update standards and safety checks

85 files changed, 232 insertions, 448 deletions

diff --git a/src/stdio/__printf.c b/src/stdio/__printf.c
index c918cac5..0d950583 100644
--- a/src/stdio/__printf.c
+++ b/src/stdio/__printf.c
@@ -1,13 +1,11 @@
-#if 0
-
-#include <sys/types.h>
+//#include <sys/types.h>
 #include <stdio.h>
 #include <stddef.h>
 #include "wctype/wint_t.h"
 #include "wctype/wctrans_t.h"
 #include <wchar.h>
 #include <inttypes.h>
-#include <unistd.h>
+//#include <unistd.h>
 #include <stdlib.h>
 #include "_stdio.h"
 
@@ -345,5 +343,7 @@ int (__printf)(struct io_options *opt, const char * format, va_list arg)
 	return nout;
 }
 
-
-#endif
+/*
+STDC(0)
+SIGNAL_SAFE(0)
+*/
diff --git a/src/stdio/__scanf.c b/src/stdio/__scanf.c
index 7451ad4a..ed837b44 100644
--- a/src/stdio/__scanf.c
+++ b/src/stdio/__scanf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdarg.h>
 #include <stdio.h>
 #include "_stdio.h"
@@ -12,5 +10,7 @@ int __scanf(struct io_options *opt, const char * format, va_list arg)
 	return 0;
 }
 
-
-#endif
+/*
+STDC(0)
+SIGNAL_SAFE(0)
+*/
diff --git a/src/stdio/__stderr.c b/src/stdio/__stderr.c
index 681398aa..654eb4c0 100644
--- a/src/stdio/__stderr.c
+++ b/src/stdio/__stderr.c
@@ -1,7 +1,7 @@
-#if 0
-
 #include <stdio.h>
 FILE *__stderr;
 
-
-#endif
+/*
+STDC(0)
+SIGNAL_SAFE(0)
+*/
diff --git a/src/stdio/__stdin.c b/src/stdio/__stdin.c
index 08b6fd5d..57741fa3 100644
--- a/src/stdio/__stdin.c
+++ b/src/stdio/__stdin.c
@@ -1,7 +1,7 @@
-#if 0
-
 #include <stdio.h>
 FILE *__stdin;
 
-
-#endif
+/*
+STDC(0)
+SIGNAL_SAFE(0)
+*/
diff --git a/src/stdio/__stdio.c b/src/stdio/__stdio.c
index 26f57b61..d77e01dc 100644
--- a/src/stdio/__stdio.c
+++ b/src/stdio/__stdio.c
@@ -1,8 +1,8 @@
-#if 0
-
 #include "_stdio.h"
 
 struct __stdio __stdio = { 0 };
 
-
-#endif
+/*
+STDC(0)
+SIGNAL_SAFE(0)
+*/
diff --git a/src/stdio/__stdout.c b/src/stdio/__stdout.c
index 8cf18d91..bf4270b6 100644
--- a/src/stdio/__stdout.c
+++ b/src/stdio/__stdout.c
@@ -1,7 +1,7 @@
-#if 0
-
 #include <stdio.h>
 FILE *__stdout;
 
-
-#endif
+/*
+STDC(0)
+SIGNAL_SAFE(0)
+*/
diff --git a/src/stdio/_stdio.h b/src/stdio/_stdio.h
index 80b83556..43d8841b 100644
--- a/src/stdio/_stdio.h
+++ b/src/stdio/_stdio.h
@@ -4,6 +4,7 @@
 #include <stddef.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include "_safety.h"
 
 #ifdef _POSIX_C_SOURCE
 #include <sys/types.h>
diff --git a/src/stdio/clearerr.c b/src/stdio/clearerr.c
index a3196a71..f7d2aac1 100644
--- a/src/stdio/clearerr.c
+++ b/src/stdio/clearerr.c
@@ -1,12 +1,12 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
+#include "_safety.h"
 
 /** reset file stream error indicator **/
 
 void clearerr(FILE * stream)
 {
+	SIGNAL_SAFE(0);
 	flockfile(stream);
 	if (stream != NULL) {
 		stream->eof = 0;
@@ -22,6 +22,3 @@ clears the error and end-of-file indicators of ARGUMENT(stream).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fclose.c b/src/stdio/fclose.c
index 8649c718..f438a9c2 100644
--- a/src/stdio/fclose.c
+++ b/src/stdio/fclose.c
@@ -1,15 +1,17 @@
-#if 0
-
 #ifndef _POSIX_SOURCE
 #define _POSIX_SOURCE
 #define POSIX_FORCED
 #endif
 
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#if 0
 #include <sys/types.h>
 #include <unistd.h>
+#endif
+
 #include "_stdio.h"
 
 #ifdef POSIX_FORCED
@@ -21,6 +23,8 @@
 
 int fclose(FILE *stream)
 {
+	SIGNAL_SAFE(0);
+
 	flockfile(stream);
 	if (fflush(stream) == EOF) {
 		/* set errno */
@@ -58,6 +62,3 @@ buffer was automatically allocated, it is freed.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fdopen.c b/src/stdio/fdopen.c
index 12bb1a10..875d5b9a 100644
--- a/src/stdio/fdopen.c
+++ b/src/stdio/fdopen.c
@@ -1,15 +1,13 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 FILE * fdopen(int fildes, const char * mode)
 {
+	SIGNAL_SAFE(0);
 	(void)fildes; (void)mode;
 	return NULL;
 }
+
 /*
 POSIX(1)
 */
-
-
-#endif
diff --git a/src/stdio/feof.c b/src/stdio/feof.c
index 8e00489c..39d9b645 100644
--- a/src/stdio/feof.c
+++ b/src/stdio/feof.c
@@ -1,13 +1,11 @@
-#if 0
-
 #include <stdio.h>
-#include "_assert.h"
 #include "_stdio.h"
 
 /** test for end-of-file **/
 
 int feof(FILE *stream)
 {
+	SIGNAL_SAFE(0);
 	ASSERT_NONNULL(stream);
 	flockfile(stream);
 
@@ -31,6 +29,3 @@ tests for the end-of-file indicator of ARGUMENT(stream).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/ferror.c b/src/stdio/ferror.c
index fb6adf0d..66299ab9 100644
--- a/src/stdio/ferror.c
+++ b/src/stdio/ferror.c
@@ -1,13 +1,11 @@
-#if 0
-
 #include <stdio.h>
-#include "_assert.h"
 #include "_stdio.h"
 
