diff --git a/client/cmdflashmem.c b/client/cmdflashmem.c
index cbf336773..3a202c875 100644
--- a/client/cmdflashmem.c
+++ b/client/cmdflashmem.c
@@ -222,7 +222,7 @@ static int CmdFlashMemLoad(const char *Cmd) {
     switch (d) {
         case DICTIONARY_MIFARE:
             start_index = DEFAULT_MF_KEYS_OFFSET;
-            res = loadFileDICTIONARY(filename, "dic", data + 2, &datalen, 6, &keycount);
+            res = loadFileDICTIONARY(filename, data + 2, &datalen, 6, &keycount);
             if (res || !keycount) {
                 free(data);
                 return PM3_EFILE;
@@ -233,7 +233,7 @@ static int CmdFlashMemLoad(const char *Cmd) {
             break;
         case DICTIONARY_T55XX:
             start_index = DEFAULT_T55XX_KEYS_OFFSET;
-            res = loadFileDICTIONARY(filename, "dic", data + 2, &datalen, 4, &keycount);
+            res = loadFileDICTIONARY(filename, data + 2, &datalen, 4, &keycount);
             if (res || !keycount) {
                 free(data);
                 return PM3_EFILE;
@@ -244,7 +244,7 @@ static int CmdFlashMemLoad(const char *Cmd) {
             break;
         case DICTIONARY_ICLASS:
             start_index = DEFAULT_ICLASS_KEYS_OFFSET;
-            res = loadFileDICTIONARY(filename, "dic", data + 2, &datalen, 8, &keycount);
+            res = loadFileDICTIONARY(filename, data + 2, &datalen, 8, &keycount);
             if (res || !keycount) {
                 free(data);
                 return PM3_EFILE;
@@ -254,8 +254,8 @@ static int CmdFlashMemLoad(const char *Cmd) {
             datalen += 2;
             break;
         case DICTIONARY_NONE:
-            res = loadFile(filename, "bin", data, FLASH_MEM_MAX_SIZE, &datalen);
-            //int res = loadFileEML( filename, "eml", data, &datalen);
+            res = loadFile(filename, ".bin", data, FLASH_MEM_MAX_SIZE, &datalen);
+            //int res = loadFileEML( filename, data, &datalen);
             if (res) {
                 free(data);
                 return PM3_EFILE;
@@ -367,8 +367,8 @@ static int CmdFlashMemSave(const char *Cmd) {
         return PM3_EFLASH;
     }
 
-    saveFile(filename, "bin", dump, len);
-    saveFileEML(filename, "eml", dump, len, 16);
+    saveFile(filename, ".bin", dump, len);
+    saveFileEML(filename, dump, len, 16);
     free(dump);
     return PM3_SUCCESS;
 }
diff --git a/client/cmdhf14b.c b/client/cmdhf14b.c
index 54a292447..3512e4860 100644
--- a/client/cmdhf14b.c
+++ b/client/cmdhf14b.c
@@ -961,8 +961,8 @@ static int CmdHF14BDump(const char *Cmd) {
 
 
     size_t datalen = (blocks + 1) * 4;
-    saveFileEML(filename, "eml", data, datalen, 4);
-    saveFile(filename, "bin", data, datalen);
+    saveFileEML(filename, data, datalen, 4);
+    saveFile(filename, ".bin", data, datalen);
 out:
     return switch_off_field_14b();
 }
diff --git a/client/cmdhf15.c b/client/cmdhf15.c
index 3035d017c..b55904bd6 100644
--- a/client/cmdhf15.c
+++ b/client/cmdhf15.c
@@ -833,8 +833,8 @@ static int CmdHF15Dump(const char *Cmd) {
     PrintAndLogEx(NORMAL, "\n");
 
     size_t datalen = blocknum * 4;
-    saveFileEML(filename, "eml", data, datalen, 4);
-    saveFile(filename, "bin", data, datalen);
+    saveFileEML(filename, data, datalen, 4);
+    saveFile(filename, ".bin", data, datalen);
     return 0;
 }
 
diff --git a/client/cmdhficlass.c b/client/cmdhficlass.c
index 3c32af50a..a794358a7 100644
--- a/client/cmdhficlass.c
+++ b/client/cmdhficlass.c
@@ -422,7 +422,7 @@ static int CmdHFiClassSim(const char *Cmd) {
                 memcpy(dump + i * 24 + 16, resp.data.asBytes + i * 16 + 8, 8);
             }
             /** Now, save to dumpfile **/
-            saveFile("iclass_mac_attack", "bin", dump, datalen);
+            saveFile("iclass_mac_attack", ".bin", dump, datalen);
             free(dump);
             break;
         }
@@ -474,7 +474,7 @@ static int CmdHFiClassSim(const char *Cmd) {
                 // copy NR_MAC (eight bytes from the response)  ( 8b csn + 8b epurse == 16)
                 memcpy(dump + i * MAC_ITEM_SIZE + 16, resp.data.asBytes + i * 16 + 8, 8);
             }
-            saveFile("iclass_mac_attack_keyroll_A", "bin", dump, datalen);
+            saveFile("iclass_mac_attack_keyroll_A", ".bin", dump, datalen);
 
