lib9: avoid all -Wconversion warnings

Built after adding -Wconversion to the list of compiler
arguments used when building.  I believe these are all OK
assuming we will not change the API.  There is no effort to
detect overflow due to very long strings.

R=golang-dev, dave, rsc, r
CC=golang-dev
https://codereview.appspot.com/10195044

33 files changed, 165 insertions, 161 deletions

diff --git a/src/lib9/_p9dir.c b/src/lib9/_p9dir.c
index 58c0822a4..a226556f5 100644
--- a/src/lib9/_p9dir.c
+++ b/src/lib9/_p9dir.c
@@ -68,12 +68,12 @@ _p9dir(struct stat *lst, struct stat *st, char *name, Dir *d, char **str, char *
 			*str += strlen(*str)+1;
 		}
 	}
-	sz += strlen(s)+1;
+	sz += (int)strlen(s)+1;
 
 	/* user */
 	snprint(tmp, sizeof tmp, "%d", (int)st->st_uid);
 	s = tmp;
-	sz += strlen(s)+1;
+	sz += (int)strlen(s)+1;
 	if(d){
 		if(*str+strlen(s)+1 > estr)
 			d->uid = "oops";
@@ -87,7 +87,7 @@ _p9dir(struct stat *lst, struct stat *st, char *name, Dir *d, char **str, char *
 	/* group */
 	snprint(tmp, sizeof tmp, "%d", (int)st->st_gid);
 	s = tmp;
-	sz += strlen(s)+1;
+	sz += (int)strlen(s)+1;
 	if(d){
 		if(*str + strlen(s)+1 > estr)
 			d->gid = "oops";
@@ -107,10 +107,10 @@ _p9dir(struct stat *lst, struct stat *st, char *name, Dir *d, char **str, char *
 		d->qid.vers = st->st_gen;
 #endif
 		if(d->qid.vers == 0)
-			d->qid.vers = st->st_mtime + st->st_ctime;
+			d->qid.vers = (ulong)(st->st_mtime + st->st_ctime);
 		d->mode = st->st_mode&0777;
-		d->atime = st->st_atime;
-		d->mtime = st->st_mtime;
+		d->atime = (ulong)st->st_atime;
+		d->mtime = (ulong)st->st_mtime;
 		d->length = st->st_size;
 
 		if(S_ISDIR(st->st_mode)){
diff --git a/src/lib9/atoi.c b/src/lib9/atoi.c
index 37a178280..3162b0117 100644
--- a/src/lib9/atoi.c
+++ b/src/lib9/atoi.c
@@ -29,7 +29,7 @@ THE SOFTWARE.
 int
 atoi(char *s)
 {
-	return strtol(s, 0, 0);
+	return (int)strtol(s, 0, 0);
 }
 
 long
diff --git a/src/lib9/await.c b/src/lib9/await.c
index 0f00a94bd..690a61e5c 100644
--- a/src/lib9/await.c
+++ b/src/lib9/await.c
@@ -134,8 +134,8 @@ _wait(int pid4, int opt)
 			free(w);
 			return nil;
 		}
-		u = ru.ru_utime.tv_sec*1000+((ru.ru_utime.tv_usec+500)/1000);
-		s = ru.ru_stime.tv_sec*1000+((ru.ru_stime.tv_usec+500)/1000);
+		u = (ulong)(ru.ru_utime.tv_sec*1000+((ru.ru_utime.tv_usec+500)/1000));
+		s = (ulong)(ru.ru_stime.tv_sec*1000+((ru.ru_stime.tv_usec+500)/1000));
 		w->pid = pid;
 		w->time[0] = u;
 		w->time[1] = s;
diff --git a/src/lib9/dirfstat.c b/src/lib9/dirfstat.c
index 17fe10aee..8cc338409 100644
--- a/src/lib9/dirfstat.c
+++ b/src/lib9/dirfstat.c
@@ -43,10 +43,10 @@ dirfstat(int fd)
 