 /** tests the file stream error indicator **/
 
 int ferror(FILE *stream)
 {
+	SIGNAL_SAFE(0);
 	ASSERT_NONNULL(stream);
 	/*
 	RETURN(0, the error indicator is not set);
@@ -23,6 +21,3 @@ tests the error indicator of ARGUMENT(stream).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fflush.c b/src/stdio/fflush.c
index 8adb0a10..23899e82 100644
--- a/src/stdio/fflush.c
+++ b/src/stdio/fflush.c
@@ -1,13 +1,11 @@
-#if 0
-
 #ifndef _POSIX_SOURCE
 #define _POSIX_SOURCE
 #define POSIX_FORCED
 #endif
 
 #include <stdio.h>
-#include <sys/types.h>
-#include <unistd.h>
+//#include <sys/types.h>
+//#include <unistd.h>
 #include "_stdio.h"
 
 #ifdef POSIX_FORCED
@@ -21,6 +19,8 @@ int fflush(FILE *stream)
 {
 	int ret = 0;
 
+	SIGNAL_SAFE(0);
+
 	if (stream == NULL) {
 		size_t i;
 		for (i = 0; i < FOPEN_MAX; i++) {
@@ -63,6 +63,3 @@ UNDEFINED(ARGUMENT(stream) is not an output stream)
 UNDEFINED(ARGUMENT(stream) is an update stream in which the most recent operation was input)
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fgetc.c b/src/stdio/fgetc.c
index b3dde1bd..06e4c064 100644
--- a/src/stdio/fgetc.c
+++ b/src/stdio/fgetc.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
@@ -13,6 +11,7 @@
 
 int fgetc(FILE *stream)
 {
+	SIGNAL_SAFE(0);
 	flockfile(stream);
 	char c = getc_unlocked(stream);
 	funlockfile(stream);
@@ -34,6 +33,3 @@ of ARGUMENT(stream) is advanced.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fgetpos.c b/src/stdio/fgetpos.c
index b0b25161..65b35cf7 100644
--- a/src/stdio/fgetpos.c
+++ b/src/stdio/fgetpos.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
@@ -7,6 +5,8 @@
 
 int fgetpos(FILE * restrict stream, fpos_t * restrict pos)
 {
+	SIGNAL_SAFE(0);
+
 	flockfile(stream);
 	*pos = stream->pos;
 	funlockfile(stream);
@@ -22,6 +22,3 @@ for ARGUMENT(stream) into the TYPEDEF(fpos_t) at ARGUMENT(pos).
 UNSPECIFIED(The information stored in TYPEDEF(fpos_t))
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fgets.c b/src/stdio/fgets.c
index 8606fdea..8e7bf449 100644
--- a/src/stdio/fgets.c
+++ b/src/stdio/fgets.c
@@ -1,13 +1,14 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
+#undef fgets
 
 /** read a string of characters from a file stream **/
 
 char * fgets(char * restrict s, int n, FILE * restrict stream)
 {
 	int i = 0;
+	SIGNAL_SAFE(0);
+
 	if (feof(stream)) {
 		return NULL;
 	}
@@ -55,6 +56,3 @@ If an error occurs, the contents of ARGUMENT(s) are indeterminite.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fileno.c b/src/stdio/fileno.c
index 7a6cbd7c..5432ecb0 100644
--- a/src/stdio/fileno.c
+++ b/src/stdio/fileno.c
@@ -1,17 +1,13 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
-#include "_assert.h"
 
 int fileno(FILE * stream)
 {
+	SIGNAL_SAFE(0);
 	ASSERT_NONNULL(stream);
 	return stream->fd;
 }
+
 /*
 POSIX(1)
 */
-
-
-#endif
diff --git a/src/stdio/flockfile.c b/src/stdio/flockfile.c
index 8b3efee5..62397e74 100644
--- a/src/stdio/flockfile.c
+++ b/src/stdio/flockfile.c
@@ -1,14 +1,12 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 void flockfile(FILE * file)
 {
+	SIGNAL_SAFE(0);
+	ASSERT_NONNULL(file);
 }
 
 /*
 POSIX(199506)
 */
-
-
-#endif
diff --git a/src/stdio/fopen.c b/src/stdio/fopen.c
index d20015ca..b62491bc 100644
--- a/src/stdio/fopen.c
+++ b/src/stdio/fopen.c
@@ -1,9 +1,8 @@
-#if 0
-
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include "_stdio.h"
+#undef fopen
 
 /** open a file stream **/
 
@@ -12,6 +11,8 @@ FILE * fopen(const char * restrict filename, const char * restrict mode)
 	FILE *f = NULL;
 	size_t i;
 
+	SIGNAL_SAFE(0);
+
 	for (i = 0; i < FOPEN_MAX; i++) {
 		if (__stdio.FILES[i].bmode == 0) {
 			f = &(__stdio.FILES[i]);
@@ -65,6 +66,3 @@ The error and end-of-file indicators are cleared.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fopen_s.c b/src/stdio/fopen_s.c
index 708a1fc2..411f6bbf 100644
--- a/src/stdio/fopen_s.c
+++ b/src/stdio/fopen_s.c
@@ -1,18 +1,15 @@
-#if 0
-
 #include <stdio.h>
-#include "__stdio.h"
+#include "_stdio.h"
 #include <string.h>
 #include <stdlib.h>
-#include <fcntl.h>
-#include <unistd.h>
 
 /** open a file stream **/
 errno_t fopen_s(FILE * restrict * restrict streamptr,
 	const char * restrict filename,
-	const char * restrict mode);
+	const char * restrict mode)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
+	(void)streamptr; (void)filename; (void)mode;
 	return 0;
 }
 
@@ -55,6 +52,3 @@ The error and end-of-file indicators are cleared.
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/fprintf.c b/src/stdio/fprintf.c
index 668843e0..72bca8c4 100644
--- a/src/stdio/fprintf.c
+++ b/src/stdio/fprintf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdarg.h>
 #include <stdio.h>
 #include "_stdio.h"
@@ -11,6 +9,9 @@ int fprintf(FILE * restrict stream, const char * restrict format, ...)
 	int ret = 0;
 	va_list ap;
 	struct io_options opt = {0};
+
+	SIGNAL_SAFE(0);
+
 	opt.fnname = "fprintf";
 	opt.stream = stream;
 	va_start(ap, format);
@@ -31,6 +32,3 @@ and the variadic arguments is the same as that for FUNCTION(printf).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fprintf_s.c b/src/stdio/fprintf_s.c
index 1c50f26d..2e5ed670 100644
--- a/src/stdio/fprintf_s.c
+++ b/src/stdio/fprintf_s.c
@@ -1,12 +1,11 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
+#include "_stdio.h"
 
