New APIs to write to sys.stdout or sys.stderr using a printf-like interface.
Adapted from code submitted by Just van Rossum.
PySys_WriteStdout(format, ...)
PySys_WriteStderr(format, ...)
The first function writes to sys.stdout; the second to sys.stderr. When
there is a problem, they write to the real (C level) stdout or stderr;
no exceptions are raised (but a pending exception may be cleared when a
new exception is caught).
Both take a printf-style format string as their first argument followed
by a variable length argument list determined by the format string.
*** WARNING ***
The format should limit the total size of the formatted output string to
1000 bytes. In particular, this means that no unrestricted "%s" formats
should occur; these should be limited using "%.<N>s where <N> is a
decimal number calculated so that <N> plus the maximum size of other
formatted text does not exceed 1000 bytes. Also watch out for "%f",
which can print hundreds of digits for very large numbers.
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index b3bb919..ae16baf 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -486,3 +486,93 @@
}
Py_DECREF(av);
}
+
+
+/* APIs to write to sys.stdout or sys.stderr using a printf-like interface.
+ Adapted from code submitted by Just van Rossum.
+
+ PySys_WriteStdout(format, ...)
+ PySys_WriteStderr(format, ...)
+
+ The first function writes to sys.stdout; the second to sys.stderr. When
+ there is a problem, they write to the real (C level) stdout or stderr;
+ no exceptions are raised (but a pending exception may be cleared when a
+ new exception is caught).
+
+ Both take a printf-style format string as their first argument followed
+ by a variable length argument list determined by the format string.
+
+ *** WARNING ***
+
+ The format should limit the total size of the formatted output string to
+ 1000 bytes. In particular, this means that no unrestricted "%s" formats
+ should occur; these should be limited using "%.<N>s where <N> is a
+ decimal number calculated so that <N> plus the maximum size of other
+ formatted text does not exceed 1000 bytes. Also watch out for "%f",
+ which can print hundreds of digits for very large numbers.
+
+ */
+
+static void
+mywrite(name, fp, format, va)
+ char *name;
+ FILE *fp;
+ const char *format;
+ va_list va;
+{
+ PyObject *file;
+
+ file = PySys_GetObject(name);
+ if (file == NULL || PyFile_AsFile(file) == fp)
+ vfprintf(fp, format, va);
+ else {
+ char buffer[1001];
+ vsprintf(buffer, format, va);
+ if (PyFile_WriteString(buffer, file) != 0) {
+ PyErr_Clear();
+ fputs(buffer, fp);
+ }
+ }
+}
+
+void
+#ifdef HAVE_STDARG_PROTOTYPES
+PySys_WriteStdout(const char *format, ...)
+#else
+PySys_WriteStdout(va_alist)
+ va_dcl
+#endif
+{
+ va_list va;
+
+#ifdef HAVE_STDARG_PROTOTYPES
+ va_start(va, format);
+#else
+ char *format;
+ va_start(va);
+ format = va_arg(va, char *);
+#endif
+ mywrite("stdout", stdout, format, va);
+ va_end(va);
+}
+
+void
+#ifdef HAVE_STDARG_PROTOTYPES
+PySys_WriteStderr(const char *format, ...)
+#else
+PySys_WriteStderr(va_alist)
+ va_dcl
+#endif
+{
+ va_list va;
+
+#ifdef HAVE_STDARG_PROTOTYPES
+ va_start(va, format);
+#else
+ char *format;
+ va_start(va);
+ format = va_arg(va, char *);
+#endif
+ mywrite("stderr", stderr, format, va);
+ va_end(va);
+}