 	snprint(tmp, sizeof tmp, "/dev/fd/%d", fd);
 	nstr = _p9dir(&st, &st, tmp, nil, nil, nil);
-	d = malloc(sizeof(Dir)+nstr);
+	d = malloc(sizeof(Dir)+(size_t)nstr);
 	if(d == nil)
 		return nil;
-	memset(d, 0, sizeof(Dir)+nstr);
+	memset(d, 0, sizeof(Dir)+(size_t)nstr);
 	str = (char*)&d[1];
 	_p9dir(&st, &st, tmp, d, &str, str+nstr);
 	return d;
diff --git a/src/lib9/dirfwstat.c b/src/lib9/dirfwstat.c
index fe9153b9b..d0afe7d71 100644
--- a/src/lib9/dirfwstat.c
+++ b/src/lib9/dirfwstat.c
@@ -63,14 +63,14 @@ dirfwstat(int fd, Dir *dir)
 	ret = 0;
 #ifndef _WIN32
 	if(~dir->mode != 0){
-		if(fchmod(fd, dir->mode) < 0)
+		if(fchmod(fd, (mode_t)dir->mode) < 0)
 			ret = -1;
 	}
 #endif
 	if(~dir->mtime != 0){
-		tv[0].tv_sec = dir->mtime;
+		tv[0].tv_sec = (time_t)dir->mtime;
 		tv[0].tv_usec = 0;
-		tv[1].tv_sec = dir->mtime;
+		tv[1].tv_sec = (time_t)dir->mtime;
 		tv[1].tv_usec = 0;
 		if(futimes(fd, tv) < 0)
 			ret = -1;
diff --git a/src/lib9/dirstat.c b/src/lib9/dirstat.c
index 6d804ca7c..df2f85bd0 100644
--- a/src/lib9/dirstat.c
+++ b/src/lib9/dirstat.c
@@ -52,10 +52,10 @@ dirstat(char *file)
 #endif
 
 	nstr = _p9dir(&lst, &st, file, nil, nil, nil);
-	d = malloc(sizeof(Dir)+nstr);
+	d = malloc(sizeof(Dir)+(size_t)nstr);
 	if(d == nil)
 		return nil;
-	memset(d, 0, sizeof(Dir)+nstr);
+	memset(d, 0, sizeof(Dir)+(size_t)nstr);
 	str = (char*)&d[1];
 	_p9dir(&lst, &st, file, d, &str, str+nstr);
 	return d;
diff --git a/src/lib9/dirwstat.c b/src/lib9/dirwstat.c
index 2646cba40..9bf348af6 100644
--- a/src/lib9/dirwstat.c
+++ b/src/lib9/dirwstat.c
@@ -37,7 +37,7 @@ dirwstat(char *file, Dir *dir)
 	if(~dir->mtime == 0)
 		return 0;
 
-	ub.actime = dir->mtime;
-	ub.modtime = dir->mtime;
+	ub.actime = (time_t)dir->mtime;
+	ub.modtime = (time_t)dir->mtime;
 	return utime(file, &ub);
 }
diff --git a/src/lib9/execl.c b/src/lib9/execl.c
index 9e42ad34b..81d315883 100644
--- a/src/lib9/execl.c
+++ b/src/lib9/execl.c
@@ -37,7 +37,7 @@ execl(char *prog, ...)
 		;
 	va_end(arg);
 
-	argv = malloc((i+1)*sizeof(char*));
+	argv = malloc((size_t)(i+1)*sizeof(char*));
 	if(argv == nil)
 		return -1;
 
diff --git a/src/lib9/flag.c b/src/lib9/flag.c
index 7c79c1a6d..db46b9809 100644
--- a/src/lib9/flag.c
+++ b/src/lib9/flag.c
@@ -54,7 +54,7 @@ lookflag(char *name, int namelen, int creat)
 
 	h = fnv(name, namelen) & (nelem(fhash)-1);
 	for(f=fhash[h]; f; f=f->next) {
-		if(f->namelen == namelen && memcmp(f->name, name, namelen) == 0) {
+		if(f->namelen == namelen && memcmp(f->name, name, (size_t)namelen) == 0) {
 			if(creat)
 				sysfatal("multiple definitions of flag -%s", name);
 			return f;
@@ -97,7 +97,7 @@ flagcount(char *name, char *desc, int *p)
 {
 	Flag *f;
 	
-	f = lookflag(name, strlen(name), 1);
+	f = lookflag(name, (int)strlen(name), 1);
 	f->desc = desc;
 	f->iscount = 1;
 	f->set = count;
@@ -119,7 +119,7 @@ flagint64(char *name, char *desc, int64 *p)
 {
 	Flag *f;
 	
-	f = lookflag(name, strlen(name), 1);
+	f = lookflag(name, (int)strlen(name), 1);
 	f->desc = desc;
 	f->set = atollwhex;
 	f->arg = p;
@@ -130,7 +130,7 @@ atolwhex(char *s, void *p)
 {
 	char *t;
 
-	*(int32*)p = strtol(s, &t, 0);
+	*(int32*)p = (int32)strtol(s, &t, 0);
 	if(*s == '\0' || *t != '\0')
 		sysfatal("invalid numeric argument -%s=%s", curflag->name, s);
 }
@@ -140,7 +140,7 @@ flagint32(char *name, char *desc, int32 *p)
 {
 	Flag *f;
 	