 /** write formatted output to a file stream **/
 int fprintf_s(FILE * restrict stream, const char * restrict format, ...)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
 	int retval;
 	va_list ap;
 	va_start(ap, format);
@@ -31,6 +30,3 @@ of arg(format) and the variadic arguments is the same as that for fn(printf).
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/fputc.c b/src/stdio/fputc.c
index b551541d..1a17ba32 100644
--- a/src/stdio/fputc.c
+++ b/src/stdio/fputc.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
@@ -11,9 +9,10 @@
 
 /** write a character to a file stream **/
 
-int fputc(int c, FILE *stream)
+int (fputc)(int c, FILE *stream)
 {
 	int ret = EOF;
+	SIGNAL_SAFE(0);
 	flockfile(stream);
 	ret = putc_unlocked(c, stream);
 	funlockfile(stream);
@@ -35,6 +34,3 @@ RETURN_SUCCESS(ARGUMENT(c))
 RETURN_FAILURE(CONSTANT(EOF))
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fputs.c b/src/stdio/fputs.c
index 9d6a9c90..a82338d1 100644
--- a/src/stdio/fputs.c
+++ b/src/stdio/fputs.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
@@ -7,6 +5,7 @@
 
 int fputs(const char * restrict s, FILE * restrict stream)
 {
+	SIGNAL_SAFE(0);
 	flockfile(stream);
 	while (*s) {
 		if (fputc(*s++, stream) == EOF) {
@@ -30,6 +29,3 @@ the terminating CHAR(\0) character.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fread.c b/src/stdio/fread.c
index b1b077dd..5b7f38b4 100644
--- a/src/stdio/fread.c
+++ b/src/stdio/fread.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
@@ -9,6 +7,9 @@ size_t fread(void * restrict ptr, size_t size, size_t nmemb, FILE * restrict str
 {
 	unsigned char *buf = ptr;
 	size_t n = 0;
+
+	SIGNAL_SAFE(0);
+
 	flockfile(stream);
 	while (nmemb) {
 		size_t i;
@@ -41,6 +42,3 @@ The file position indicate is advanced by the number of bytes read.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/freopen.c b/src/stdio/freopen.c
index cee31692..b39fda4c 100644
--- a/src/stdio/freopen.c
+++ b/src/stdio/freopen.c
@@ -1,16 +1,14 @@
-#if 0
-
 #ifndef _POSIX_SOURCE
 #define _POSIX_SOURCE
 #define POSIX_FORCED
 #endif
 
-#include <sys/types.h>
+//#include <sys/types.h>
 #include <errno.h>
-#include <fcntl.h>
+//#include <fcntl.h>
 #include <stdio.h>
 #include <string.h>
-#include <unistd.h>
+//#include <unistd.h>
 #include "_stdio.h"
 
 #ifdef POSIX_FORCED
@@ -18,6 +16,12 @@
 #include "_syscall.h"
 #define open(_p, _f, _m)	__scall3(open, _p, _f, _m)
 #define isatty(_fd)		ioctl(_fd, TCFLSH, 0)
+#define O_RDONLY 00
+#define O_WRONLY 01
+#define O_CREAT 0100
+#define O_TRUNC 01000
+#define O_APPEND 02000
+#define O_RDWR 02
 #endif
 
 /** reopen a file stream with a new file **/
@@ -53,6 +57,8 @@ FILE * freopen(const char * restrict filename, const char * restrict mode, FILE
 	size_t i;
 	int fd = -1;
 
+	SIGNAL_SAFE(0);
+
 	for (i = 0; i < sizeof(modemap) / sizeof(modemap[0]); i++) {
 		if (!strcmp(modemap[i].smode, mode)) {
 			openmode = modemap[i].omode;
@@ -108,6 +114,3 @@ The error and end-of-file indicators are cleared.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/freopen_s.c b/src/stdio/freopen_s.c
index e49c7cf1..c5105b13 100644
--- a/src/stdio/freopen_s.c
+++ b/src/stdio/freopen_s.c
@@ -1,8 +1,5 @@
-#if 0
-
 #include <stdio.h>
-#include "__stdio.h"
-#include <fcntl.h>
+#include "_stdio.h"
 #include <string.h>
 
 /** reopen a file stream with a new file **/
@@ -11,7 +8,8 @@ errno_t freopen_s(FILE * restrict * restrict newstreamptr,
 	const char * restrict mode,
 	FILE * restrict stream)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
+	(void)newstreamptr; (void)filename; (void)mode; (void)stream;
 	return 0;
 }
 
@@ -36,6 +34,3 @@ The error and end-of-file indicators are cleared.
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/fscanf.c b/src/stdio/fscanf.c
index 17d0c038..98dbeed1 100644
--- a/src/stdio/fscanf.c
+++ b/src/stdio/fscanf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdarg.h>
 #include <stdio.h>
 #include "_stdio.h"
@@ -11,6 +9,9 @@ int fscanf(FILE * restrict stream, const char * restrict format, ...)
 	int ret = 0;
 	va_list ap;
 	struct io_options opt = {0};
+
+	SIGNAL_SAFE(0);
+
 	opt.fnname = "fscanf";
 	opt.stream = stream;
 	va_start(ap, format);
@@ -31,6 +32,3 @@ the variadic arguments is the same as that for FUNCTION(scanf).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fscanf_s.c b/src/stdio/fscanf_s.c
index 77ca35d0..4d01ba5e 100644
--- a/src/stdio/fscanf_s.c
+++ b/src/stdio/fscanf_s.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
+#include "_stdio.h"
 
 /** read formatted input from a file stream **/
 int fscanf_s(FILE * restrict stream, const char * restrict format, ...)
 {
+	SIGNAL_SAFE(0);
 	va_list ap;
 	va_start(ap, format);
 	int ret = vfscanf_s(stream, format, ap);
@@ -29,6 +29,3 @@ arg(format) at the variadic arguments is the same as that for fn(scanf).
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/fseek.c b/src/stdio/fseek.c
index fb40fa70..e1c6db57 100644
--- a/src/stdio/fseek.c
+++ b/src/stdio/fseek.c
@@ -1,11 +1,12 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** set the file position indicator **/
 
 int fseek(FILE *stream, long int offset, int whence)
 {
+	SIGNAL_SAFE(0);
+
 	(void)stream; (void)offset;
 
 	if (whence == SEEK_CUR) {
@@ -34,6 +35,3 @@ UNDEFINED(Specifying CONSTANT(SEEK_END) for ARGUMENT(whence) on a binary file)
 UNDEFINED(Specifying a value for ARGUMENT(offset) other than 0 or a previous return value of FUNCTION(ftell) on a text file)
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/fsetpos.c b/src/stdio/fsetpos.c
index f56aef48..ca6cb806 100644
--- a/src/stdio/fsetpos.c
+++ b/src/stdio/fsetpos.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** set the file position indicator **/
 
