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/*
* Suffix appending for in-place editing under MS-DOS and OS/2.
*
* Here are the rules:
*
* Style 0: Append the suffix exactly as standard perl would do it.
* If the filesystem groks it, use it. (HPFS will always
* grok it. FAT will rarely accept it.)
*
* Style 1: The suffix begins with a '.'. The extension is replaced.
* If the name matches the original name, use the fallback method.
*
* Style 2: The suffix is a single character, not a '.'. Try to add the
* suffix to the following places, using the first one that works.
* [1] Append to extension.
* [2] Append to filename,
* [3] Replace end of extension,
* [4] Replace end of filename.
* If the name matches the original name, use the fallback method.
*
* Style 3: Any other case: Ignore the suffix completely and use the
* fallback method.
*
* Fallback method: Change the extension to ".$$$". If that matches the
* original name, then change the extension to ".~~~".
*
* If filename is more than 1000 characters long, we die a horrible
* death. Sorry.
*
* The filename restriction is a cheat so that we can use buf[] to store
* assorted temporary goo.
*
* Examples, assuming style 0 failed.
*
* suffix = ".bak" (style 1)
* foo.bar => foo.bak
* foo.bak => foo.$$$ (fallback)
* foo.$$$ => foo.~~~ (fallback)
* makefile => makefile.bak
*
* suffix = "~" (style 2)
* foo.c => foo.c~
* foo.c~ => foo.c~~
* foo.c~~ => foo~.c~~
* foo~.c~~ => foo~~.c~~
* foo~~~~~.c~~ => foo~~~~~.$$$ (fallback)
*
* foo.pas => foo~.pas
* makefile => makefile.~
* longname.fil => longname.fi~
* longname.fi~ => longnam~.fi~
* longnam~.fi~ => longnam~.$$$
*
*/
#include "EXTERN.h"
#include "perl.h"
#ifdef OS2
#define INCL_DOSFILEMGR
#define INCL_DOSERRORS
#include <os2.h>
#endif /* OS2 */
static char suffix1[] = ".$$$";
static char suffix2[] = ".~~~";
#define ext (&buf[1000])
add_suffix(str,suffix)
register STR *str;
register char *suffix;
{
int baselen;
int extlen;
char *s, *t, *p;
STRLEN slen;
if (!(str->str_pok)) (void)str_2ptr(str);
if (str->str_cur > 1000)
fatal("Cannot do inplace edit on long filename (%d characters)", str->str_cur);
#ifdef OS2
/* Style 0 */
slen = str->str_cur;
str_cat(str, suffix);
if (valid_filename(str->str_ptr)) return;
/* Fooey, style 0 failed. Fix str before continuing. */
str->str_ptr[str->str_cur = slen] = '\0';
#endif /* OS2 */
slen = strlen(suffix);
t = buf; baselen = 0; s = str->str_ptr;
while ( (*t = *s) && *s != '.') {
baselen++;
if (*s == '\\' || *s == '/') baselen = 0;
s++; t++;
}
p = t;
t = ext; extlen = 0;
while (*t++ = *s++) extlen++;
if (extlen == 0) { ext[0] = '.'; ext[1] = 0; extlen++; }
if (*suffix == '.') { /* Style 1 */
if (strEQ(ext, suffix)) goto fallback;
strcpy(p, suffix);
} else if (suffix[1] == '\0') { /* Style 2 */
if (extlen < 4) {
ext[extlen] = *suffix;
ext[++extlen] = '\0';
} else if (baselen < 8) {
*p++ = *suffix;
} else if (ext[3] != *suffix) {
ext[3] = *suffix;
} else if (buf[7] != *suffix) {
buf[7] = *suffix;
} else goto fallback;
strcpy(p, ext);
} else { /* Style 3: Panic */
fallback:
(void)bcopy(strEQ(ext, suffix1) ? suffix2 : suffix1, p, 4+1);
}
str_set(str, buf);
}
#ifdef OS2
int
valid_filename(s)
char *s;
{
HFILE hf;
USHORT usAction;
switch(DosOpen(s, &hf, &usAction, 0L, 0, FILE_OPEN,
OPEN_ACCESS_READONLY | OPEN_SHARE_DENYNONE, 0L)) {
case NO_ERROR:
DosClose(hf);
/*FALLTHROUGH*/
default:
return 1;
case ERROR_FILENAME_EXCED_RANGE:
return 0;
}
}
#endif /* OS2 */
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