#include <stdarg.h>
#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
#include "obstack.h"
#ifdef _WIN32
-#define vsnprintf _vsnprintf
+/* win32/C89 has no va_copy function... so we have to use the stupid fixed-length version */
+int obstack_vprintf(struct obstack *obst, const char *fmt, va_list ap) FIRM_NOTHROW
+{
+ char buf[16384];
+ int len = _vsnprintf(buf, sizeof(buf), fmt, ap);
+ obstack_grow(obst, buf, len);
+ return len;
+}
+#else
+int obstack_vprintf(struct obstack *obst, const char *fmt, va_list ap) FIRM_NOTHROW
+{
+ char buf[128];
+ char *buffer = buf;
+ size_t size = sizeof(buf);
+ int len;
+
+ for (;;) {
+ va_list tap;
+ va_copy(tap, ap);
+ len = vsnprintf(buffer, size, fmt, tap);
+
+ /* snprintf should return -1 only in the error case, but older glibcs
+ * and probably other systems are buggy in this respect and return -1 if
+ * the buffer was too small. We only abort for LARGE unrealistic buffer
+ * sizes here */
+ if (len < 0) {
+ if (buffer != buf)
+ free(buffer);
+ if (size > 65536)
+ return -1;
+ size *= 2;
+ } else if ((size_t)len >= size) {
+ /* If we come here more than once, vsnprintf() returned garbage */
+ assert(buffer == buf);
+ size = (size_t)len + 1;
+ } else {
+ break;
+ }
+ buffer = (char*)malloc(size);
+ }
+
+ obstack_grow(obst, buffer, len);
+ if (buffer != buf)
+ free(buffer);
+
+ return len;
+}
#endif
-int obstack_printf(struct obstack *obst, const char *fmt, ...)
+int obstack_printf(struct obstack *obst, const char *fmt, ...) FIRM_NOTHROW
{
- char buf[1024];
- va_list ap;
- int len;
+ va_list ap;
+ int res;
- va_start(ap, fmt);
- len = vsnprintf(buf, sizeof(buf), fmt, ap);
- obstack_grow(obst, buf, len);
- va_end(ap);
+ va_start(ap, fmt);
+ res = obstack_vprintf(obst, fmt, ap);
+ va_end(ap);
- return len;
+ return res;
}