"-O ftrunc=": implement file truncations (without sanity checks).

[tfcrypt.git] / tfcrypt.c

diff --git a/tfcrypt.c b/tfcrypt.c
index 5ed5bbf1979cad49d5ee15bc876495b82ebc822a..3534bb836c76b8ee3b9dbdca3215f728a9b2c731 100644 (file)
--- a/tfcrypt.c
+++ b/tfcrypt.c
@@ -376,6 +376,17 @@ _baddfname:
                                                if (counter_opt == TFC_CTR_HEAD)
                                                        maxlen += TF_BLOCK_SIZE;
                                        }
+                                       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);
+                                               }
+                                               else ftrunc_dfd = tfc_modifysize(ftrunc_dfd, strchr(s, ':'));
+                                       }
                                        else if (!strncmp(s, "xkey", 4) && *(s+4) == '=') {
                                                s += 5;
                                                maxkeylen = tfc_humanfsize(s, &stoi);
@@ -1277,6 +1288,7 @@ _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);
        xclose(dfd);
 
        xexit(exitcode);