fix (and simplify) reading strings into waveform, aai, aao, lsi, lso

src/devaaiStream.c

@@ -116,17 +116,11 @@ static long readData(dbCommon *record, format_t *format)
                         if ((length = streamScanfN(record, format,
                             (char *)aai->bptr, aai->nelm)) == ERROR)
                         {
-                            memset(aai->bptr, 0, aai->nelm);
                             return ERROR;
                         }
-                        if (lval < (ssize_t)aai->nelm)
+                        if (length < (ssize_t)aai->nelm)
                         {
-                            memset(((char*)aai->bptr)+lval , 0, aai->nelm-lval);
-                            lval++;
-                        }
-                        else
-                        {
-                            ((char*)aai->bptr)[aai->nelm-1] = 0;
+                            ((char*)aai->bptr)[length] = 0;
                         }
                         aai->nord = (long)length;
                         return OK;

src/devaaoStream.c

@@ -108,22 +108,16 @@ static long readData(dbCommon *record, format_t *format)
                     case DBF_CHAR:
                     case DBF_UCHAR:
                     {
-						ssize_t length;
+                        ssize_t length;
                         aao->nord = 0;
                         if ((length = streamScanfN(record, format,
                             (char *)aao->bptr, aao->nelm)) == ERROR)
                         {
-                            memset(aao->bptr, 0, aao->nelm);
                             return ERROR;
                         }
                         if (length < (ssize_t)aao->nelm)
                         {
-                            memset(((char*)aao->bptr)+lval , 0, aao->nelm-lval);
-                            lval++;
-                        }
-                        else
-                        {
-                            ((char*)aao->bptr)[aao->nelm-1] = 0;
+                            ((char*)aao->bptr)[length] = 0;
                         }
                         aao->nord = (long)length;
                         goto end_no_check;

src/devlsiStream.c

@@ -23,30 +23,27 @@
 static long readData(dbCommon *record, format_t *format)
 {
     lsiRecord *lsi = (lsiRecord *)record;
+    ssize_t length;
 
-    if (format->type == DBF_STRING)
+    if (format->type != DBF_STRING) return ERROR;
+    if ((length = streamScanfN(record, format, lsi->val, (long)lsi->sizv)) == ERROR)
     {
-        long len;
-        if ((len = streamScanfN(record, format, lsi->val, lsi->sizv) == ERROR))
-        {
-            lsi->len = 0;
-            return ERROR;
-        }
-        lsi->len = len;
-        return OK;
+        return ERROR;
     }
-    return ERROR;
+    if (length < (ssize_t)lsi->sizv)
+    {
+        lsi->val[length] = 0;
+    }
+    lsi->len = length;
+    return OK;
 }
 
 static long writeData(dbCommon *record, format_t *format)
 {
     lsiRecord *lsi = (lsiRecord *)record;
 
-    if (format->type == DBF_STRING)
-    {
-        return streamPrintf(record, format, lsi->val);
-    }
-    return ERROR;
+    if (format->type != DBF_STRING) return ERROR;
+    return streamPrintf(record, format, lsi->val);
 }
 
 static long initRecord(dbCommon *record)

src/devlsoStream.c

@@ -24,17 +24,19 @@
 static long readData(dbCommon *record, format_t *format)
 {
     lsoRecord *lso = (lsoRecord *)record;
-    long len;
+    ssize_t length;
     unsigned short monitor_mask;
 
-    if (format->type != DBF_STRING)
-        return ERROR;
-    if ((len = streamScanfN(record, format, lso->val, lso->sizv) == ERROR))
+    if (format->type != DBF_STRING) return ERROR;
+    if ((length = streamScanfN(record, format, lso->val, lso->sizv)) == ERROR)
     {
-        lso->len = 0;
         return ERROR;
     }
-    lso->len = len;
+    if (length < (ssize_t)lso->sizv)
+    {
+        lso->val[length] = 0;
+    }
+    lso->len = length;
     if (record->pact) return OK;
     /* In @init handler, no processing, enforce monitor updates. */
     monitor_mask = recGblResetAlarms(record);
@@ -60,11 +62,8 @@ static long writeData(dbCommon *record, format_t *format)
 {
     lsoRecord *lso = (lsoRecord *)record;
 
-    if (format->type == DBF_STRING)
-    {
-        return streamPrintf(record, format, lso->val);
-    }
-    return ERROR;
+    if (format->type != DBF_STRING) return ERROR;
+    return streamPrintf(record, format, lso->val);
 }
 
 static long initRecord(dbCommon *record)

src/devwaveformStream.c

@@ -117,21 +117,15 @@ static long readData(dbCommon *record, format_t *format)
                         if ((length = streamScanfN(record, format,
                             (char *)wf->bptr, wf->nelm)) == ERROR)
                         {
-                            memset(wf->bptr, 0, wf->nelm);
                             return ERROR;
                         }
                         if (length < (ssize_t)wf->nelm)
                         {
-                            memset(((char*)wf->bptr)+lval , 0, wf->nelm-lval);
-                            lval++;
-                        }
-                        else
-                        {
-                            ((char*)wf->bptr)[wf->nelm-1] = 0;
+                            ((char*)wf->bptr)[length] = 0;
                         }
                         wf->nord = (long)length;
                         return OK;
-					}
+                    }
                     default:
                         errlogSevPrintf(errlogFatal,
                             "readData %s: can't convert from string to %s\n",