Add asprintf implementation for systems which lack it.

configure

@@ -180,6 +180,45 @@ EOF
   rm -f testconf*
 }
 
+asprintf_test()
+{
+  verbose asprintf_test
+  cat > testconf.c <<EOF
+#define _GNU_SOURCE
+#include <stdio.h>
+int main()
+{
+  asprintf( NULL, NULL );
+  return 0;
+}
+EOF
+  if runcmd $CC -o testconf testconf.c
+  then
+    CFLAGS="$CFLAGS -DHAVE_ASPRINTF"
+  fi
+  rm -f testconf*
+}
+
+snprintf_test()
+{
+  verbose snprintf_test
+  cat > testconf.c <<EOF
+#include <stdio.h>
+int main()
+{
+  char buf[] = "blueberry";
+  return ( 6 != snprintf( buf, 4, "%s%s", "foo", "bar" ) ||
+           0 != memcmp( buf, "foo\0berry", 9 ) );
+}
+EOF
+  if ! runcmd $CC -o testconf testconf.c || ! runcmd ./testconf
+  then
+    echo "error: broken snprintf() found"
+    exit 1
+  fi
+  rm -f testconf*
+}
+
 libgen_test()
 {
   verbose libgen_test
@@ -467,6 +506,8 @@ lrintf_test
 #
 strlcpy_test
 strlcat_test
+asprintf_test
+snprintf_test
 libgen_test
 
 #

libtransmission/trcompat.h

@@ -24,6 +24,7 @@
 #ifndef TRCOMPAT_H
 #define TRCOMPAT_H
 
+#include <stdarg.h>
 #include <stddef.h> /* for size_t */
 
 #ifndef HAVE_STRLCPY
@@ -36,6 +37,11 @@ size_t
 strlcat(char *dst, const char *src, size_t siz);
 #endif
 
+#ifndef HAVE_ASPRINTF
+int asprintf( char **, const char *, ... );
+int vasprintf( char **, const char *, va_list );
+#endif
+
 #ifdef HAVE_LIBGEN
 # include <libgen.h>
 #else

libtransmission/utils.c

@@ -28,7 +28,9 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h> /* usleep, stat */
+
 #include "transmission.h"
+#include "trcompat.h"
 
 #define SPRINTF_BUFSIZE         100
 
@@ -319,6 +321,44 @@ int tr_vsprintf( char ** buf, int * used, int * max, const char * fmt,
     return 0;
 }
 
+#ifndef HAVE_ASPRINTF
+
+int
+asprintf( char ** buf, const char * format, ... )
+{
+    va_list ap;
+    int     ret;
+
+    va_start( ap, format );
+    ret = vasprintf( buf, format, ap );
+    va_end( ap );
+
+    return ret;
+}
+
+int
+vasprintf( char ** buf, const char * format, va_list ap )
+{
+    va_list ap2;
+    int     ret, used, max;
+
+    va_copy( ap2, ap );
+
+    *buf = NULL;
+    used = 0;
+    max  = 0;
+
+    if( tr_vsprintf( buf, &used, &max, format, ap, ap2 ) )
+    {
+        free( *buf );
+        return -1;
+    }
+
+    return used;
+}
+
+#endif /* HAVE_ASPRINTF */
+
 int tr_concat( char ** buf, int * used, int * max, const char * data, int len )
 {
     int     newmax;