2 files changed, 76 insertions, 0 deletions
diff --git a/xstring.c b/xstring.c
new file mode 100644
index 0000000..98d91f9
--- /dev/null
+++ b/xstring.c
@@ -0,0 +1,59 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "xstring.h"
+
+string *string_alloc(const char *text)
+{
+	string *str = malloc(sizeof(string));
+	if(text) {
+		int length = strlen(text);
+		str->s = malloc(sizeof(char) * (length + 1));
+		strcpy(str->s, text);
+		str->capacity = length;
+		str->len = length;
+	}
+	else {
+		str->s = malloc(sizeof(char) * (INIT_LEN_STRING + 1));
+		str->len = 0;
+		str->capacity = INIT_LEN_STRING;
+		str->s[0] = '\0';
+	}
+	return str;
+}
+
+void string_release(string *str)
+{
+	if(str->s) {
+		free(str->s);
+		str->s = NULL;
+	}
+	free(str);
+}
+
+void string_reset(string *str)
+{
+	if(str->s) {
+		str->s[0] = '\0';
+		str->len = 0;
+	}
+}
+
+void string_addch(string *str, int ch)
+{
+	if(str->capacity <= (str->len + 1)) {
+		int i;
+		int updated_cap = str->capacity + INIT_LEN_STRING;
+		char *tmp_s = str->s;
+		str->s = malloc(sizeof(char) * (updated_cap + 1));
+		for(i = 0; i < updated_cap; i++)
+			str->s[i] = (i >= str->capacity) ? '\0' : tmp_s[i];
+
+		str->capacity = updated_cap;
+		free(tmp_s);
+	}
+
+	str->s[str->len] = ch;
+	str->len++;
+	str->s[str->len] = '\0';
+}
diff --git a/xstring.h b/xstring.h
new file mode 100644
index 0000000..3e98ec9
--- /dev/null
+++ b/xstring.h
@@ -0,0 +1,17 @@
+#ifndef CTIMELINE_XSTRING_H
+#define CTIMELINE_XSTRING_H
+
+#define INIT_LEN_STRING 32
+
+typedef struct tag_string {
+	char *s;
+	int len;
+	int capacity;
+} string;
+
+string *string_alloc(const char *text);
+void string_release(string *str);
+void string_reset(string *str);
+void string_addch(string *str, int ch);
+
+#endif /* CTIMELINE_XSTRING_H */