added argc check and help message

src/homemade_speedstep.c

@@ -27,13 +27,50 @@ int getfilec(FILE *file, char arr[]){
   return i;
 }
 
-int main(){
+int powerof(int base, int exponent){
+  int i, result;
+  if (exponent==0){
+    return result=1;
+  }
+  result=base;
+  for(i=0; i<exponent-1; i++){
+    result*=base;
+  }
+  return result;
+}
+
+int stringtoint(char number[], int length){
+  int j, result;
+  result=0;
+  j=0;
+  while(length-1>=0){
+    result+=((int)number[length-1]-'0')*(powerof(10,j));
+    j++;
+    length--;
+  }
+  return result;
+}
+
+int main(int argc, char** argv){
+  if (argc == 1 || comparestrings(argv[1], "-h") == 0
+      || comparestrings(argv[1], "--help") == 0){
+    printf("usage: homemade_speedstep <max temp> <min temp>\n");
+    printf("       homemade_speedstep [-h | --help]\n");
+    printf("       -h | --help   prints out this help message\n");
+    return 0;
+  }
+  if (argc!=3){
+    printf("error: wrong ammount of arguments given\n");
+    printf("       see homemade_speedstep --help\n");
+    return 1;
+  }
   char gov[20];
   FILE *govfile = fopen(CURGOV, "r");
   getfilec(govfile, gov);
   if (comparestrings(gov, "userspace\n") != 0){
     printf("error: userspace governor not set\n");
-    return 1;
+    fclose(govfile);
+    return 2;
   }
   FILE *freqsfile = fopen(FREQS, "r");
   FILE *curmaxfile = fopen(MAXSPDPATH, "r");