prepare_path.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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* This license covers use of the OpenPBS v2.3 software (the "Software") at
* your site or location, and, for certain users, redistribution of the
* Software to other sites and locations.  Use and redistribution of
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*/
/*
 * perpare_path
 *
 *	Perpare a full path name to give to the server.
 *
 */

#include <pbs_config.h>   /* the master config generated by configure */

#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "pbs_ifl.h"
#include "net_connect.h"

static char ident[] = "@(#) $RCSfile: prepare_path.c,v $ $Revision: 2.1.10.6 $";

int 
prepare_path(path_in, path_out)
char *path_in;
char *path_out;
{
    int i;
    char *c;
    char host_name[PBS_MAXSERVERNAME+1];
    int h_pos;
    char path_name[MAXPATHLEN+1];
    int p_pos;
    char cwd[MAXPATHLEN+1];
    char *host_given;
    struct	stat	statbuf;
    dev_t	dev;
    ino_t	ino;

/* initialize data for this parsing call */
    for ( i=0; i<= PBS_MAXSERVERNAME; i++ ) host_name[i]='\0';
    h_pos = 0;
    for ( i=0; i<= MAXPATHLEN; i++ ) path_name[i]='\0';
    p_pos = 0;
    cwd[MAXPATHLEN] = '\0';

/* Begin the parse */
    c = path_in;
    while ((int)isspace(*c)) c++;
    if ( strlen(c) == 0 ) return 1;

/* Looking for a hostname :  */
    if ( (host_given=strchr(path_in, ':')) != NULL ) {
        while ( *c != ':' && *c != '\0' ) {
            if ( isalnum(*c) || (*c == '.') || (*c == '-') || (*c == '_') )
                host_name[h_pos++]=*c;
            else
                break;
            c++;
        }
    }

/* Looking for a posix path */
    if ( (*c == ':') || (c == path_in) ) {
        if ( *c == ':' ) c++;
        while ( *c != '\0' ) {
            if ( isgraph(*c) )
                path_name[p_pos++]=*c;
            else
                break;
            c++;
        }
    }

    /* we had trailing trash, or a parse error */
    if ( *c != '\0' ) return 1;
    if ( strlen(path_name) == 0 ) return 1;

/* get full host name */
    if ( host_name[0] == '\0' ) {
        if ( gethostname(host_name, PBS_MAXSERVERNAME) != 0 ) return 2;
    }
    if ( get_fullhostname(host_name, host_name, PBS_MAXSERVERNAME) != 0 ) return 2;

/* prepare complete path name */
    strcpy(path_out, host_name);
    strcat(path_out, ":");
    if ( path_name[0] != '/' && host_given == NULL ) {
     	c = getenv("PWD");		/* PWD carries a name that will cause */
 	if ( c != NULL ) {		/* the NFS to mount */
 	
 	    if (stat(c, &statbuf) < 0) {	/* can't stat PWD */
 		c = NULL;
     	    } else {
 		dev = statbuf.st_dev;
 		ino = statbuf.st_ino;	
 		if (stat(".", &statbuf) < 0) {
 		    perror("prepare_path: cannot stat current directory:" );
 		    return (1);
     		}
 	    }
 	    if ( (!memcmp(&dev, &statbuf.st_dev, sizeof(dev_t))) &&
	         (!memcmp(&ino, &statbuf.st_ino, sizeof(ino_t))) ) {
         	strcpy(cwd, c);
 	    } else {
 		c = NULL;
 	    }
 	}
 	if (c == NULL) {
 	    c = getcwd(cwd, MAXPATHLEN);
 	    if ( c == NULL ) {
 		perror("prepare_path: getcwd failed : ");
 		return (1);
 	    }
 	}
        strcat(path_out, cwd);
        strcat(path_out, "/");
    }
    strcat(path_out, path_name);

    return (0);
}