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-
- /******************************************************************************
-
- MODULE
- Exists.c
-
- DESCRIPTION
- Get one filename on Commandline
- and write to StdOut if it exists
-
- NOTES
- Kickstart 2.0+ required
- compiles w/ SAS/C v6.51
-
- BUGS
- We use 'Lock', so Exists fails, if the
- file exists and is exclusively locked
-
- TODO
- Use another way than 'Lock' to determine
- the existance
-
- EXAMPLES
- > Exists Sys:System/CLI
- 1
-
- SEE ALSO
-
- INDEX
-
- HISTORY
- 20-03-94 b_noll created
- 03-02-95 b_noll created (had forgotten the first version =8-})
- 11-02-95 b_noll added FULL Keyword
- 20-02-95 b_noll restructured source
- 21-02-95 b_noll added version/format-prefix/offset
- 20-03-95 b_noll added args diagnostics
-
- AUTHOR
- Bernd Noll, Brunnenstrasse 55, D-67661 Kaiserslautern
- b_noll@informatik.uni-kl.de
-
- ******************************************************************************/
-
- /**************************************
- Includes
- **************************************/
-
- #ifndef EXEC_LIBRARIES_H
- # include <exec/libraries.h>
- #endif /* EXEC_LIBRARIES_H */
-
- #ifndef CLIB_EXEC_PROTOS_H
- # include <clib/exec_protos.h>
- #endif /* CLIB_EXEC_PROTOS_H */
-
- #ifndef DOS_DOS_H
- # include <dos/dos.h>
- #endif /* DOS_DOS_H */
-
- #ifndef CLIB_DOS_PROTOS_H
- # include <clib/dos_protos.h>
- #endif /* CLIB_DOS_PROTOS_H */
-
- #include <proto/dos.h>
- #include <proto/exec.h>
-
-
- /**************************************
- Defines & Structures
- **************************************/
-
- #ifndef ABSEXECBASE
- #define ABSEXECBASE ((struct ExecBase **)4L)
- #endif
-
- struct _arg {
- /* ******************** USER FORMAT ******************** */
- #define FORMAT "FILE/A,NAME/S,FULL/S"
-
- STRPTR file;
- ULONG name;
- ULONG full;
-
- /* ******************** USER FORMAT ******************** */
- }; /* struct _argv */
-
- #define MAXPATHLEN 256
- #define MAXLINELEN 256
-
- #define VERSIONPREFIX "\0$VER: "
- #define VERSIONOFFSET 0
- #define FORMATPREFIX "\0$ARG: "
- #define FORMATOFFSET 7
-
- /**************************************
- Implementation
- **************************************/
-
- long _main (void)
- {
- const char* version = VERSIONPREFIX "Exists 1.3 " __AMIGADATE__ + VERSIONOFFSET;
- long retval = RETURN_FAIL;
- struct ExecBase*SysBase = *ABSEXECBASE;
- struct Library* DOSBase;
-
- if (DOSBase = OpenLibrary (DOSNAME, 37)) {
- struct _arg argv = { 0 };
- APTR args;
- retval = RETURN_ERROR;
- if (args = (void*)ReadArgs(FORMATPREFIX FORMAT + FORMATOFFSET, (LONG*)&argv, NULL)) {
- /* ******************** USER BODY ******************** */
-
- APTR pw;
- struct Process *p;
- STRPTR ostr;
- BPTR lock;
-
- if ((p = (struct Process *)FindTask(NULL))) {
- pw = p->pr_WindowPtr;
- p->pr_WindowPtr = (APTR)-1;
- } /* if */
-
- /* ---- Existance check: rv==0->Exists, rv==5->n/e */
- retval = RETURN_WARN;
- {
- #if 1
- UBYTE buffer[MAXPATHLEN];
-
- if ((lock = Lock(argv.file, ACCESS_READ))) {
- retval = RETURN_OK;
-
- if (argv.full) {
- NameFromLock(lock, buffer, sizeof(buffer));
- ostr = buffer;
- } else if (argv.name) {
- ostr = argv.file;
- } else {
- ostr = "1";
- } /* if */
-
- UnLock (lock);
- } else if (IoErr() == ERROR_OBJECT_IN_USE) {
- retval = RETURN_OK;
- ostr = (argv.name || argv.full) ? argv.file : "1";
- } else {
- ostr = (argv.name || argv.full) ? "" : "0";
- } /* if */
- #else
-
- struct AnchorPath *ap;
- UBYTE apb[sizeof (*ap) + 8 + MATHPATHLEN];
- ap = (void *)(((ULONG)apb + 7) & ~7);
- ap->ap_Strlen = MAXPATHLEN;
- ap->ap_BreakBits = 0;
- ap->ap_FoundBreak = 0;
- ap->ap_Flags = 0;
- error = MatchFirst(argv.file, ap);
- MathEnd (ap);
- if (!error) {
- retval = RETURN_OK;
- ostr = (argv.full) ? ap->ap_Buf :
- (argv.name) ? argv.file : "1";
- } else {
- ostr = (argv.name || argv.full) ? "" : "0";
- } /* if */
-
- #endif
-
- /* ----- Result output, either boolean(0/1) or named (name/"") */
- PutStr( ostr );
- PutStr( "\n" );
- }
-
- if (p != NULL) {
- p->pr_WindowPtr = pw;
- } /* if */
-
- /* ******************** USER BODY ******************** */
- FreeArgs (args);
- } /* if */
-
- if (retval > RETURN_WARN)
- PrintFault(IoErr(), "Exists");
-
- CloseLibrary (DOSBase);
- } /* if */
- return (retval);
- } /* _main */
-
- /******************************************************************************
- ***** END Exists.c
- ******************************************************************************/
-
-