             //KEYROLL 2
             memset(dump, 0, datalen);
@@ -489,7 +489,7 @@ static int CmdHFiClassSim(const char *Cmd) {
                 memcpy(dump + i * MAC_ITEM_SIZE + 16, resp.data.asBytes + resp_index + 8, 8);
                 resp_index++;
             }
-            saveFile("iclass_mac_attack_keyroll_B", "bin", dump, datalen);
+            saveFile("iclass_mac_attack_keyroll_B", ".bin", dump, datalen);
             free(dump);
             break;
         }
@@ -707,7 +707,7 @@ static int CmdHFiClassDecrypt(const char *Cmd) {
         }
     }
 
-    saveFile(outfilename, "bin", decrypted, fsize);
+    saveFile(outfilename, ".bin", decrypted, fsize);
     printIclassDumpContents(decrypted, 1, (fsize / 8), fsize);
     free(decrypted);
     return 0;
@@ -1067,7 +1067,7 @@ static int CmdHFiClassReader_Dump(const char *Cmd) {
 
     // save the dump to .bin file
     PrintAndLogEx(SUCCESS, "saving dump file - %d blocks read", gotBytes / 8);
-    saveFile(filename, "bin", tag_data, gotBytes);
+    saveFile(filename, ".bin", tag_data, gotBytes);
     return 1;
 }
 
diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c
index 21f40dacd..ca5f53a2b 100644
--- a/client/cmdhflegic.c
+++ b/client/cmdhflegic.c
@@ -1199,8 +1199,8 @@ static int CmdLegicESave(const char *Cmd) {
     else
         sprintf(fnameptr + fileNlen, ".bin");
 
-    saveFileEML(filename, "eml", data, numofbytes, 8);
-    saveFile(filename, "bin", data, numofbytes);
+    saveFileEML(filename, data, numofbytes, 8);
+    saveFile(filename, ".bin", data, numofbytes);
     return 0;
 }
 
diff --git a/client/cmdhfmf.c b/client/cmdhfmf.c
index 052bcd191..45be7c2bc 100644
--- a/client/cmdhfmf.c
+++ b/client/cmdhfmf.c
@@ -678,7 +678,7 @@ static uint16_t NumOfBlocks(char card) {
         case '4' :
             return MIFARE_4K_MAXBLOCK;
         default  :
-            return MIFARE_1K_MAXBLOCK;
+            return 0;
     }
 }
 
@@ -693,7 +693,7 @@ static uint8_t NumOfSectors(char card) {
         case '4' :
             return MIFARE_4K_MAXSECTOR;
         default  :
-            return MIFARE_1K_MAXSECTOR;
+            return 0;
     }
 }
 
@@ -748,6 +748,7 @@ static int CmdHF14AMfDump(const char *Cmd) {
             default:
                 if (cmdp == 0) {
                     numSectors = NumOfSectors(param_getchar(Cmd, cmdp));
+                    if (numSectors == 0) return usage_hf14_dump();
                     cmdp++;
                 } else {
                     PrintAndLogEx(WARNING, "Unknown parameter '%c'\n", param_getchar(Cmd, cmdp));
@@ -904,9 +905,9 @@ static int CmdHF14AMfDump(const char *Cmd) {
 
     uint16_t bytes = 16 * (FirstBlockOfSector(numSectors - 1) + NumBlocksPerSector(numSectors - 1));
 
-    saveFile(dataFilename, "bin", (uint8_t *)carddata, bytes);
-    saveFileEML(dataFilename, "eml", (uint8_t *)carddata, bytes, MFBLOCK_SIZE);
-    saveFileJSON(dataFilename, "json", jsfCardMemory, (uint8_t *)carddata, bytes);
+    saveFile(dataFilename, ".bin", (uint8_t *)carddata, bytes);
+    saveFileEML(dataFilename, (uint8_t *)carddata, bytes, MFBLOCK_SIZE);
+    saveFileJSON(dataFilename, jsfCardMemory, (uint8_t *)carddata, bytes);
     return 0;
 }
 