-	f = lookflag(name, strlen(name), 1);
+	f = lookflag(name, (int)strlen(name), 1);
 	f->desc = desc;
 	f->set = atolwhex;
 	f->arg = p;
@@ -158,7 +158,7 @@ flagstr(char *name, char *desc, char **p)
 
 	Flag *f;
 	
-	f = lookflag(name, strlen(name), 1);
+	f = lookflag(name, (int)strlen(name), 1);
 	f->desc = desc;
 	f->set = string;
 	f->arg = p;
@@ -176,7 +176,7 @@ flagfn0(char *name, char *desc, void (*fn)(void))
 {
 	Flag *f;
 	
-	f = lookflag(name, strlen(name), 1);
+	f = lookflag(name, (int)strlen(name), 1);
 	f->desc = desc;
 	f->set = fn0;
 	f->arg = fn;
@@ -194,7 +194,7 @@ flagfn1(char *name, char *desc, void (*fn)(char*))
 {
 	Flag *f;
 	
-	f = lookflag(name, strlen(name), 1);
+	f = lookflag(name, (int)strlen(name), 1);
 	f->desc = desc;
 	f->set = fn1;
 	f->arg = fn;
@@ -211,7 +211,7 @@ flagfn2(char *name, char *desc, void (*fn)(char*, char*))
 {
 	Flag *f;
 	
-	f = lookflag(name, strlen(name), 1);
+	f = lookflag(name, (int)strlen(name), 1);
 	f->desc = desc;
 	f->set2 = fn2;
 	f->arg = fn;
@@ -253,9 +253,9 @@ flagparse(int *argcp, char ***argvp, void (*usage)(void))
 		name = p+1;
 		q = strchr(name, '=');
 		if(q != nil)
-			namelen = q++ - name;
+			namelen = (int)(q++ - name);
 		else
-			namelen = strlen(name);
+			namelen = (int)strlen(name);
 		f = lookflag(name, namelen, 0);
 		if(f == nil) {
 			if(strcmp(p, "-h") == 0 || strcmp(p, "-help") == 0 || strcmp(p, "-?") == 0)
diff --git a/src/lib9/fmt/dofmt.c b/src/lib9/fmt/dofmt.c
index cc6ab9225..95f378704 100644
--- a/src/lib9/fmt/dofmt.c
+++ b/src/lib9/fmt/dofmt.c
@@ -25,7 +25,7 @@ int
 dofmt(Fmt *f, char *fmt)
 {
 	Rune rune, *rt, *rs;
-	int r;
+	Rune r;
 	char *t, *s;
 	int n, nfmt;
 
