feat: add compatibility with linux

Signed-off-by: sisungo <[email protected]>

backupfile.c

@@ -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);

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;
 }

inp.c

@@ -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 */
 

pch.c

@@ -42,6 +42,7 @@
 #include "util.h"
 #include "pch.h"
 #include "pathnames.h"
+#include "compat.h"
 
 /* Patch (diff listing) abstract type. */