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os_shell.c
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os_shell.c
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/* File: "os_shell.c", Time-stamp: <2009-03-14 09:15:57 feeley> */
/* Copyright (c) 1994-2009 by Marc Feeley, All Rights Reserved. */
/*
* This module implements the operating system specific routines
* related to the shell.
*/
#define ___INCLUDED_FROM_OS_SHELL
#define ___VERSION 406005
#include "gambit.h"
#include "os_base.h"
#include "os_shell.h"
#include "os_files.h"
/*---------------------------------------------------------------------------*/
___shell_module ___shell_mod =
{
0
#ifdef ___SHELL_MODULE_INIT
___SHELL_MODULE_INIT
#endif
};
/*---------------------------------------------------------------------------*/
/* Access to shell environment variables. */
/****************** obsolete.... use ___getenv_UCS_2 */
char *___getenv
___P((char *name),
(name)
char *name;)
{
return getenv (name);
}
#define GETENV_NAME_STATIC_SIZE 128
#define GETENV_VALUE_STATIC_SIZE 128
#define SETENV_NAME_STATIC_SIZE 128
#define SETENV_VALUE_STATIC_SIZE 128
#define UNSETENV_NAME_STATIC_SIZE 128
___SCMOBJ ___getenv_UCS_2
___P((___UCS_2STRING name,
___UCS_2STRING *value),
(name,
value)
___UCS_2STRING name;
___UCS_2STRING *value;)
{
___SCMOBJ e;
___UCS_2STRING v;
___UCS_2STRING p1;
int name_len;
/* reject strings that contain "=" except as the first character */
p1 = name;
if (*p1 == '=')
p1++;
while (*p1 != '\0')
{
#if ENV_CHAR_BYTES == 1
if (*p1 > 255)
return ___FIX(___IMPL_LIMIT_ERR);
#endif
if (*p1++ == '=')
return ___FIX(___IMPL_LIMIT_ERR);
}
name_len = p1 - name;
/* find in the environment a string of the form name=value */
e = ___FIX(___NO_ERR);
*value = 0;
#ifdef USE_environ
{
char **probe;
char *p2;
probe = environ;
while ((p2 = *probe++) != 0)
{
p1 = name;
while (*p1 != '\0' &&
*p1 == ___CAST(___UCS_2,___CAST(unsigned char,*p2)))
{
p1++;
p2++;
}
if (*p1 == '\0' && *p2 == '=')
{
int len = 0;
p2++;
while (p2[len] != '\0')
len++;
v = ___CAST(___UCS_2STRING,
___alloc_mem (sizeof (___UCS_2) * (len+1)));
if (v == 0)
return ___FIX(___HEAP_OVERFLOW_ERR);
do
{
v[len] = ___CAST(___UCS_2,___CAST(unsigned char,p2[len]));
} while (len-- > 0);
*value = v;
}
}
}
#else
{
#if ENV_CHAR_BYTES == 1
char *cvalue_ptr = 0;
char cname[GETENV_NAME_STATIC_SIZE];
char *cname_ptr = cname;
if (name_len >= GETENV_NAME_STATIC_SIZE)
{
cname_ptr = ___CAST(char*,
___alloc_mem (sizeof (*cname_ptr)
* (name_len+1)));
if (cname_ptr == 0)
return ___FIX(___HEAP_OVERFLOW_ERR);
}
do
{
cname_ptr[name_len] = name[name_len];
} while (name_len-- > 0);
#else
___UCS_2 *cvalue_ptr = 0;
___UCS_2 *cname_ptr = name;
#endif
#ifndef USE_getenv
#ifndef USE_GetEnvironmentVariable
if (cvalue_ptr != 0)
#endif
#endif
#ifdef USE_getenv
cvalue_ptr = getenv (cname_ptr);
if (cvalue_ptr != 0)
#endif
#ifdef USE_GetEnvironmentVariable
{
