Add 2021 progress

2021/1/1/main.c

@@ -0,0 +1,14 @@
+#include "input.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main (void) {
+	uintmax_t cnt = 0, i;
+	for (i = 1; i < sizeof (input) / sizeof (*input); i++) {
+		if (input[i] > input[i - 1]) cnt++;
+	}
+	printf ("%ju\n", cnt);
+}

2021/1/2/main.c

@@ -0,0 +1,19 @@
+#include "input.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static inline uintmax_t
+last_three_sum (const uintmax_t *x) {
+	return (*(x - 2) + *(x - 1) + *(x));
+}
+
+int
+main (void) {
+	uintmax_t cnt = 0, i;
+	for (i = 3; i < sizeof (input) / sizeof (*input); i++) {
+		if (last_three_sum (&input[i]) > last_three_sum (&input[i - 1])) cnt++;
+	}
+	printf ("%ju\n", cnt);
+}

2021/2/1/main.c

@@ -0,0 +1,92 @@
+#define _POSIX_C_SOURCE 200809L
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+enum command {
+	UNK = 0,
+	FORWARD,
+	DOWN,
+	UP,
+};
+
+struct act {
+	enum command cmd;
+	uintmax_t    cnt;
+};
+
+static int
+carray (FILE *f, struct act *res) {
+	char *  str = NULL;
+	size_t  bs  = 0;
+	ssize_t b   = getline (&str, &bs, f);
+
+	if (b == -1) {
+		fprintf (stderr, "getline returned a error\n");
+		return 1;
+	}
+
+	char *act = strtok (str, " "),
+	     *cnt = strtok (NULL, "\n");
+
+	if (act == NULL) {
+		fprintf (stderr, "Action is empty.\n");
+		return 1;
+	}
+
+	if (strcmp (act, "forward") == 0) {
+		res->cmd = FORWARD;
+	} else if (strcmp (act, "down") == 0) {
+		res->cmd = DOWN;
+	} else if (strcmp (act, "up") == 0) {
+		res->cmd = UP;
+	} else {
+		fprintf (stderr, "Line couldn't be parsed.\n");
+		return 2;
+	}
+	res->cnt = strtoumax (cnt, NULL, 10);
+	return 0;
+}
+
+int
+main (void) {
+	struct {
+		uintmax_t depth, pos;
+	} axis = {
+	  .depth = 0,
+	  .pos   = 0,
+	};
+	struct act cur = {0};
+	while (carray (stdin, &cur) == 0) {
+		switch (cur.cmd) {
+			case FORWARD:
+				fprintf (stderr, "Added %zu to pos\n", cur.cnt);
+				axis.pos += cur.cnt;
+				break;
+			case DOWN:
+				fprintf (stderr, "Added %zu to depth\n", cur.cnt);
+				axis.depth += cur.cnt;
+				break;
+			case UP:
+				fprintf (stderr, "Subtracted %zu from depth\n", cur.cnt);
+				axis.depth -= cur.cnt;
+				break;
+			default: {
+				fprintf (stderr, "Invalid action was parsed.\n");
+				return 1;
+			}
+		}
+	}
+	printf ("D: %zu\n"
+	        "P: %zu\n"
+	        "C: %zu\n",
+	        axis.depth,
+	        axis.pos,
+	        axis.pos * axis.depth);
+	return 0;
+}

2021/2/2/main.c

@@ -0,0 +1,94 @@
+#define _POSIX_C_SOURCE 200809L
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+enum command {
+	UNK = 0,
+	FORWARD,
+	DOWN,
+	UP,
+};
+
+struct act {
+	enum command cmd;
+	uintmax_t    cnt;
+};
+
+static int
+carray (FILE *f, struct act *res) {
+	char *  str = NULL;
+	size_t  bs  = 0;
+	ssize_t b   = getline (&str, &bs, f);
+
+	if (b == -1) {
+		fprintf (stderr, "getline returned a error\n");
+		return 1;
+	}
+
+	char *act = strtok (str, " "),
+	     *cnt = strtok (NULL, "\n");
+
+	if (act == NULL) {
+		fprintf (stderr, "Action is empty.\n");
+		return 1;
+	}
+
+	if (strcmp (act, "forward") == 0) {
+		res->cmd = FORWARD;
+	} else if (strcmp (act, "down") == 0) {
+		res->cmd = DOWN;
+	} else if (strcmp (act, "up") == 0) {
+		res->cmd = UP;
+	} else {
+		fprintf (stderr, "Line couldn't be parsed.\n");
+		return 2;
+	}
+	res->cnt = strtoumax (cnt, NULL, 10);
+	return 0;
+}
+
+int
+main (void) {
+	struct {
+		uintmax_t depth, pos, aim;
+	} axis = {
+	  .depth = 0,
+	  .pos   = 0,
+	  .aim   = 0,
+	};
+	struct act cur = {0};
+	while (carray (stdin, &cur) == 0) {
+		switch (cur.cmd) {
+			case FORWARD:
+				fprintf (stderr, "Added %zu to pos\n", cur.cnt);
+				axis.pos += cur.cnt;
+				axis.depth += axis.aim * cur.cnt;
+				break;
+			case DOWN:
+				fprintf (stderr, "Added %zu to depth\n", cur.cnt);
+				axis.aim += cur.cnt;
+				break;
+			case UP:
+				fprintf (stderr, "Subtracted %zu from depth\n", cur.cnt);
+				axis.aim -= cur.cnt;
+				break;
+			default: {
+				fprintf (stderr, "Invalid action was parsed.\n");
+				return 1;
+			}
+		}
+	}
+	printf ("D: %zu\n"
+	        "P: %zu\n"
+	        "C: %zu\n",
+	        axis.depth,
+	        axis.pos,
+	        axis.pos * axis.depth);
+	return 0;
+}

2021/Makefile

@@ -0,0 +1,18 @@
+include config.mk
+
+OBJ = ${SRC:.c=.o}
+
+all: ${OBJ} ${OUT}
+
+%.o: %.c
+	${CC} -o $@ -c ${CFLAGS} $<
+
+clean:
+	rm -f ${OBJ} ${OUT}
+
+ifneq (${OUT},)
+${OUT}: ${OBJ}
+	${CC} -o "$@" ${LDFLAGS} $^
+endif
+
+.PHONY: all clean

2021/config.mk

@@ -0,0 +1,42 @@
+# Defaults
+CC      = clang
+DEBUG   = 1
+STATIC  = 0
+
+LDFLAGS =
+CFLAGS =\
+	-std=c99\
+	-Weverything\
+	-Wno-padded\
+	-Wno-disabled-macro-expansion\
+	-pedantic
+
+# Sources / Results
+SRC =\
+	2/2/main.c
+
+LIBDIR =
+LIB =\
+	c
+
+INCDIR = 2/
+
+OUT = bin
+
+# Conditionals / Appends
+LDFLAGS +=\
+	$(addprefix -L,${LIBDIR})\
+	$(addprefix -l,${LIB})
+
+CFLAGS +=\
+	$(addprefix -I,${INCDIR})
+
+ifeq (${DEBUG},1)
+CFLAGS += -g
+else
+CFLAGS += -O2 -Werror
+endif
+
+ifeq (${STATIC},1)
+LDFLAGS += -static
+endif