Wrote lots of common functions

Wrote get_current_date_time function

Wrote get_extension function

Wrote basename function

2 files changed, 108 insertions, 0 deletions

diff --git a/src/common.c b/src/common.c
index 81f5641..55149a7 100644
--- a/src/common.c
+++ b/src/common.c
@@ -73,3 +73,104 @@ int itoc(int num, char* out) {
 
   return out_count;
 }
+
+
+/**
+ * Returns the current localtime in format YYYYMMDD.HHmmss. Useful for "random"
+ * non-conflicting filenames.
+ *
+ * @param date Output variable for the date string.  The output variable must
+ *             have space for the date to be stored, otherwise unexpected
+ *             behavior may occur.
+ */
+void get_current_date_time(char* date) {
+  time_t rawtime;
+  time(&rawtime);
+  struct tm* now = localtime(&rawtime);
+
+  // Date
+  // Year
+  int year = now->tm_year + 1900;
+  char c_year[5];
+  itoc(year, c_year);
+  strcpy(date, c_year);
+
+  // Month
+  int mon = now->tm_mon + 1;
+  char c_mon[3];
+  itoc(mon, c_mon);
+  if(mon < 10) { strcat(date, "0"); }
+  strcat(date, c_mon);
+
+  // Day
+  int day = now->tm_mday;
+  char c_day[3];
+  if(day < 10) { strcat(date, "0"); }
+  strcat(date, c_day);
+
+  // A delimiter to make it easier for humans to read.
+  strcat(date, ".");
+
+  // Time
+  // Hour
+  int hour = now->tm_hour;
+  char c_hour[3];
+  itoc(hour, c_hour);
+  if(hour < 10) { strcat(date, "0"); }
+  strcat(date, c_hour);
+ 
+  // Minute
+  int min = now->tm_min;
+  char c_min[3];
+  itoc(min, c_min);
+  if(min < 10) { strcat(date, "0"); }
+  strcat(date, c_min);
+
+  // Second
+  int sec = now->tm_sec;
+  char c_sec[3];
+  itoc(sec, c_sec);
+  if(sec < 10) { strcat(date, "0"); }
+  strcat(date, c_sec);
+}
+
+
+/**
+ * TODO: Write this function description
+ *
+ * @return int Extension char length
+ */
+int get_extension(char* path, char* extension) {
+  int path_len = strlen(path);
+  // Start from the right and move left
+  for(int i = path_len; i > 0; i--) {
+    // Copy if an extension delimiter (a period) is found
+    if(path[i] == '.') {
+      int ext_len = path_len - i - 1;
+      strncpy(extension, &path[i+1], ext_len);
+      return ext_len;
+    }
+  }
+  return -1;
+}
+
+
+/**
+ * Yup, wrote my own.
+ * TODO: Make this work with escaped path delimiters
+ * TODO: Write this function description
+ *
+ * @return int Basename path length
+ */
+int basename(char* path, char* out) {
+  int path_len = strlen(path);
+  // Start from the right and move left
+  for(int i = path_len; i > 0; i--) {
+    // Copy if an extension delimiter (a period) is found
+    if(path[i] == '/') {
+      strncpy(out, path, i);
+      return i;
+    }
+  }
+  return -1;
+}
diff --git a/src/common.h b/src/common.h
index 89b9026..6fb5ed1 100644
--- a/src/common.h
+++ b/src/common.h
@@ -17,6 +17,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 
 #ifndef noteless_common
 #define noteless_common
@@ -25,4 +26,10 @@ void get_user_editor(char*);
 
 int itoc(int, char*);
 
+void get_current_date_time(char*);
+
+int get_extension(char*, char*);
+
+int basename(char*, char*);
+
 #endif