Add argument parsing and validation

1 files changed, 79 insertions, 0 deletions

diff --git a/argparse.c b/argparse.c
new file mode 100644
index 0000000..01b6c57
--- /dev/null
+++ b/argparse.c
@@ -0,0 +1,79 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include "cputemp2maxfreq.h"
+#include "debug.h"
+
+extern struct s_config config;
+
+void printhelp()
+{
+ printf(
+  "Usage: cputemp2maxfreq <options>\n"
+  "\n"
+  "Options:\n"
+  "-f <frequency> Fallback frequency in KHz, used when everything fails\n"
+  "               Default: %ld\n"
+  "-g <governor>  cpufreq governor to use, use \"keep\" to keep current governor\n"
+  "               Default: %s\n"
+  "-h             Display this help text\n"
+  "-i <file>      Input for temperature readout, usually somewhere in sysfs\n"
+  "               Default: %s\n"
+  "-p <time>      Poll interval in seconds\n"
+  "               Default: %d\n"
+  "-s <step>      Step size in Khz when increasing/decreasing CPU speed\n"
+  "               Default: %ld\n"
+  "-t <number>    Temperature limit\n"
+  "               Default: %ld\n",
+  config.fallback_freq,config.governor,config.temp_input,config.interval,
+  config.freq_step,config.max_temp/1000
+ );
+}
+
+void argparse(int argc, char **argv)
+{
+ int opt;
+ struct s_config userconfig;
+
+ DEBUG1_ARGPARSE("Started\n");
+
+// Copy defaults
+ memcpy(&userconfig,&config,sizeof(struct s_config));
+
+// Parse options
+ while((opt=getopt(argc,argv,"f:g:hi:p:s:t:"))!=-1)
+ {
+  DEBUG1_ARGPARSE("Argument: %c Value: %s\n",opt,optarg);
+  switch(opt)
+  {
+   case 'f':
+    userconfig.fallback_freq=strtoll(optarg,NULL,10);
+    break;
+   case 'g':
+    strncpy(userconfig.governor,optarg,sizeof(userconfig.governor));
+    break;
+   case 'h':
+    printhelp();
+    exit(1);
+   case 'i':
+    strncpy(userconfig.temp_input,optarg,sizeof(userconfig.temp_input));
+    break;
+   case 'p':
+    userconfig.interval=strtoll(optarg,NULL,10);
+    break;
+   case 's':
+    userconfig.freq_step=strtoll(optarg,NULL,10);
+    break;
+   case 't':
+    userconfig.max_temp=strtoll(optarg,NULL,10)*1000;
+    break;
+   default:
+    printhelp();
+    exit(1);
+  }
+ }
+
+// Copy modified config to global config
+ memcpy(&config,&userconfig,sizeof(struct s_config));
+}