 int fsetpos(FILE *stream, const fpos_t *pos)
 {
+	SIGNAL_SAFE(0);
 	(void)stream; (void)pos;
 	/* TODO */
 	return 1;
@@ -23,6 +23,3 @@ any characters pushed back with FUNCTION(ungetc).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/ftell.c b/src/stdio/ftell.c
index 521af102..f68c18b2 100644
--- a/src/stdio/ftell.c
+++ b/src/stdio/ftell.c
@@ -1,11 +1,12 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** get the file position indicator **/
 
 long int ftell(FILE *stream)
 {
+	SIGNAL_SAFE(0);
+
 	(void)stream;
 	/* TODO */
 	/*
@@ -25,6 +26,3 @@ For binary streams, the indicator is the current byte position.
 UNSPECIFIED(The meaning of the file position indicator for text streams)
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/funlockfile.c b/src/stdio/funlockfile.c
index 76780b37..978aded2 100644
--- a/src/stdio/funlockfile.c
+++ b/src/stdio/funlockfile.c
@@ -1,14 +1,11 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 void funlockfile(FILE * file)
 {
+	SIGNAL_SAFE(0);
 }
 
 /*
 POSIX(199506)
 */
-
-
-#endif
diff --git a/src/stdio/fwrite.c b/src/stdio/fwrite.c
index 724e0c29..52861b00 100644
--- a/src/stdio/fwrite.c
+++ b/src/stdio/fwrite.c
@@ -1,6 +1,5 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** write directly to a file stream **/
 
@@ -8,6 +7,8 @@ size_t fwrite(const void * restrict ptr, size_t size, size_t nmemb, FILE * restr
 {
 	unsigned char *buf = (unsigned char *)ptr;
 	size_t n = 0;
+	SIGNAL_SAFE(0);
+
 	while (nmemb) {
 		size_t i;
 		for (i = 0; i < size; i++) {
@@ -38,6 +39,3 @@ written.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/getc.c b/src/stdio/getc.c
index b4b8c854..4cb6290c 100644
--- a/src/stdio/getc.c
+++ b/src/stdio/getc.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** read a character from a file stream **/
 
 int getc(FILE *stream)
 {
+	SIGNAL_SAFE(0);
 	/*
 	RETURN_SUCCESS(the next character);
 	RETURN_FAILURE(CONSTANT(EOF));
@@ -21,6 +21,3 @@ defined as a macro, it may evaluate ARGUMENT(stream) more than once.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/getc_unlocked.c b/src/stdio/getc_unlocked.c
index 038e2cf0..140e1a4d 100644
--- a/src/stdio/getc_unlocked.c
+++ b/src/stdio/getc_unlocked.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
@@ -15,6 +13,8 @@ int getc_unlocked(FILE * stream)
 {
 	char c = 0;
 
+	SIGNAL_SAFE(0);
+
 	if (!stream) {
 		return EOF;
 	}
@@ -30,6 +30,3 @@ int getc_unlocked(FILE * stream)
 /*
 POSIX(199506)
 */
-
-
-#endif
diff --git a/src/stdio/getchar.c b/src/stdio/getchar.c
index 2d229847..faee8889 100644
--- a/src/stdio/getchar.c
+++ b/src/stdio/getchar.c
@@ -1,11 +1,12 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
+#undef getchar
 
 /** read a character from stdin **/
 
 int getchar(void)
 {
+	SIGNAL_SAFE(0);
 	/*
 	RETURN_SUCCESS(the next character);
 	RETURN_FAILURE(CONSTANT(EOF));
@@ -20,6 +21,3 @@ reads the next character from ARGUMENT(stdin).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/getchar_unlocked.c b/src/stdio/getchar_unlocked.c
index 886d5016..c62ffbf0 100644
--- a/src/stdio/getchar_unlocked.c
+++ b/src/stdio/getchar_unlocked.c
@@ -1,15 +1,11 @@
-#if 0
-
 #include <stdio.h>
 
 int getchar_unlocked(void)
 {
+	SIGNAL_SAFE(0);
 	return getc_unlocked(stdin);
 }
 
 /*
 POSIX(199506)
 */
-
-
-#endif
diff --git a/src/stdio/gets.c b/src/stdio/gets.c
index 261417c7..21ef3597 100644
--- a/src/stdio/gets.c
+++ b/src/stdio/gets.c
@@ -1,12 +1,12 @@
-#if 0
-
 #include <stdio.h>
 #include <limits.h>
+#include "_stdio.h"
 
 /** read a line from stdin **/
 
 char * gets(char *s)
 {
+	SIGNAL_SAFE(0);
 	/*
 	RETURN_SUCCESS(ARGUMENT(s));
 	RETURN_FAILURE(CONSTANT(NULL));
@@ -30,6 +30,3 @@ remain unchanged.
 /*
 STDC(1,201112)
 */
-
-
-#endif
diff --git a/src/stdio/gets_s.c b/src/stdio/gets_s.c
index 3cbe4d86..f6b453aa 100644
--- a/src/stdio/gets_s.c
+++ b/src/stdio/gets_s.c
@@ -1,12 +1,12 @@
-#if 0
-
 #include <stdio.h>
 #include <limits.h>
+#include "_stdio.h"
 
 /** read a line from stdin **/
 char * gets_s(char *s, rsize_t n)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
+	(void)n;
 	return fgets(s, INT_MAX, stdin);
 }
 
@@ -33,6 +33,3 @@ remain unchanged.
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/getw.c b/src/stdio/getw.c
index 6476781c..ad1b0bad 100644
--- a/src/stdio/getw.c
+++ b/src/stdio/getw.c
@@ -1,17 +1,14 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 # define _XOPEN_LEGACY 500
 
 int getw(FILE *stream)
 {
+	SIGNAL_SAFE(0);
 	return 0;
 }
 
 /*
 XOPEN(4,600)
 */
-
-
-#endif
diff --git a/src/stdio/pclose.c b/src/stdio/pclose.c
index 1d7a5b19..b39cfa15 100644
--- a/src/stdio/pclose.c
+++ b/src/stdio/pclose.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/wait.h>
@@ -9,6 +7,8 @@ int pclose(FILE * stream)
 {
 	int status;
 	pid_t child = stream->pipe_pid;
+	SIGNAL_SAFE(0);
+
 	if (child == 0) {
 		/* undefined behavior */
 	}
@@ -22,7 +22,3 @@ int pclose(FILE * stream)
 /*
 POSIX(2)
 */
-
-
-
-#endif
diff --git a/src/stdio/perror.c b/src/stdio/perror.c
index 8053a5dc..88e582de 100644
--- a/src/stdio/perror.c
+++ b/src/stdio/perror.c
@@ -1,13 +1,14 @@
-#if 0
-
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
+#include "_stdio.h"
 