@@ -34,7 +34,7 @@ dofmt(Fmt *f, char *fmt)
 		if(f->runes){
 			rt = (Rune*)f->to;
 			rs = (Rune*)f->stop;
-			while((r = *(uchar*)fmt) && r != '%'){
+			while((r = (Rune)*(uchar*)fmt) && r != '%'){
 				if(r < Runeself)
 					fmt++;
 				else{
@@ -44,7 +44,7 @@ dofmt(Fmt *f, char *fmt)
 				FMTRCHAR(f, rt, rs, r);
 			}
 			fmt++;
-			f->nfmt += rt - (Rune *)f->to;
+			f->nfmt += (int)(rt - (Rune *)f->to);
 			f->to = rt;
 			if(!r)
 				return f->nfmt - nfmt;
@@ -52,7 +52,7 @@ dofmt(Fmt *f, char *fmt)
 		}else{
 			t = (char*)f->to;
 			s = (char*)f->stop;
-			while((r = *(uchar*)fmt) && r != '%'){
+			while((r = (Rune)*(uchar*)fmt) && r != '%'){
 				if(r < Runeself){
 					FMTCHAR(f, t, s, r);
 					fmt++;
@@ -70,7 +70,7 @@ dofmt(Fmt *f, char *fmt)
 				}
 			}
 			fmt++;
-			f->nfmt += t - (char *)f->to;
+			f->nfmt += (int)(t - (char *)f->to);
 			f->to = t;
 			if(!r)
 				return f->nfmt - nfmt;
@@ -87,9 +87,9 @@ void *
 __fmtflush(Fmt *f, void *t, int len)
 {
 	if(f->runes)
-		f->nfmt += (Rune*)t - (Rune*)f->to;
+		f->nfmt += (int)((Rune*)t - (Rune*)f->to);
 	else
-		f->nfmt += (char*)t - (char *)f->to;
+		f->nfmt += (int)((char*)t - (char *)f->to);
 	f->to = t;
 	if(f->flush == 0 || (*f->flush)(f) == 0 || (char*)f->to + len > (char*)f->stop){
 		f->stop = f->to;
@@ -112,7 +112,7 @@ __fmtpad(Fmt *f, int n)
 	s = (char*)f->stop;
 	for(i = 0; i < n; i++)
 		FMTCHAR(f, t, s, ' ');
-	f->nfmt += t - (char *)f->to;
+	f->nfmt += (int)(t - (char *)f->to);
 	f->to = t;
 	return 0;
 }
@@ -127,7 +127,7 @@ __rfmtpad(Fmt *f, int n)
 	s = (Rune*)f->stop;
 	for(i = 0; i < n; i++)
 		FMTRCHAR(f, t, s, ' ');
-	f->nfmt += t - (Rune *)f->to;
+	f->nfmt += (int)(t - (Rune *)f->to);
 	f->to = t;
 	return 0;
 }
@@ -157,13 +157,13 @@ __fmtcpy(Fmt *f, const void *vm, int n, int sz)
 			r = *(uchar*)m;
 			if(r < Runeself)
 				m++;
-			else if((me - m) >= UTFmax || fullrune(m, me-m))
+			else if((me - m) >= UTFmax || fullrune(m, (int)(me-m)))
 				m += chartorune(&r, m);
 			else
 				break;
 			FMTRCHAR(f, rt, rs, r);
 		}
-		f->nfmt += rt - (Rune *)f->to;
+		f->nfmt += (int)(rt - (Rune *)f->to);
 		f->to = rt;
 		if(fl & FmtLeft && __rfmtpad(f, w - n) < 0)
 			return -1;
@@ -176,13 +176,13 @@ __fmtcpy(Fmt *f, const void *vm, int n, int sz)
 			r = *(uchar*)m;
 			if(r < Runeself)
 				m++;
-			else if((me - m) >= UTFmax || fullrune(m, me-m))
+			else if((me - m) >= UTFmax || fullrune(m, (int)(me-m)))
 				m += chartorune(&r, m);
 			else
 				break;
 			FMTRUNE(f, t, s, r);
 		}
-		f->nfmt += t - (char *)f->to;
+		f->nfmt += (int)(t - (char *)f->to);
 		f->to = t;
 		if(fl & FmtLeft && __fmtpad(f, w - n) < 0)
 			return -1;
@@ -212,7 +212,7 @@ __fmtrcpy(Fmt *f, const void *vm, int n)
 		rs = (Rune*)f->stop;
 		for(me = m + n; m < me; m++)
 			FMTRCHAR(f, rt, rs, *m);
-		f->nfmt += rt - (Rune *)f->to;
+		f->nfmt += (int)(rt - (Rune *)f->to);
 		f->to = rt;
 		if(fl & FmtLeft && __rfmtpad(f, w - n) < 0)
 			return -1;
@@ -225,7 +225,7 @@ __fmtrcpy(Fmt *f, const void *vm, int n)
 			r = *m;
 			FMTRUNE(f, t, s, r);
 		}
-		f->nfmt += t - (char *)f->to;
+		f->nfmt += (int)(t - (char *)f->to);
 		f->to = t;
 		if(fl & FmtLeft && __fmtpad(f, w - n) < 0)
 			return -1;
@@ -239,7 +239,7 @@ __charfmt(Fmt *f)
 {
 	char x[1];
 
-	x[0] = va_arg(f->args, int);
+	x[0] = (char)va_arg(f->args, int);
 	f->prec = 1;
 	return __fmtcpy(f, (const char*)x, 1, 1);
 }
@@ -250,7 +250,7 @@ __runefmt(Fmt *f)
 {
 	Rune x[1];
 
-	x[0] = va_arg(f->args, int);
+	x[0] = (Rune)va_arg(f->args, int);
 	return __fmtrcpy(f, (const void*)x, 1);
 }
 
@@ -278,7 +278,7 @@ fmtstrcpy(Fmt *f, char *s)
 #endif
 		return __fmtcpy(f, s, j, i);
 	}
-	return __fmtcpy(f, s, utflen(s), strlen(s));
+	return __fmtcpy(f, s, utflen(s), (int)strlen(s));
 }
 
