pathopen.txt

Dos6.0

SUMMARY pathopen findpath

#include <tools.h>

flagType findpath(pstrFile, pbuf, fNew)
char *pstrFile;
char *pbuf;
flagType fNew;

FILE *pathopen(pstrName, pbuf, pmode)
char *pstrName;
char *pbuf;
char *pmode;

DESCRIPTION

findpath tries to find the file specified by pstrFile.  If pstrFile is of
the form $FOO:BAR where FOO is an environment variable each directory in the
environment variable is searched else the current directory is searched.

If the file is found and pbuf is filled in with the expanded path name and
nonzero is returned.

If the file is not found and fnew is FALSE, zero is returned

If the file is not found and fnew is TRUE pbuf is filled in with the filename
suitable for creating a new file and nonzero is returned, i.e. if pstrFile
is of the form $FOO:BAR, the first directory in the environment variable FOO
is used to create the filename.

E.g.

    PATH:C:\BIN;C:\MYBIN;

if

    findpath("$PATH:BAR", buf, TRUE);

returns nonzero if BAR exists in C:\BIN or C:\MYBIN and buf contains either
C:\BIN\BAR or C:\BIN\BAR; returns zero if BAR does not exist in either and
contents of bar are undefined.

    findpath("$PATH:BAR", buf, FALSE);

always returns nonzero, buf is equal to C:\BIN\BAR or C:\BIN\BAR if it exists
or C:\BIN\BAR if it doesn't exist in both.  (Note: stat(buf, pstatBuf) can
be used to determine if the file exists.)

pathopen expands pstrName to pbuf using findpath with fnew == TRUE and if
it succeeds calls the C library routine fopen with pbuf and mode and returns
the value returned by fopen.  If the call to findpath fails NULL is returned
by pathopen.

RETURN VALUE

See above.

IMPLEMENTATION


SEE ALSO   fopen (C runtime)

NOTE

In findpath, pbuf must point to a buffer large enough to hold the expanded
pathname, e.g. buf[MAXPATHLEN].

EXAMPLE

#include <tools.h>

main(c, argv)
int c;
char *argv[];
{
    char str[MAXPATHLEN];
    flagType f;

    f = findpath("$USER:\\tools.ini", str, TRUE ); printf("%d %s\n", f, str);
    f = findpath("$USER:\\tools.tmp", str, TRUE ); printf("%d %s\n", f, str);
    f = findpath("$USER:\\tools.tmp", str, FALSE); printf("%d %s\n", f, str);
    f = findpath("test.c", str, TRUE ); printf("%d %s\n", f, str);
}


give the output assuming SET USER=C:\DANL and TOOLS.INI does exist, TOOLS.TMP
does not exist in C:\DANL and TEST.C exists in current directory.

	-1 c:\danl\tools.ini
	-1 c:\danl\tools.tmp
	 0 c:\danl\tools.tmp
	-1 test.c