From 12363f0ed6111943b0e71f0ada5b59db4734e1ad Mon Sep 17 00:00:00 2001
From: Evan Burkey <evan@burkey.co>
Date: Fri, 10 Dec 2021 12:41:36 -0800
Subject: [PATCH] add input functions

---
 .gitignore      |  3 ++
 CMakeLists.txt  |  2 ++
 build.sh        |  8 +++++
 include/input.h | 13 ++++++++
 src/input.c     | 89 +++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 115 insertions(+)
 create mode 100755 build.sh
 create mode 100644 include/input.h
 create mode 100644 src/input.c

diff --git a/.gitignore b/.gitignore
index 374fe5c..1633e14 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,4 @@
 cmake*
+.cache
+build
+compile_commands.json
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 85189d1..14eb77a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.17)
 project(flint C)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 set(CMAKE_C_STANDARD 99)
 include_directories(include)
@@ -9,6 +10,7 @@ set(SOURCES
     src/set.c
     src/stack.c
     src/binarytree.c
+    src/input.c
 )
 
 add_library(flint ${SOURCES})
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..18423d2
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,8 @@
+#!/bin/sh -e
+
+mkdir -p build
+cd build
+cmake ..
+make
+cp compile_commands.json ..
+cd 
diff --git a/include/input.h b/include/input.h
new file mode 100644
index 0000000..08fed0e
--- /dev/null
+++ b/include/input.h
@@ -0,0 +1,13 @@
+#ifndef LIBFLINT_INPUT_H
+#define LIBFLINT_INPUT_H
+
+#include <stdlib.h>
+
+char *get_input(const char *);
+char **split(const char *, size_t *, const char *);
+char **get_lines(const char *, size_t *);
+int *get_ints(const char *, size_t *);
+void del_split(char **);
+void del_lines(char **);
+
+#endif // LIBFLINT_INPUT_H
diff --git a/src/input.c b/src/input.c
new file mode 100644
index 0000000..ad439fe
--- /dev/null
+++ b/src/input.c
@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#ifdef __linux__
+#include <bsd/stdlib.h>
+#endif
+
+#include "input.h"
+
+char *get_input(const char *path) {
+    FILE *fp = NULL;
+    fp = fopen(path, "r");
+    if (fp == NULL) {
+        fprintf(stderr, "Failed to open %s. Returning NULL\n", path);
+        return NULL;
+    }
+
+    fseek(fp, 0, SEEK_END);
+    size_t fsz = ftell(fp);
+    rewind(fp);
+
+    char* buf = NULL;
+    buf = malloc(fsz + 1);
+    if (buf == NULL) {
+        fprintf(stderr, "Failed to malloc buf. Returning NULL\n");
+        fclose(fp);
+        return NULL;
+    }
+
+    fread(buf, 1, fsz, fp);
+    buf[fsz] = '\0';
+    fclose(fp);
+
+    return buf;
+}
+
+char **split(const char *s, size_t *lsz, const char *delim) {
+    char **lines = NULL;
+    char *t = strtok(s, delim);
+    size_t n = 0;
+
+    while (t != NULL) {
+        lines = realloc(lines, sizeof(char *) * ++n);
+        if (lines == NULL) {
+            fprintf(stderr, "Failed to realloc lines buffer. Returning NULL\n");
+            free(s);
+            return NULL;
+        }
+        lines[n - 1] = t;
+        t = strtok(NULL, delim);
+    }
+
+    *lsz = n;
+    return lines;
+}
+
+char **get_lines(const char *path, size_t *lsz) {
+    return split(get_input(path), lsz, "\n");
+}
+
+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. Returning NULL\n", lines[idx]);
+            exit(1);
+        }
+        i[idx] = n;
+    }
+
+    del_lines(lines);
+    return i;
+}
+
+void del_split(char **sp) {
+    free(sp[0]);
+    free(sp);
+}
+
+void del_lines(char **lines) {
+    del_split(lines);
+}