@@ -948,6 +949,7 @@ static int CmdHF14AMfRestore(const char *Cmd) {
             default:
                 if (cmdp == 0) {
                     numSectors = NumOfSectors(param_getchar(Cmd, cmdp));
+                    if (numSectors == 0) return usage_hf14_restore();
                     cmdp++;
                 } else {
                     PrintAndLogEx(WARNING, "Unknown parameter '%c'\n", param_getchar(Cmd, cmdp));
@@ -1101,6 +1103,7 @@ static int CmdHF14AMfNested(const char *Cmd) {
         }
     } else {
         SectorsCnt = NumOfSectors(cmdp);
+        if (SectorsCnt == 0) return usage_hf14_nested();
     }
 
     uint8_t j = 4;
@@ -1803,6 +1806,7 @@ static int CmdHF14AMfChk(const char *Cmd) {
     if (param_getchar(Cmd, 0) == '*') {
         blockNo = 3;
         SectorsCnt = NumOfSectors(param_getchar(Cmd + 1, 0));
+        if (SectorsCnt == 0) return usage_hf14_chk();
     } else {
         blockNo = param_get8(Cmd, 0);
     }
@@ -2562,12 +2566,13 @@ int CmdHF14AMfELoad(const char *Cmd) {
     if (numblk2 > 0)
         numBlocks = numblk2;
 
-    param_getstr(Cmd, nameParamNo, filename, sizeof(filename));
+    if (0 == param_getstr(Cmd, nameParamNo, filename, sizeof(filename)))
+        return usage_hf14_eload();
 
     uint8_t *data = calloc(4096, sizeof(uint8_t));
     size_t datalen = 0;
-    //int res = loadFile(filename, "bin", data, maxdatalen, &datalen);
-    int res = loadFileEML(filename, "eml", data, &datalen);
+    //int res = loadFile(filename, ".bin", data, maxdatalen, &datalen);
+    int res = loadFileEML(filename, data, &datalen);
     if (res) {
         free(data);
         return 1;
@@ -2641,7 +2646,12 @@ static int CmdHF14AMfESave(const char *Cmd) {
     char c = tolower(param_getchar(Cmd, 0));
     if (c == 'h') return usage_hf14_esave();
 
-    blocks = NumOfBlocks(c);
+    if (c != 0) {
+        blocks = NumOfBlocks(c);
+        if (blocks == 0) return usage_hf14_esave();
+    } else {
+        blocks = MIFARE_1K_MAXBLOCK;
+    }
     bytes = blocks * MFBLOCK_SIZE;
 
     dump = calloc(bytes, sizeof(uint8_t));
@@ -2667,9 +2677,9 @@ static int CmdHF14AMfESave(const char *Cmd) {
         FillFileNameByUID(fnameptr, dump, "-dump", 4);
     }
 
-    saveFile(filename, "bin", dump, bytes);
-    saveFileEML(filename, "eml", dump, bytes, MFBLOCK_SIZE);
-    saveFileJSON(filename, "json", jsfCardMemory, dump, bytes);
+    saveFile(filename, ".bin", dump, bytes);
+    saveFileEML(filename, dump, bytes, MFBLOCK_SIZE);
+    saveFileJSON(filename, jsfCardMemory, dump, bytes);
     free(dump);
     return 0;
 }
@@ -2690,7 +2700,12 @@ static int CmdHF14AMfECFill(const char *Cmd) {
         keyType = 1;
 
     c = tolower(param_getchar(Cmd, 1));
-    numSectors = NumOfSectors(c);
+    if (c != 0) {
+        numSectors = NumOfSectors(c);
+        if (numSectors == 0) return usage_hf14_ecfill();
+    } else {
+        numSectors = MIFARE_1K_MAXSECTOR;
+    }
 
     PrintAndLogEx(NORMAL, "--params: numSectors: %d, keyType: %c\n", numSectors, (keyType == 0) ? 'A' : 'B');
     clearCommandBuffer();
@@ -2708,7 +2723,12 @@ static int CmdHF14AMfEKeyPrn(const char *Cmd) {
     if (c == 'h')
         return usage_hf14_ekeyprn();
 
-    numSectors = NumOfSectors(c);
+    if (c != 0) {
+        numSectors = NumOfSectors(c);
+        if (numSectors == 0) return usage_hf14_ekeyprn();
+    } else {
+        numSectors = MIFARE_1K_MAXSECTOR;
+    }
 
     PrintAndLogEx(NORMAL, "|---|----------------|----------------|");
     PrintAndLogEx(NORMAL, "|sec|key A           |key B           |");
@@ -2861,12 +2881,12 @@ static int CmdHF14AMfCLoad(const char *Cmd) {
     size_t datalen = 0;
     int res = 0;
     if (fillFromBin) {
-        res = loadFile(fileName, "bin", data, maxdatalen, &datalen);
+        res = loadFile(fileName, ".bin", data, maxdatalen, &datalen);
     } else {
         if (fillFromJson) {
-            res = loadFileJSON(fileName, "json", data, maxdatalen, &datalen);
+            res = loadFileJSON(fileName, data, maxdatalen, &datalen);
         } else {
-            res = loadFileEML(Cmd, "eml", data, &datalen);
+            res = loadFileEML(Cmd, data, &datalen);
         }
     }
 
@@ -3100,9 +3120,9 @@ static int CmdHF14AMfCSave(const char *Cmd) {
         PrintAndLogEx(SUCCESS, "uploaded %d bytes to emulator memory", bytes);
     }
 
