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cpython/Modules/main.c

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/* Python interpreter main program */
#include "Python.h"
#include "osdefs.h"
#include "compile.h" /* For CO_FUTURE_DIVISION */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef MS_WINDOWS
#include <fcntl.h>
#endif
#if defined(PYOS_OS2) || defined(MS_WINDOWS)
#define PYTHONHOMEHELP "<prefix>\\lib"
#else
#define PYTHONHOMEHELP "<prefix>/pythonX.X"
#endif
#include "pygetopt.h"
#define COPYRIGHT \
"Type \"help\", \"copyright\", \"credits\" or \"license\" " \
"for more information."
/* For Py_GetArgcArgv(); set by main() */
static char **orig_argv;
static int orig_argc;
/* command line options */
#define BASE_OPTS "c:dEhiOQ:StuUvVW:xX"
#ifndef RISCOS
#define PROGRAM_OPTS BASE_OPTS
#else /*RISCOS*/
/* extra option saying that we are running under a special task window
frontend; especially my_readline will behave different */
#define PROGRAM_OPTS BASE_OPTS "w"
/* corresponding flag */
extern int Py_RISCOSWimpFlag;
#endif /*RISCOS*/
/* Short usage message (with %s for argv0) */
static char *usage_line =
"usage: %s [option] ... [-c cmd | file | -] [arg] ...\n";
/* Long usage message, split into parts < 512 bytes */
static char *usage_1 = "\
Options and arguments (and corresponding environment variables):\n\
-c cmd : program passed in as string (terminates option list)\n\
-d : debug output from parser (also PYTHONDEBUG=x)\n\
-E : ignore environment variables (such as PYTHONPATH)\n\
-h : print this help message and exit\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\
";
static char *usage_2 = "\
-O : optimize generated bytecode (a tad; also PYTHONOPTIMIZE=x)\n\
-OO : remove doc-strings in addition to the -O optimizations\n\
-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew\n\
-S : don't imply 'import site' on initialization\n\
-t : issue warnings about inconsistent tab usage (-tt: issue errors)\n\
-u : unbuffered binary stdout and stderr (also PYTHONUNBUFFERED=x)\n\
";
static char *usage_3 = "\
-U : Unicode literals: treats '...' literals like u'...'\n\
-v : verbose (trace import statements) (also PYTHONVERBOSE=x)\n\
-V : print the Python version number and exit\n\
-W arg : warning control (arg is action:message:category:module:lineno)\n\
-x : skip first line of source, allowing use of non-Unix forms of #!cmd\n\
file : program read from script file\n\
- : program read from stdin (default; interactive mode if a tty)\n\
";
static char *usage_4 = "\
arg ...: arguments passed to program in sys.argv[1:]\n\
Other environment variables:\n\
PYTHONSTARTUP: file executed on interactive startup (no default)\n\
PYTHONPATH : '%c'-separated list of directories prefixed to the\n\
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\
PYTHONCASEOK : ignore case in 'import' statements (Windows).\n\
";
static void
usage(int exitcode, char* program)
{
FILE *f = exitcode ? stderr : stdout;
fprintf(f, usage_line, program);
if (exitcode)
fprintf(f, "Try `python -h' for more information.\n");
else {
fprintf(f, usage_1);
fprintf(f, usage_2);
fprintf(f, usage_3);
fprintf(f, usage_4, DELIM, DELIM, PYTHONHOMEHELP);
}
exit(exitcode);
/*NOTREACHED*/
}
/* Main program */
DL_EXPORT(int)
Py_Main(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;
int help = 0;
int version = 0;
int saw_inspect_flag = 0;
int saw_unbuffered_flag = 0;
PyCompilerFlags cf;
cf.cf_flags = 0;
orig_argc = argc; /* For Py_GetArgcArgv() */
orig_argv = argv;
#ifdef RISCOS
Py_RISCOSWimpFlag = 0;
#endif
PySys_ResetWarnOptions();
while ((c = _PyOS_GetOpt(argc, argv, PROGRAM_OPTS)) != EOF) {
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(_PyOS_optarg) + 2);
if (command == NULL)
Py_FatalError(
"not enough memory to copy -c argument");
strcpy(command, _PyOS_optarg);
strcat(command, "\n");
break;
}
switch (c) {
case 'd':
