Add base extlib

3 files changed, 209 insertions, 0 deletions

diff --git a/src/extlib.c b/src/extlib.c
new file mode 100644
index 0000000..ee20d3e
--- /dev/null
+++ b/src/extlib.c
@@ -0,0 +1,58 @@
+/* extlib.c
+ *
+ * Copyright 2024 axtlos <axtlos@disroot.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * 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 Lesser General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGPL-3.0-only
+ */
+
+#include "extlib.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#undef free
+#undef malloc
+
+void
+free_secure(void *__ptr, size_t ptrlen)
+{
+  memset (__ptr, 0, ptrlen);
+  free (__ptr);
+  return;
+}
+
+void *
+malloc_secure (size_t len)
+{
+  void *mem = malloc (len);
+  memset (mem, 0, len);
+  return mem;
+}
+
+void
+fcopy(FILE *f1, FILE *f2)
+{
+  char buffer[BUFSIZ];
+  size_t n;
+
+  while ((n = fread (buffer, sizeof (char), sizeof (buffer), f1)) > 0)
+  {
+    if (fwrite (buffer, sizeof (char), n, f2) != n) {
+      fprintf (stderr, "Failed to copy data");
+      return;
+    }
+  }
+}
diff --git a/src/extlib.h b/src/extlib.h
new file mode 100644
index 0000000..1948352
--- /dev/null
+++ b/src/extlib.h
@@ -0,0 +1,46 @@
+/* extlib.h
+ *
+ * Copyright 2024 axtlos <axtlos@disroot.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * 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 Lesser General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGPL-3.0-only
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#define free(x) error - use free_secure
+#define malloc(x) error - use malloc_secure
+
+/// Automatically zero out a pointer before freeing it
+void free_secure (void *__ptr, size_t ptrlen);
+
+/// Automatically initialise the allocated memory with zeros
+void *malloc_secure (size_t len);
+
+/// Copy the data of one filestream to another
+void fcopy(FILE *f1, FILE *f2);
+
+/// Convert a string to lowercase
+char *strlwr(char *s);
+
+/// Convert a string to uppercase
+char *strupr(char *s);
+
+/// Trim spaces from a string
+char *trim (char *s);
+
+/// Match string old and replace it with string replace
+char *replace_str (char *s, char *old, char *replace);
diff --git a/src/extstring.c b/src/extstring.c
new file mode 100644
index 0000000..5867fc5
--- /dev/null
+++ b/src/extstring.c
@@ -0,0 +1,105 @@
+/* extstring.c
+ *
+ * Copyright 2024 axtlos <axtlos@disroot.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * 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 Lesser General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGPL-3.0-only
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include "extlib.h"
+
+char *
+strlwr (char *s)
+{
+  unsigned char *p = (unsigned char *) s;
+
+  while (*p) {
+     *p = tolower ((unsigned char)*p);
+      p++;
+  }
+
+  return s;
+}
+
+char *
+strupr (char *s)
+{
+  unsigned char *p = (unsigned char *) s;
+
+  while (*p) {
+     *p = toupper ((unsigned char)*p);
+      p++;
+  }
+
+  return s;
+
+}
+
+char *
+trim (char *s)
+{
+  char *result = strdup (s);
+  char *end;
+
+  while (isspace ((unsigned char)*result))
+    result++;
+
+  if (*result == 0)
+    return result;
+
+  end = result + strlen (result) - 1;
+  while (end > result && isspace ((unsigned char)*end))
+    end--;
+
+  end[1] = '\0';
+
+  return result;
+}
+
+char *
+replace_str (char *s,
+	    char *old,
+	    char *replace)
+{
+  char* result;
+  int i, cnt = 0;
+  size_t new_size = strlen (replace);
+  size_t old_size = strlen (old);
+
+  for (i = 0; s[i] != '\0'; i++) {
+    if (strstr (&s[i], old) == &s[i]) {
+      cnt++;
+      i += old_size - 1;
+    }
+  }
+
+  result = (char*)malloc_secure (i + cnt * (new_size - old_size) + 1);
+
+  i = 0;
+  while (*s) {
+    if (strstr (s, old) == s) {
+      strcpy (&result[i], replace);
+      i += new_size;
+      s += old_size;
+    }
+    else
+      result[i++] = *s++;
+  }
+
+  result[i] = '\0';
+  return result;
+};