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/*******************************************************************************
* *
* fileUtils.c -- File utilities for Nirvana applications *
* *
* Copyright (c) 1991 Universities Research Association, Inc. *
* All rights reserved. *
* *
* This material resulted from work developed under a Government Contract and *
* is subject to the following license: The Government retains a paid-up, *
* nonexclusive, irrevocable worldwide license to reproduce, prepare derivative *
* works, perform publicly and display publicly by or for the Government, *
* including the right to distribute to other Government contractors. Neither *
* the United States nor the United States Department of Energy, nor any of *
* their employees, makes any warrenty, express or implied, or assumes any *
* legal liability or responsibility for the accuracy, completeness, or *
* usefulness of any information, apparatus, product, or process disclosed, or *
* represents that its use would not infringe privately owned rights. *
* *
* Fermilab Nirvana GUI Library *
* July 28, 1992 *
* *
* Written by Mark Edel *
* *
* Modified by: DMR - Ported to VMS (1st stage for Histo-Scope) *
* *
*******************************************************************************/
static char SCCSID[] = "@(#)fileUtils.c 1.5 1/10/96";
#include <string.h>
#ifdef VAXC
#define NULL (void *) 0
#endif /*VAXC*/
#ifdef VMS
#include "vmsparam.h"
#else
#include <sys/param.h>
#include <unistd.h>
#include <pwd.h>
#endif /*VMS*/
#include "fileUtils.h"
#define TRUE 1
#define FALSE 0
static int normalizePathname(char *pathname);
static int compressPathname(char *pathname);
static char *nextSlash(char *ptr);
static char *prevSlash(char *ptr);
static int compareThruSlash(char *string1, char *string2);
static void copyThruSlash(char **toString, char **fromString);
/*
** Decompose a Unix file name into a file name and a path
*/
int ParseFilename(char *fullname, char *filename, char *pathname)
{
int fullLen = strlen(fullname);
int i, pathLen, fileLen;
#ifdef VMS
/* find the last ] or : */
for (i=fullLen-1; i>=0; i--) {
if (fullname[i] == ']' || fullname[i] == ':')
break;
}
#else /* UNIX */
/* find the last slash */
for (i=fullLen-1; i>=0; i--) {
if (fullname[i] == '/')
break;
}
#endif
/* move chars before / (or ] or :) into pathname,& after into filename */
pathLen = i + 1;
fileLen = fullLen - pathLen;
strncpy(pathname, fullname, pathLen);
pathname[pathLen] = 0;
strncpy(filename, &fullname[pathLen], fileLen);
filename[fileLen] = 0;
#ifdef VMS
return TRUE;
#else /* UNIX specific... Modify at a later date for VMS */
return normalizePathname(pathname);
#endif
}
#ifndef VMS
/*
** Expand tilde characters which begin file names as done by the shell
*/
int ExpandTilde(char *pathname)
{
struct passwd *passwdEntry;
char username[MAXPATHLEN], temp[MAXPATHLEN], *nameEnd;
if (pathname[0] != '~')
return TRUE;
nameEnd = strchr(&pathname[1], '/');
if (nameEnd == NULL)
nameEnd = pathname + strlen(pathname);
strncpy(username, &pathname[1], nameEnd - &pathname[1]);
username[nameEnd - &pathname[1]] = '\0';
if (username[0] == '\0')
passwdEntry = getpwuid(getuid());
else
passwdEntry = getpwnam(username);
if (passwdEntry == NULL)
return FALSE;
sprintf(temp, "%s/%s", passwdEntry->pw_dir, nameEnd);
printf("expanded path name to \"%s\"\n", temp);
strcpy(pathname, temp);
return TRUE;
}
static int normalizePathname(char *pathname)
{
char oldPathname[MAXPATHLEN], wd[MAXPATHLEN];
/* if this is a relative pathname, prepend current directory */
if (pathname[0] != '/') {
/* make a copy of pathname to work from */
strcpy(oldPathname, pathname);
/* get the working directory */
getcwd(wd, MAXPATHLEN);
/* prepend it to the path */
strcpy(pathname, wd);
strcat(pathname, "/");
strcat(pathname, oldPathname);
}
/* compress out .. and . */
return compressPathname(pathname);
}
static int compressPathname(char *pathname)
{
char *inPtr, *outPtr;
/* compress out . and .. */
inPtr = &pathname[1]; /* start after initial / */
outPtr = &pathname[1];
while (TRUE) {
/* if the next component is "../", remove previous component */
if (compareThruSlash(inPtr, "../")) {
/* error if already at beginning of string */
if (outPtr == &pathname[1])
return FALSE;
/* back up outPtr to remove last path name component */
outPtr = prevSlash(outPtr);
inPtr = nextSlash(inPtr);
} else if (compareThruSlash(inPtr, "./")) {
/* don't copy the component if it's the redundant "./" */
inPtr = nextSlash(inPtr);
} else {
/* copy the component to outPtr */
copyThruSlash(&outPtr, &inPtr);
}
if (inPtr == NULL) {
return TRUE;
}
}
}
static char *nextSlash(char *ptr)
{
for(; *ptr!='/'; ptr++) {
if (*ptr == '\0')
return NULL;
}
return ptr + 1;
}
static char *prevSlash(char *ptr)
{
for(ptr -= 2; *ptr!='/'; ptr--);
return ptr + 1;
}
static int compareThruSlash(char *string1, char *string2)
{
while (TRUE) {
if (*string1 != *string2)
return FALSE;
if (*string1 =='\0' || *string1=='/')
return TRUE;
string1++;
string2++;
}
}
static void copyThruSlash(char **toString, char **fromString)
{
char *to = *toString;
char *from = *fromString;
while (TRUE) {
*to = *from;
if (*from =='\0') {
*fromString = NULL;
return;
}
if (*from=='/') {
*toString = to + 1;
*fromString = from + 1;
return;
}
from++;
to++;
}
}
#endif /* UNIX */
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