-    saveFile(filename, "bin", dump, bytes);
-    saveFileEML(filename, "eml", dump, bytes, MFBLOCK_SIZE);
-    saveFileJSON(filename, "json", jsfCardMemory, dump, bytes);
+    saveFile(filename, ".bin", dump, bytes);
+    saveFileEML(filename, dump, bytes, MFBLOCK_SIZE);
+    saveFileJSON(filename, jsfCardMemory, dump, bytes);
     free(dump);
     return 0;
 }
diff --git a/client/cmdhfmfu.c b/client/cmdhfmfu.c
index 42816243b..7b242ace1 100644
--- a/client/cmdhfmfu.c
+++ b/client/cmdhfmfu.c
@@ -1969,8 +1969,8 @@ static int CmdHF14AMfUDump(const char *Cmd) {
         FillFileNameByUID(fptr, card.uid, "-dump", card.uidlen);
     }
     uint16_t datalen = pages * 4 + MFU_DUMP_PREFIX_LENGTH;
-    saveFile(filename, "bin", (uint8_t *)&dump_file_data, datalen);
-    saveFileJSON(filename, "json", jsfMfuMemory, (uint8_t *)&dump_file_data, datalen);
+    saveFile(filename, ".bin", (uint8_t *)&dump_file_data, datalen);
+    saveFileJSON(filename, jsfMfuMemory, (uint8_t *)&dump_file_data, datalen);
 
     if (is_partial)
         PrintAndLogEx(WARNING, "Partial dump created. (%d of %d blocks)", pages, card_mem_size);
diff --git a/client/cmdlfhitag.c b/client/cmdlfhitag.c
index 008c53d1b..3d4138565 100644
--- a/client/cmdlfhitag.c
+++ b/client/cmdlfhitag.c
@@ -293,7 +293,7 @@ static int CmdLFHitagSim(const char *Cmd) {
                 break;
             case 'e':
                 param_getstr(Cmd, cmdp + 1, filename, sizeof(filename));
-                res = loadFileEML(filename, "eml", data, &datalen);
+                res = loadFileEML(filename, data, &datalen);
                 if (res > 0 || datalen != maxdatalen) {
                     PrintAndLogDevice(FAILED, "error, bytes read mismatch file size");
                     errors = true;
@@ -304,7 +304,7 @@ static int CmdLFHitagSim(const char *Cmd) {
                 break;
             case 'j':
                 param_getstr(Cmd, cmdp + 1, filename, sizeof(filename));
-                res = loadFileJSON(filename, "json", data, maxdatalen, &datalen);
+                res = loadFileJSON(filename, data, maxdatalen, &datalen);
                 if (res > 0) {
                     errors = true;
                     break;
@@ -314,7 +314,7 @@ static int CmdLFHitagSim(const char *Cmd) {
                 break;
             case 'b':
                 param_getstr(Cmd, cmdp + 1, filename, sizeof(filename));
-                res = loadFile(filename, "bin", data, maxdatalen, &datalen);
+                res = loadFile(filename, ".bin", data, maxdatalen, &datalen);
                 if (res > 0) {
                     errors = true;
                     break;
@@ -579,9 +579,9 @@ static int CmdLFHitagReader(const char *Cmd) {
         fnameptr += sprintf(fnameptr, "lf-hitag-");
         FillFileNameByUID(fnameptr, data, "-dump", 4);
 
-        saveFile(filename, "bin", data, 48);
-        saveFileEML(filename, "eml", data, 48, 4);
-        saveFileJSON(filename, "json", jsfHitag, data, 48);
+        saveFile(filename, ".bin", data, 48);
+        saveFileEML(filename, data, 48, 4);
+        saveFileJSON(filename, jsfHitag, data, 48);
 
         // block3, 1 byte
         printHitagConfiguration(data[4 * 3]);
@@ -607,7 +607,7 @@ static int CmdLFHitagCheckChallenges(const char *Cmd) {
             case 'f':
                 //file with all the challenges to try
                 param_getstr(Cmd, cmdp + 1, filename, sizeof(filename));
-                res = loadFile(filename, "cc", data, 8 * 60, &datalen);
+                res = loadFile(filename, ".cc", data, 8 * 60, &datalen);
                 if (res > 0) {
                     errors = true;
                     break;
diff --git a/client/cmdlft55xx.c b/client/cmdlft55xx.c
index 668a461e0..8057c7469 100644
--- a/client/cmdlft55xx.c
+++ b/client/cmdlft55xx.c
@@ -1903,7 +1903,7 @@ static int CmdT55xxChkPwds(const char *Cmd) {
             return 1;
         }
 
