Init commit with a complete day 1.

.gitignore

@@ -0,0 +1 @@
+bin

Makefile

@@ -0,0 +1,18 @@
+CC=cc
+
+CFLAGS=-static --std=c2x -O3 -Wall -Werror -Wextra -pedantic
+
+EXES = $(wildcard day*)
+
+all: create_bin_dir $(EXES)
+
+create_bin_dir:
+	@mkdir -p bin
+
+day1: day1/p1.c day1/p2.c
+	${CC} ${CFLAGS} $@/p1.c -o bin/$@p1
+	${CC} ${CFLAGS} $@/p2.c -o bin/$@p2
+
+
+clean:
+	rm -f bin/day*p*

day1/in.test

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet

day1/in.test2

@@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen

day1/p1.c

@@ -0,0 +1,42 @@
+#define  _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+int main(int argc, char **argv) {
+    FILE *input;
+    char *line = NULL;
+    size_t line_length = 0;
+
+    if (argc == 1 || argv[1][0] == '-')
+		input = stdin;
+	else if ((input = fopen(argv[1], "r")) == NULL) {
+		printf("Cannot open file %s\n", argv[1]);
+		return -1;
+	}
+
+    int32_t calibration_value = 0;
+
+    while (getline(&line, &line_length, input) != -1) {
+        int32_t current_calibration_value = -1;
+        int8_t last_digit = 0;
+
+        for (size_t i = 0; i < line_length-1; ++i) {
+            if (line[i]>>4 == 0x3) {
+                if (current_calibration_value == -1)
+                    current_calibration_value = (line[i]&0xf) * 10;
+                last_digit = line[i]&0xf;
+            }
+        }
+
+        if (current_calibration_value != -1)
+            calibration_value += current_calibration_value + last_digit;
+
+        memset(line, 0, line_length);
+    }
+
+    printf("%d\n", calibration_value);
+
+    return 0;
+}

day1/p2.c

@@ -0,0 +1,103 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+int main(int argc, char **argv) {
+    FILE *input;
+    char *line = NULL;
+    size_t line_length = 0;
+
+    if (argc == 1 || argv[1][0] == '-')
+		input = stdin;
+	else if ((input = fopen(argv[1], "r")) == NULL) {
+		printf("Cannot open file %s\n", argv[1]);
+		return -1;
+	}
+
+    int32_t calibration_value = 0;
+
+    while (getline(&line, &line_length, input) != -1) {
+        int32_t current_calibration_value = 0;
+        int8_t last_digit = 0;
+
+        for (size_t i = 0; i < line_length-1; ++i) {
+            if (line[i]>>4 == 0x3) {
+                if (current_calibration_value == 0)
+                    current_calibration_value = (line[i]&0xf) * 10;
+                last_digit = line[i]&0xf;
+            } else {
+                int8_t digit = 0;
+                switch (line[i]) {
+                    case 'o': // 1
+                        if (i+2 <= line_length)
+                            if (line[i+1] == 'n' && line[i+2] == 'e') {
+                                digit = 1;
+                            }
+                        break;
+                    case 't': // 2 3
+                        if (i+2 <= line_length)
+                            if (line[i+1] == 'w' && line[i+2] == 'o') {
+                                digit = 2;
+                                break;
+                            }
+                        if (i+4 <= line_length)
+                            if (line[i+1] == 'h' && line[i+2] == 'r' && line[i+3] == 'e' && line[i+4] == 'e') {
+                                digit = 3;
+                            }
+                        break;
+                    case 'f': // 4 5
+                        if (i+3 <= line_length)
+                            if (line[i+1] == 'o' && line[i+2] == 'u' && line[i+3] == 'r') {
+                                digit = 4;
+                                break;
+                            }
+                        if (i+3 <= line_length)
+                            if (line[i+1] == 'i' && line[i+2] == 'v' && line[i+3] == 'e') {
+                                digit = 5;
+                            }
+                        break;
+                    case 's': // 6 7
+                        if (i+2 <= line_length)
+                            if (line[i+1] == 'i' && line[i+2] == 'x') {
+                                digit = 6;
+                                break;
+                            }
+                        if (i+4 <= line_length)
+                            if (line[i+1] == 'e' && line[i+2] == 'v' && line[i+3] == 'e' && line[i+4] == 'n') {
+                                digit = 7;
+                            }
+                        break;
+                    case 'e': // 8
+                        if (i+4 <= line_length)
+                            if (line[i+1] == 'i' && line[i+2] == 'g' && line[i+3] == 'h' && line[i+4] == 't') {
+                                digit = 8;
+                            }
+                        break;
+                    case 'n': // 9
+                        if (i+3 <= line_length)
+                            if (line[i+1] == 'i' && line[i+2] == 'n' && line[i+3] == 'e') {
+                                digit = 9;
+                            }
+                        break;
+                }
+
+                if (digit != 0) {
+                    if (current_calibration_value == 0)
+                        current_calibration_value = digit * 10;
+                    last_digit = digit;
+                }
+            }
+        }
+
+        if (current_calibration_value != 0)
+            calibration_value += current_calibration_value + last_digit;
+
+        memset(line, 0, line_length);
+    }
+
+    printf("%d\n", calibration_value);
+
+    return 0;
+}

run

@@ -0,0 +1,23 @@
+#!/usr/bin/sh
+
+DAY=1
+if [ -n "$1" ]; then
+    DAY=$1
+fi
+
+PART=1
+if [ -n "$2" ]; then
+    PART=$2
+fi
+
+INPUT=my
+if [ -n "$3" ]; then
+    INPUT=$3
+fi
+
+mkdir -p bin
+
+set -e
+
+echo -n "Day $DAY part $PART with '$INPUT' input: "
+bin/day${DAY}p$PART < day$DAY/in.$INPUT

test

@@ -0,0 +1,8 @@
+#!/usr/bin/sh
+
+test_case() {
+	[[ $(bin/day$1p$2 < day$1/in.$3) = "$4" ]] && { echo -ne "\e[32mpassed\e[0m"; } || { echo -ne "\e[31mfailed\e[0m"; }
+}
+
+echo "Day $1 with test data part 1 $(test_case $1 1 "test" "142"), and part 2 $(test_case $1 2 "test2" "281").";
+echo "Day $1 with my data part 1 $(test_case $1 1 "my" "55621"), and part 2 $(test_case $1 2 "my" "53592").";