[SHELL] Port to Solaris

- Solaris lacks paths.h and the various _PATH_* #defines.
  Check for them in configure.ac and fall back on the
  usual suspects when they are missing.

- Older Solaris lacks isblank(), and versions that have it
  use a macro.  Check for the declaration in configure.ac
  and fall back on a naive version when missing.

- Older Solaris does not support %jd (intmax_t) in format
  strings, but it does support the PRIdMAX macro from inttypes.h.
  Do a configure check for PRIdMAX and use it in the code.
  If it doesn't exist, define it to "lld" when sizeof(long long)
  equals sizeof(intmax_t) as this is more likely to work on
  older systems.  Otherwise, use "jd" and hope for the best.

- Older Solaris lacks stdint.h, but inttypes.h provides the
  same types and works on all platforms I've tried dash on,
  so just use it instead.

- Older Solaris doesn't like it when vsnprintf() is passed
  a NULL buffer (in violation of the POSIX spec, of course).
  Pass a 1-byte dummy buffer instead.

- Solaris lacks tempfile and mktemp programs.  Fall back on a
  "good-enough" custom function in mkbuiltins.

Signed-off-by: Brian Koropoff <bkoropoff@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/output.c b/src/output.c
index 2f9b5c4..f62e7ea 100644
--- a/src/output.c
+++ b/src/output.c
@@ -378,6 +378,20 @@ xvsnprintf(char *outbuf, size_t length, const char *fmt, va_list ap)
 {
 	int ret;
 
+#ifdef __sun
+	/*
+	 * vsnprintf() on older versions of Solaris returns -1 when
+	 * passed a length of 0.  To avoid this, use a dummy
+	 * 1-character buffer instead.
+	 */
+	char dummy[1];
+
+	if (length == 0) {
+		outbuf = dummy;
+		length = sizeof(dummy);
+	}
+#endif
+
 	INTOFF;
 	ret = vsnprintf(outbuf, length, fmt, ap);
 	INTON;