___CHAR_TYPE(___GETENV_CE_SELECT) cvalue[GETENV_VALUE_STATIC_SIZE];
int n;
cvalue_ptr = cvalue;
n = GetEnvironmentVariable
(cname_ptr,
cvalue_ptr,
GETENV_VALUE_STATIC_SIZE);
if (n >= GETENV_VALUE_STATIC_SIZE)
{
cvalue_ptr = ___CAST(___CHAR_TYPE(___GETENV_CE_SELECT)*,
___alloc_mem (sizeof (*cvalue_ptr) * n));
if (cvalue_ptr != 0)
n = GetEnvironmentVariable
(cname_ptr,
cvalue_ptr,
n);
}
if (cvalue_ptr == 0)
e = ___FIX(___HEAP_OVERFLOW_ERR);
else if (n > 0)
#endif
{
___UCS_2STRING v;
int len = 0;
while (cvalue_ptr[len] != '\0')
len++;
v = ___CAST(___UCS_2STRING,
___alloc_mem (sizeof (___UCS_2) * (len+1)));
if (v == 0)
e = ___FIX(___HEAP_OVERFLOW_ERR);
else
{
do
{
v[len] = ___CAST(___UCS_2,cvalue_ptr[len]);
} while (len-- > 0);
*value = v;
}
}
#ifdef USE_GetEnvironmentVariable
if (cvalue_ptr != cvalue)
___free_mem (cvalue_ptr);
}
#endif
#if ENV_CHAR_BYTES == 1
if (cname_ptr != cname)
___free_mem (cname_ptr);
#endif
}
#endif
return e;
}
___SCMOBJ ___setenv_UCS_2
___P((___UCS_2STRING name,
___UCS_2STRING value),
(name,
value)
___UCS_2STRING name;
___UCS_2STRING value;)
{
___SCMOBJ e;
___UCS_2STRING p1;
int name_len;
int value_len;
/* reject strings that contain "=" except as the first character */
p1 = name;
if (*p1 == '=')
p1++;
while (*p1 != '\0')
{
#if ENV_CHAR_BYTES == 1
if (*p1 > 255)
return ___FIX(___IMPL_LIMIT_ERR);
#endif
if (*p1++ == '=')
return ___FIX(___IMPL_LIMIT_ERR);
}
name_len = p1 - name;
p1 = value;
while (*p1 != '\0')
{
#if ENV_CHAR_BYTES == 1
if (*p1 > 255)
return ___FIX(___IMPL_LIMIT_ERR);
#endif
p1++;
}
value_len = p1 - value;
/* find in the environment a string of the form name=value */
e = ___FIX(___NO_ERR);
#ifdef USE_environ
{
char **old_environ = environ;
char **probe;
char *p2;
char *name_value = ___CAST(char*,
___alloc_mem (name_len + value_len + 2));
if (name_value == 0)
return ___FIX(___HEAP_OVERFLOW_ERR);
p2 = name_value;
p1 = name;
while (name_len > 0)
{
*p2++ = ___CAST(char,*p1++);
name_len--;
}
*p2++ = '=';
p1 = value;
while (value_len > 0)
{
*p2++ = ___CAST(char,*p1++);
value_len--;
}
*p2++ = '\0';
probe = old_environ;
while ((p2 = *probe++) != 0)
{
p1 = name;
while (*p1 != '\0' &&
*p1 == ___CAST(___UCS_2,___CAST(unsigned char,*p2)))
{
p1++;
p2++;
}
if (*p1 == '\0' && *p2 == '=')
{
probe[-1] = name_value;
return ___FIX(___NO_ERR);
}
}
if (___shell_mod.environ_unused_at_end > 0)
{
probe[-1] = name_value;
probe[0] = 0;
___shell_mod.environ_unused_at_end--;
return ___FIX(___NO_ERR);
}
else
{
char **new_environ;
int n = probe - old_environ; /* length including null pointer at end */
___shell_mod.environ_unused_at_end = n/2 + 1;
new_environ =
___CAST(char**,
___alloc_mem ((n + ___shell_mod.environ_unused_at_end)
* sizeof (char*)));
if (new_environ == 0)
{
___free_mem (name_value);
return ___FIX(___HEAP_OVERFLOW_ERR);
}
environ = new_environ;
probe = old_environ;
while (--n > 0)
*new_environ++ = *probe++;
*new_environ++ = name_value;
*new_environ++ = 0;
