Use ssize_t for substdio op and read/write wrappers.

Bug: https://bugs.gentoo.org/944901

--- a/condredirect.c
+++ b/condredirect.c
@@ -15,7 +15,7 @@
 
 struct qmail qqt;
 
-int mywrite(fd,buf,len) int fd; char *buf; int len;
+ssize_t mywrite(fd,buf,len) int fd; char *buf; int len;
 {
   qmail_put(&qqt,buf,len);
   return len;
--- a/forward.c
+++ b/forward.c
@@ -13,7 +13,7 @@
 
 struct qmail qqt;
 
-int mywrite(fd,buf,len) int fd; char *buf; int len;
+ssize_t mywrite(fd,buf,len) int fd; char *buf; int len;
 {
   qmail_put(&qqt,buf,len);
   return len;
--- a/qmail-pop3d.c
+++ b/qmail-pop3d.c
@@ -20,7 +20,7 @@
 
 void die() { _exit(0); }
 
-int saferead(fd,buf,len) int fd; char *buf; int len;
+ssize_t saferead(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   r = timeoutread(1200,fd,buf,len);
@@ -28,7 +28,7 @@
   return r;
 }
 
-int safewrite(fd,buf,len) int fd; char *buf; int len;
+ssize_t safewrite(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   r = timeoutwrite(1200,fd,buf,len);
--- a/qmail-popup.c
+++ b/qmail-popup.c
@@ -16,7 +16,7 @@
 
 void die() { _exit(1); }
 
-int saferead(fd,buf,len) int fd; char *buf; int len;
+ssize_t saferead(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   r = timeoutread(1200,fd,buf,len);
@@ -24,7 +24,7 @@
   return r;
 }
 
-int safewrite(fd,buf,len) int fd; char *buf; int len;
+ssize_t safewrite(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   r = timeoutwrite(1200,fd,buf,len);
--- a/qmail-qmqpc.c
+++ b/qmail-qmqpc.c
@@ -34,14 +34,14 @@
 int lasterror = 55;
 int qmqpfd;
 
-int saferead(fd,buf,len) int fd; char *buf; int len;
+ssize_t saferead(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   r = timeoutread(60,qmqpfd,buf,len);
   if (r <= 0) die_conn();
   return r;
 }
-int safewrite(fd,buf,len) int fd; char *buf; int len;
+ssize_t safewrite(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   r = timeoutwrite(60,qmqpfd,buf,len);
--- a/qmail-qmqpd.c
+++ b/qmail-qmqpd.c
@@ -11,14 +11,14 @@
 
 void resources() { _exit(111); }
 
-int safewrite(fd,buf,len) int fd; char *buf; int len;
+ssize_t safewrite(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   r = write(fd,buf,len);
   if (r <= 0) _exit(0);
   return r;
 }
-int saferead(fd,buf,len) int fd; char *buf; int len;
+ssize_t saferead(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   r = read(fd,buf,len);
--- a/qmail-qmtpd.c
+++ b/qmail-qmtpd.c
@@ -16,7 +16,7 @@
 void badproto() { _exit(100); }
 void resources() { _exit(111); }
 
-int safewrite(fd,buf,len) int fd; char *buf; int len;
+ssize_t safewrite(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   r = write(fd,buf,len);
@@ -27,7 +27,7 @@
 char ssoutbuf[256];
 substdio ssout = SUBSTDIO_FDBUF(safewrite,1,ssoutbuf,sizeof ssoutbuf);
 
-int saferead(fd,buf,len) int fd; char *buf; int len;
+ssize_t saferead(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   substdio_flush(&ssout);
--- a/qmail-remote.c
+++ b/qmail-remote.c
@@ -124,7 +124,7 @@
 int smtpfd;
 int timeout = 1200;
 
-int saferead(fd,buf,len) int fd; char *buf; int len;
+ssize_t saferead(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
 #ifdef TLS
@@ -137,7 +137,7 @@
   if (r <= 0) dropped();
   return r;
 }
-int safewrite(fd,buf,len) int fd; char *buf; int len;
+ssize_t safewrite(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
 #ifdef TLS
--- a/qmail-smtpd.c
+++ b/qmail-smtpd.c
@@ -43,7 +43,7 @@
 int ssl_rfd = -1, ssl_wfd = -1; /* SSL_get_Xfd() are broken */
 #endif
 
-int safewrite(fd,buf,len) int fd; char *buf; int len;
+ssize_t safewrite(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
 #ifdef TLS
@@ -398,7 +398,7 @@
 }
 
 
-int saferead(fd,buf,len) int fd; char *buf; int len;
+ssize_t saferead(fd,buf,len) int fd; char *buf; int len;
 {
   int r;
   flush();
--- a/subfd.h
+++ b/subfd.h
@@ -9,7 +9,7 @@
 extern substdio *subfdoutsmall;
 extern substdio *subfderr;
 
-extern int subfd_read();
-extern int subfd_readsmall();
+extern ssize_t subfd_read();
+extern ssize_t subfd_readsmall();
 
 #endif
--- a/subfdin.c
+++ b/subfdin.c
@@ -2,7 +2,7 @@
 #include "substdio.h"
 #include "subfd.h"
 
-int subfd_read(fd,buf,len) int fd; char *buf; int len;
+ssize_t subfd_read(fd,buf,len) int fd; char *buf; int len;
 {
   if (substdio_flush(subfdout) == -1) return -1;
   return read(fd,buf,len);
--- a/subfdins.c
+++ b/subfdins.c
@@ -2,7 +2,7 @@
 #include "substdio.h"
 #include "subfd.h"
 
-int subfd_readsmall(fd,buf,len) int fd; char *buf; int len;
+ssize_t subfd_readsmall(fd,buf,len) int fd; char *buf; int len;
 {
   if (substdio_flush(subfdoutsmall) == -1) return -1;
   return read(fd,buf,len);
--- a/substdi.c
+++ b/substdi.c
@@ -3,7 +3,7 @@
 #include "error.h"
 
 static int oneread(op,fd,buf,len)
-register int (*op)();
+register ssize_t (*op)();
 register int fd;
 register char *buf;
 register int len;
--- a/substdio.c
+++ b/substdio.c
@@ -2,7 +2,7 @@
 
 void substdio_fdbuf(s,op,fd,buf,len)
 register substdio *s;
-register int (*op)();
+register ssize_t (*op)();
 register int fd;
 register char *buf;
 register int len;
--- a/substdio.h
+++ b/substdio.h
@@ -1,3 +1,4 @@
+#include <sys/types.h>
 #ifndef SUBSTDIO_H
 #define SUBSTDIO_H
 
@@ -6,7 +7,7 @@
   int p;
   int n;
   int fd;
-  int (*op)();
+  ssize_t (*op)();
 } substdio;
 
 #define SUBSTDIO_FDBUF(op,fd,buf,len) { (buf), 0, (len), (fd), (op) }
--- a/substdo.c
+++ b/substdo.c
@@ -4,7 +4,7 @@
 #include "error.h"
 
 static int allwrite(op,fd,buf,len)
-register int (*op)();
+register ssize_t (*op)();
 register int fd;
 register char *buf;
 register unsigned int len;