This PATCH is NOT intended to be merged (yet).
Some systems (namely HPUX) return -1 when maxsize in vsnprintf() is reached.
So replace that broken vsnprintf() with our own that returns correct value
upon overflow.
Could anybody give it some testing since I don't know how many broken systems
are out there?
If anybody could think of some better define than BROKEN_VSNPRINTF, I'm all
ears.
Linux is OK, HPUX is detected to be broken. On HPUX (11.23) test suite with
defined BROKEN_VSNPRINTF fails in 8 *.sh testsuites, without it it fails in
140 *.sh testsuites (out of 241).
Signed-off-by: Michal Rokos <michal.rokos@xxxxxxxxxxx>
diff --git a/Makefile b/Makefile
index ca5aad9..a1dbf1d 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,10 @@ all::
# Define V=1 to have a more verbose compile.
#
+# Define BROKEN_VSNPRINTF if your are on a system which vsnprintf() return
+# something else (typically -1) instead of number of characters which would
+# have been written to the final string if enough space had been available.
+#
# Define FREAD_READS_DIRECTORIES if your are on a system which succeeds
# when attempting to read from an fopen'ed directory.
#
@@ -526,6 +530,7 @@ ifeq ($(uname_S),HP-UX)
NO_UNSETENV = YesPlease
NO_HSTRERROR = YesPlease
NO_SYS_SELECT_H = YesPlease
+ BROKEN_VSNPRINTF = UnfortunatelyYes
endif
ifneq (,$(findstring arm,$(uname_M)))
ARM_SHA1 = YesPlease
@@ -629,6 +634,10 @@ endif
ifdef NO_C99_FORMAT
BASIC_CFLAGS += -DNO_C99_FORMAT
endif
+ifdef BROKEN_VSNPRINTF
+ COMPAT_CFLAGS += -DBROKEN_VSNPRINTF
+ COMPAT_OBJS += compat/vsnprintf.o
+endif
ifdef FREAD_READS_DIRECTORIES
COMPAT_CFLAGS += -DFREAD_READS_DIRECTORIES
COMPAT_OBJS += compat/fopen.o
diff --git a/config.mak.in b/config.mak.in
index ee6c33d..aaa98c6 100644
--- a/config.mak.in
+++ b/config.mak.in
@@ -46,3 +46,4 @@ NO_MKDTEMP=@NO_MKDTEMP@
NO_ICONV=@NO_ICONV@
OLD_ICONV=@OLD_ICONV@
NO_DEFLATE_BOUND=@NO_DEFLATE_BOUND@
+BROKEN_VSNPRINTF=@BROKEN_VSNPRINTF@
diff --git a/configure.ac b/configure.ac
index 85d7ef5..d4bb2b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -326,6 +326,37 @@ else
NO_C99_FORMAT=
fi
AC_SUBST(NO_C99_FORMAT)
+#
+# Define BROKEN_VSNPRINTF if your are on a system which vsnprintf() return
+# something else (typically -1) instead of number of characters which would
+# have been written to the final string if enough space had been available.
+AC_CACHE_CHECK([whether vsnprintf() is broken],
+ [ac_cv_broken_vsnprintf],
+[
+AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
+ #include "stdarg.h"
+
+ int test_vsnprintf(char *str, size_t maxsize, const char *format, ...)
+ {
+ int ret;
+ va_list ap;
+ va_start(ap, format);
+ ret = vsnprintf(str, maxsize, format, ap);
+ va_end(ap);
+ return ret;
+ }],
+ [[char buf[1];
+ if (test_vsnprintf(buf, 1, "%s", "12345") != 5) return 1]])],
+ [ac_cv_broken_vsnprintf=no],
+ [ac_cv_broken_vsnprintf=yes])
+])
+if test $ac_cv_broken_vsnprintf = yes; then
+ BROKEN_VSNPRINTF=UnfortunatelyYes
+else
+ BROKEN_VSNPRINTF=
+fi
+AC_SUBST(BROKEN_VSNPRINTF)
## Checks for library functions.
diff --git a/git-compat-util.h b/git-compat-util.h
index 2a40703..5c392f8 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -209,6 +209,12 @@ void *gitmemmem(const void *haystack, size_t haystacklen,
extern FILE *git_fopen(const char*, const char*);
#endif
+#ifdef BROKEN_VSNPRINTF
+#define vsnprintf git_vsnprintf
+extern int git_vsnprintf(char *str, size_t maxsize,
+ const char *format, va_list ap);
+#endif
+
#ifdef __GLIBC_PREREQ
#if __GLIBC_PREREQ(2, 1)
#define HAVE_STRCHRNUL
diff --git a/dev/null b/compat/vsnprintf.c
new file mode 100644
index 0000000..263e00e
--- /dev/null
+++ b/compat/vsnprintf.c
@@ -0,0 +1,20 @@
+#include "../git-compat-util.h"
+
+#undef vsnprintf
+int git_vsnprintf(char *str, size_t maxsize, const char *format, va_list ap);
+{
+ int ret = vsnprintf(s, maxsize, format, ap);
+ if (ret != -1 ) return ret;
+
+ s = NULL;
+ while ( ret == -1 )
+ {
+ maxsize = (maxsize*3)/2;
+ s = realloc(s, maxsize);
+ if (! s) return -1;
+ ret = vsnprintf(s, maxsize, format, ap);
+ }
+ free(s);
+ return ret;
+}
+
--
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