-        int res = loadFileDICTIONARY(filename, "dic", keyBlock, &datalen, 4, &keycount);
+        int res = loadFileDICTIONARY(filename, keyBlock, &datalen, 4, &keycount);
         if (res || keycount == 0) {
             PrintAndLogEx(WARNING, "No keys found in file");
             free(keyBlock);
diff --git a/client/cmdtrace.c b/client/cmdtrace.c
index 7402dfc08..f243999a5 100644
--- a/client/cmdtrace.c
+++ b/client/cmdtrace.c
@@ -563,7 +563,7 @@ static int CmdTraceSave(const char *Cmd) {
     if (strlen(Cmd) < 1 || cmdp == 'h') return usage_trace_save();
 
     param_getstr(Cmd, 0, filename, sizeof(filename));
-    saveFile(filename, "bin", trace, traceLen);
+    saveFile(filename, ".bin", trace, traceLen);
     return 0;
 }
 
diff --git a/client/loclass/fileutils.c b/client/loclass/fileutils.c
index f01fe93aa..5e3b423f7 100644
--- a/client/loclass/fileutils.c
+++ b/client/loclass/fileutils.c
@@ -57,15 +57,49 @@ int fileExists(const char *filename) {
     return result == 0;
 }
 
-int saveFile(const char *preferredName, const char *suffix, const void *data, size_t datalen) {
-    int size = sizeof(char) * (strlen(preferredName) + strlen(suffix) + 10);
-    char *fileName = calloc(size, sizeof(char));
+static char *filenamemcopy(const char *preferredName, const char *suffix) {
+    if (preferredName == NULL) return NULL;
+    if (suffix == NULL) return NULL;
+    char *fileName = (char *) calloc(strlen(preferredName) + strlen(suffix) + 1, sizeof(uint8_t));
+    if (fileName == NULL)
+        return NULL;
+    strcpy(fileName, preferredName);
+    if (str_endswith(fileName, suffix))
+        return fileName;
+    strcat(fileName, suffix);
+    return fileName;
+}
+
+static char *newfilenamemcopy(const char *preferredName, const char *suffix) {
+    if (preferredName == NULL) return NULL;
+    if (suffix == NULL) return NULL;
+    char *preferredNameTmp = (char *) calloc(strlen(preferredName) + 1, sizeof(uint8_t));
+    if (preferredNameTmp == NULL)
+        return NULL;
+    strcpy(preferredNameTmp, preferredName);
+    if (str_endswith(preferredNameTmp, suffix))
+        preferredNameTmp[strlen(preferredNameTmp) - strlen(suffix)] = '\0';
+    char *fileName = (char *) calloc(strlen(preferredNameTmp) + strlen(suffix) + 1 + 10, sizeof(uint8_t)); // 10: room for filenum to ensure new filename
+    if (fileName == NULL) {
+        free(preferredNameTmp);
+        return NULL;
+    }
     int num = 1;
-    sprintf(fileName, "%s.%s", preferredName, suffix);
+    sprintf(fileName, "%s%s", preferredNameTmp, suffix);
     while (fileExists(fileName)) {
-        sprintf(fileName, "%s-%d.%s", preferredName, num, suffix);
+        sprintf(fileName, "%s-%d%s", preferredNameTmp, num, suffix);
         num++;
     }
+    free(preferredNameTmp);
+    return fileName;
+}
+
+int saveFile(const char *preferredName, const char *suffix, const void *data, size_t datalen) {
+
+    if (data == NULL) return 1;
+    char *fileName = newfilenamemcopy(preferredName, suffix);
+    if (fileName == NULL) return 1;
+
     /* We should have a valid filename now, e.g. dumpdata-3.bin */
 
     /*Opening file for writing in binary mode*/
@@ -83,23 +117,15 @@ int saveFile(const char *preferredName, const char *suffix, const void *data, si
     return 0;
 }
 
-int saveFileEML(const char *preferredName, const char *suffix, uint8_t *data, size_t datalen, size_t blocksize) {
+int saveFileEML(const char *preferredName, uint8_t *data, size_t datalen, size_t blocksize) {
 
-    if (preferredName == NULL) return 1;
-    if (suffix == NULL) return 1;
     if (data == NULL) return 1;
+    char *fileName = newfilenamemcopy(preferredName, ".eml");
+    if (fileName == NULL) return 1;
 
     int retval = 0;
     int blocks = datalen / blocksize;
     uint16_t currblock = 1;
-    int size = sizeof(char) * (strlen(preferredName) + strlen(suffix) + 10);
-    char *fileName = calloc(size, sizeof(char));
-    int num = 1;
-    sprintf(fileName, "%s.%s", preferredName, suffix);
-    while (fileExists(fileName)) {
-        sprintf(fileName, "%s-%d.%s", preferredName, num, suffix);
-        num++;
-    }
 
