/*
* $Id: argproc.c 443 2006-05-30 04:37:13Z darren $
*
* Copyright (c) 1989, Mark Pizzolato ([email protected])
*
* This source code is released for free distribution under the terms of the
* GNU General Public License.
*
* Provided by Stephen P. Wall <[email protected]>
* Extracted from the VMS port of GNU patch-2.1.
*
* This module provides redirection support for the VAX DECC port of
* Exuberant Ctags.
*/
/*
* @(#)argproc.c 1.0 89/02/01 Mark Pizzolato ([email protected])
*/
#ifndef lint
char argproc_version [] = "@(#)argproc.c VMS uucp Version infopiz-1.0";
#endif
#include <ctype.h>
#include <descrip.h>
#include <dvidef.h>
#include <errno.h>
#include <iodef.h>
#include <lib$routines.h>
#include <starlet.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <syidef.h> /* System Information Definitions */
#define EXIT_OK 1 /* image exit code */
#define EXIT_ERR 0x10000000 /* image exit code */
/*
* getredirection() is intended to aid in porting C programs
* to VMS (Vax-11 C) which does not support '>' and '<'
* I/O redirection, along with a command line pipe mechanism
* using the '|' AND background command execution '&'.
* The piping mechanism will probably work with almost any 'filter' type
* of program. With suitable modification, it may useful for other
* portability problems as well.
*
* Author: Mark Pizzolato [email protected]
* Mods: Steve Wall Don't return a full path unless the
* original filename included a path.
*/
struct list_item
{
struct list_item *next;
char *value;
};
static expand_wild_cards ();
static char *pipe_and_fork ();
int
getredirection (ac, av)
int *ac;
char ***av;
/*
* Process vms redirection arg's. Exit if any error is seen.
* If getredirection() processes an argument, it is erased
* from the vector. getredirection () returns a new argc and argv value.
* In the event that a background command is requested (by a trailing "&"),
* this routine creates a background subprocess, and simply exits the program.
*
* Warning: do not try to simplify the code for vms. The code
* presupposes that getredirection() is called before any data is
* read from stdin or written to stdout.
*
* Normal usage is as follows:
*
* main (argc, argv)
* int argc;
* char *argv [];
* {
* getredirection (&argc, &argv);
* }
*/
{
int argc = *ac; /* Argument Count */
char **argv = *av; /* Argument Vector */
char *ap; /* Argument pointer */
int j; /* argv [] index */
extern int errno; /* Last vms i/o error */
int item_count = 0; /* Count of Items in List */
struct list_item *list_head = 0; /* First Item in List */
struct list_item *list_tail; /* Last Item in List */
char *in = NULL; /* Input File Name */
char *out = NULL; /* Output File Name */
char *outmode = "w"; /* Mode to Open Output File */
int cmargc = 0; /* Piped Command Arg Count */
char **cmargv = NULL;/* Piped Command Arg Vector */
/*
* First handle the case where the last thing on the line ends with
* a '&'. This indicates the desire for the command to be run in a
* subprocess, so we satisfy that desire.
*/
{
extern background_process ();
ap = argv [argc-1];
if (0 == strcmp ("&", ap))
exit (background_process (--argc, argv));
if ('&' == ap [strlen (ap)-1])
{
ap [strlen (ap)-1] = '\0';
exit (background_process (argc, argv));
}
}
/*
* Now we handle the general redirection cases that involve '>', '>>',
* '<', and pipes '|'.
*/
for (j = 0; j < argc; ++j)
{
if (0 == strcmp ("<", argv [j]))
{
if (j+1 >= argc)
{
errno = EINVAL;
perror ("No input file");
exit (EXIT_ERR);
}
in = argv [++j];
continue;
}
if ('<' == *(ap = argv [j]))
{
in = 1 + ap;
continue;
}
if (0 == strcmp (">", ap))
{
if (j+1 >= argc)
{
errno = EINVAL;
perror ("No output file");
exit (EXIT_ERR);
}
out = argv [++j];
continue;
}
if ('>' == *ap)
{
if ('>' == ap [1])
{
outmode = "a";
if ('\0' == ap [2])
out = argv [++j];
else
out = 2 + ap;
}
else
out = 1 + ap;
continue;
}
if (0 == strcmp ("|", argv [j]))
{
if (j+1 >= argc)
{
errno = EPIPE;
perror ("No command to Pipe to");
exit (EXIT_ERR);
}
cmargc = argc- (j+1);
cmargv = &argv [j+1];
argc = j;
continue;
}
if ('|' == *(ap = argv [j]))
{
++argv [j];
cmargc = argc-j;
cmargv = &argv [j];
argc = j;
continue;
}
expand_wild_cards (ap, &list_head, &list_tail, &item_count);
}
/*
* Allocate and fill in the new argument vector, Some Unix's terminate
* the list with an extra null pointer.
