Logging: Filter out unwanted newlines

055804e89ea0f6b4145040a0eeb2f4e6951692fe changed the outgoing
SCPI message termination by always adding a newline. This results
in the following log output:

sr: [00:00.003102] scpi: Opening VXI device vxi/192.168.178.43.
sr: [00:00.005648] scpi_vxi: Successfully sent SCPI command: '*IDN?
'.
sr: [00:00.005931] scpi: Got response: 'YOKOGAWA,710130,91HC30402,F3.73', length 31.

This patch restores the previous unterminated SCPI message logging:

sr: [00:00.005462] scpi: Opening VXI device vxi/192.168.178.43.
sr: [00:00.007515] scpi_vxi: Successfully sent SCPI command: '*IDN?'.
sr: [00:00.007860] scpi: Got response: 'YOKOGAWA,710130,91HC30402,F3.73', length 31.

As it's located in the general logging mechanism, we deal with any
additional (and unwanted) newlines this way.

diff --git a/src/log.c b/src/log.c
index 3d65cc4e20bb755d7550f87b85959990976916c9..3cbbe17be537d2776c207f2de5a6f65327a70c36 100644 (file)
--- a/src/log.c
+++ b/src/log.c
@@ -163,7 +163,8 @@ static int sr_logv(void *cb_data, int loglevel, const char *format, va_list args
 {
        uint64_t elapsed_us, minutes;
        unsigned int rest_us, seconds, microseconds;
-       int ret;
+       char *raw_output, *output;
+       int raw_len, raw_idx, idx, ret;
 
        /* This specific log callback doesn't need the void pointer data. */
        (void)cb_data;
@@ -186,10 +187,25 @@ static int sr_logv(void *cb_data, int loglevel, const char *format, va_list args
                ret = fputs("sr: ", stderr);
        }
 
-       if (ret < 0 || g_vfprintf(stderr, format, args) < 0
-                       || putc('\n', stderr) < 0)
+       if (ret < 0 || (raw_len = g_vasprintf(&raw_output, format, args)) < 0)
                return SR_ERR;
 
+       output = g_malloc0(raw_len + 1);
+
+       /* Copy the string without any unwanted newlines. */
+       raw_idx = idx = 0;
+       while (raw_idx < raw_len) {
+               if (raw_output[raw_idx] != '\n') {
+                       output[idx] = raw_output[raw_idx];
+                       idx++;
+               }
+               raw_idx++;
+       }
+
+       g_fprintf(stderr, "%s\n", output);
+       g_free(raw_output);
+       g_free(output);
+
        return SR_OK;
 }