     /* We should have a valid filename now, e.g. dumpdata-3.bin */
 
@@ -136,20 +162,13 @@ out:
     return retval;
 }
 
-int saveFileJSON(const char *preferredName, const char *suffix, JSONFileType ftype, uint8_t *data, size_t datalen) {
-    if (preferredName == NULL) return 1;
-    if (suffix == NULL) return 1;
+int saveFileJSON(const char *preferredName, JSONFileType ftype, uint8_t *data, size_t datalen) {
+
     if (data == NULL) return 1;
+    char *fileName = newfilenamemcopy(preferredName, ".json");
+    if (fileName == NULL) return 1;
 
     int retval = 0;
-    int size = sizeof(char) * (strlen(preferredName) + strlen(suffix) + 10);
-    char *fileName = calloc(size, sizeof(char));
-    int num = 1;
-    sprintf(fileName, "%s.%s", preferredName, suffix);
-    while (fileExists(fileName)) {
-        sprintf(fileName, "%s-%d.%s", preferredName, num, suffix);
-        num++;
-    }
 
     json_t *root = json_object();
     JsonSaveStr(root, "Created", "proxmark3");
@@ -274,14 +293,11 @@ out:
 
 int loadFile(const char *preferredName, const char *suffix, void *data, size_t maxdatalen, size_t *datalen) {
 
-    if (preferredName == NULL) return 1;
-    if (suffix == NULL) return 1;
     if (data == NULL) return 1;
+    char *fileName = filenamemcopy(preferredName, suffix);
+    if (fileName == NULL) return 1;
 
     int retval = 0;
-    int size = sizeof(char) * (strlen(preferredName) + strlen(suffix) + 10);
-    char *fileName = calloc(size, sizeof(char));
-    sprintf(fileName, "%s.%s", preferredName, suffix);
 
     FILE *f = fopen(fileName, "rb");
     if (!f) {
@@ -336,17 +352,14 @@ out:
     return retval;
 }
 
-int loadFileEML(const char *preferredName, const char *suffix, void *data, size_t *datalen) {
+int loadFileEML(const char *preferredName, void *data, size_t *datalen) {
 
-    if (preferredName == NULL) return 1;
-    if (suffix == NULL) return 1;
     if (data == NULL) return 1;
+    char *fileName = filenamemcopy(preferredName, ".eml");
+    if (fileName == NULL) return 1;
 
     size_t counter = 0;
     int retval = 0, hexlen = 0;
-    int size = sizeof(char) * (strlen(preferredName) + strlen(suffix) + 10);
-    char *fileName = calloc(size, sizeof(char));
-    sprintf(fileName, "%s.%s", preferredName, suffix);
 
     FILE *f = fopen(fileName, "r");
     if (!f) {
@@ -365,6 +378,8 @@ int loadFileEML(const char *preferredName, const char *suffix, void *data, size_
         memset(line, 0, sizeof(line));
 
         if (fgets(line, sizeof(line), f) == NULL) {
+            if (feof(f))
+                break;
             fclose(f);
             PrintAndLogEx(FAILED, "File reading error.");
             retval = 2;
@@ -391,20 +406,17 @@ out:
     return retval;
 }
 
-int loadFileJSON(const char *preferredName, const char *suffix, void *data, size_t maxdatalen, size_t *datalen) {
+int loadFileJSON(const char *preferredName, void *data, size_t maxdatalen, size_t *datalen) {
 
-    if (preferredName == NULL) return 1;
-    if (suffix == NULL) return 1;
     if (data == NULL) return 1;
+    char *fileName = filenamemcopy(preferredName, ".json");
+    if (fileName == NULL) return 1;
 
     *datalen = 0;
     json_t *root;
     json_error_t error;
 
     int retval = 0;
-    int size = sizeof(char) * (strlen(preferredName) + strlen(suffix) + 10);
-    char *fileName = calloc(size, sizeof(char));
-    sprintf(fileName, "%s.%s", preferredName, suffix);
 
     root = json_load_file(fileName, 0, &error);
     if (!root) {
@@ -500,11 +512,12 @@ out:
     return retval;
 }
 
-int loadFileDICTIONARY(const char *preferredName, const char *suffix, void *data, size_t *datalen, uint8_t keylen, uint16_t *keycnt) {
+int loadFileDICTIONARY(const char *preferredName, void *data, size_t *datalen, uint8_t keylen, uint16_t *keycnt) {
+
 
-    if (preferredName == NULL) return 1;
-    if (suffix == NULL) return 1;
     if (data == NULL) return 1;
+    char *fileName = filenamemcopy(preferredName, ".dic");
+    if (fileName == NULL) return 1;
 
     // t5577 == 4bytes
     // mifare == 6 bytes
@@ -521,9 +534,6 @@ int loadFileDICTIONARY(const char *preferredName, const char *suffix, void *data
 
     size_t counter = 0;
     int retval = 0;
-    int size = sizeof(char) * (strlen(preferredName) + strlen(suffix) + 10);
-    char *fileName = calloc(size, sizeof(char));
-    sprintf(fileName, "%s.%s", preferredName, suffix);
 