___shell_mod.environ_unused_at_end--;
if (___shell_mod.environ_was_extended)
___free_mem (old_environ);
___shell_mod.environ_was_extended = 1;
}
}
#else
{
#if ENV_CHAR_BYTES == 1
char *cname_ptr;
char *cvalue_ptr;
char cname[SETENV_NAME_STATIC_SIZE];
char cvalue[SETENV_VALUE_STATIC_SIZE];
if (name_len < SETENV_NAME_STATIC_SIZE)
cname_ptr = cname;
else
{
cname_ptr = ___CAST(char*,
___alloc_mem (sizeof (*cname_ptr)
* (name_len+1)));
if (cname_ptr == 0)
return ___FIX(___HEAP_OVERFLOW_ERR);
}
do
{
cname_ptr[name_len] = name[name_len];
} while (name_len-- > 0);
if (value_len < SETENV_VALUE_STATIC_SIZE)
cvalue_ptr = cvalue;
else
{
cvalue_ptr = ___CAST(char*,
___alloc_mem (sizeof (*cvalue_ptr)
* (value_len+1)));
if (cvalue_ptr == 0)
{
if (cname_ptr != cname)
___free_mem (cname_ptr);
return ___FIX(___HEAP_OVERFLOW_ERR);
}
}
do
{
cvalue_ptr[value_len] = value[value_len];
} while (value_len-- > 0);
#else
___UCS_2 *cname_ptr = name;
___UCS_2 *cvalue_ptr = value;
#endif
#ifdef USE_setenv
if (setenv (cname_ptr, cvalue_ptr, 1) < 0)
e = err_code_from_errno ();
#endif
#ifdef USE_SetEnvironmentVariable
if (!SetEnvironmentVariable (cname_ptr, cvalue_ptr))
e = err_code_from_GetLastError ();
#endif
#if ENV_CHAR_BYTES == 1
if (cvalue_ptr != cvalue)
___free_mem (cvalue_ptr);
if (cname_ptr != cname)
___free_mem (cname_ptr);
#endif
}
#endif
return e;
}
___SCMOBJ ___unsetenv_UCS_2
___P((___UCS_2STRING name),
(name)
___UCS_2STRING name;)
{
___SCMOBJ e;
___UCS_2STRING p1;
int name_len;
/* reject strings that contain "=" except as the first character */
p1 = name;
if (*p1 == '=')
p1++;
while (*p1 != '\0')
{
#if ENV_CHAR_BYTES == 1
if (*p1 > 255)
return ___FIX(___IMPL_LIMIT_ERR);
#endif
if (*p1++ == '=')
return ___FIX(___IMPL_LIMIT_ERR);
}
name_len = p1 - name;
/* find in the environment a string of the form name=value */
e = ___FIX(___NO_ERR);
#ifdef USE_environ
{
char **probe;
char *p2;
probe = environ;
while ((p2 = *probe++) != 0)
{
p1 = name;
while (*p1 != '\0' &&
*p1 == ___CAST(___UCS_2,___CAST(unsigned char,*p2)))
{
p1++;
p2++;
}
if (*p1 == '\0' && *p2 == '=')
{
___shell_mod.environ_unused_at_end++;
while ((probe[-1] = probe[0]) != 0)
probe++;
return ___FIX(___NO_ERR);
}
}
}
#else
{
#if ENV_CHAR_BYTES == 1
char *cname_ptr;
char cname[UNSETENV_NAME_STATIC_SIZE];
if (name_len < UNSETENV_NAME_STATIC_SIZE)
cname_ptr = cname;
else
{
cname_ptr = ___CAST(char*,
___alloc_mem (sizeof (*cname_ptr)
* (name_len+1)));
if (cname_ptr == 0)
return ___FIX(___HEAP_OVERFLOW_ERR);
}
do
{
cname_ptr[name_len] = name[name_len];
} while (name_len-- > 0);
#else
___UCS_2 *cname_ptr = name;
#endif
#ifdef USE_unsetenv
if (unsetenv (cname_ptr) < 0)
e = err_code_from_errno ();
#endif
#ifdef USE_SetEnvironmentVariable
if (!SetEnvironmentVariable (cname_ptr, 0))
{
e = err_code_from_GetLastError ();
/*
* Apparently an error is signaled if the environment
* variable being removed does not exist (the Microsoft
* documentation does not mention this).
