Add Linux support, write input functions

.gitignore

@@ -1,2 +1,4 @@
 input/
 advent
+compile_commands.json
+.cache

GNUmakefile

@@ -0,0 +1,16 @@
+CFLAGS= 	-std=c99 -Wall -pedantic -Iinclude -g
+LDFLAGS=	-lbsd
+OUT=    	-o advent
+SRC=    	src/*.c \
+		src/2015/*.c \
+		src/2016/*.c \
+		src/2017/*.c \
+		src/2018/*.c \
+		src/2019/*.c \
+		src/2020/*.c
+
+all:
+	cc ${CFLAGS} ${OUT} ${LDFLAGS} ${SRC}
+
+clean:
+	rm advent

Makefile

@@ -1,9 +1,16 @@
-CFLAGS= -std=c99 -Wall -pedantic -Iinclude
+CFLAGS= 	-std=c99 -Wall -pedantic -Iinclude -g
+LDFLAGS=	''
 OUT=    	-o advent
-SRC=    src/*.c src/2015/*.c src/2016/*.c src/2017/*.c src/2018/*.c src/2019/*.c src/2020/*.c
+SRC=    	src/*.c \
+		src/2015/*.c \
+		src/2016/*.c \
+		src/2017/*.c \
+		src/2018/*.c \
+		src/2019/*.c \
+		src/2020/*.c
 
 all:
-	cc ${CFLAGS} ${OUT} ${SRC}
+	cc ${CFLAGS} ${OUT} ${LDFLAGS} ${SRC}
 
 clean:
 	rm advent

README.md

@@ -1,12 +1,12 @@
 # aoc
 
-Advent Of Code solutions using C99
+Advent Of Code solutions using C99.
 
 ## Building
 
-This project relies on several libc extensions specific to OpenBSD. As such it will only build and run on OpenBSD.
+This project relies on several BSD extensions to the stdlib. BSDs should be able to build the project out of the box. If on a BSD, `make` is enough to build the project.
 
-`make` is enough to build the project
+Linux users will need `libbsd` installed and use GNU Make with the supplied GNUmakefile, which should be automatically used with a simple `make`.
 
 ## Inputs
 

generator.sh

@@ -80,6 +80,7 @@ EOF
 #include "input.h"
 
 void advent${year}day${d}(void) {
+	char *input = get_input("input/${year}/${d}");
 	printf("Solution for Day ${d} of ${year} is not completed yet\n");
 }
 EOF

get_input.sh

@@ -1,7 +1,8 @@
 #!/usr/bin/env bash
 
+rm -rf input
 for year in {2015..2020}; do
-	mkdir -p $year/input
+	mkdir -p input/$year
 	for day in {1..25}; do
 		if [[ day -lt 10 ]]; then
 			d="0$day"
@@ -9,7 +10,7 @@ for year in {2015..2020}; do
 			d="$day"
 		fi
 		url="https://adventofcode.com/$year/day/$day/input"
-		curl --cookie "session=$1" $url | perl -pe 'chomp if eof' > $year/input/$d
+		curl --cookie "session=$1" $url | perl -pe 'chomp if eof' > input/$year/$d
 	done
-	touch $year/input/test
+	touch input/$year/test
 done

include/input.h

@@ -0,0 +1,11 @@
+#ifndef ADVENT_H_INPUT
+#define ADVENT_H_INPUT
+
+#include <stdlib.h>
+
+char *get_input(const char *);
+char **get_lines(const char *, size_t *);
+int *get_ints(const char *, size_t *);
+void del_lines(char **);
+
+#endif // ADVENT_H_INPUT

src/input.c

@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#include <bsd/stdlib.h>
+
+#include "input.h"
+
+char *get_input(const char *path) {
+    FILE *fp = NULL;
+    fp = fopen(path, "r");
+    if (fp == NULL) {
+        printf("Failed to open %s. Exiting.\n", path);
+        exit(1);
+    }
+
+    fseek(fp, 0, SEEK_END);
+    size_t fsz = ftell(fp);
+    rewind(fp);
+
+    char* buf = NULL;
+    buf = malloc(fsz + 1);
+    if (buf == NULL) {
+        printf("Failed to malloc buf. Exiting.\n");
+        exit(1);
+    }
+
+    fread(buf, 1, fsz, fp);
+    buf[fsz] = '\0';
+    fclose(fp);
+
+    return buf;
+}
+
+char **get_lines(const char *path, size_t *lsz) {
+    char **lines = NULL;
+    char *delim = "\n";
+    char *s = get_input(path), *t = strtok(s, delim);
+    size_t n = 0;
+
+    while (t != NULL) {
+        lines = realloc(lines, sizeof(char *) * ++n);
+        if (lines == NULL) {
+            printf("Failed to realloc lines buffer. Exiting.\n");
+            exit(1);
+        }
+        lines[n - 1] = t;
+        t = strtok(NULL, delim);
+    }
+
+    *lsz = n;
+    return lines;
+}
+
+int *get_ints(const char *path, size_t *sz) {
+    char **lines = get_lines(path, sz);
+    int *i = malloc(sizeof(int) * *sz);
+
+    for (size_t idx = 0; idx < *sz; idx++) {
+        int n;
+        const char *errstr;
+        n = strtonum(lines[idx], INT_MIN, INT_MAX, &errstr);
+        if (errstr) {
+            printf("Failed to convert %s to int. Exiting.\n", lines[idx]);
+            exit(1);
+        }
+        i[idx] = n;
+    }
+
+    del_lines(lines);
+    return i;
+}
+
+void del_lines(char **lines) {
+    free(lines[0]);
+    free(lines);
+}

src/main.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <bsd/stdlib.h>
 
 #include "advent2015.h"
 #include "advent2016.h"