z/OS support: Adding missing functions for z/OS

Some functions are not provided properly by the libc provided by z/OS
and need to be provided by the platform.

src/platform_unix.c

@@ -4,7 +4,9 @@
 // This file is under GNU General Public License 3.0
 // see LICENSE.txt
 
+#ifndef ZOS
 #define _POSIX_C_SOURCE 200809L
+#endif
 
 #ifdef ANDROID
 #ifndef __LP64__ 
@@ -37,9 +39,55 @@
 #endif
 #define SYSTEM_DB_FILENAME "system.db"
 
-#ifdef ANDROID
-#include <uuid.h>
+#ifndef strndup
+char *strndup (const char *s, size_t n)
+{
+     char *result;
+     size_t len = strnlen (s, n);
 
+     result = (char *) malloc (len + 1);
+     if (!result)
+        return 0;
+
+    result[len] = '\0';
+    return (char *) memcpy (result, s, len);
+}
+#endif
+
+#ifndef strnlen
+size_t strnlen (const char *s, size_t maxlen)
+{
+    size_t i;
+
+    for (i = 0; i < maxlen; ++i)
+        if (s[i] == '\0')
+            break;
+    return i;
+}
+#endif
+
+#ifndef stpcpy
+char *stpcpy(char *dst, const char *src)
+{
+    for (;; ++dst, ++src) {
+        *dst = *src;
+        if (*dst == 0)
+            break;
+    }
+    return dst;
+}
+#endif
+
+#ifndef alloca
+#pragma linkage(__alloca,builtin)
+void *__alloca(unsigned long x);
+void *alloca(unsigned long x)
+{
+    return __alloca(x);
+}
+#endif
+
+#if defined(ANDROID) || defined(ZOS)
 /* FIXME : timegm will miss when linking for x86_64 on android, when supported */
 #ifndef __LP64__ 
 time_t timegm(struct tm* const t) {
@@ -72,16 +120,6 @@ char *stpncpy(char *dst, const char *src, size_t n)
     return (dst);
 }
 
-char *stpcpy(char *dst, const char *src)
-{
-    for (;; ++dst, ++src) {
-        *dst = *src;
-        if (*dst == 0)
-            break;
-    }
-    return dst;
-}
-
 /*
 long int random(void)
 {
@@ -125,8 +163,36 @@ const char *android_system_db(void)
     }
     return buffer;
 }
+#endif
+
+#ifdef ZOS
+char * e2as(const char * str)
+{
+    char *ret = (char *)malloc(strlen(str));
+    strcpy(ret, str);
+    __e2a_s(ret);
+    return ret;
+}
+
+char * as2e(const char * str)
+{
+    char *ret = (char *)malloc(strlen(str));
+    strcpy(ret, str);
+    __a2e_s(ret);
+    return ret;
+}
+
+void uuid_generate_random(pEpUUID out)
+{
+}
+
+void uuid_unparse_upper(pEpUUID uu, uuid_string_t out)
+{
+}
+#endif
 
 
+#ifdef ANDROID
 void uuid_generate_random(pEpUUID out)
 {
     uuid_t *uuid;
@@ -147,7 +213,6 @@ void uuid_generate_random(pEpUUID out)
     }
 }
 
-
 void uuid_unparse_upper(pEpUUID uu, uuid_string_t out)
 {
     uuid_t *uuid;
@@ -171,7 +236,6 @@ void uuid_unparse_upper(pEpUUID uu, uuid_string_t out)
         uuid_destroy(uuid);
     }
 }
-
 #endif
 
 #if !defined(BSD) && !defined(__APPLE__)

src/platform_unix.h

@@ -7,7 +7,7 @@
 #ifndef PLATFORM_UNIX_H
 #define PLATFORM_UNIX_H
 
-#ifndef __APPLE__
+#if !defined(__APPLE__) && !defined(ZOS)
 #define _POSIX_C_SOURCE 200809L
 #endif
 
@@ -15,13 +15,30 @@
 #include <unistd.h>
 #include <strings.h>
 #include <sys/select.h>
+#ifndef ZOS
 #include <sys/param.h>
+#endif
 #include <regex.h>
 
-#ifndef ANDROID
+#ifdef ZOS
+char * e2as(const char * str);
+char * as2e(const char * str);
+#endif
+
+#if defined(ANDROID) || defined(ZOS)
+typedef unsigned char uuid_t[16];
+#else
 #include <uuid/uuid.h>
 #endif
 
+#ifndef MIN
+#define MIN(A, B) ((A)>(B) ? (B) : (A))
+#endif
+
+#ifndef MAX
+#define MAX(A, B) ((A)>(B) ? (A) : (B))
+#endif
+
 // pEp files and directories
 
 #ifndef PER_USER_DIRECTORY
@@ -36,7 +53,6 @@
 #endif
 #endif
 
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -144,7 +160,7 @@ typedef char uuid_string_t[37];
 // on *nix, uuid_t is an array and already implements pointer semantics
 #define UUID uuid_t
 
-#ifdef ANDROID
+#if defined(ANDROID) || defined(ZOS)
 typedef char pEpUUID[16];
 void uuid_generate_random(pEpUUID out);
 void uuid_unparse_upper(pEpUUID uu, uuid_string_t out);