     FILE *f = fopen(fileName, "r");
     if (!f) {
diff --git a/client/loclass/fileutils.h b/client/loclass/fileutils.h
index 57dfbebc8..dae23a1b1 100644
--- a/client/loclass/fileutils.h
+++ b/client/loclass/fileutils.h
@@ -70,7 +70,7 @@ int fileExists(const char *filename);
  * E.g. dumpdata-15.txt
  *
  * @param preferredName
- * @param suffix the file suffix. Leave out the ".".
+ * @param suffix the file suffix. Including the ".".
  * @param data The binary data to write to the file
  * @param datalen the length of the data
  * @return 0 for ok, 1 for failz
@@ -83,13 +83,12 @@ int saveFile(const char *preferredName, const char *suffix, const void *data, si
  * E.g. dumpdata-15.txt
  *
  * @param preferredName
- * @param suffix the file suffix. Leave out the ".".
  * @param data The binary data to write to the file
  * @param datalen the length of the data
  * @param blocksize the length of one row
  * @return 0 for ok, 1 for failz
 */
-int saveFileEML(const char *preferredName, const char *suffix, uint8_t *data, size_t datalen, size_t blocksize);
+int saveFileEML(const char *preferredName, uint8_t *data, size_t datalen, size_t blocksize);
 
 /** STUB
  * @brief Utility function to save JSON data to a file. This method takes a preferred name, but if that
@@ -97,20 +96,19 @@ int saveFileEML(const char *preferredName, const char *suffix, uint8_t *data, si
  * E.g. dumpdata-15.json
  *
  * @param preferredName
- * @param suffix the file suffix. Leave out the ".".
  * @param ftype type of file.
  * @param data The binary data to write to the file
  * @param datalen the length of the data
  * @return 0 for ok, 1 for failz
  */
-int saveFileJSON(const char *preferredName, const char *suffix, JSONFileType ftype, uint8_t *data, size_t datalen);
+int saveFileJSON(const char *preferredName, JSONFileType ftype, uint8_t *data, size_t datalen);
 
 /** STUB
  * @brief Utility function to load data from a binary file. This method takes a preferred name.
  * E.g. dumpdata-15.bin
  *
  * @param preferredName
- * @param suffix the file suffix. Leave out the ".".
+ * @param suffix the file suffix. Including the ".".
  * @param data The data array to store the loaded bytes from file
  * @param maxdatalen the number of bytes that your data array has
  * @param datalen the number of bytes loaded from file
@@ -123,25 +121,23 @@ int loadFile(const char *preferredName, const char *suffix, void *data, size_t m
  * E.g. dumpdata-15.txt
  *
  * @param preferredName
- * @param suffix the file suffix. Leave out the ".".
  * @param data The data array to store the loaded bytes from file
  * @param datalen the number of bytes loaded from file
  * @return 0 for ok, 1 for failz
 */
-int loadFileEML(const char *preferredName, const char *suffix, void *data, size_t *datalen);
+int loadFileEML(const char *preferredName, void *data, size_t *datalen);
 
 /**
  * @brief  Utility function to load data from a JSON textfile. This method takes a preferred name.
  * E.g. dumpdata-15.json
  *
  * @param preferredName
- * @param suffix the file suffix. Leave out the ".".
  * @param data The data array to store the loaded bytes from file
  * @param maxdatalen maximum size of data array in bytes
  * @param datalen the number of bytes loaded from file
  * @return 0 for ok, 1 for failz
 */
-int loadFileJSON(const char *preferredName, const char *suffix, void *data, size_t maxdatalen, size_t *datalen);
+int loadFileJSON(const char *preferredName, void *data, size_t maxdatalen, size_t *datalen);
 
 
 /**
@@ -149,14 +145,13 @@ int loadFileJSON(const char *preferredName, const char *suffix, void *data, size
  * E.g. default_keys.dic
  *
  * @param preferredName
- * @param suffix the file suffix. Leave out the ".".
  * @param data The data array to store the loaded bytes from file
  * @param maxdatalen maximum size of data array in bytes
  * @param datalen the number of bytes loaded from file
  * @param keylen  the number of bytes a key per row is
  * @return 0 for ok, 1 for failz
 */
-int loadFileDICTIONARY(const char *preferredName, const char *suffix, void *data, size_t *datalen, uint8_t keylen, uint16_t *keycnt);
+int loadFileDICTIONARY(const char *preferredName, void *data, size_t *datalen, uint8_t keylen, uint16_t *keycnt);
 
 /**
  * @brief  Utility function to check and convert old mfu dump format to new
diff --git a/client/proxmark3.c b/client/proxmark3.c
index 35db95975..db8478d2e 100644
--- a/client/proxmark3.c
+++ b/client/proxmark3.c
@@ -97,7 +97,7 @@ main_loop(char *script_cmds_file, char *script_cmd, bool pm3_present) {
 
