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/*
* Copyright (c) 1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND CARNEGIE MELLON UNIVERSITY
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT
* SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Users of this software agree to return to Carnegie Mellon any
* improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* Export of this software is permitted only after complying with the
* regulations of the U.S. Deptartment of Commerce relating to the
* Export of Technical Data.
*/
/* fwantread -- attempt to open file for input
*
* Usage: f = fwantread (path,file,fullname,prompt);
* FILE *f;
* char *path,*file,*fullname,*prompt;
*
* Fwantread will search through the specified path for the
* specified file, attempting to open it for input if it is
* found. If no such file is found, the user is given
* an opportunity to enter a new file name (after the prompt is
* printed). The new file will then be sought using the same
* path.
* If the path is the null string, the file will be searched for
* with no prefix. If the file name is null, the user will be
* prompted for a file name immediately. The user can always
* abort fwantread by typing just a carriage return to the prompt.
* Fwantread will put the name of the successfully opened file into
* the "fullname" string (which therefore must be long enough to hold a
* complete file name), and return its file pointer; if no file
* is successfully found, 0 is returned.
*
* HISTORY
* $Log: fwantread.c,v $
* Revision 1.2 90/12/11 17:53:24 mja
* Add copyright/disclaimer for distribution.
*
* 21-Oct-81 Fil Alleva (faa) at Carnegie-Mellon University
* Fixed bug which caused an infinite loop when getstr() got
* an EOT error and returned NULL. The error return was ignored
* and the value of "answer" was not changed which caused the loop.
*
* 28-Aug-80 Mike Accetta (mja) at Carnegie-Mellon University
* Fixed bug which used the "file" string to hold name typed at terminal
* even though "file" may have been passed as a constant.
*
* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
* Created for VAX. Nobody can anticipate if it's a win or a lose
* to use path-searching; we'll have to see.
*
*/
#include <stdio.h>
int strcmp();
FILE *fopenp();
char *getstr();
FILE *fwantread (path,file,fullname,prompt)
char *path,*file,*fullname,*prompt;
{
register FILE *value;
char myfile[200], *retval;
if (*file == '\0') {
getstr (prompt,"no file",myfile);
if (strcmp(myfile,"no file") == 0) return (0);
}
else
strcpy(myfile, file);
do {
value = fopenp (path,myfile,fullname,"r");
if (value == 0) {
if (*path && (*myfile != '/')) {
sprintf (fullname,"Want to read %s in path \"%s\"",myfile,path);
}
else {
sprintf (fullname,"Want to read %s",myfile);
}
perror (fullname);
retval = getstr (prompt,"no file",myfile);
if ((strcmp(myfile,"no file") == 0) || retval == NULL)
return (0);
}
}
while (value == 0);
return (value);
}
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