Py_DebugFlag++;
break;
case 'Q':
if (strcmp(_PyOS_optarg, "old") == 0) {
Py_DivisionWarningFlag = 0;
break;
}
if (strcmp(_PyOS_optarg, "warn") == 0) {
Py_DivisionWarningFlag = 1;
break;
}
if (strcmp(_PyOS_optarg, "warnall") == 0) {
Py_DivisionWarningFlag = 2;
break;
}
if (strcmp(_PyOS_optarg, "new") == 0) {
/* XXX This only affects __main__ */
cf.cf_flags |= CO_FUTURE_DIVISION;
break;
}
fprintf(stderr,
"-Q option should be `-Qold', "
"`-Qwarn', `-Qwarnall', or `-Qnew' only\n");
usage(2, argv[0]);
/* NOTREACHED */
case 'i':
inspect++;
saw_inspect_flag = 1;
Py_InteractiveFlag++;
break;
case 'O':
Py_OptimizeFlag++;
break;
case 'S':
Py_NoSiteFlag++;
break;
case 'E':
Py_IgnoreEnvironmentFlag++;
break;
case 't':
Py_TabcheckFlag++;
break;
case 'u':
unbuffered++;
saw_unbuffered_flag = 1;
break;
case 'v':
Py_VerboseFlag++;
break;
#ifdef RISCOS
case 'w':
Py_RISCOSWimpFlag = 1;
break;
#endif
case 'x':
skipfirstline = 1;
break;
case 'U':
Py_UnicodeFlag++;
break;
case 'h':
help++;
break;
case 'V':
version++;
break;
case 'W':
PySys_AddWarnOption(_PyOS_optarg);
break;
/* This space reserved for other options */
default:
usage(2, argv[0]);
/*NOTREACHED*/
}
}
if (help)
usage(0, argv[0]);
if (version) {
fprintf(stderr, "Python %s\n", PY_VERSION);
exit(0);
}
if (!saw_inspect_flag &&
(p = Py_GETENV("PYTHONINSPECT")) && *p != '\0')
inspect = 1;
if (!saw_unbuffered_flag &&
(p = Py_GETENV("PYTHONUNBUFFERED")) && *p != '\0')
unbuffered = 1;
if (command == NULL && _PyOS_optind < argc &&
strcmp(argv[_PyOS_optind], "-") != 0)
{
filename = argv[_PyOS_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);
if (unbuffered) {
#ifdef MS_WINDOWS
_setmode(fileno(stdin), O_BINARY);
_setmode(fileno(stdout), O_BINARY);
#endif
#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 */
/* On MPW (3.2) unbuffered seems to hang */
setvbuf(stdin, (char *)NULL, _IOLBF, BUFSIZ);
setvbuf(stdout, (char *)NULL, _IOLBF, BUFSIZ);
setvbuf(stderr, (char *)NULL, _IOLBF, BUFSIZ);
#endif /* MPW */
}
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. */
}
Py_SetProgramName(argv[0]);
Py_Initialize();
if (Py_VerboseFlag ||
(command == NULL && filename == NULL && stdin_is_interactive))
fprintf(stderr, "Python %s on %s\n%s\n",
Py_GetVersion(), Py_GetPlatform(), COPYRIGHT);
if (command != NULL) {
/* Backup _PyOS_optind and force sys.argv[0] = '-c' */
_PyOS_optind--;
argv[_PyOS_optind] = "-c";
}
PySys_SetArgv(argc-_PyOS_optind, argv+_PyOS_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);
}
if (command) {
sts = PyRun_SimpleStringFlags(command, &cf) != 0;
free(command);
}
else {
if (filename == NULL && stdin_is_interactive) {
char *startup = Py_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);
}
}
}
/* XXX */
sts = PyRun_AnyFileExFlags(
fp,
filename == NULL ? "<stdin>" : filename,
filename != NULL, &cf) != 0;
}
if (inspect && stdin_is_interactive &&
(filename != NULL || command != NULL))
/* XXX */
sts = PyRun_AnyFileFlags(stdin, "<stdin>", &cf) != 0;
Py_Finalize();
#ifdef RISCOS
if(Py_RISCOSWimpFlag)
fprintf(stderr, "\x0cq\x0c"); /* make frontend quit */
#endif
#ifdef __INSURE__
/* Insure++ is a memory analysis tool that aids in discovering
* memory leaks and other memory problems. On Python exit, the
* interned string dictionary is flagged as being in use at exit
* (which it is). Under normal circumstances, this is fine because
* the memory will be automatically reclaimed by the system. Under
* memory debugging, it's a huge source of useless noise, so we
* trade off slower shutdown for less distraction in the memory
* reports. -baw
*/
_Py_ReleaseInternedStrings();
#endif /* __INSURE__ */
return sts;
}
/* Make the *original* argc/argv available to other modules.
This is rare, but it is needed by the secureware extension. */
void
Py_GetArgcArgv(int *argc, char ***argv)
{
*argc = orig_argc;
*argv = orig_argv;
}
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