From a734f141de5a42cdf1a98d6b5eea5bf04c91d4fb Mon Sep 17 00:00:00 2001
From: sisungo <sisungo@icloud.com>
Date: Tue, 7 Jul 2026 10:50:02 +0800
Subject: [PATCH] feat: add compatibility with linux

Signed-off-by: sisungo <sisungo@icloud.com>
---
 backupfile.c |  6 ++--
 compat.h     | 88 +++++++++++++++++++++++++++++++++++++++++++++++++---
 inp.c        |  8 ++---
 pch.c        |  7 +++--
 4 files changed, 94 insertions(+), 15 deletions(-)

diff --git a/backupfile.c b/backupfile.c
index 6307330..b4b196e 100644
--- a/backupfile.c
+++ b/backupfile.c
@@ -1,9 +1,9 @@
 /*-
  * Copyright (C) 1990 Free Software Foundation, Inc.
- * 
+ *
  * This program is free software; you can redistribute it and/or modify it
  * without restriction.
- * 
+ *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.
@@ -104,7 +104,7 @@ max_backup_version(const char *file, const char *dir)
 	file_name_length = strlen(file);
 
 	while ((dp = readdir(dirp)) != NULL) {
-		if (dp->d_namlen <= file_name_length)
+		if (strlen(dp->d_name) <= file_name_length)
 			continue;
 
 		this_version = version_number(file, dp->d_name, file_name_length);
diff --git a/compat.h b/compat.h
index f1961c4..f9fa661 100644
--- a/compat.h
+++ b/compat.h
@@ -1,9 +1,87 @@
 #include <stdlib.h>
+#include <limits.h>
+#include <errno.h>
+#include <ctype.h>
 
-static inline void *reallocarray(void *p, size_t n, size_t size) {
-    if (n && size > (size_t)-1 / n) {
-        errno = ENOMEM;
-        return NULL;
+static inline long long strtonum(const char *nptr, long long minval,
+                                  long long maxval, const char **errstr) {
+    const char *p = nptr;
+    char *endptr;
+    long long result;
+    int saved_errno;
+
+    if (errstr != NULL)
+        *errstr = NULL;
+
+    if (nptr == NULL || *nptr == '\0') {
+        if (errstr != NULL)
+            *errstr = "invalid";
+        errno = EINVAL;
+        return 0;
     }
-    return realloc(p, n * size);
+
+    if (minval > maxval) {
+        if (errstr != NULL)
+            *errstr = "invalid";
+        errno = EINVAL;
+        return 0;
+    }
+
+    while (isspace((unsigned char)*p))
+        p++;
+
+    saved_errno = errno;
+    errno = 0;
+
+    result = strtoll(p, &endptr, 10);
+
+    if (errno == ERANGE) {
+        if (errstr != NULL) {
+            *errstr = (result == LLONG_MIN || result < minval) ?
+                      "too small" : "too large";
+        }
+        errno = ERANGE;
+        return 0;
+    }
+
+    if (endptr == p) {
+        if (errstr != NULL)
+            *errstr = "invalid";
+        errno = EINVAL;
+        return 0;
+    }
+
+    while (isspace((unsigned char)*endptr))
+        endptr++;
+    if (*endptr != '\0') {
+        if (errstr != NULL)
+            *errstr = "invalid";
+        errno = EINVAL;
+        return 0;
+    }
+
+    if (result < minval) {
+        if (errstr != NULL)
+            *errstr = "too small";
+        errno = ERANGE;
+        return 0;
+    }
+    if (result > maxval) {
+        if (errstr != NULL)
+            *errstr = "too large";
+        errno = ERANGE;
+        return 0;
+    }
+
+    if (errstr != NULL)
+        *errstr = NULL;
+    return result;
+}
+
+static inline void *reallocf(void *ptr, size_t size) {
+    void *new_ptr = realloc(ptr, size);
+    if (new_ptr == NULL && size != 0) {
+        free(ptr);
+    }
+    return new_ptr;
 }
diff --git a/inp.c b/inp.c
index b07eebd..e51476b 100644
--- a/inp.c
+++ b/inp.c
@@ -1,11 +1,11 @@
 /*-
  * Copyright 1986, Larry Wall
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following condition is met:
  * 1. Redistributions of source code must retain the above copyright notice,
  * this condition and the following disclaimer.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
@@ -17,7 +17,7 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- * 
+ *
  * patch - a program to apply diffs to original files
  *
  * -C option added in 1998, original code by Marc Espie, based on FreeBSD
@@ -43,12 +43,12 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <fcntl.h>
 
 #include "common.h"
 #include "util.h"
 #include "pch.h"
 #include "inp.h"
-#include "compat.h"
 
 /* Input-file-with-indexable-lines abstract type */
 
diff --git a/pch.c b/pch.c
index 71f7312..ca0c420 100644
--- a/pch.c
+++ b/pch.c
@@ -1,11 +1,11 @@
 /*-
  * Copyright 1986, Larry Wall
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following condition is met:
  * 1. Redistributions of source code must retain the above copyright notice,
  * this condition and the following disclaimer.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
@@ -17,7 +17,7 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- * 
+ *
  * patch - a program to apply diffs to original files
  *
  * -C option added in 1998, original code by Marc Espie, based on FreeBSD
@@ -42,6 +42,7 @@
 #include "util.h"
 #include "pch.h"
 #include "pathnames.h"
+#include "compat.h"
 
 /* Patch (diff listing) abstract type. */