pcre2test: dynamically allocate buffer for JITTARGET

in preparation for deprecating the use of static buffers, increase
its size to the next power of 2.

Author: carenas

doc/pcre2api.3

@@ -1296,8 +1296,8 @@ documentation for more details.
 .sp
   PCRE2_CONFIG_JITTARGET
 .sp
-The \fIwhere\fP argument should point to a buffer that is at least 64 code
-units long. (The exact length required can be found by calling
+The \fIwhere\fP argument should point to a buffer that is suitable aligned and
+at least 128 code units long. (The exact length required can be found by calling
 \fBpcre2_config()\fP with \fBwhere\fP set to NULL.) The buffer is filled with a
 string that contains the name of the architecture for which the JIT compiler is
 configured, for example "x86 32bit (little endian + unaligned)". If JIT support

src/pcre2test.c

@@ -3037,7 +3037,15 @@ config_str(PCRE2_CONFIG_UNICODE_VERSION, buf);
 fprintf(f, "Unicode version %s", buf);
 }
 
-
+#if defined(__s390x__) || \
+  ((defined(__ppc64__) || defined(__powerpc64__) || (defined(_ARCH_PPC64) && defined(__64BIT__)) || \
+    (defined(_POWER) && defined(__64BIT__))) && !defined(__LITTLE_ENDIAN__)) || \
+  (defined(__ppc__) || defined(__powerpc__) || defined(_ARCH_PPC) || defined(_ARCH_PWR) || defined(_ARCH_PWR2) || defined(_POWER)) || \
+  (((defined(__mips__) && !defined(_LP64)) || defined(__mips64)) && !defined(__MIPSEL__))
+#define PCRE2_BIG_ENDIAN 1
+#else
+#define PCRE2_LITTLE_ENDIAN 1
+#endif
 
 /*************************************************
 *               Print JIT target                 *
@@ -3046,9 +3054,20 @@ fprintf(f, "Unicode version %s", buf);
 static void
 print_jit_target(FILE *f)
 {
-char buf[VERSION_SIZE];
-config_str(PCRE2_CONFIG_JITTARGET, buf);
-fputs(buf, f);
+PCRE2_SIZE len = pcre2_config(PCRE2_CONFIG_JITTARGET, NULL);
+const int bytes_per_codepoint = test_mode /  8;
+char *buf = malloc(len * 4);
+
+pcre2_config(PCRE2_CONFIG_JITTARGET, buf);
+for (int i = 0; i < len; i++)
+   {
+#ifdef PCRE2_LITTLE_ENDIAN
+   putc(*(buf + (i * bytes_per_codepoint)), f);
+#else
+   putc(*(buf + (bytes_per_codepoint * i + (bytes_per_codepoint - 1))), f);
+#endif
+   }
+free(buf);
 }