first commit

tools/vispatch-1.4.6/source/djlib/vsnprntf.c

@@ -0,0 +1,57 @@
+/* DJGPP < v2.04 doesn't have vsnprintf().  The following are
+ * copied over from DJGPP 2.04.  */
+
+/* Copyright (C) 2001 DJ Delorie, see COPYING.DJ for details */
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <limits.h>
+#include <errno.h>
+#include <libc/file.h>
+
+#if !defined(_IONTERM)
+#define _IONTERM 0 /* dummy value */
+#endif /*  _IONTERM */
+
+static __inline__ void __stropenw(FILE *p, char *str, int len)
+{
+  p->_flag = _IOWRT | _IOSTRG | _IONTERM;
+  p->_ptr = str;
+  p->_cnt = len;
+}
+
+static __inline__ void __strclosew(FILE *p)
+{
+  *p->_ptr = '\0';
+}
+
+int
+vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
+{
+  FILE _strbuf;
+  int len;
+
+  /* _cnt is an int in the FILE structure. To prevent wrap-around, we limit
+   * n to between 0 and INT_MAX inclusively. */
+  if (n > INT_MAX)
+  {
+    errno = EFBIG;
+    return -1;
+  }
+
+  memset(&_strbuf, 0, sizeof(_strbuf));
+
+  /* If n == 0, just querying how much space is needed. */
+  if (n > 0)
+    __stropenw(&_strbuf, str, n - 1);
+  else
+    __stropenw(&_strbuf, NULL, 0);
+
+  len = _doprnt(fmt, ap, &_strbuf);
+
+  /* Ensure nul termination */
+  if (n > 0)
+    __strclosew(&_strbuf);
+
+  return len;
+}