Ticket #580: Fix-usage-of-PATH_MAX-not-POSIX-580.patch

src/configfile.c

@@ -7 +7 @@
 #include <string.h>
 #include <stdio.h>
 #include <ctype.h>
+#include <limits.h>
 #include <assert.h>
 
 #include "server.h"
@@ -909 +910 @@
         return ret;
 }
 
+static char* getCWD() {
+        char *s, *s1;
+        size_t len;
+#ifdef PATH_MAX
+        len = PATH_MAX;
+#else
+        len = 4096;
+#endif
+
+        s = malloc(len);
+        if (!s) return NULL;
+        while (NULL == getcwd(s, len)) {
+                if (errno != ERANGE || SSIZE_MAX - len < len) return NULL;
+                len *= 2;
+                s1 = realloc(s, len);
+                if (!s1) {
+                        free(s);
+                        return NULL;
+                }
+                s = s1;
+        }
+        return s;
+}
+
 int config_parse_cmd(server *srv, config_t *context, const char *cmd) {
         proc_handler_t proc;
         tokenizer_t t;
         int ret;
         buffer *source;
         buffer *out;
-        char oldpwd[PATH_MAX];
+        char *oldpwd;
 
-        if (NULL == getcwd(oldpwd, sizeof(oldpwd))) {
+        if (NULL == (oldpwd = getCWD())) {
                 log_error_write(srv, __FILE__, __LINE__, "s",
                                 "cannot get cwd", strerror(errno));
                 return -1;
@@ -942 +967 @@
         buffer_free(source);
         buffer_free(out);
         chdir(oldpwd);
+        free(oldpwd);
         return ret;
 }