-O ftrunc=tail: trim unused tail after processing actual data.

[tfcrypt.git] / tfcrypt.c

diff --git a/tfcrypt.c b/tfcrypt.c
index d673d386e7757cf739ffc35fbf35283476b39e3b..fb3dfb9cb44a7e0826dc059c13c555ef7ecbc761 100644 (file)
--- a/tfcrypt.c
+++ b/tfcrypt.c
@@ -425,14 +425,21 @@ _baddfname:
                                        }
                                        else if (!strncmp(s, "ftrunc", 6) && *(s+6) == '=') {
                                                s += 7;
-                                               ftrunc_dfd = tfc_humanfsize(s, &stoi);
-                                               if (!str_empty(stoi)) {
-                                                       ftrunc_dfd = tfc_fnamesize(s, YES);
-                                                       ftrunc_dfd = tfc_modifysize(ftrunc_dfd, strchr(s, ':'));
-                                                       if (ftrunc_dfd == NOFSIZE) xerror(NO, YES, YES,
-                                                       "%s: invalid ftrunc value", s);
+                                               if (!strcmp(s, "tail")) {
+                                                       do_ftrunc = TFC_FTRUNC_TAIL;
+                                                       ftrunc_dfd = NOFSIZE;
+                                               }
+                                               else {
+                                                       do_ftrunc = TFC_DO_FTRUNC;
+                                                       ftrunc_dfd = tfc_humanfsize(s, &stoi);
+                                                       if (!str_empty(stoi)) {
+                                                               ftrunc_dfd = tfc_fnamesize(s, YES);
+                                                               ftrunc_dfd = tfc_modifysize(ftrunc_dfd, strchr(s, ':'));
+                                                               if (ftrunc_dfd == NOFSIZE) xerror(NO, YES, YES,
+                                                               "%s: invalid ftrunc value", s);
+                                                       }
+                                                       else ftrunc_dfd = tfc_modifysize(ftrunc_dfd, strchr(s, ':'));
                                                }
-                                               else ftrunc_dfd = tfc_modifysize(ftrunc_dfd, strchr(s, ':'));
                                        }
                                        else if (!strncmp(s, "xkey", 4) && *(s+4) == '=') {
                                                s += 5;
@@ -1333,7 +1340,10 @@ _nomac:
 
        if (do_preserve_time) fcopy_matime(dfd, &s_stat);
        xclose(sfd);
-       if (ftrunc_dfd != NOFSIZE) if (ftruncate(dfd, (off_t)ftrunc_dfd) == -1) xerror(YES, NO, YES, "ftruncate(%d)", dfd);
+       if (do_ftrunc > TFC_NO_FTRUNC) {
+               if (do_ftrunc == TFC_FTRUNC_TAIL) ftrunc_dfd = total_processed_dst;
+               if (ftruncate(dfd, (off_t)ftrunc_dfd) == -1) xerror(YES, NO, YES, "ftruncate(%d)", dfd);
+       }
        xclose(dfd);
 
        xexit(exitcode);