 /* fmt out a null terminated utf string */
@@ -309,7 +309,7 @@ fmtrunestrcpy(Fmt *f, Rune *s)
 	}else{
 		for(e = s; *e; e++)
 			;
-		n = e - s;
+		n = (int)(e - s);
 	}
 	return __fmtrcpy(f, s, n);
 }
@@ -342,8 +342,8 @@ __ifmt(Fmt *f)
 	char buf[140], *p, *conv;
 	/* 140: for 64 bits of binary + 3-byte sep every 4 digits */
 	uvlong vu;
-	ulong u;
-	int neg, base, i, n, fl, w, isv;
+	ulong fl, u;
+	int neg, base, i, n, w, isv;
 	int ndig, len, excess, bytelen;
 	char *grouping;
 	char *thousands;
@@ -377,27 +377,27 @@ __ifmt(Fmt *f)
 		if(fl & FmtUnsigned)
 			vu = va_arg(f->args, uvlong);
 		else
-			vu = va_arg(f->args, vlong);
+			vu = (uvlong)va_arg(f->args, vlong);
 	}else if(fl & FmtLong){
 		if(fl & FmtUnsigned)
 			u = va_arg(f->args, ulong);
 		else
-			u = va_arg(f->args, long);
+			u = (ulong)va_arg(f->args, long);
 	}else if(fl & FmtByte){
 		if(fl & FmtUnsigned)
 			u = (uchar)va_arg(f->args, int);
 		else
-			u = (char)va_arg(f->args, int);
+			u = (uchar)(char)va_arg(f->args, int);
 	}else if(fl & FmtShort){
 		if(fl & FmtUnsigned)
 			u = (ushort)va_arg(f->args, int);
 		else
-			u = (short)va_arg(f->args, int);
+			u = (ushort)(short)va_arg(f->args, int);
 	}else{
 		if(fl & FmtUnsigned)
 			u = va_arg(f->args, uint);
 		else
-			u = va_arg(f->args, int);
+			u = (uint)va_arg(f->args, int);
 	}
 	conv = "0123456789abcdef";
 	grouping = "\4";	/* for hex, octal etc. (undefined by spec but nice) */
@@ -428,10 +428,10 @@ __ifmt(Fmt *f)
 	}
 	if(!(fl & FmtUnsigned)){
 		if(isv && (vlong)vu < 0){
-			vu = -(vlong)vu;
+			vu = (uvlong)-(vlong)vu;
 			neg = 1;
 		}else if(!isv && (long)u < 0){
-			u = -(long)u;
+			u = (ulong)-(long)u;
 			neg = 1;
 		}
 	}
@@ -440,11 +440,11 @@ __ifmt(Fmt *f)
 	excess = 0;	/* number of bytes > number runes */
 	ndig = 0;
 	len = utflen(thousands);
-	bytelen = strlen(thousands);
+	bytelen = (int)strlen(thousands);
 	if(isv){
 		while(vu){
-			i = vu % base;
-			vu /= base;
+			i = (int)(vu % (uvlong)base);
+			vu /= (uvlong)base;
 			if((fl & FmtComma) && n % 4 == 3){
 				*p-- = ',';
 				n++;
@@ -453,15 +453,15 @@ __ifmt(Fmt *f)
 				n += len;
 				excess += bytelen - len;
 				p -= bytelen;
-				memmove(p+1, thousands, bytelen);
+				memmove(p+1, thousands, (size_t)bytelen);
 			}
 			*p-- = conv[i];
 			n++;
 		}
 	}else{
 		while(u){
-			i = u % base;
-			u /= base;
+			i = (int)(u % (ulong)base);
+			u /= (ulong)base;
 			if((fl & FmtComma) && n % 4 == 3){
 				*p-- = ',';
 				n++;
@@ -470,7 +470,7 @@ __ifmt(Fmt *f)
 				n += len;
 				excess += bytelen - len;
 				p -= bytelen;
-				memmove(p+1, thousands, bytelen);
+				memmove(p+1, thousands, (size_t)bytelen);
 			}
 			*p-- = conv[i];
 			n++;
@@ -496,14 +496,14 @@ __ifmt(Fmt *f)
 		 * Zero values don't get 0x.
 		 */
 		if(f->r == 'x' || f->r == 'X')
-			fl &= ~FmtSharp;
+			fl &= ~(ulong)FmtSharp;
 	}
 	for(w = f->prec; n < w && p > buf+3; n++){
 		if((fl & FmtApost) && __needsep(&ndig, &grouping)){
 			n += len;
 			excess += bytelen - len;
 			p -= bytelen;
-			memmove(p+1, thousands, bytelen);
+			memmove(p+1, thousands, (size_t)bytelen);
 		}
 		*p-- = '0';
 	}
@@ -514,7 +514,7 @@ __ifmt(Fmt *f)
 			n += 2;
 		else if(base == 8){
 			if(p[1] == '0')
-				fl &= ~FmtSharp;
+				fl &= ~(ulong)FmtSharp;
 			else
 				n++;
 		}
@@ -528,15 +528,15 @@ __ifmt(Fmt *f)
 				n += len;
 				excess += bytelen - len;
 				p -= bytelen;
-				memmove(p+1, thousands, bytelen);
+				memmove(p+1, thousands, (size_t)bytelen);
 			}
 			*p-- = '0';
 		}
-		f->flags &= ~FmtWidth;
+		f->flags &= ~(ulong)FmtWidth;
 	}
 	if(fl & FmtSharp){
 		if(base == 16)
-			*p-- = f->r;
+			*p-- = (char)f->r;
 		if(base == 16 || base == 8)
 			*p-- = '0';
 	}
@@ -546,7 +546,7 @@ __ifmt(Fmt *f)
 		*p-- = '+';
 	else if(fl & FmtSpace)
 		*p-- = ' ';
-	f->flags &= ~FmtPrec;
+	f->flags &= ~(ulong)FmtPrec;
 	return __fmtcpy(f, p + 1, n, n + excess);
 }
 