 /** print an error message **/
 
 void perror(const char *s)
 {
+	SIGNAL_SAFE(0);
+
 	if (s != NULL && *s != '\0') {
 		fprintf(stderr, "%s: ", s);
 	}
@@ -28,6 +29,3 @@ pointed to by ARGUMENT(s), a colon (CHAR(:)), and a space.
 POSIX_(L_C_MESSAGES)
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/popen.c b/src/stdio/popen.c
index 550c8fda..67b70f4d 100644
--- a/src/stdio/popen.c
+++ b/src/stdio/popen.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
@@ -7,7 +5,6 @@
 #include <sys/types.h>
 #include <unistd.h"
 
-#include "_assert.h"
 #include "_stdio.h"
 
 #ifdef __STDC_VERSION__
@@ -16,6 +13,7 @@
 
 FILE * popen(const char * command, const char * mode)
 {
+	SIGNAL_SAFE(0);
 	ASSERT_NONNULL(command);
 	ASSERT_NONNULL(mode);
 	
@@ -71,7 +69,3 @@ FILE * popen(const char * command, const char * mode)
 /*
 POSIX(2)
 */
-
-
-
-#endif
diff --git a/src/stdio/printf.c b/src/stdio/printf.c
index f28240f4..6f8746c8 100644
--- a/src/stdio/printf.c
+++ b/src/stdio/printf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdarg.h>
 #include <stdio.h>
 #include "_stdio.h"
@@ -11,6 +9,9 @@ int printf(const char *format, ...)
 	int ret = 0;
 	va_list ap;
 	struct io_options opt = {0};
+
+	SIGNAL_SAFE(0);
+
 	opt.fnname = "printf";
 	opt.stream = stdout;
 	va_start(ap, format);
@@ -108,6 +109,3 @@ UNDEFINED(`Precision with a conversion specifier other than CHAR(d), CHAR(i), CH
 UNDEFINED(TODO: Using h or l for !(diouxXn) or L for !(eEfgG))
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/printf_s.c b/src/stdio/printf_s.c
index 408c9d72..92b4ca7c 100644
--- a/src/stdio/printf_s.c
+++ b/src/stdio/printf_s.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
+#include "_stdio.h"
 
 /** write formatted output **/
 int printf_s(const char *format, ...)
 {
+	SIGNAL_SAFE(0);
 	va_list ap;
 	va_start(ap, format);
 	int ret = vfprintf_s(stdout, format, ap);
@@ -30,6 +30,3 @@ FIXME: printf format goes here
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/putc.c b/src/stdio/putc.c
index 5a0836dd..8dc2024f 100644
--- a/src/stdio/putc.c
+++ b/src/stdio/putc.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** write a character to a file stream **/
 
 int putc(int c, FILE *stream)
 {
+	SIGNAL_SAFE(0);
 	/*
 	RETURN_SUCCESS(ARGUMENT(c));
 	RETURN_FAILURE(CONSTANT(EOF));
@@ -21,6 +21,3 @@ as a macro, it may evaluate ARGUMENT(stream) more than once.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/putc_unlocked.c b/src/stdio/putc_unlocked.c
index 4ff4c2e2..fffb2618 100644
--- a/src/stdio/putc_unlocked.c
+++ b/src/stdio/putc_unlocked.c
@@ -1,8 +1,5 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
-#include "_assert.h"
 
 #ifdef _POSIX_SOURCE
 #include <sys/types.h>
@@ -18,6 +15,7 @@ int putc_unlocked(int c, FILE *stream)
 {
 	unsigned char ch = (unsigned char)c;
 
+	SIGNAL_SAFE(0);
 	ASSERT_NONNULL(stream);
 	
 	stream->buf[stream->bpos++] = ch;
@@ -43,6 +41,3 @@ RETURN_SUCCESS(ARGUMENT(c))
 RETURN_FAILURE(CONSTANT(EOF))
 POSIX(199506)
 */
-
-
-#endif
diff --git a/src/stdio/putchar.c b/src/stdio/putchar.c
index d42a0836..21f1559e 100644
--- a/src/stdio/putchar.c
+++ b/src/stdio/putchar.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** write a character to stdout **/
 
 int putchar(int c)
 {
+	SIGNAL_SAFE(0);
 	/*
 	RETURN_SUCCESS(c);
 	RETURN_FAILURE(CONSTANT(EOF));
@@ -21,6 +21,3 @@ IDENTIFIER(stdout).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/putchar_unlocked.c b/src/stdio/putchar_unlocked.c
index be048b20..f998bf10 100644
--- a/src/stdio/putchar_unlocked.c
+++ b/src/stdio/putchar_unlocked.c
@@ -1,15 +1,11 @@
-#if 0
-
 #include <stdio.h>
 
 int putchar_unlocked(int c)
 {
+	SIGNAL_SAFE(0);
 	return putc_unlocked(c, stdout);
 }
 
 /*
 POSIX(199506)
 */
-
-
-#endif
diff --git a/src/stdio/puts.c b/src/stdio/puts.c
index 1e73158c..3392228e 100644
--- a/src/stdio/puts.c
+++ b/src/stdio/puts.c
@@ -1,14 +1,14 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
-/** write a string to stoud **/
+/** write a string to stdout **/
 
 int puts(const char *s)
 {
 	int ret = 1;
 
+	SIGNAL_SAFE(0);
+
 	flockfile(stdout);
 
 	while (*s) {
@@ -41,6 +41,3 @@ followed by a newline. The terminated CHAR(\0) is not written.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/putw.c b/src/stdio/putw.c
index 19ea92b7..fb18c445 100644
--- a/src/stdio/putw.c
+++ b/src/stdio/putw.c
@@ -1,16 +1,14 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 # define _XOPEN_LEGACY 500
 
 int putw(int w, FILE *stream)
 {
+	SIGNAL_SAFE(0);
+	(void)w; (void)stream;
 }
 
 /*
 XOPEN(4,600)
 */
-
-
-#endif
diff --git a/src/stdio/remove.c b/src/stdio/remove.c
index 56c678db..2ac91743 100644
--- a/src/stdio/remove.c
+++ b/src/stdio/remove.c
@@ -1,5 +1,4 @@
 #if 0
-
 #ifndef _POSIX_SOURCE
 #define _POSIX_SOURCE
 #define POSIX_FORCED
@@ -22,6 +21,9 @@
 int remove(const char *filename)
 {
 	struct stat st;
+
+	SIGNAL_SAFE(0);
+
 	stat(filename, &st);
 	if (S_ISDIR(st.st_mode)) {
 		return rmdir(filename);
@@ -39,5 +41,4 @@ IMPLEMENTATION(Whether the file is removed if it is open)
 STDC(1)
 */
 