*/
argv = *av = calloc (item_count+1, sizeof (char *));
for (j = 0; j < item_count; ++j, list_head = list_head->next)
argv [j] = list_head->value;
*ac = item_count;
if (cmargv != NULL)
{
char subcmd [1024];
if (out != NULL)
{
errno = EINVAL;
perror ("Invalid '|' and '>' specified");
exit (EXIT_ERR);
}
strcpy (subcmd, cmargv [0]);
for (j = 1; j < cmargc; ++j)
{
strcat (subcmd, " \"");
strcat (subcmd, cmargv [j]);
strcat (subcmd, "\"");
}
out = pipe_and_fork (subcmd);
}
if ((in != NULL) && (NULL == freopen (in, "r", stdin, "mbc=32", "mbf=2")))
{
perror (in); /* Can't find file */
exit (EXIT_ERR); /* Is a fatal error */
}
if ((out != NULL) && (NULL == freopen (out, outmode, stdout, "mbc=32", "mbf=2")))
{
perror (ap); /* Error, can't write or append */
exit (EXIT_ERR); /* Is a fatal error */
}
#ifdef DEBUG
fprintf (stderr, "Arglist:\n");
for (j = 0; j < *ac; ++j)
fprintf (stderr, "argv[%d] = '%s'\n", j, argv [j]);
#endif
return 0;
}
static add_item (head, tail, value, count)
struct list_item **head;
struct list_item **tail;
char *value;
int *count;
{
if (*head == 0)
{
if (NULL == (*head = calloc (1, sizeof (**head))))
{
errno = ENOMEM;
perror ("");
exit (EXIT_ERR);
}
*tail = *head;
}
else
if (NULL == ((*tail)->next = calloc (1, sizeof (**head))))
{
errno = ENOMEM;
perror ("");
exit (EXIT_ERR);
}
else
*tail = (*tail)->next;
(*tail)->value = value;
++ (*count);
}
static expand_wild_cards (item, head, tail, count)
char *item;
struct list_item **head;
struct list_item **tail;
int *count;
{
int expcount = 0;
int context = 0;
int status;
int status_value;
char *had_version;
int had_path;
$DESCRIPTOR (filespec, item);
/*$DESCRIPTOR (defaultspec, "SYS$DISK:[]*.*;");*/
$DESCRIPTOR (defaultspec, "");
$DESCRIPTOR (resultspec, "");
if (strcspn (item, "*%") == strlen (item))
{
add_item (head, tail, item, count);
return;
}
resultspec.dsc$b_dtype = DSC$K_DTYPE_T;
resultspec.dsc$b_class = DSC$K_CLASS_D;
resultspec.dsc$a_pointer = NULL;
filespec.dsc$w_length = strlen (item);
/*
* Only return version specs, if the caller specified a version
*/
had_version = strchr (item, ';');
/*
* Only return full path if the caller specified a path
*/
had_path = (strchr (item, ']') || strchr (item, ':'));
while (1 == (1&lib$find_file (&filespec, &resultspec, &context,
&defaultspec, 0, &status_value, &0)))
{
char *string;
char *c;
if (NULL == (string = calloc (1, resultspec.dsc$w_length+1)))
{
errno = ENOMEM;
perror ("");
exit (EXIT_ERR);
}
strncpy (string, resultspec.dsc$a_pointer, resultspec.dsc$w_length);
string [resultspec.dsc$w_length] = '\0';
if (NULL == had_version)
*((char *) strrchr (string, ';')) = '\0';
if (!had_path) {
char *s = strrchr (string, ']');
if ( s == NULL ) s = strrchr (string, ':');
if ( s != NULL ) strcpy (string, s+1);
}
/*
* Be consistent with what the C RTL has already done to the rest of
* the argv items and lowercase all of these names.
