Initial commit of strarray code

This is simply memory management code for dynamically growing string
arrays. This will make key management easier.

3 files changed, 106 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 1f1175c..71f3e4d 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,7 @@ CCOPTS = --std=gnu99 -Wall
 
 all:
 	if [ ! -d obj ]; then mkdir obj; fi
+	cc $(CCOPTS) $(DBG) -c src/strarray.c -o obj/strarray.o
 	cc $(CCOPTS) $(DBG) -lgpgme -c src/gpg.c -o obj/gpg.o
 	cc $(CCOPTS) $(DBG) -lgpgme obj/*.o src/main.c -o $(out)
 
diff --git a/src/strarray.c b/src/strarray.c
new file mode 100644
index 0000000..12ddbf8
--- /dev/null
+++ b/src/strarray.c
@@ -0,0 +1,78 @@
+// GPGEdit edits GPG encrypted files
+// Copyright (C) 2018  Aaron Ball <nullspoon@oper.io>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#include "strarray.h"
+
+
+// strarray_new:
+// Pretty much useless constructor. Here mostly for consistency. This can
+// easily be replaced with your own malloc statement provided index 0 is set to
+// NULL.
+//
+// NOTE: If not using this, initialized memory *must* be allocated in the heap,
+//       as growing the string array requires reallocating the memory, which
+//       can't be done in the stack.
+char** strarray_new() {
+  char** out = malloc(sizeof(char*));
+  out[0] = NULL;
+  return out;
+}
+
+
+// strarray_add:
+// Dynamically grows a string array (pointer to char array containing pointers
+// to char arrays - sorry). Reallocates storage for the original array plus
+// room for one additional pointer. Once data is copied in, the source array
+// pointer is updated to point to the new storage.
+//
+// @strorig Source string array pointer
+// @newstr  New string to add to the string array.
+void strarray_add(char*** strorig, char* newstr) {
+  int i = 0;
+  char** newstrarr;
+
+  // Count the number of existing strings
+  while(*strorig[i] != NULL)
+    i++;
+
+  // Reallocate old array + 1
+  newstrarr = (char**) realloc(*strorig, sizeof(char*) * (i + 1));
+
+  // Append new string to the array
+  newstrarr[i] = malloc(strlen(newstr) + 1);
+  strcpy(newstrarr[i], newstr);
+  // Don't forget the null terminator!
+  newstrarr[i + 1] = NULL;
+
+  // Repoint strorig to newstrarr memory
+  *strorig = newstrarr;
+}
+
+
+// strarray_release:
+// Destructor for a string array. Frees each item in the array before freeing
+// the array itself.
+//
+// @strarray Array to free
+void strarray_release(char*** strarray) {
+  int i = 0;
+
+  while(*strarray[i] != NULL) {
+    free(*strarray[i]);
+    i++;
+  }
+  free(*strarray);
+}
+
diff --git a/src/strarray.h b/src/strarray.h
new file mode 100644
index 0000000..69d91a4
--- /dev/null
+++ b/src/strarray.h
@@ -0,0 +1,27 @@
+// GPGEdit edits GPG encrypted files
+// Copyright (C) 2018  Aaron Ball <nullspoon@oper.io>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#ifndef GPGEDIT_STRARRAY_H
+#define GPGEDIT_STRARRAY_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char** strarray_new();
+void strarray_add(char***, char*);
+void strarray_release(char***);
+
+#endif