attr_fn_str.c

openPBS的开放源代码

/*
*         OpenPBS (Portable Batch System) v2.3 Software License
* 
* Copyright (c) 1999-2000 Veridian Information Solutions, Inc.
* All rights reserved.
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* please contact Veridian Systems, PBS Products Department ("Licensor") at:
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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_str.c,v $ $Revision: 2.1.10.4 $";

/*
 * This file contains functions for manipulating attributes of type string
 *
 * Then there are a set of functions for each type of attribute:
 *	string
 *
 * Each set has functions for:
 *	Decoding the value string to the internal representation.
 *	Encoding the internal attribute form to external form
 *	Setting the value by =, + or - operators.
 *	Comparing a (decoded) value with 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"
 *
 * -------------------------------------------------
 * Set of general attribute functions for attributes
 * with value type "string"
 * -------------------------------------------------
 */

/*
 * decode_str - decode string into string attribute
 *
 *	Returns: 0 if 0k
 *		>0 error number if error
 *		*patr members set
 */

int decode_str(patr, name, rescn, val)
	struct attribute *patr;
	char *name;		/* attribute name */
	char *rescn;		/* resource name - unused here */
	char *val;		/* attribute value */
{
	size_t len;

	if ((patr->at_flags & ATR_VFLAG_SET) && (patr->at_val.at_str))
		(void)free(patr->at_val.at_str);

	if ((val != (char *)0) && ((len = strlen(val) + 1) > 1)) {
		patr->at_val.at_str = malloc((unsigned) len);
		if (patr->at_val.at_str == (char *)0)
			return (PBSE_SYSTEM);
		(void)strcpy(patr->at_val.at_str, val);
		patr->at_flags |= ATR_VFLAG_SET | ATR_VFLAG_MODIFY;
	} else {
		patr->at_flags = (patr->at_flags & ~ATR_VFLAG_SET) |
				 ATR_VFLAG_MODIFY;
		patr->at_val.at_str = (char *)0;
	}
	return (0);
}

/*
 * encode_str - encode attribute of type ATR_TYPE_STR into attr_extern
 *
 *	Returns: >0 if ok
 *		 =0 if no value, so no link added to list
 *		 <0 if error
 */
/*ARGSUSED*/

int encode_str(attr, phead, atname, rsname, mode)
	attribute	*attr;	  /* ptr to attribute */
	list_head	*phead;	  /* head of attrlist */
	char		*atname;  /* name of attribute */
	char		*rsname;  /* resource name or null */
	int		 mode;	  /* encode mode, unused here */
	
{
	svrattrl *pal;

	if ( !attr )
		return (-1);
	if ( !(attr->at_flags & ATR_VFLAG_SET) || !attr->at_val.at_str ||
	    (*attr->at_val.at_str == '\0'))
		return (0);

	pal = attrlist_create(atname,rsname,(int)strlen(attr->at_val.at_str)+1);
	if (pal == (svrattrl *)0)
		return (-1);

	(void)strcpy(pal->al_value, attr->at_val.at_str);
	pal->al_flags = attr->at_flags;
	append_link(phead, &pal->al_link, pal);

	return (1);
}

/*
 * set_str - set attribute value based upon another
 *
 *	A+B --> B is concatenated to end of A
 *	A=B --> A is replaced with B
 *	A-B --> If B is a substring at the end of A, it is stripped off
 *
 *	Returns: 0 if ok
 *		>0 if error
 */

int set_str(attr, new, op)
	struct attribute *attr;
	struct attribute *new;
	enum batch_op op;
{
	char	*new_value;
	char	*p;
	size_t nsize;

	assert( attr && new && new->at_val.at_str && (new->at_flags & ATR_VFLAG_SET));
	nsize = strlen(new->at_val.at_str) + 1;	/* length of new string */
	if ((op == INCR) && !attr->at_val.at_str)
		op = SET;	/* no current string, change INCR to SET */

	switch (op) {

	    case SET:	/* set is replace old string with new */

		if (attr->at_val.at_str)
			(void)free(attr->at_val.at_str);
		if ((attr->at_val.at_str = malloc(nsize)) == (char *)0)
			return (PBSE_SYSTEM);
		(void)strcpy(attr->at_val.at_str, new->at_val.at_str);
		break;

	    case INCR:	/* INCR is concatenate new to old string */

		nsize += strlen(attr->at_val.at_str);
		if (attr->at_val.at_str)
			new_value = realloc(attr->at_val.at_str, nsize);
		else
			new_value = malloc(nsize);
		if (new_value == (char *)0)
			return (PBSE_SYSTEM);
		attr->at_val.at_str = new_value;
		(void)strcat(attr->at_val.at_str, new->at_val.at_str);
		break;

	    case DECR:	/* DECR is remove substring if match, start at end */

		if (!attr->at_val.at_str)
			break;

		if (--nsize == 0)
			break;
		p = attr->at_val.at_str + strlen(attr->at_val.at_str) - nsize;
		while (p >= attr->at_val.at_str) {
			if (strncmp(p, new->at_val.at_str, (int)nsize) == 0) {
				do {
					*p = *(p + nsize);
				} while (*p++);
		  	}
			p--;
		}
		break;

	    default:	return (PBSE_INTERNAL);
	}
	if ((attr->at_val.at_str != (char *)0) && (*attr->at_val.at_str !='\0'))
		attr->at_flags |= ATR_VFLAG_SET | ATR_VFLAG_MODIFY;
	else
		attr->at_flags &= ~ATR_VFLAG_SET;

	return (0);
}

/* 
 * comp_str - compare two attributes of type ATR_TYPE_STR
 *
 *	Returns: see strcmp(3)
 */

int comp_str(attr, with)
	struct attribute *attr;
	struct attribute *with;
{
	if ( !attr || !attr->at_val.at_str)
		return (-1);
	return (strcmp(attr->at_val.at_str, with->at_val.at_str));
}

/*
 * free_str - free space malloc-ed for string attribute value
 */
void free_str(attr)
	struct attribute *attr;
{
	if ((attr->at_flags & ATR_VFLAG_SET) && (attr->at_val.at_str)) {
		(void)free(attr->at_val.at_str);
	}
	attr->at_val.at_str = (char *)0;
	attr->at_flags &= ~ATR_VFLAG_SET;
}