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Author: Jigsy1

C/brute/brute_append.c

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+/*
+ * brute.c (Rev.2) - APPEND VERSION - by Jigsy (https://github.com/Jigsy1) released under the Unlicense.
+ *
+ * Just a demo of looping through letter(s). A->B->C->...->AA->BA->...->...->XZZZ->YZZZ->ZZZZ->...
+ *
+ * Compiled on Windows 8.1 using TCC available from: https://bellard.org/tcc/
+ *
+ * How to:
+ * ----------
+ * ...> tcc -c brute.c
+ * ...> tcc -run brute.o
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+/* START OF PROTOTYPES */
+
+void rotate(int index);
+
+/* END OF PROTOTYPES */
+
+const char CHAR_MAP[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+#define MAPSIZE (sizeof(CHAR_MAP)/sizeof(CHAR_MAP[0]))
+char STRING[MAPSIZE+1] = "A";		// +1 should account for \0.
+const char END_STRING[] = "ZZZZ";	// Make sure this is the last character of CHAR_MAP * strlen(STRING)!
+
+void rotate(int index) {
+	char *tempChar;
+	int tempIndex;
+	tempChar = strchr(CHAR_MAP, STRING[index]);
+	tempIndex = (int) (tempChar - CHAR_MAP);
+	// `-> Find the position of the current character in CHAR_MAP.
+	STRING[index] = CHAR_MAP[(tempIndex + 1) % strlen(CHAR_MAP)];
+	if (CHAR_MAP[tempIndex] == CHAR_MAP[(strlen(CHAR_MAP) - 1)]) {
+		STRING[index] = CHAR_MAP[0];
+		if ((index + 1) == strlen(STRING)) {
+			STRING[(index + 1)] = CHAR_MAP[0];
+			return;
+		}
+		rotate((index + 1));
+	}
+}
+int main(void) {
+	int index = 0;
+	unsigned long int thisChar = 0;
+	for (;;) {
+		printf("%s\n", STRING);
+		if (strncmp(STRING, END_STRING, strlen(END_STRING)) == 0) {
+			// `-> STRING matches END_STRING so end here.
+			break;
+		}
+		if (STRING[index] == CHAR_MAP[(strlen(CHAR_MAP) - 1)]) {
+			if ((index + 1) == strlen(STRING)) {
+				STRING[(index + 1)] = CHAR_MAP[0];
+			}
+			else {
+				rotate((index + 1));
+			}
+		}
+		thisChar += 1;
+		STRING[index] = CHAR_MAP[thisChar % strlen(CHAR_MAP)];
+	}
+	printf("End.\n");
+	return 0;
+}
+
+// EOF