@@ -563,9 +563,9 @@ __countfmt(Fmt *f)
 	}else if(fl & FmtLong){
 		*(long*)p = f->nfmt;
 	}else if(fl & FmtByte){
-		*(char*)p = f->nfmt;
+		*(char*)p = (char)f->nfmt;
 	}else if(fl & FmtShort){
-		*(short*)p = f->nfmt;
+		*(short*)p = (short)f->nfmt;
 	}else{
 		*(int*)p = f->nfmt;
 	}
diff --git a/src/lib9/fmt/dorfmt.c b/src/lib9/fmt/dorfmt.c
index 672742f02..c18d9ee5d 100644
--- a/src/lib9/fmt/dorfmt.c
+++ b/src/lib9/fmt/dorfmt.c
@@ -27,7 +27,7 @@ int
 dorfmt(Fmt *f, const Rune *fmt)
 {
 	Rune *rt, *rs;
-	int r;
+	Rune r;
 	char *t, *s;
 	int nfmt;
 
@@ -39,7 +39,7 @@ dorfmt(Fmt *f, const Rune *fmt)
 			while((r = *fmt++) && r != '%'){
 				FMTRCHAR(f, rt, rs, r);
 			}
-			f->nfmt += rt - (Rune *)f->to;
+			f->nfmt += (int)(rt - (Rune *)f->to);
 			f->to = rt;
 			if(!r)
 				return f->nfmt - nfmt;
@@ -50,7 +50,7 @@ dorfmt(Fmt *f, const Rune *fmt)
 			while((r = *fmt++) && r != '%'){
 				FMTRUNE(f, t, f->stop, r);
 			}
-			f->nfmt += t - (char *)f->to;
+			f->nfmt += (int)(t - (char *)f->to);
 			f->to = t;
 			if(!r)
 				return f->nfmt - nfmt;
diff --git a/src/lib9/fmt/fltfmt.c b/src/lib9/fmt/fltfmt.c
index 9f3f3edab..dec6f8480 100644
--- a/src/lib9/fmt/fltfmt.c
+++ b/src/lib9/fmt/fltfmt.c
@@ -103,7 +103,7 @@ xadd1(char *a, int n)
 	for(b = a+n-1; b >= a; b--) {
 		c = *b + 1;
 		if(c <= '9') {
-			*b = c;
+			*b = (char)c;
 			return 0;
 		}
 		*b = '0';
@@ -144,7 +144,7 @@ xsub1(char *a, int n)
 				*b = '9';
 				return 1;
 			}
-			*b = c;
+			*b = (char)c;
 			return 0;
 		}
 		*b = '9';
@@ -173,7 +173,7 @@ xfmtexp(char *p, int e, int ucase)
 		*p++ = '+';
 	i = 0;
 	while(e) {
-		se[i++] = e % 10 + '0';
+		se[i++] = (char)(e % 10 + '0');
 		e /= 10;
 	}
 	while(i < 2)
@@ -192,7 +192,8 @@ xfmtexp(char *p, int e, int ucase)
 static void
 xdtoa(double f, char *s, int *exp, int *neg, int *ns)
 {
-	int c, d, e2, e, ee, i, ndigit, oerrno;
+	int d, e2, e, ee, i, ndigit, oerrno;
+	char c;
 	char tmp[NSIGNIF+10];
 	double g;
 
