1 files changed, 92 insertions, 0 deletions
diff --git a/Build/source/texk/xdvik/my-vsnprintf.c b/Build/source/texk/xdvik/my-vsnprintf.c
new file mode 100644
index 00000000000..dc2b9b7603c
--- /dev/null
+++ b/Build/source/texk/xdvik/my-vsnprintf.c
@@ -0,0 +1,92 @@
+/*------------------------------------------------------------
+
+written by Stefan Ulrich <stefanulrich@users.sourceforge.net> 2001/02/25
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL PAUL VOJTA OR ANY OTHER AUTHOR OF THIS SOFTWARE BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------*/
+
+#include <string.h>
+#include <stdio.h>
+#include "xdvi-config.h"
+#include "xdvi.h"
+#include "my-vsnprintf.h"
+
+#if !HAVE_VSNPRINTF || !HAVE_GOOD_VSNPRINTF
+/*------------------------------------------------------------
+ *  my_vsnprintf - emulation of glibc2.1 vsnprintf, use if
+ *		   vsnprintf is not available	
+ *
+ *  Arguments:
+ *	char *buf	- buffer to print <format> string into
+ *	int len		- print only len characters of <format>
+ *	char *format	- format string
+ *	va_list argp	- variable argument list
+ *
+ *  Returns:
+ *	 int size - number of characters that would have been
+ *		    written if enough space had been available
+ *
+ *  Purpose:
+ *	Implementation of GNU's vsnprintf using POSIX pipes (less
+ *      portable and much slower than the original, but also much
+ *	easier to implement ;-):
+ *	Print the formatted string to a pipe and read back
+ *	at most len-1 characters, appending a '\0' at the end.
+ *------------------------------------------------------------*/
+
+int
+my_vsnprintf(char *buf, int len, const char *format, va_list argp)
+{
+    int pipe_fd[2];
+    FILE *fd;
+    int size;
+#ifdef DEBUG
+    printf("=============my_vsnprintf called!\n");
+#endif
+    len--;	/* for the trailing '\0' */
+    
+    /* create a pipe for reading/writing */
+    if (xpipe(pipe_fd) == -1) {
+	perror("my_vsnprintf: pipe");
+	xdvi_exit(EXIT_FAILURE);
+    }
+    if ((fd = try_fdopen(pipe_fd[1], "w")) == NULL) {
+	perror("my_vsnprintf: fdopen");
+	xdvi_exit(EXIT_FAILURE);
+    }
+    /* instead of setting fd to non-buffering, flush it explicitly: */
+    /*  setvbuf(fd, NULL, _IONBF, BUFSIZ); */
+    size = vfprintf(fd, format, argp);
+    fflush(fd);
+
+    /* wrote less characters than len -> adjust len for the subsequent read */
+    if (size < len) {
+	len = size;
+    }
+    read(pipe_fd[0], buf, len);
+    buf[len] = '\0';     /* always null-terminate */
+
+    fclose(fd);
+    close(pipe_fd[0]);
+    close(pipe_fd[1]);
+
+    return size;
+}
+
+#endif /* !HAVE_VSNPRINTF || !HAVE_GOOD_VSNPRINTF */