From: Andy Dougherty <doughera@lafayette.edu>
Date: Thu, 14 Jun 2007 13:12:57 +0000 (-0400)
Subject: Re: vsprintf
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=d05d9be5bb960a2dda35f9c10256ae0e8caaede8;p=p5sagit%2Fp5-mst-13.2.git

Re: vsprintf
Message-ID: <Pine.LNX.4.64.0706141312510.31762@fractal.phys.lafayette.edu>

p4raw-id: //depot/perl@31387
---

diff --git a/util.c b/util.c
index d989806..afa5de9 100644
--- a/util.c
+++ b/util.c
@@ -1832,24 +1832,51 @@ Perl_my_memcmp(const char *s1, const char *s2, register I32 len)
 #endif /* !HAS_MEMCMP || !HAS_SANE_MEMCMP */
 
 #ifndef HAS_VPRINTF
+/* This vsprintf replacement should generally never get used, since
+   vsprintf was available in both System V and BSD 2.11.  (There may
+   be some cross-compilation or embedded set-ups where it is needed,
+   however.)
+
+   If you encounter a problem in this function, it's probably a symptom
+   that Configure failed to detect your system's vprintf() function.
+   See the section on "item vsprintf" in the INSTALL file.
+
+   This version may compile on systems with BSD-ish <stdio.h>,
+   but probably won't on others.
+*/
 
 #ifdef USE_CHAR_VSPRINTF
 char *
 #else
 int
 #endif
-vsprintf(char *dest, const char *pat, char *args)
+vsprintf(char *dest, const char *pat, void *args)
 {
     FILE fakebuf;
 
+#if defined(STDIO_PTR_LVALUE) && defined(STDIO_CNT_LVALUE)
+    FILE_ptr(&fakebuf) = (STDCHAR *) dest;
+    FILE_cnt(&fakebuf) = 32767;
+#else
+    /* These probably won't compile -- If you really need
+       this, you'll have to figure out some other method. */
     fakebuf._ptr = dest;
     fakebuf._cnt = 32767;
+#endif
 #ifndef _IOSTRG
 #define _IOSTRG 0
 #endif
     fakebuf._flag = _IOWRT|_IOSTRG;
     _doprnt(pat, args, &fakebuf);	/* what a kludge */
-    (void)putc('\0', &fakebuf);
+#if defined(STDIO_PTR_LVALUE)
+    *(FILE_ptr(&fakebuf)++) = '\0';
+#else
+    /* PerlIO has probably #defined away fputc, but we want it here. */
+#  ifdef fputc
+#    undef fputc  /* XXX Should really restore it later */
+#  endif
+    (void)fputc('\0', &fakebuf);
+#endif
 #ifdef USE_CHAR_VSPRINTF
     return(dest);
 #else