-
 #endif
diff --git a/src/stdio/rename.c b/src/stdio/rename.c
index 3a736287..84d0df35 100644
--- a/src/stdio/rename.c
+++ b/src/stdio/rename.c
@@ -1,13 +1,13 @@
-#if 0
-
 #include <errno.h>
 #include <stdio.h>
+#include "_stdio.h"
 #include "_syscall.h"
 
 /** rename a file **/
 
 int rename(const char *old, const char *new)
 {
+	SIGNAL_SAFE(0);
 	SYSCALL(rename, int, -1, old, new, 0, 0, 0, 0);
 }
 
@@ -20,6 +20,3 @@ ARGUMENT(new).
 IMPLEMENTATION(Behavior if ARGUMENT(new) exists prior to THIS() being called)
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/rewind.c b/src/stdio/rewind.c
index 200534fe..1cdeee44 100644
--- a/src/stdio/rewind.c
+++ b/src/stdio/rewind.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** reset file position indicator **/
 
 void rewind(FILE *stream)
 {
+	SIGNAL_SAFE(0);
 	fseek(stream, 0L, SEEK_SET);
 	clearerr(stream);
 }
@@ -18,6 +18,3 @@ beginning of the file. The error indicator will be cleared.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/scanf.c b/src/stdio/scanf.c
index b75eb59e..d7de9a7c 100644
--- a/src/stdio/scanf.c
+++ b/src/stdio/scanf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdarg.h>
 #include <stdio.h>
 #include "_stdio.h"
@@ -11,6 +9,9 @@ int scanf(const char * restrict format, ...)
 	int ret = 0;
 	va_list ap;
 	struct io_options opt = {0};
+
+	SIGNAL_SAFE(0);
+
 	opt.fnname = "scanf";
 	opt.stream = stdout;
 	va_start(ap, format);
@@ -32,6 +33,3 @@ FIXME: scanf format goes here
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/scanf_s.c b/src/stdio/scanf_s.c
index 2d31e597..d4618cd7 100644
--- a/src/stdio/scanf_s.c
+++ b/src/stdio/scanf_s.c
@@ -1,11 +1,12 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
+#include "_stdio.h"
 
 /** read formatted input **/
 int scanf_s(const char * restrict format, ...)
 {
+	SIGNAL_SAFE(0);
+
 	va_list ap;
 	va_start(ap, format);
 	int ret = vfscanf_s(stdin, format, ap);
@@ -30,6 +31,3 @@ FIXME: scanf format goes here
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/setbuf.c b/src/stdio/setbuf.c
index ce8ad682..ddf38856 100644
--- a/src/stdio/setbuf.c
+++ b/src/stdio/setbuf.c
@@ -1,11 +1,12 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** specify file stream buffer **/
 
 void setbuf(FILE * restrict stream, char * restrict buf)
 {
+	SIGNAL_SAFE(0);
+
 	if (buf) {
 		setvbuf(stream, buf, _IOFBF, BUFSIZ);
 	} else {
@@ -26,6 +27,3 @@ equivalent of:
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/setvbuf.c b/src/stdio/setvbuf.c
index 5b143ecd..a6f37fb0 100644
--- a/src/stdio/setvbuf.c
+++ b/src/stdio/setvbuf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -9,6 +7,8 @@
 
 int setvbuf(FILE *stream, char *buf, int mode, size_t size)
 {
+	SIGNAL_SAFE(0);
+
 	flockfile(stream);
 
 	if (!f_is_open(stream)) {
@@ -78,6 +78,3 @@ The ARGUMENT(size) argument specifies the size of the buffer.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/snprintf.c b/src/stdio/snprintf.c
index 9cac9a7f..9bf6d17b 100644
--- a/src/stdio/snprintf.c
+++ b/src/stdio/snprintf.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
 #include "_stdio.h"
 
 int snprintf(char * restrict s, size_t n, const char * restrict format, ...)
 {
+	SIGNAL_SAFE(0);
+
 	struct io_options opt = {
 		.fnname = __func__,
 		.string = s,
@@ -23,6 +23,3 @@ int snprintf(char * restrict s, size_t n, const char * restrict format, ...)
 /*
 STDC(199901)
 */
-
-
-#endif
diff --git a/src/stdio/snprintf_s.c b/src/stdio/snprintf_s.c
index 7856fd40..aa7768f9 100644
--- a/src/stdio/snprintf_s.c
+++ b/src/stdio/snprintf_s.c
@@ -1,15 +1,13 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 int snprintf_s( char * restrict s, rsize_t n, const char * restrict format, ...)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
+	(void)s; (void)n; (void)format;
+	return 0;
 }
 
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/sprintf.c b/src/stdio/sprintf.c
index cd3fe63b..ab1729b2 100644
--- a/src/stdio/sprintf.c
+++ b/src/stdio/sprintf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdarg.h>
 #include <stdio.h>
 #include "_stdio.h"
@@ -11,6 +9,9 @@ int sprintf(char * restrict s, const char * restrict format, ...)
 	int ret = 0;
 	va_list ap;
 	struct io_options opt = {0};
+
+	SIGNAL_SAFE(0);
+
 	opt.fnname = "sprintf";
 	opt.string = s;
 	opt.maxlen = (size_t)-1;
@@ -32,6 +33,3 @@ FUNCTION(printf).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/sprintf_s.c b/src/stdio/sprintf_s.c
index dd70f149..81613ecb 100644
--- a/src/stdio/sprintf_s.c
+++ b/src/stdio/sprintf_s.c
@@ -1,11 +1,14 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
+#include "_stdio.h"
 
 /** write formatted output to a string **/
 int sprintf_s(char * restrict s, rsize_t n, const char * restrict format, ...)
 {
+	SIGNAL_SAFE(0);
+
+	(void)n;
+
 	va_list ap;
 	va_start(ap, format);
 	int ret = vsprintf(s, format, ap);
@@ -29,6 +32,3 @@ fn(printf).
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/sscanf.c b/src/stdio/sscanf.c
index 520e0669..125a49f6 100644
--- a/src/stdio/sscanf.c
+++ b/src/stdio/sscanf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdarg.h>
 #include <stdio.h>
 #include "_stdio.h"
@@ -11,6 +9,9 @@ int sscanf(const char * restrict s, const char * restrict format, ...)
 	int ret = 0;
 	va_list ap;
 	struct io_options opt = {0};
+
+	SIGNAL_SAFE(0);
+
 	opt.fnname = "sscanf";
 	opt.string = (char *)s;
 	va_start(ap, format);
@@ -32,6 +33,3 @@ FUNCTION(scanf).
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/sscanf_s.c b/src/stdio/sscanf_s.c
index be9033aa..20249496 100644
--- a/src/stdio/sscanf_s.c
+++ b/src/stdio/sscanf_s.c
@@ -1,11 +1,12 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
+#include "_stdio.h"
 