*/
for (c = string; *c; ++c)
if (isupper (*c))
*c = tolower (*c);
add_item (head, tail, string, count);
++expcount;
}
if (expcount == 0)
add_item (head, tail, item, count);
lib$sfree1_dd (&resultspec);
lib$find_file_end (&context);
}
static int child_st [2]; /* Event Flag set when child process completes */
static short child_chan;/* I/O Channel for Pipe Mailbox */
static exit_handler (status)
int *status;
{
short iosb [4];
if (0 == child_st [0])
{
#ifdef DEBUG
fprintf (stderr, "Waiting for Child Process to Finnish . . .\n");
#endif
sys$qiow (0, child_chan, IO$_WRITEOF, iosb, 0, 0, 0, 0, 0, 0, 0, 0);
sys$dassgn (child_chan);
fclose (stdout);
sys$synch (0, child_st);
}
}
static sig_child (chan)
int chan;
{
#ifdef DEBUG
fprintf (stderr, "Child Completion AST\n");
#endif
if (child_st [0] == 0)
child_st [0] = 1;
}
static struct exit_control_block
{
struct exit_control_block *flink;
int (*exit_routine) ();
int arg_count;
int *status_address;
int exit_status;
} exit_block =
{
0,
exit_handler,
1,
&exit_block.exit_status,
0
};
static char *pipe_and_fork (cmd)
char *cmd;
{
$DESCRIPTOR (cmddsc, cmd);
static char mbxname [64];
$DESCRIPTOR (mbxdsc, mbxname);
short iosb [4];
int status;
int pid;
struct
{
short dna_buflen;
short dna_itmcod;
char *dna_buffer;
unsigned short *dna_retlen;
int listend;
} itmlst =
{
sizeof (mbxname),
DVI$_DEVNAM,
mbxname,
&mbxdsc.dsc$w_length,
0
};
int mbxsize;
struct
{
short mbf_buflen;
short mbf_itmcod;
int *mbf_maxbuf;
unsigned short *mbf_retlen;
int listend;
} syiitmlst =
{
sizeof (mbxsize),
SYI$_MAXBUF,
&mbxsize,
0,
0
};
cmddsc.dsc$w_length = strlen (cmd);
/*
* Get the SYSGEN parameter MAXBUF, and the smaller of it and 2048 as
* the size of the 'pipe' mailbox.
*/
if (1 == (1& (vaxc$errno = sys$getsyiw (0, 0, 0, &syiitmlst, iosb, 0, 0, 0))))
vaxc$errno = iosb [0];
if (0 == (1&vaxc$errno))
{
errno = EVMSERR;
perror ("Can't get SYSGEN parameter value for MAXBUF");
exit (EXIT_ERR);
}
if (mbxsize > 2048)
mbxsize = 2048;
if (0 == (1& (vaxc$errno = sys$crembx (0, &child_chan, mbxsize, mbxsize, 0, 0, 0))))
{
errno = EVMSERR;
perror ("Can't create pipe mailbox");
exit (EXIT_ERR);
}
if (1 == (1& (vaxc$errno = sys$getdviw (0, child_chan, 0, &itmlst, iosb,
0, 0, 0))))
vaxc$errno = iosb [0];
if (0 == (1&vaxc$errno))
{
errno = EVMSERR;
perror ("Can't get pipe mailbox device name");
exit (EXIT_ERR);
}
mbxname [mbxdsc.dsc$w_length] = '\0';
#ifdef DEBUG
fprintf (stderr, "Pipe Mailbox Name = '%s'\n", mbxname);
#endif
if (0 == (1& (vaxc$errno = lib$spawn (&cmddsc, &mbxdsc, 0, &1,
0, &pid, child_st, &0, sig_child,
&child_chan))))
{
errno = EVMSERR;
perror ("Can't spawn subprocess");
exit (EXIT_ERR);
}
#ifdef DEBUG
fprintf (stderr, "Subprocess's Pid = %08X\n", pid);
#endif
sys$dclexh (&exit_block);
return (mbxname);
}
background_process (argc, argv)
int argc;
char **argv;
{
char command [2048] = "$";
$DESCRIPTOR (value, command);
$DESCRIPTOR (cmd, "BACKGROUND$COMMAND");
$DESCRIPTOR (null, "NLA0:");
int pid;
strcat (command, argv [0]);
while (--argc)
{
strcat (command, " \"");
strcat (command, *(++argv));
strcat (command, "\"");
}
value.dsc$w_length = strlen (command);
if (0 == (1& (vaxc$errno = lib$set_symbol (&cmd, &value))))
{
errno = EVMSERR;
perror ("Can't create symbol for subprocess command");
exit (EXIT_ERR);
}
if (0 == (1& (vaxc$errno = lib$spawn (&cmd, &null, 0, &17, 0, &pid))))
{
errno = EVMSERR;
perror ("Can't spawn subprocess");
exit (EXIT_ERR);
}
#ifdef DEBUG
fprintf (stderr, "%s\n", command);
#endif
fprintf (stderr, "%08X\n", pid);
return (EXIT_OK);
}
/* vi:set tabstop=4 shiftwidth=4: */
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