@@ -239,7 +240,7 @@ xdtoa(double f, char *s, int *exp, int *neg, int *ns)
 	 */
 	for(i=0; i<NSIGNIF; i++) {
 		d = (int)g;
-		s[i] = d+'0';
+		s[i] = (char)(d+'0');
 		g = (g-d) * 10;
 	}
 	s[i] = 0;
@@ -350,12 +351,13 @@ __efgfmt(Fmt *fmt)
 {
 	char buf[NSIGNIF+10], *dot, *digits, *p, *s, suf[10], *t;
 	double f;
-	int c, chr, dotwid, e, exp, fl, ndigits, neg, newndigits;
+	int c, chr, dotwid, e, exp, ndigits, neg, newndigits;
 	int pad, point, prec, realchr, sign, sufwid, ucase, wid, z1, z2;
+	ulong fl;
 	Rune r, *rs, *rt;
 
 	if(fmt->flags&FmtLong)
-		f = va_arg(fmt->args, long double);
+		f = (double)va_arg(fmt->args, long double);
 	else
 		f = va_arg(fmt->args, double);
 
@@ -367,7 +369,7 @@ __efgfmt(Fmt *fmt)
 	prec = FDEFLT;
 	if(fl & FmtPrec)
 		prec = fmt->prec;
-	chr = fmt->r;
+	chr = (int)fmt->r;
 	ucase = 0;
 	switch(chr) {
 	case 'A':
@@ -386,7 +388,7 @@ __efgfmt(Fmt *fmt)
 		s = special[0+ucase];
 	special:
 		fmt->flags = fl & (FmtWidth|FmtLeft);
-		return __fmtcpy(fmt, s, strlen(s), strlen(s));
+		return __fmtcpy(fmt, s, (int)strlen(s), (int)strlen(s));
 	}
 	if(__isInf(f, 1)) {
 		s = special[2+ucase];
@@ -488,7 +490,7 @@ __efgfmt(Fmt *fmt)
 			z2 = 0;
 		}
 		xfmtexp(suf, e, ucase);
-		sufwid = strlen(suf);
+		sufwid = (int)strlen(suf);
 		break;
 
 	casef:
@@ -638,7 +640,7 @@ __efgfmt(Fmt *fmt)
 				}
 			}
 		}
-		fmt->nfmt += rt - (Rune*)fmt->to;
+		fmt->nfmt += (int)(rt - (Rune*)fmt->to);
 		fmt->to = rt;
 		if(sufwid && __fmtcpy(fmt, suf, sufwid, sufwid) < 0)
 			return -1;
@@ -667,7 +669,7 @@ __efgfmt(Fmt *fmt)
 				for(p=dot; *p; p++)
 					FMTCHAR(fmt, t, s, *p);
 		}
-		fmt->nfmt += t - (char*)fmt->to;
+		fmt->nfmt += (int)(t - (char*)fmt->to);
 		fmt->to = t;
 		if(sufwid && __fmtcpy(fmt, suf, sufwid, sufwid) < 0)
 			return -1;
diff --git a/src/lib9/fmt/fmt.c b/src/lib9/fmt/fmt.c
index 7a747b1b1..7e576773b 100644
--- a/src/lib9/fmt/fmt.c
+++ b/src/lib9/fmt/fmt.c
@@ -187,12 +187,12 @@ __fmtdispatch(Fmt *f, void *fmt, int isrunes)
 		case '5': case '6': case '7': case '8': case '9':
 			i = 0;
 			while(r >= '0' && r <= '9'){
-				i = i * 10 + r - '0';
+				i = i * 10 + (int)r - '0';
 				if(isrunes){
 					r = *(Rune*)fmt;
 					fmt = (Rune*)fmt + 1;
 				}else{
-					r = *(char*)fmt;
+					r = (Rune)*(char*)fmt;
 					fmt = (char*)fmt + 1;
 				}
 			}
@@ -217,7 +217,7 @@ __fmtdispatch(Fmt *f, void *fmt, int isrunes)
 				 * ignore the precision.
 				 */
 				if(f->flags & FmtPrec){
-					f->flags &= ~FmtPrec;
+					f->flags &= ~(ulong)FmtPrec;
 					f->prec = 0;
 					continue;
 				}
@@ -226,7 +226,7 @@ __fmtdispatch(Fmt *f, void *fmt, int isrunes)
 			}
 			goto numflag;
 		}
-		n = (*fmtfmt(r))(f);
+		n = (*fmtfmt((int)r))(f);
 		if(n < 0)
 			return nil;
 		if(n == 0)
diff --git a/src/lib9/fmt/fmtdef.h b/src/lib9/fmt/fmtdef.h
index 74cb8a8d2..4bbd9f578 100644
--- a/src/lib9/fmt/fmtdef.h
+++ b/src/lib9/fmt/fmtdef.h
@@ -75,7 +75,7 @@ int          __strfmt(Fmt *f);
 		else\
 			return -1;\
 	}\
-	*t++ = c;\
+	*t++ = (char)c;\
 	}while(0)
 