 /** read formatted input from a string **/
 int sscanf_s(const char * restrict s, const char * restrict format, ...)
 {
+	SIGNAL_SAFE(0);
+
 	va_list ap;
 	va_start(ap, format);
 	int ret = vsscanf(s, format, ap);
@@ -30,6 +31,3 @@ fn(scanf).
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/tempnam.c b/src/stdio/tempnam.c
index 719f94ca..e40ec537 100644
--- a/src/stdio/tempnam.c
+++ b/src/stdio/tempnam.c
@@ -1,15 +1,12 @@
-#if 0
-
 #include <stdio.h>
 
 char * tempnam(const char * dir, const char * pfx)
 {
+	SIGNAL_SAFE(0);
+	(void)dir; (void)pfx;
 	return NULL;
 }
 
 /*
 XOPEN(4)
 */
-
-
-#endif
diff --git a/src/stdio/tmpfile.c b/src/stdio/tmpfile.c
index b7ae0e77..f19bbdcf 100644
--- a/src/stdio/tmpfile.c
+++ b/src/stdio/tmpfile.c
@@ -1,13 +1,17 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
+#undef tmpfile
 
 /** open a temporary file stream **/
 
 FILE * tmpfile(void)
 {
 	char *path = "FIXME: A temporary file name *not* calling tmpnam()";
-	FILE *f = fopen(path, "w+");
+	FILE *f = NULL;
+
+	SIGNAL_SAFE(0);
+
+	f = fopen(path, "w+");
 	if (f) {
 		/* FIXME: set flag for temporary in FILE struct */
 	} else {
@@ -32,6 +36,3 @@ or when the program exits.
 IMPLEMENTATION(Whether the temporary file is removed if the program terminates abnormally)
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/tmpfile_s.c b/src/stdio/tmpfile_s.c
index 84bff0c8..e0562cfd 100644
--- a/src/stdio/tmpfile_s.c
+++ b/src/stdio/tmpfile_s.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /* open a temporary file stream */
 errno_t tmpfile_s(FILE * restrict * restrict streamptr)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
+	(void)streamptr;
 	return 0;
 }
 
@@ -26,6 +26,3 @@ be automatically removed when closed by fn(fclose) or when the program exits.
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/tmpnam.c b/src/stdio/tmpnam.c
index b4ac6b8e..af4f2012 100644
--- a/src/stdio/tmpnam.c
+++ b/src/stdio/tmpnam.c
@@ -1,6 +1,5 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** generate a temporary file name **/
 
@@ -9,6 +8,7 @@ char * tmpnam(char *s)
 	static int ntimescalled = 0;
 	static char path[L_tmpnam];
 
+	SIGNAL_SAFE(0);
 	if (ntimescalled >= TMP_MAX) {
 		return NULL;
 	}
@@ -42,6 +42,3 @@ this array.
 IMPLEMENTATION(Behavior if THIS() is called more than CONSTANT(TMP_MAX) times)
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/tmpnam_s.c b/src/stdio/tmpnam_s.c
index 3f5462a0..ada58a78 100644
--- a/src/stdio/tmpnam_s.c
+++ b/src/stdio/tmpnam_s.c
@@ -1,11 +1,12 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** generate a temporary file name **/
 errno_t tmpnam_s(char *s, rsize_t maxsize)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
+	(void)maxsize;
+
 	static int ntimescalled = 0;
 	static char path[L_tmpnam];
 
@@ -43,6 +44,3 @@ macro(L_tmpnam) characters. The temporary name will be copied to this array.
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/ungetc.c b/src/stdio/ungetc.c
index a3fc7d0a..ca579290 100644
--- a/src/stdio/ungetc.c
+++ b/src/stdio/ungetc.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
@@ -7,6 +5,7 @@
 
 int ungetc(int c, FILE *stream)
 {
+	SIGNAL_SAFE(0);
 	(void)c; (void)stream;
 	/* TODO */
 	/*
@@ -39,6 +38,3 @@ is obsolete in ISO/IEC 9899:1999.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c
index 9eea0bed..0e3f9557 100644
--- a/src/stdio/vfprintf.c
+++ b/src/stdio/vfprintf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdarg.h>
 #include <stdio.h>
 #include "_stdio.h"
@@ -10,6 +8,7 @@ int vfprintf(FILE * restrict stream, const char * restrict format, va_list arg)
 {
 	int ret = 0;
 	struct io_options opt = {0};
+	SIGNAL_SAFE(0);
 	opt.fnname = "vfprintf";
 	opt.stream = stream;
 	ret = __printf(&opt, format, arg);
@@ -31,6 +30,3 @@ responsible for this.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/vfprintf_s.c b/src/stdio/vfprintf_s.c
index 9de51739..941b03c0 100644
--- a/src/stdio/vfprintf_s.c
+++ b/src/stdio/vfprintf_s.c
@@ -1,12 +1,11 @@
-#if 0
-
 #include <stdio.h>
-#include "__stdio.h"
 #include <stdarg.h>
+#include "_stdio.h"
 
 /** write formatted output to a file stream **/
 int vfprintf_s(FILE * restrict stream, const char * restrict format, va_list arg)
 {
+	SIGNAL_SAFE(0);
 	struct io_options opt = {
 		.fnname = __func__,
 		.stream = stream,
@@ -33,6 +32,3 @@ responsible for this.
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/vfscanf.c b/src/stdio/vfscanf.c
index 271ac15f..0df43d92 100644
--- a/src/stdio/vfscanf.c
+++ b/src/stdio/vfscanf.c
@@ -1,10 +1,9 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
 int vfscanf(FILE * restrict stream, const char * restrict format, va_list arg)
 {
+	SIGNAL_SAFE(0);
 	struct io_options opt = {
 		.fnname = __func__,
 		.stream = stream,
@@ -16,6 +15,3 @@ int vfscanf(FILE * restrict stream, const char * restrict format, va_list arg)
 /*
 STDC(199901)
 */
-
-
-#endif
diff --git a/src/stdio/vfscanf_s.c b/src/stdio/vfscanf_s.c
index 7e8008a2..ca7b84d1 100644
--- a/src/stdio/vfscanf_s.c
+++ b/src/stdio/vfscanf_s.c
@@ -1,15 +1,13 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 int vfscanf_s(FILE * restrict stream, const char * restrict format, va_list arg)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
+	(void)stream; (void)format; (void)arg;
+	return 0;
 }
 