*/
if (e == ___FIX(___WIN32_ERR(ERROR_ENVVAR_NOT_FOUND)))
e = ___FIX(___NO_ERR);
}
#endif
#if ENV_CHAR_BYTES == 1
if (cname_ptr != cname)
___free_mem (cname_ptr);
#endif
}
#endif
return e;
}
___SCMOBJ ___os_getenv
___P((___SCMOBJ name),
(name)
___SCMOBJ name;)
{
___SCMOBJ e;
___SCMOBJ result;
___UCS_2STRING cname;
___UCS_2STRING cvalue;
if ((e = ___SCMOBJ_to_NONNULLUCS_2STRING
(name,
&cname,
1))
!= ___FIX(___NO_ERR))
result = e;
else
{
if ((e = ___getenv_UCS_2 (cname, &cvalue)) != ___FIX(___NO_ERR))
result = e;
else
{
if ((e = ___UCS_2STRING_to_SCMOBJ
(cvalue,
&result,
___RETURN_POS))
!= ___FIX(___NO_ERR))
result = e;
else
___release_scmobj (result);
if (cvalue != 0)
___free_mem (cvalue);
}
___release_string (cname);
}
return result;
}
___SCMOBJ ___os_setenv
___P((___SCMOBJ name,
___SCMOBJ value),
(name,
value)
___SCMOBJ name;
___SCMOBJ value;)
{
___SCMOBJ e;
___UCS_2STRING cname;
___UCS_2STRING cvalue;
if ((e = ___SCMOBJ_to_NONNULLUCS_2STRING
(name,
&cname,
1))
== ___FIX(___NO_ERR))
{
if (value == ___ABSENT)
e = ___unsetenv_UCS_2 (cname);
else if ((e = ___SCMOBJ_to_NONNULLUCS_2STRING
(value,
&cvalue,
2))
== ___FIX(___NO_ERR))
{
e = ___setenv_UCS_2 (cname, cvalue);
___release_string (cvalue);
}
___release_string (cname);
}
return e;
}
___SCMOBJ ___os_environ ___PVOID
{
___SCMOBJ e;
___SCMOBJ result;
#ifndef USE_environ
#ifndef USE_GetEnvironmentStrings
result = ___NUL;
#endif
#endif
#ifdef USE_environ
if ((e = ___NONNULLCHARSTRINGLIST_to_SCMOBJ
(environ,
&result,
___RETURN_POS))
!= ___FIX(___NO_ERR))
result = e;
else
___release_scmobj (result);
#endif
#ifdef USE_GetEnvironmentStrings
___STRING_TYPE(___ENVIRON_CE_SELECT) env;
___STRING_TYPE(___ENVIRON_CE_SELECT) ptr;
___SCMOBJ pair;
___SCMOBJ str;
e = ___FIX(___NO_ERR);
result = ___NUL;
env = GetEnvironmentStrings ();
if (env != 0 && *env != 0)
{
ptr = env;
/* find end of environment strings. */
do
{
do { ptr++; } while (*ptr != 0);
ptr++; /* skip null char at end of string */
} while (*ptr != 0);
while (ptr > env)
{
ptr--; /* move ptr to terminating null char of previous string */
while (ptr > env && ptr[-1] != 0)
ptr--;
if ((e = ___NONNULLSTRING_to_SCMOBJ
(ptr,
&str,
___RETURN_POS,
___CE(___ENVIRON_CE_SELECT)))
!= ___FIX(___NO_ERR))
break;
pair = ___make_pair (str, result, ___STILL);
___release_scmobj (str);
___release_scmobj (result);
if (___FIXNUMP(pair))
{
e = ___FIX(___CTOS_HEAP_OVERFLOW_ERR+___RETURN_POS);
break;
}
result = pair;
}
___release_scmobj (result);
}
if (env != 0)
if (!FreeEnvironmentStrings (env))
e = err_code_from_GetLastError ();
if (e != ___FIX(___NO_ERR))
result = e;
#endif
return result;
}
/*---------------------------------------------------------------------------*/
/* Shell command. */
___SCMOBJ ___os_shell_command
___P((___SCMOBJ cmd,
___SCMOBJ dir),
(cmd,
dir)
___SCMOBJ cmd;
___SCMOBJ dir;)
{
___SCMOBJ e;
#ifndef USE_POSIX
#ifndef USE_WIN32
e = ___FIX(___UNIMPL_ERR);
#endif
#endif
#ifdef USE_POSIX
char *ccmd;
if ((e = ___SCMOBJ_to_NONNULLCHARSTRING
(cmd,
&ccmd,
1))
== ___FIX(___NO_ERR))
{
void *cdir;
if ((e = ___SCMOBJ_to_NONNULLSTRING
