attr_fn_arst.c

openPBS的开放源代码

/*
*         OpenPBS (Portable Batch System) v2.3 Software License
* 
* Copyright (c) 1999-2000 Veridian Information Solutions, Inc.
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* Software to other sites and locations.  Use and redistribution of
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#include <pbs_config.h>   /* the master config generated by configure */

#include <assert.h>
#include <ctype.h>
#include <memory.h>
#ifndef NDEBUG
#include <stdio.h>
#endif
#include <stdlib.h>
#include <string.h>
#include "pbs_ifl.h"
#include "list_link.h"
#include "attribute.h"
#include "pbs_error.h"

static char ident[] = "@(#) $RCSfile: attr_fn_arst.c,v $ $Revision: 2.1.10.4 $";

/*
 * This file contains general function for attributes of type 
 *	array of (pointers to) strings
 *
 * Each set has functions for:
 *	Decoding the value string to the machine representation.
 *	Encoding the internal representation of the attribute to external
 *	Setting the value by =, + or - operators.
 *	Comparing a (decoded) value with the attribute value.
 *	Freeing the space malloc-ed to the attribute value.
 *
 * Some or all of the functions for an attribute type may be shared with
 * other attribute types.
 * 
 * The prototypes are declared in "attribute.h"
 *
 * ----------------------------------------------------------------------------
 * Attribute functions for attributes with value type "array of strings".
 *
 * The "encoded" or external form of the value is a string with the orginial
 * strings separated by commas (or new-lines) and terminated by a null.
 * Any embedded commas or black-slashes must be escaped by a prefixed back-
 * slash.
 *
 * The "decoded" form is a set of strings pointed to by an array_strings struct
 * ----------------------------------------------------------------------------
 */

static int decode_arst_direct(patr, val)
	struct attribute *patr;
	char   		 *val;
{
	unsigned long		 bksize;
	int			 j;
	int			 ns;
	char			*pbuf;
	char			*pc;
	char			*pstr;
	size_t			 ssize;
	struct array_strings	*stp;

	/*
	 * determine number of sub strings, each sub string is terminated
	 * by a non-escaped comma or a new-line, the whole string is terminated
	 * by a null
	 */

	ns = 1;
	ssize = strlen(val) + 1;
	for (pc = val; *pc; pc++) {
		if (*pc == '\\') {
			if (*++pc == '\0')
				break;
		} else if ((*pc == ',') || (*pc == '\n')) {
			++ns;
		}
	}
	pc--;
	if ((*pc == '\n') || ((*pc == ',') && (*(pc-1) != '\\'))) {
		ns--;		/* strip any trailing null string */
		*pc = '\0';
		ssize--;
	}
			
	pbuf  = malloc((unsigned)ssize);
	if (pbuf == (char *)0)
		return (PBSE_SYSTEM);
	bksize = (ns-1) * sizeof (char *) + sizeof (struct array_strings);
	stp = (struct array_strings *)malloc(bksize);
	if (!stp)
		return (PBSE_SYSTEM);
	stp->as_npointers = ns;		/* number of slots (sub strings) */
					/* for the strings themselves */
	stp->as_buf     = pbuf;
	stp->as_next    = pbuf;
	stp->as_bufsize = (unsigned int)ssize;

	/* now copy in substrings and set pointers */
	pc = pbuf;
	j  = 0;
	pstr = parse_comma_string(val);
	while ((pstr != (char *)0) && (j < ns)) {
		stp->as_string[j] = pc;
		while (*pstr) {
			if (*pstr == '\\')
				if (*++pstr == '\0')
					break;
			*pc++ = *pstr++;
		}	
		*pc++ = '\0';
		j++;
		pstr = parse_comma_string((char *)0);
	}
	stp->as_usedptr = j;
	stp->as_next = pc;

	patr->at_flags |= ATR_VFLAG_SET | ATR_VFLAG_MODIFY;
	patr->at_val.at_arst = stp;
	return (0);
}

/*
 * decode_arst - decode a comma string into an attr of type ATR_TYPE_ARST
 *
 *	Returns: 0 if ok,
 *		>0 error number1 if error,
 *		*patr members set
 */

int decode_arst(patr, name, rescn, val)
	struct attribute *patr;
	char *name;		/* attribute name */
	char *rescn;		/* resource name, unused here */
	char *val;		/* attribute value */
{
	int	  rc;
	attribute temp;

	if ((val == (char *)0) || (strlen(val) == 0)) {
	    free_arst(patr);
	    patr->at_flags &= ATR_VFLAG_MODIFY;	/* _SET cleared in free_arst */
	    return (0);
	}

	if ((patr->at_flags & ATR_VFLAG_SET) && (patr->at_val.at_arst)) {
		/* already have values, decode new into temp	*/
		/* then use set(incr) to add new to existing	*/

		
		temp.at_val.at_arst = 0;
		if ((rc = decode_arst_direct(&temp, val)) != 0)
			return (rc);
		rc = set_arst(patr, &temp, INCR);
		free_arst(&temp);
		return (rc);

	} else {
		/* decode directly into real attribute */
		return ( decode_arst_direct(patr, val) );
	}
}

/*
 * encode_arst - encode attr of type ATR_TYPE_ARST into attrlist entry
 *
 * Mode ATR_ENCODE_CLIENT - encode strings into single super string
 *			    separated by ','
 *
 * Mode ATR_ENCODE_SVR    - treated as above
 *
 * Mode ATR_ENCODE_MOM    - treated as above
 *
 * Mode ATR_ENCODE_SAVE - encode strings into single super string
 *			  separated by '\n'
 *
 *	Returns: >0 if ok, entry created and linked into list
 *		 =0 no value to encode, entry not created
 *		 -1 if error
 */
/*ARGSUSED*/

int encode_arst(attr, phead, atname, rsname, mode)
	attribute     *attr;	/* ptr to attribute to encode */
	list_head     *phead;	/* ptr to head of attrlist list */
	char	      *atname;	/* attribute name */
	char	      *rsname;	/* resource name or null */
	int	       mode;	/* encode mode */
{
	char	 *end;
	int	  i;
	int	  j;
	svrattrl *pal;
	char	 *pc;
	char     *pfrom;
	char	  separator;


	if (!attr)
		return (-2);
	if (((attr->at_flags & ATR_VFLAG_SET) == 0) || !attr->at_val.at_arst ||
	     !attr->at_val.at_arst->as_usedptr) 
		return (0);	/* no values */


	i = (int)(attr->at_val.at_arst->as_next - attr->at_val.at_arst->as_buf);
	if (mode == ATR_ENCODE_SAVE) {
		separator = '\n';	/* new-line for encode_acl  */
		/* allow one extra byte for final new-line */
		j = i + 1;
	} else {
		separator = ',';	/* normally a comma is the separator */
		j = i;
	}