Replace some magic numbers with a #define.

[libsigrok.git] / src / hardware / norma-dmm / protocol.c

diff --git a/src/hardware/norma-dmm/protocol.c b/src/hardware/norma-dmm/protocol.c
index 28f733c60ff5605570c213c22aaa64f51a7e82ad..2c700ad5702eb8b42a392aa0ec8ba4ec17fd623c 100644 (file)
--- a/src/hardware/norma-dmm/protocol.c
+++ b/src/hardware/norma-dmm/protocol.c
@@ -24,6 +24,8 @@
 
 #include "protocol.h"
 
+#define LINE_LENGTH 20
+
 SR_PRIV const struct nmadmm_req nmadmm_requests[] = {
        { NMADMM_REQ_IDN, "IDN?" },
        { NMADMM_REQ_IDN, "STATUS?" },
@@ -92,19 +94,19 @@ static void nma_process_line(const struct sr_dev_inst *sdi)
 
        devc = sdi->priv;
 
-       devc->buf[20] = '\0';
+       devc->buf[LINE_LENGTH] = '\0';
 
        sr_spew("Received line '%s'.", devc->buf);
 
        /* Check line. */
-       if (strlen((const char *)devc->buf) != 20) {
+       if (strlen((const char *)devc->buf) != LINE_LENGTH) {
                sr_err("line: Invalid status '%s', must be 20 hex digits.",
                       devc->buf);
                devc->buflen = 0;
                return;
        }
 
-       for (pos = 0; pos < 20; pos++) {
+       for (pos = 0; pos < LINE_LENGTH; pos++) {
                if (!isxdigit(devc->buf[pos])) {
                        sr_err("line: Expected hex digit in '%s' at pos %d!",
                                devc->buf, pos);