use restrict everywhere it's required by c99 and/or posix 2008

to deal with the fact that the public headers may be used with pre-c99
compilers, __restrict is used in place of restrict, and defined
appropriately for any supported compiler. we also avoid the form
[restrict] since older versions of gcc rejected it due to a bug in the
original c99 standard, and instead use the form *restrict.

src/stdio/dprintf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int dprintf(int fd, const char *fmt, ...)
+int dprintf(int fd, const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/fgetpos.c

@@ -1,6 +1,6 @@
 #include "stdio_impl.h"
 
-int fgetpos(FILE *f, fpos_t *pos)
+int fgetpos(FILE *restrict f, fpos_t *restrict pos)
 {
 	off_t off = __ftello(f);
 	if (off < 0) return -1;

src/stdio/fgets.c

@@ -2,7 +2,7 @@
 
 #define MIN(a,b) ((a)<(b) ? (a) : (b))
 
-char *fgets(char *s, int n, FILE *f)
+char *fgets(char *restrict s, int n, FILE *restrict f)
 {
 	char *p = s;
 	unsigned char *z;

src/stdio/fgetws.c

@@ -2,7 +2,7 @@
 
 wint_t __fgetwc_unlocked(FILE *);
 
-wchar_t *fgetws(wchar_t *s, int n, FILE *f)
+wchar_t *fgetws(wchar_t *restrict s, int n, FILE *restrict f)
 {
 	wchar_t *p = s;
 

src/stdio/fmemopen.c

@@ -67,7 +67,7 @@ static int mclose(FILE *m)
 	return 0;
 }
 
-FILE *fmemopen(void *buf, size_t size, const char *mode)
+FILE *fmemopen(void *restrict buf, size_t size, const char *restrict mode)
 {
 	FILE *f;
 	struct cookie *c;

src/stdio/fopen.c

@@ -1,6 +1,6 @@
 #include "stdio_impl.h"
 
-FILE *fopen(const char *filename, const char *mode)
+FILE *fopen(const char *restrict filename, const char *restrict mode)
 {
 	FILE *f;
 	int fd;

src/stdio/fprintf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int fprintf(FILE *f, const char *fmt, ...)
+int fprintf(FILE *restrict f, const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/fputs.c

@@ -1,6 +1,6 @@
 #include "stdio_impl.h"
 
-int fputs(const char *s, FILE *f)
+int fputs(const char *restrict s, FILE *restrict f)
 {
 	size_t l = strlen(s);
 	if (!l) return 0;

src/stdio/fputws.c

@@ -1,6 +1,6 @@
 #include "stdio_impl.h"
 
-int fputws(const wchar_t *ws, FILE *f)
+int fputws(const wchar_t *restrict ws, FILE *restrict f)
 {
 	unsigned char buf[BUFSIZ];
 	size_t l=0;

src/stdio/fread.c

@@ -2,7 +2,7 @@
 
 #define MIN(a,b) ((a)<(b) ? (a) : (b))
 
-size_t fread(void *destv, size_t size, size_t nmemb, FILE *f)
+size_t fread(void *restrict destv, size_t size, size_t nmemb, FILE *restrict f)
 {
 	unsigned char *dest = destv;
 	size_t len = size*nmemb, l = len, k;

src/stdio/freopen.c

@@ -7,7 +7,7 @@
 /* Locking is not necessary because, in the event of failure, the stream
  * passed to freopen is invalid as soon as freopen is called. */
 
-FILE *freopen(const char *filename, const char *mode, FILE *f)
+FILE *freopen(const char *restrict filename, const char *restrict mode, FILE *restrict f)
 {
 	int fl;
 	FILE *f2;

src/stdio/fscanf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int fscanf(FILE *f, const char *fmt, ...)
+int fscanf(FILE *restrict f, const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/fwprintf.c

@@ -2,7 +2,7 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int fwprintf(FILE *f, const wchar_t *fmt, ...)
+int fwprintf(FILE *restrict f, const wchar_t *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/fwrite.c

@@ -1,6 +1,6 @@
 #include "stdio_impl.h"
 
