From 38c1ad30b2ad8d71f946045e803fd8c4aa5f2e29 Mon Sep 17 00:00:00 2001
From: PA4WDH
Date: Wed, 24 May 2023 10:22:28 +0200
Subject: Detect program name from argv[0]

---
 argparse.c        | 18 +++++++++++++++---
 cputemp2maxfreq.c |  3 ++-
 cputemp2maxfreq.h |  1 +
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/argparse.c b/argparse.c
index 888f445..7df1239 100644
--- a/argparse.c
+++ b/argparse.c
@@ -11,7 +11,7 @@ extern struct s_config config;
 void printhelp()
 {
  printf(
-  "Usage: cputemp2maxfreq <options>\n"
+  "Usage: %s <options>\n"
   "\n"
   "Options:\n"
   "-f <frequency> Fallback frequency in KHz, used when everything fails\n"
@@ -30,7 +30,7 @@ void printhelp()
   "               Default: %ld\n"
   "-t <number>    Temperature limit\n"
   "               Default: %ld\n",
-  config.fallback_freq,config.governor,config.temp_input,config.logger_name,
+  config.name,config.fallback_freq,config.governor,config.temp_input,config.logger_name,
   config.interval,config.freq_step,config.max_temp/1000
  );
 }
@@ -39,9 +39,19 @@ void argparse(int argc, char **argv)
 {
  int opt;
  struct s_config userconfig;
-
+ char *lastslash;
  DEBUG1_ARGPARSE("Started\n");
 
+ lastslash=strrchr(argv[0],'/');
+ if (lastslash==NULL)
+ {
+  lastslash=argv[0];
+ } else {
+  lastslash++;
+ }
+ strncpy(config.name,lastslash,sizeof(config.name));
+ DEBUG2_ARGPARSE("Detected program name %s\n",config.name);
+
 // Copy defaults
  memcpy(&userconfig,&config,sizeof(struct s_config));
 
@@ -85,6 +95,7 @@ void argparse(int argc, char **argv)
  }
 
 // Change the logger function pointer
+ DEBUG1_ARGPARSE("Logger is set to %s\n",userconfig.logger_name);
  if (strcmp(userconfig.logger_name,"none")==0) userconfig.logger=&logger_none;
  else if (strcmp(userconfig.logger_name,"stdout")==0) userconfig.logger=&logger_stdout;
  else if (strcmp(userconfig.logger_name,"syslog")==0) userconfig.logger=&logger_syslog;
@@ -93,6 +104,7 @@ void argparse(int argc, char **argv)
   config.logger("Invalid value for logger, exiting");
   exit(1);
  }
+ DEBUG2_ARGPARSE("Logger pointer is %p\n",userconfig.logger);
 
 // Copy modified config to global config
  memcpy(&config,&userconfig,sizeof(struct s_config));
diff --git a/cputemp2maxfreq.c b/cputemp2maxfreq.c
index dd58e16..826655a 100644
--- a/cputemp2maxfreq.c
+++ b/cputemp2maxfreq.c
@@ -15,6 +15,7 @@
 
 // Set default config
 struct s_config config={
+ "",             // Name of this program, set by argparse
  "conservative", // Governor
  70000,          // Temperature
  "/sys/devices/virtual/thermal/thermal_zone0/temp", // Temperature input
@@ -39,7 +40,7 @@ int main(int argc,char **argv)
  long int newfreq;
 
  argparse(argc,argv);
- config.logger("Version %s, buildtime %s %s",version(),__DATE__,__TIME__);
+ config.logger("%s version %s, buildtime %s %s",config.name,version(),__DATE__,__TIME__);
 
 // Log configuration
  config.logger("Configuration:");
diff --git a/cputemp2maxfreq.h b/cputemp2maxfreq.h
index 0e4c424..6eb5726 100644
--- a/cputemp2maxfreq.h
+++ b/cputemp2maxfreq.h
@@ -26,6 +26,7 @@ struct s_cpudata {
 };
 
 struct s_config {
+ char     name[255];       // Name of this program
  char     governor[255];   // The governor to use
  long int max_temp;        // The target temperature
  char     temp_input[255]; // Input file to read the temperature
-- 
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