Add flag to print temperature in Farenheit

Author: t-nelson

src/main.c

@@ -207,7 +207,8 @@ void fill_output()
 
 static const struct option  longopts[]  =
 {
-    { "help",     no_argument,        NULL, 'h' }
+    { "farenheit",  no_argument,        NULL, 'f' }
+  , { "help",       no_argument,        NULL, 'h' }
   , { "nocolor",  no_argument,        NULL, 'n' }
   , { "reverse",  no_argument,        NULL, 'r' }
   , { "sort",     required_argument,  NULL, 's' }
@@ -246,6 +247,7 @@ static void print_help(const char* argv0)
   printf("Usage: %s [OPTION]...\n\n", progname);
   printf(
       "Mandatory arguments to long options are also mandatory for short options.\n"
+      " -f  --farenheit   Use Farenheit temperatur unit\n"
       " -h  --help        Display this help message.\n"
       " -n  --nocolor     Do not display color codes.\n"
       " -r  --reverse     Reverse sort order.\n"
@@ -265,10 +267,13 @@ int main(int argc, char* argv[])
   int         sort_dir  = 1;
   int         opt;
 
-  while (-1 != (opt = getopt_long(argc, argv, "hnrs:", longopts, NULL)))
+  while (-1 != (opt = getopt_long(argc, argv, "fhnrs:", longopts, NULL)))
   {
     switch (opt)
     {
+      case 'f':
+        output_fmt_temp_unit  = TEMP_UNIT_FARENHEIT;
+        break;
       case 'r':
         sort_dir = -1;
         break;

src/output_fmt.c

@@ -236,9 +236,18 @@ temp_conv_C(
   return temp_K - 273.0;
 }
 
+double
+temp_conv_F(
+  double temp_K
+)
+{
+  return (((temp_K - 273.0) * 9.0) / 5.0) + 32.0;
+}
+
 static const struct temp_param  temp_params[_TEMP_UNIT_MAX] =
 {
     [TEMP_UNIT_CELCIUS]   = { "C",  temp_conv_C,  40.0,   49.0  }
+  , [TEMP_UNIT_FARENHEIT] = { "F",  temp_conv_F,  104.0,  120.2 }
 };
 
 enum TEMP_UNIT  output_fmt_temp_unit  = TEMP_UNIT_CELCIUS;

src/output_fmt.h

@@ -24,6 +24,7 @@ enum TEMP_UNIT
 {
     _TEMP_UNIT_FIRST    = 0
   , TEMP_UNIT_CELCIUS   = _TEMP_UNIT_FIRST
+  , TEMP_UNIT_FARENHEIT
   , _TEMP_UNIT_MAX
 };