char *ft;
int wf;
{
- register char *p1, *p2, *p3;
+ register char *p2, *p3;
register int c;
FILE *fp;
- p1 = fn;
p2 = afn;
p3 = ft;
- while ((c = *p1++) != 0 && c != FSEPX) {
- if (p2 < &afn[FILSPC-4])
- *p2++ = c;
- }
+
+ strcpy (afn, fn);
+ p2 = strrchr (afn, FSEPX); // search last '.'
+ if (!p2)
+ p2 = afn + strlen (afn);
+ if (p2 > &afn[FILSPC-4]) // truncate filename, if it's too long
+ p2 = &afn[FILSPC-4];
*p2++ = FSEPX;
- if (*p3 == 0) {
- if (c == FSEPX) {
- p3 = p1;
- } else {
- p3 = dsft;
- }
+
+ // choose a file-extension
+ if (*p3 == 0) { // extension supplied?
+ p3 = strrchr (fn, FSEPX); // no: extension in fn?
+ if (p3)
+ ++p3;
+ else
+ p3 = dsft; // no: default extension
}
- while ((c = *p3++) != 0) {
+
+ while ((c = *p3++) != 0) { // strncpy
if (p2 < &afn[FILSPC-1])
*p2++ = c;
}
*p2++ = 0;
+
if ((fp = fopen(afn, wf?"w":"r")) == NULL) {
fprintf(stderr, "%s: cannot %s.\n", afn, wf?"create":"open");
asexit(1);