Add missing functions for non-POSIX targets

Makefile

@@ -52,6 +52,7 @@ SRC_SRCS_1 += apu.c audio.c
 SRC_SRCS_1 += file.c save.c
 SRC_SRCS_1 += overlay.c menu.c
 SRC_SRCS_1 += state.c ini.c
+SRC_SRCS_1 += compat.c
 SRC_SRCS_1 += sdl_render.c sdl_input.c sdl_audio.c sdl_timer.c
 SRC_SRCS_1 += sdl_overlay.c
 

src/compat.c

@@ -0,0 +1,54 @@
+#include "compat.h"
+
+
+#if !defined (__unix__) && !(defined (__APPLE__) && defined (__MACH__))
+
+#include <stdlib.h>
+#include <string.h>
+
+/*
+static inline size_t strnlen(const char* str, size_t size) {
+    int len = 0, remain = size;
+    while (remain > 0 && *str++) --remain;
+    return (size - remain);
+}
+*/
+
+char* strndup(const char *str, size_t size) {
+    size_t len = strnlen(str, size);
+    char* dup = malloc(len + 1);
+    dup[len] = '\0';
+    return memcpy(dup, str, len);
+}
+
+ssize_t getline(char **restrict lineptr, size_t *restrict n,
+                FILE *restrict stream) {
+    if (NULL == *lineptr || 0 == *n) {
+        *n = 120;
+        *lineptr = (char*)malloc(*n);
+        if (NULL == *lineptr) return -1;
+    }
+
+    int chr = 0;
+    ssize_t len = 0;
+    char* ptr = *lineptr;
+    while ((chr = fgetc(stream)) >= 0) {
+        ++len;
+        *ptr++ = chr;
+        if (*n < len + 1) {
+            char* more = realloc(*lineptr, *n * 2);
+            if (NULL == more) return -1;
+            *lineptr = more;
+            *n *= 2;
+            ptr = *lineptr + len;
+        }
+        if ('\n' == chr) break;
+    }
+
+    ptr[len] = '\0';
+
+    return (len == 0 ? -1 : len);
+}
+
+
+#endif

src/compat.h

@@ -0,0 +1,18 @@
+#ifndef NESE_COMPAT_H_
+#define NESE_COMPAT_H_
+
+#if !defined (__unix__) && !(defined (__APPLE__) && defined (__MACH__))
+
+
+#include <stdio.h>
+
+
+char* strndup(const char *str, size_t size);
+
+ssize_t getline(char **restrict lineptr, size_t *restrict n,
+                FILE *restrict stream);
+
+
+#endif
+
+#endif // NESE_COMPAT_H_

src/ini.c

@@ -5,6 +5,7 @@
 #include <string.h>
 
 #include "ini.h"
+#include "compat.h"
 
 
 static inline int stracmp(const char* zstr,