     // loops every time enter is pressed...
     while (1) {
-
+        bool printprompt = false;
         // this should hook up the PM3 again.
         /*
         if ( IsOffline() ) {
@@ -134,13 +134,13 @@ main_loop(char *script_cmds_file, char *script_cmd, bool pm3_present) {
                 strcleanrn(script_cmd_buf, sizeof(script_cmd_buf));
 
                 if ((cmd = strmcopy(script_cmd_buf)) != NULL)
-                    PrintAndLogEx(NORMAL, PROXPROMPT"%s\n", cmd);
+                    printprompt = true;
             }
         } else {
             // If there is a script command
             if (execCommand) {
                 if ((cmd = strmcopy(script_cmd)) != NULL)
-                    PrintAndLogEx(NORMAL, PROXPROMPT"%s", cmd);
+                    printprompt = true;
                 uint16_t len = strlen(script_cmd) + 1;
                 script_cmd += len;
                 if (script_cmd_len == len - 1)
@@ -165,7 +165,7 @@ main_loop(char *script_cmds_file, char *script_cmd, bool pm3_present) {
                     strcleanrn(script_cmd_buf, sizeof(script_cmd_buf));
 
                     if ((cmd = strmcopy(script_cmd_buf)) != NULL)
-                        PrintAndLogEx(NORMAL, PROXPROMPT"%s", cmd);
+                        printprompt = true;
 
                 } else {
                     cmd = readline(PROXPROMPT);
@@ -179,10 +179,20 @@ main_loop(char *script_cmds_file, char *script_cmd, bool pm3_present) {
 
             // rtrim
             size_t l = strlen(cmd);
-            if (l > 0 && isspace(cmd[l - 1]))
-                cmd[l - 1] = 0x00;
+            while (l > 0 && isspace(cmd[l - 1])) {
+                cmd[--l] = '\0';
+            }
+            // ltrim
+            size_t off=0;
+            while ((cmd[off] != '\0') && isspace(cmd[off]))
+                off++;
+            for (size_t i=0; i < strlen(cmd) - off; i++)
+                cmd[i] = cmd[i+off];
+            cmd[strlen(cmd) - off] = '\0';
 
-            if (cmd[0] != 0x00) {
+            if (cmd[0] != '\0') {
+                if (printprompt)
+                    PrintAndLogEx(NORMAL, PROXPROMPT"%s", cmd);
                 int ret = CommandReceived(cmd);
                 HIST_ENTRY *entry = history_get(history_length);
                 if ((!entry) || (strcmp(entry->line, cmd) != 0))
diff --git a/client/util.c b/client/util.c
index ce21ffbee..ddb38fc27 100644
--- a/client/util.c
+++ b/client/util.c
@@ -822,10 +822,23 @@ void str_lower(char *s) {
     for (size_t i = 0; i < strlen(s); i++)
         s[i] = tolower(s[i]);
 }
+
+// check for prefix in string
 bool str_startswith(const char *s,  const char *pre) {
     return strncmp(pre, s, strlen(pre)) == 0;
 }
 
+// check for suffix in string
+bool str_endswith(const char *s,  const char *suffix) {
+    size_t ls = strlen(s);
+    size_t lsuffix = strlen(suffix);
+    if (ls >= lsuffix)
+    {
+        return strncmp(suffix, s + (ls - lsuffix), lsuffix) == 0;
+    }
+    return false;
+}
+
 // Replace unprintable characters with a dot in char buffer
 void clean_ascii(unsigned char *buf, size_t len) {
     for (size_t i = 0; i < len; i++) {
@@ -848,7 +861,7 @@ void strcreplace(char *buf, size_t len, char from, char to) {
     }
 }
 
-char *strmcopy(char *buf) {
+char *strmcopy(const char *buf) {
     char *str = (char *) calloc(strlen(buf) + 1, sizeof(uint8_t));
     if (str != NULL) {
         memset(str, 0, strlen(buf) + 1);
diff --git a/client/util.h b/client/util.h
index b55cfc435..78ecf6b91 100644
--- a/client/util.h
+++ b/client/util.h
@@ -231,8 +231,9 @@ int num_CPUs(void); // number of logical CPUs
 
 void str_lower(char *s); // converts string to lower case
 bool str_startswith(const char *s,  const char *pre);  // check for prefix in string
+bool str_endswith(const char *s,  const char *suffix);    // check for suffix in string
 void clean_ascii(unsigned char *buf, size_t len);
 void strcleanrn(char *buf, size_t len);
 void strcreplace(char *buf, size_t len, char from, char to);
-char *strmcopy(char *buf);
+char *strmcopy(const char *buf);
 #endif
diff --git a/tools/mkversion.pl b/tools/mkversion.pl
index 715b8081c..aaac146f8 100644
--- a/tools/mkversion.pl
+++ b/tools/mkversion.pl
@@ -14,7 +14,7 @@ $ENV{'LC_ALL'} = "C";
 $ENV{'LANG'} = "C";
 
 # if you are making your own fork,  change this line to reflect your fork-name
-my $fullgitinfo = 'RRG';
+my $fullgitinfo = 'RRG/Iceman';
 my $ctime;
 # GIT status  0 = dirty,  1 = clean ,  2 = undecided
 my $clean = 2;