(dir,
&cdir,
2,
___CE(___PATH_CE_SELECT),
0))
== ___FIX(___NO_ERR))
{
int code;
___CHAR_TYPE(___PATH_CE_SELECT) old_dir[___PATH_MAX_LENGTH+1];
if (getcwd (old_dir, ___PATH_MAX_LENGTH) == 0)
e = err_code_from_errno ();
else
{
if (chdir (___CAST(___STRING_TYPE(___PATH_CE_SELECT),cdir)) < 0)
e = err_code_from_errno ();
else
{
___disable_os_interrupts ();
code = system (ccmd);
if (code == -1)
e = err_code_from_errno ();
else
e = ___FIX(code & ___MAX_FIX);
___enable_os_interrupts ();
chdir (old_dir); /* ignore error */
}
}
___release_string (cdir);
}
___release_string (ccmd);
}
#endif
#ifdef USE_WIN32
#ifdef _UNICODE
#define ___SHELL_COMMAND_CE_SELECT(latin1,utf8,ucs2,ucs4,wchar,native) ucs2
#else
#define ___SHELL_COMMAND_CE_SELECT(latin1,utf8,ucs2,ucs4,wchar,native) native
#endif
void *ccmd;
if ((e = ___SCMOBJ_to_NONNULLSTRING
(cmd,
&ccmd,
1,
___CE(___SHELL_COMMAND_CE_SELECT),
0))
== ___FIX(___NO_ERR))
{
void *cdir;
if ((e = ___SCMOBJ_to_STRING
(dir,
&cdir,
2,
___CE(___PATH_CE_SELECT),
0))
== ___FIX(___NO_ERR))
{
DWORD n;
___CHAR_TYPE(___PATH_CE_SELECT) old_dir[___PATH_MAX_LENGTH+1];
n = GetCurrentDirectory (___PATH_MAX_LENGTH+1,
old_dir);
if (n < 1 || n > ___PATH_MAX_LENGTH)
e = err_code_from_GetLastError ();
else
{
if (!SetCurrentDirectory (___CAST(___STRING_TYPE(___PATH_CE_SELECT),cdir)))
e = err_code_from_GetLastError ();
else
{
#ifdef ___DO_NOT_USE_system
/*
* This code does not really cause the shell to run
* the command. This means that the shell builtin
* commands (such as "DIR" cannot be executed. It
* is better to use "system" and "_wsystem".
*/
DWORD code;
STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory (&si, sizeof (si));
si.cb = sizeof (si);
ZeroMemory (&pi, sizeof (pi));
if (!CreateProcess
(NULL, /* module name */
___CAST(___STRING_TYPE(___SHELL_COMMAND_CE_SELECT),ccmd),
NULL, /* process handle not inheritable */
NULL, /* thread handle not inheritable */
FALSE, /* set handle inheritance to FALSE */
0, /* no creation flags */
NULL, /* use parent's environment block */
NULL, /* use parent's starting directory */
&si, /* pointer to STARTUPINFO structure */
&pi)) /* pointer to PROCESS_INFORMATION structure */
e = err_code_from_GetLastError ();
else
{
if (WaitForSingleObject (pi.hProcess, INFINITE) == WAIT_FAILED ||
!GetExitCodeProcess (pi.hProcess, &code))
e = err_code_from_GetLastError ();
else
e = ___FIX(code & ___MAX_FIX);
CloseHandle (pi.hProcess); /* ignore error */
CloseHandle (pi.hThread); /* ignore error */
}
#else
int code;
#ifdef _UNICODE
code = _wsystem (___CAST(___STRING_TYPE(___SHELL_COMMAND_CE_SELECT),ccmd));
#else
code = system (___CAST(___STRING_TYPE(___SHELL_COMMAND_CE_SELECT),ccmd));
#endif
if (code == -1)
e = err_code_from_errno ();
else
e = ___FIX(code & ___MAX_FIX);
#endif
SetCurrentDirectory (old_dir); /* ignore error */
}
}
___release_string (cdir);
}
___release_string (ccmd);
}
#endif
return e;
}
/*---------------------------------------------------------------------------*/
/* Shell module initialization/finalization. */
___SCMOBJ ___setup_shell_module ___PVOID