pre-pre alpha of Network_CAN_clientserver

Network_CAN_clientserver/parsecanmsgs.c

@@ -0,0 +1,91 @@
+/*
+ * This file is part of the canserver project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <usefull_macros.h>
+
+#include "parsecanmsgs.h"
+
+
+/**
+ * @brief parseCANstr - parser of string like "timestamp #ID [data0 data1 ...]"
+ * @param str - input string
+ * @param msg - message to fill
+ * @return FALSE if given string isn't CAN message
+ */
+int parseCANstr(const char *str, CAN_message *msg){
+    if(!str || !msg) return FALSE;
+    const char *IDstart = strchr(str, '#');
+    if(!IDstart) return FALSE;
+    ++IDstart;
+    msg->timestamp = atoi(str);
+    DBG("Timestamp: %u", msg->timestamp);
+    unsigned bytes[9];
+    int N = sscanf(IDstart, "%x %x %x %x %x %x %x %x %x",
+            &bytes[0], &bytes[1], &bytes[2], &bytes[3], &bytes[4], &bytes[5], &bytes[6], &bytes[7], &bytes[8]);
+    if(N < 1) return FALSE; // where's ID?
+    DBG("ID=%u", bytes[0]);
+    msg->length = N - 1;
+    msg->ID = bytes[0];
+    for(int i = 0; i < msg->length; ++i) msg->data[i] = bytes[i + 1];
+    DBG("length: %u", msg->length);
+    return TRUE;
+}
+
+// return result of snprintf
+int formCANmsg(CAN_message *msg, char *buf, int buflen){
+    if(!msg || !buf || buflen < 8) return 0;
+    DBG("msg ID=%u, len=%u", msg->ID, msg->length);
+    int L = snprintf(buf, buflen, "s %u ", msg->ID);
+    for(int i = 0; i < msg->length && L < buflen; ++i)
+        L += snprintf(buf + L, buflen - L, "%u ", msg->data[i]);
+    if(L >= buflen){
+        WARNX("buffer overflow");
+        return 0;
+    }
+    L += snprintf(buf + L, buflen - L, "\n");
+    DBG("convert CAN message to %d symbols: _%s_", L, buf);
+    return L;
+}
+
+// fill command and parameter into message
+// !!!!! msg->ID should be set by user !!!!!
+static int fillcmd(int cancmd, uint8_t par, CAN_message *msg){
+    if(!msg || cancmd > 0xffff) return FALSE;
+    MSGP_SET_CMD(msg, cancmd);
+    MSGP_SET_PARNO(msg, par);
+    MSGP_SET_ERR(msg, 0);
+    msg->length = 4;
+    return TRUE;
+}
+
+int CANu32setter(int cancmd, uint8_t par, uint32_t data, CAN_message *msg){
+    if(!msg) return FALSE;
+    par |= SETTER_FLAG;
+    if(!fillcmd(cancmd, par, msg)) return FALSE;
+    MSGP_SET_U32(msg, data);
+    msg->length = 8;
+    return TRUE;
+}
+
+int CANu32getter(int cancmd, uint8_t par, CAN_message *msg){
+    if(!msg) return FALSE;
+    if(!fillcmd(cancmd,  par, msg)) return FALSE;
+    return TRUE;
+}