-size_t __fwritex(const unsigned char *s, size_t l, FILE *f)
+size_t __fwritex(const unsigned char *restrict s, size_t l, FILE *restrict f)
 {
 	size_t i=0;
 
@@ -24,7 +24,7 @@ size_t __fwritex(const unsigned char *s, size_t l, FILE *f)
 	return l+i;
 }
 
-size_t fwrite(const void *src, size_t size, size_t nmemb, FILE *f)
+size_t fwrite(const void *restrict src, size_t size, size_t nmemb, FILE *restrict f)
 {
 	size_t k, l = size*nmemb;
 	if (!l) return l;

src/stdio/fwscanf.c

@@ -2,7 +2,7 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int fwscanf(FILE *f, const wchar_t *fmt, ...)
+int fwscanf(FILE *restrict f, const wchar_t *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/getdelim.c

@@ -2,7 +2,7 @@
 
 #define MIN(a,b) ((a)<(b) ? (a) : (b))
 
-ssize_t getdelim(char **s, size_t *n, int delim, FILE *f)
+ssize_t getdelim(char **restrict s, size_t *restrict n, int delim, FILE *restrict f)
 {
 	char *tmp;
 	unsigned char *z;

src/stdio/getline.c

@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-ssize_t getline(char **s, size_t *n, FILE *f)
+ssize_t getline(char **restrict s, size_t *restrict n, FILE *restrict f)
 {
 	return getdelim(s, n, '\n', f);
 }

src/stdio/printf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int printf(const char *fmt, ...)
+int printf(const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/scanf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int scanf(const char *fmt, ...)
+int scanf(const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/setbuf.c

@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-void setbuf(FILE *f, char *buf)
+void setbuf(FILE *restrict f, char *restrict buf)
 {
 	setvbuf(f, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
 }

src/stdio/setvbuf.c

@@ -9,7 +9,7 @@
  * In the case of stderr where the preexisting buffer is length 1, it
  * is not possible to set line buffering or full buffering. */
 
-int setvbuf(FILE *f, char *buf, int type, size_t size)
+int setvbuf(FILE *restrict f, char *restrict buf, int type, size_t size)
 {
 	f->lbf = EOF;
 

src/stdio/snprintf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int snprintf(char *s, size_t n, const char *fmt, ...)
+int snprintf(char *restrict s, size_t n, const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/sprintf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int sprintf(char *s, const char *fmt, ...)
+int sprintf(char *restrict s, const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/sscanf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int sscanf(const char *s, const char *fmt, ...)
+int sscanf(const char *restrict s, const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/swprintf.c

@@ -2,7 +2,7 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int swprintf(wchar_t *s, size_t n, const wchar_t *fmt, ...)
+int swprintf(wchar_t *restrict s, size_t n, const wchar_t *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/swscanf.c

@@ -2,7 +2,7 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int swscanf(const wchar_t *s, const wchar_t *fmt, ...)
+int swscanf(const wchar_t *restrict s, const wchar_t *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/vdprintf.c

@@ -5,7 +5,7 @@ static size_t wrap_write(FILE *f, const unsigned char *buf, size_t len)
 	return __stdio_write(f, buf, len);
 }
 
-int vdprintf(int fd, const char *fmt, va_list ap)
+int vdprintf(int fd, const char *restrict fmt, va_list ap)
 {
 	FILE f = {
 		.fd = fd, .lbf = EOF, .write = wrap_write,

src/stdio/vfprintf.c

@@ -636,7 +636,7 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
 	return 1;
 }
 
-int vfprintf(FILE *f, const char *fmt, va_list ap)
+int vfprintf(FILE *restrict f, const char *restrict fmt, va_list ap)
 {
 	va_list ap2;
 	int nl_type[NL_ARGMAX+1] = {0};

src/stdio/vfscanf.c

@@ -71,7 +71,7 @@ static int readwc(int c, wchar_t **wcs, mbstate_t *st)
 	return 0;
 }
 
