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/network/accept.c

@@ -2,7 +2,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-int accept(int fd, struct sockaddr *addr, socklen_t *len)
+int accept(int fd, struct sockaddr *restrict addr, socklen_t *restrict len)
 {
 	return socketcall_cp(accept, fd, addr, len, 0, 0, 0);
 }

src/network/getaddrinfo.c

@@ -47,7 +47,7 @@ struct aibuf {
 /* Extra slots needed for storing canonical name */
 #define EXTRA ((256+sizeof(struct aibuf)-1)/sizeof(struct aibuf))
 
-int getaddrinfo(const char *host, const char *serv, const struct addrinfo *hint, struct addrinfo **res)
+int getaddrinfo(const char *restrict host, const char *restrict serv, const struct addrinfo *restrict hint, struct addrinfo **restrict res)
 {
 	int flags = hint ? hint->ai_flags : 0;
 	int family = hint ? hint->ai_family : AF_UNSPEC;

src/network/getnameinfo.c

@@ -8,9 +8,9 @@
 #include <arpa/inet.h>
 #include "__dns.h"
 
-int getnameinfo(const struct sockaddr *sa, socklen_t sl,
-	char *node, socklen_t nodelen,
-	char *serv, socklen_t servlen,
+int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl,
+	char *restrict node, socklen_t nodelen,
+	char *restrict serv, socklen_t servlen,
 	int flags)
 {
 	char buf[256];

src/network/getpeername.c

@@ -1,7 +1,7 @@
 #include <sys/socket.h>
 #include "syscall.h"
 
-int getpeername(int fd, struct sockaddr *addr, socklen_t *len)
+int getpeername(int fd, struct sockaddr *restrict addr, socklen_t *restrict len)
 {
 	return socketcall(getpeername, fd, addr, len, 0, 0, 0);
 }

src/network/getsockname.c

@@ -1,7 +1,7 @@
 #include <sys/socket.h>
 #include "syscall.h"
 
-int getsockname(int fd, struct sockaddr *addr, socklen_t *len)
+int getsockname(int fd, struct sockaddr *restrict addr, socklen_t *restrict len)
 {
 	return socketcall(getsockname, fd, addr, len, 0, 0, 0);
 }

src/network/getsockopt.c

@@ -1,7 +1,7 @@
 #include <sys/socket.h>
 #include "syscall.h"
 
-int getsockopt(int fd, int level, int optname, void *optval, socklen_t *optlen)
+int getsockopt(int fd, int level, int optname, void *restrict optval, socklen_t *restrict optlen)
 {
 	return socketcall(getsockopt, fd, level, optname, optval, optlen, 0);
 }

src/network/inet_ntop.c

@@ -6,7 +6,7 @@
 #include <stdio.h>
 #include <string.h>
 
-const char *inet_ntop(int af, const void *a0, char *s, socklen_t l)
+const char *inet_ntop(int af, const void *restrict a0, char *restrict s, socklen_t l)
 {
 	const unsigned char *a = a0;
 	int i, j, max, best;

src/network/inet_pton.c

@@ -14,7 +14,7 @@ static int hexval(unsigned c)
 	return -1;
 }
 
-int inet_pton(int af, const char *s, void *a0)
+int inet_pton(int af, const char *restrict s, void *restrict a0)
 {
 	uint16_t ip[8];
 	unsigned char *a = a0;

src/network/recvfrom.c

@@ -2,7 +2,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-ssize_t recvfrom(int fd, void *buf, size_t len, int flags, struct sockaddr *addr, socklen_t *alen)
+ssize_t recvfrom(int fd, void *restrict buf, size_t len, int flags, struct sockaddr *restrict addr, socklen_t *restrict alen)
 {
 	return socketcall_cp(recvfrom, fd, buf, len, flags, addr, alen);
 }