C: add pure_getline.*

c-programming/pure_getline.c

@@ -0,0 +1,48 @@
+/*
+ * pure_getline.c
+ *
+ * Author: Intel A80486DX2-66
+ * License: Creative Commons Zero 1.0 Universal
+*/
+
+#include "pure_getline.h"
+
+bool pure_getline(char** output) {
+	/*
+	 * return value:
+	 * 	true: no errors
+	 * 	false: an error occurred, see errno
+	 */
+
+	char* line = NULL;
+	size_t len = 0;
+	int character;
+	bool past_first_time = false;
+
+	while ((character = fgetc(stdin)) != EOF) {
+		if (past_first_time && len == 0) { // check for integer overflow
+			errno = ERANGE;
+			*output = NULL;
+			return false;
+		}
+
+		char* new_line = realloc(line, (len + 1) * sizeof(char));
+
+		if (new_line == NULL) {
+			*output = line;
+			return false;
+		}
+
+		line = new_line;
+
+		if (character == '\n') {
+			line[len] = '\0';
+			break;
+		}
+		line[len++] = character;
+		past_first_time = true;
+	}
+
+	*output = line;
+	return true;
+}

c-programming/pure_getline.h

@@ -0,0 +1,18 @@
+/*
+ * pure_getline.h
+ *
+ * Author: Intel A80486DX2-66
+ * License: Creative Commons Zero 1.0 Universal
+ */
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef _PURE_GETLINE_H
+#define _PURE_GETLINE_H
+
+bool pure_getline(char** output);
+
+#endif /* _PURE_GETLINE_H */