-int vfscanf(FILE *f, const char *fmt, va_list ap)
+int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
 {
 	int width;
 	int size;

src/stdio/vfwprintf.c

@@ -336,7 +336,7 @@ static int wprintf_core(FILE *f, const wchar_t *fmt, va_list *ap, union arg *nl_
 	return 1;
 }
 
-int vfwprintf(FILE *f, const wchar_t *fmt, va_list ap)
+int vfwprintf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
 {
 	va_list ap2;
 	int nl_type[NL_ARGMAX] = {0};

src/stdio/vfwscanf.c

@@ -86,7 +86,7 @@ static int in_set(const wchar_t *set, int c)
 	((f)->rend && (c)<128U ? *--(f)->rpos : ungetwc((c),(f)))
 #endif
 
-int vfwscanf(FILE *f, const wchar_t *fmt, va_list ap)
+int vfwscanf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
 {
 	int width;
 	int size;

src/stdio/vprintf.c

@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-int vprintf(const char *fmt, va_list ap)
+int vprintf(const char *restrict fmt, va_list ap)
 {
 	return vfprintf(stdout, fmt, ap);
 }

src/stdio/vscanf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int vscanf(const char *fmt, va_list ap)
+int vscanf(const char *restrict fmt, va_list ap)
 {
 	return vfscanf(stdin, fmt, ap);
 }

src/stdio/vsnprintf.c

@@ -10,7 +10,7 @@ static size_t sn_write(FILE *f, const unsigned char *s, size_t l)
 	return l;
 }
 
-int vsnprintf(char *s, size_t n, const char *fmt, va_list ap)
+int vsnprintf(char *restrict s, size_t n, const char *restrict fmt, va_list ap)
 {
 	int r;
 	char b;

src/stdio/vsprintf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <limits.h>
 
-int vsprintf(char *s, const char *fmt, va_list ap)
+int vsprintf(char *restrict s, const char *restrict fmt, va_list ap)
 {
 	return vsnprintf(s, INT_MAX, fmt, ap);
 }

src/stdio/vsscanf.c

@@ -5,7 +5,7 @@ static size_t do_read(FILE *f, unsigned char *buf, size_t len)
 	return __string_read(f, buf, len);
 }
 
-int vsscanf(const char *s, const char *fmt, va_list ap)
+int vsscanf(const char *restrict s, const char *restrict fmt, va_list ap)
 {
 	FILE f = {
 		.buf = (void *)s, .cookie = (void *)s,

src/stdio/vswprintf.c

@@ -22,7 +22,7 @@ static size_t sw_write(FILE *f, const unsigned char *s, size_t l)
 	return i<0 ? i : l0;
 }
 
-int vswprintf(wchar_t *s, size_t n, const wchar_t *fmt, va_list ap)
+int vswprintf(wchar_t *restrict s, size_t n, const wchar_t *restrict fmt, va_list ap)
 {
 	int r;
 	FILE f;

src/stdio/vswscanf.c

@@ -23,7 +23,7 @@ static size_t wstring_read(FILE *f, unsigned char *buf, size_t len)
 	return 1;
 }
 
-int vswscanf(const wchar_t *s, const wchar_t *fmt, va_list ap)
+int vswscanf(const wchar_t *restrict s, const wchar_t *restrict fmt, va_list ap)
 {
 	unsigned char buf[256];
 	FILE f = {

src/stdio/vwprintf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <wchar.h>
 
-int vwprintf(const wchar_t *fmt, va_list ap)
+int vwprintf(const wchar_t *restrict fmt, va_list ap)
 {
 	return vfwprintf(stdout, fmt, ap);
 }

src/stdio/vwscanf.c

@@ -2,7 +2,7 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int vwscanf(const wchar_t *fmt, va_list ap)
+int vwscanf(const wchar_t *restrict fmt, va_list ap)
 {
 	return vfwscanf(stdin, fmt, ap);
 }

src/stdio/wprintf.c

@@ -2,7 +2,7 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int wprintf(const wchar_t *fmt, ...)
+int wprintf(const wchar_t *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/wscanf.c

@@ -2,7 +2,7 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int wscanf(const wchar_t *fmt, ...)
+int wscanf(const wchar_t *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;