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/vprintf.c b/src/stdio/vprintf.c
index 9c8bea83..00c21419 100644
--- a/src/stdio/vprintf.c
+++ b/src/stdio/vprintf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
 #include "_stdio.h"
@@ -9,6 +7,9 @@ int vprintf(const char * restrict format, va_list arg)
 {
 	int ret = 0;
 	struct io_options opt = {0};
+
+	SIGNAL_SAFE(0);
+
 	opt.fnname = "vfprintf";
 	opt.stream = stdout;
 	ret = __printf(&opt, format, arg);
@@ -29,6 +30,3 @@ responsible for this.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/vprintf_s.c b/src/stdio/vprintf_s.c
index 4d905bbc..5f462e7e 100644
--- a/src/stdio/vprintf_s.c
+++ b/src/stdio/vprintf_s.c
@@ -1,11 +1,10 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 /** write formatted output **/
 int vprintf_s(const char * restrict format, va_list arg)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
 	return vfprintf(stdout, format, arg);
 }
 
@@ -28,6 +27,3 @@ responsible for this.
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/vscanf.c b/src/stdio/vscanf.c
index 990a8584..701ac478 100644
--- a/src/stdio/vscanf.c
+++ b/src/stdio/vscanf.c
@@ -1,15 +1,12 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 int vscanf(const char * restrict format, va_list arg)
 {
+	SIGNAL_SAFE(0);
 	return vfscanf(stdin, format, arg);
 }
 
 /*
 STDC(199901)
 */
-
-
-#endif
diff --git a/src/stdio/vscanf_s.c b/src/stdio/vscanf_s.c
index 02b2941a..d8bf0418 100644
--- a/src/stdio/vscanf_s.c
+++ b/src/stdio/vscanf_s.c
@@ -1,16 +1,12 @@
-#if 0
-
 #include <stdio.h>
+#include "_stdio.h"
 
 int vscanf_s(const char * restrict format, va_list arg)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
 	return vfscanf(stdin, format, arg);
 }
 
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/vsnprintf.c b/src/stdio/vsnprintf.c
index 14636805..3fa18cf4 100644
--- a/src/stdio/vsnprintf.c
+++ b/src/stdio/vsnprintf.c
@@ -1,11 +1,10 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
 #include "_stdio.h"
 
 int vsnprintf(char * restrict s, size_t n, const char *format, va_list arg)
 {
+	SIGNAL_SAFE(0);
 	struct io_options opt = {
 		.fnname = __func__,
 		.string = s,
@@ -18,6 +17,3 @@ int vsnprintf(char * restrict s, size_t n, const char *format, va_list arg)
 /*
 STDC(199901)
 */
-
-
-#endif
diff --git a/src/stdio/vsnprintf_s.c b/src/stdio/vsnprintf_s.c
index f1dbdbd1..3d094fe5 100644
--- a/src/stdio/vsnprintf_s.c
+++ b/src/stdio/vsnprintf_s.c
@@ -1,21 +1,17 @@
-#if 0
-
 #include <stdio.h>
 #include "_stdio.h"
 
 int vsnprintf_s(char * restrict s, rsize_t n, const char * restrict format, va_list arg)
 {
+	SIGNAL_SAFE(0);
 	struct io_options opt = {
 		.fnname = __func__,
 		.string = s,
 		.maxlen = n,
 	};
-	return __printf(&opt, format, ap);
+	return __printf(&opt, format, arg);
 }
 
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/vsprintf.c b/src/stdio/vsprintf.c
index 1954158a..ef4d40a0 100644
--- a/src/stdio/vsprintf.c
+++ b/src/stdio/vsprintf.c
@@ -1,5 +1,3 @@
-#if 0
-
 #include <stdarg.h>
 #include <stdio.h>
 #include "_stdio.h"
@@ -10,6 +8,9 @@ int vsprintf(char *s, const char *format, va_list arg)
 {
 	int ret = 0;
 	struct io_options opt = {0};
+
+	SIGNAL_SAFE(0);
+
 	opt.fnname = "fprintf";
 	opt.string = s;
 	opt.maxlen = (size_t)-1;
@@ -31,6 +32,3 @@ responsible for this.
 /*
 STDC(1)
 */
-
-
-#endif
diff --git a/src/stdio/vsprintf_s.c b/src/stdio/vsprintf_s.c
index 002e5366..02a0899f 100644
--- a/src/stdio/vsprintf_s.c
+++ b/src/stdio/vsprintf_s.c
@@ -1,13 +1,13 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
 #include <stdint.h>
+#include "_stdio.h"
 
 /** write formatted output to a string **/
 int vsprintf_s(char *s, rsize_t n, const char *format, va_list arg)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
+	(void)n;
 	return vsnprintf(s, SIZE_MAX, format, arg);
 }
 
@@ -29,6 +29,3 @@ responsible for this.
 /*
 CEXT1(201112)
 */
-
-
-#endif
diff --git a/src/stdio/vsscanf.c b/src/stdio/vsscanf.c
index ffda877b..b803e262 100644
--- a/src/stdio/vsscanf.c
+++ b/src/stdio/vsscanf.c
@@ -1,11 +1,11 @@
-#if 0
-
 #include <stdio.h>
 #include <stdarg.h>
 #include "_stdio.h"
 
 int vsscanf(const char * restrict s, const char * restrict format, va_list arg)
 {
+	SIGNAL_SAFE(0);
+
 	struct io_options opt = {
 		.fnname = __func__,
 		.string = (char*)s,
@@ -17,6 +17,3 @@ int vsscanf(const char * restrict s, const char * restrict format, va_list arg)
 /*
 STDC(199901)
 */
-
-
-#endif
diff --git a/src/stdio/vsscanf_s.c b/src/stdio/vsscanf_s.c
index 1e94ef1b..3e3ea62f 100644
--- a/src/stdio/vsscanf_s.c
+++ b/src/stdio/vsscanf_s.c
@@ -1,15 +1,13 @@
-#if 0
-
 #include <stdarg.h>
+#include "_stdio.h"
 
 int vsscanf_s(const char * restrict s, const char * restrict format, va_list arg)
 {
-	__C_EXT(1, 201112L);
+	SIGNAL_SAFE(0);
+	(void)s; (void)format; (void)arg;
+	return 0;
 }
 
 /*
 CEXT1(201112)
 */
-
-
-#endif