
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/* This space reserved for other options */
default:
fprintf(stderr, usage_line, argv[0]);
fprintf(stderr, usage_top);
fprintf(stderr, usage_mid);
fprintf(stderr, usage_bot,
DELIM, DELIM, PYTHONHOMEHELP);
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exit(2);
/*NOTREACHED*/
}
}
if (command == NULL && optind < argc &&
strcmp(argv[optind], "-") != 0)
{
filename = argv[optind];
if (filename != NULL) {
if ((fp = fopen(filename, "r")) == NULL) {
fprintf(stderr, "%s: can't open file '%s'\n",
argv[0], filename);
exit(2);
}
else if (skipfirstline) {
int ch;
/* Push back first newline so line numbers
remain the same */
while ((ch = getc(fp)) != EOF) {
if (ch == '\n') {
(void)ungetc(ch, fp);
break;
}
}
}
}
}
stdin_is_interactive = Py_FdIsInteractive(stdin, (char *)0);
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if (unbuffered) {
#ifdef MS_WINDOWS
_setmode(fileno(stdin), O_BINARY);
_setmode(fileno(stdout), O_BINARY);
#endif
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#ifndef MPW
#ifdef HAVE_SETVBUF
setvbuf(stdin, (char *)NULL, _IONBF, BUFSIZ);
setvbuf(stdout, (char *)NULL, _IONBF, BUFSIZ);
setvbuf(stderr, (char *)NULL, _IONBF, BUFSIZ);
#else /* !HAVE_SETVBUF */
setbuf(stdin, (char *)NULL);
setbuf(stdout, (char *)NULL);
setbuf(stderr, (char *)NULL);
#endif /* !HAVE_SETVBUF */
#else /* MPW */
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/* On MPW (3.2) unbuffered seems to hang */
setvbuf(stdin, (char *)NULL, _IOLBF, BUFSIZ);
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setvbuf(stdout, (char *)NULL, _IOLBF, BUFSIZ);
setvbuf(stderr, (char *)NULL, _IOLBF, BUFSIZ);
#endif /* MPW */
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}
else if (Py_InteractiveFlag) {
#ifdef MS_WINDOWS
/* Doesn't have to have line-buffered -- use unbuffered */
/* Any set[v]buf(stdin, ...) screws up Tkinter :-( */
setvbuf(stdout, (char *)NULL, _IONBF, BUFSIZ);
#else /* !MS_WINDOWS */
#ifdef HAVE_SETVBUF
setvbuf(stdin, (char *)NULL, _IOLBF, BUFSIZ);
setvbuf(stdout, (char *)NULL, _IOLBF, BUFSIZ);
#endif /* HAVE_SETVBUF */
#endif /* !MS_WINDOWS */
/* Leave stderr alone - it should be unbuffered anyway. */
}
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Py_SetProgramName(argv[0]);
Py_Initialize();
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if (Py_VerboseFlag ||
(command == NULL && filename == NULL && stdin_is_interactive))
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fprintf(stderr, "Python %s on %s\n%s\n",
Py_GetVersion(), Py_GetPlatform(), Py_GetCopyright());
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if (command != NULL) {
/* Backup optind and force sys.argv[0] = '-c' */
optind--;
argv[optind] = "-c";
}
PySys_SetArgv(argc-optind, argv+optind);
if ((inspect || (command == NULL && filename == NULL)) &&
isatty(fileno(stdin))) {
PyObject *v;
v = PyImport_ImportModule("readline");
if (v == NULL)
PyErr_Clear();
else
Py_DECREF(v);
}
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if (command) {
sts = PyRun_SimpleString(command) != 0;
free(command);
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}
else {
if (filename == NULL && stdin_is_interactive) {
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char *startup = getenv("PYTHONSTARTUP");
if (startup != NULL && startup[0] != '\0') {
FILE *fp = fopen(startup, "r");
if (fp != NULL) {
(void) PyRun_SimpleFile(fp, startup);
PyErr_Clear();
fclose(fp);
}
}
}
sts = PyRun_AnyFile(
fp,
filename == NULL ? "<stdin>" : filename) != 0;
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if (filename != NULL)
fclose(fp);
}
if (inspect && stdin_is_interactive &&
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(filename != NULL || command != NULL))
sts = PyRun_AnyFile(stdin, "<stdin>") != 0;
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Py_Finalize();
return sts;
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}
/* Make the *original* argc/argv available to other modules.
This is rare, but it is needed by the secureware extension. */
void
Py_GetArgcArgv(argc, argv)
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int *argc;
char ***argv;
{
*argc = orig_argc;
*argv = orig_argv;
}