 #define FMTRCHAR(f, t, s, c)\
@@ -87,7 +87,7 @@ int          __strfmt(Fmt *f);
 		else\
 			return -1;\
 	}\
-	*t++ = c;\
+	*t++ = (Rune)c;\
 	}while(0)
 
 #define FMTRUNE(f, t, s, r)\
@@ -102,7 +102,7 @@ int          __strfmt(Fmt *f);
 			return -1;\
 	}\
 	if(r < Runeself)\
-		*t++ = r;\
+		*t++ = (char)r;\
 	else{\
 		_rune = r;\
 		t += runetochar(t, &_rune);\
diff --git a/src/lib9/fmt/fmtfdflush.c b/src/lib9/fmt/fmtfdflush.c
index c9854cee5..401acbea7 100644
--- a/src/lib9/fmt/fmtfdflush.c
+++ b/src/lib9/fmt/fmtfdflush.c
@@ -29,8 +29,8 @@ __fmtFdFlush(Fmt *f)
 {
 	int n;
 
-	n = (char*)f->to - (char*)f->start;
-	if(n && write((uintptr)f->farg, f->start, n) != n)
+	n = (int)((char*)f->to - (char*)f->start);
+	if(n && (int)write((int)(uintptr)f->farg, f->start, (size_t)n) != n)
 		return 0;
 	f->to = f->start;
 	return 1;
diff --git a/src/lib9/fmt/fmtquote.c b/src/lib9/fmt/fmtquote.c
index b9ac772ed..93b2abbe7 100644
--- a/src/lib9/fmt/fmtquote.c
+++ b/src/lib9/fmt/fmtquote.c
@@ -69,7 +69,7 @@ __quotesetup(char *s, Rune *r, int nin, int nout, Quoteinfo *q, int sharp, int r
 				break;
 		}
 
-		if((c <= L' ') || (c == L'\'') || (fmtdoquote!=nil && fmtdoquote(c))){
+		if((c <= L' ') || (c == L'\'') || (fmtdoquote!=nil && fmtdoquote((int)c))){
 			if(!q->quoted){
 				if(runesout){
 					if(1+q->nrunesout+1+1 > nout)	/* no room for quotes */
@@ -152,7 +152,7 @@ qstrfmt(char *sin, Rune *rin, Quoteinfo *q, Fmt *f)
 			r = *(uchar*)m;
 			if(r < Runeself)
 				m++;
-			else if((me - m) >= UTFmax || fullrune(m, me-m))
+			else if((me - m) >= UTFmax || fullrune(m, (int)(me-m)))
 				m += chartorune(&r, m);
 			else
 				break;
@@ -175,14 +175,14 @@ qstrfmt(char *sin, Rune *rin, Quoteinfo *q, Fmt *f)
 	if(f->runes){
 		FMTRCHAR(f, rt, rs, '\'');
 		USED(rs);
-		f->nfmt += rt - (Rune *)f->to;
+		f->nfmt += (int)(rt - (Rune *)f->to);
 		f->to = rt;
 		if(fl & FmtLeft && __rfmtpad(f, w - q->nrunesout) < 0)
 			return -1;
 	}else{
 		FMTRUNE(f, t, s, '\'');
 		USED(s);
-		f->nfmt += t - (char *)f->to;
+		f->nfmt += (int)(t - (char *)f->to);
 		f->to = t;
 		if(fl & FmtLeft && __fmtpad(f, w - q->nbytesout) < 0)
 			return -1;
@@ -214,9 +214,9 @@ __quotestrfmt(int runesin, Fmt *f)
 	if(f->flush)
 		outlen = 0x7FFFFFFF;	/* if we can flush, no output limit */
 	else if(f->runes)
-		outlen = (Rune*)f->stop - (Rune*)f->to;
+		outlen = (int)((Rune*)f->stop - (Rune*)f->to);
 	else
-		outlen = (char*)f->stop - (char*)f->to;
+		outlen = (int)((char*)f->stop - (char*)f->to);
 
 	__quotesetup(s, r, nin, outlen, &q, f->flags&FmtSharp, f->runes);
 /*print("bytes in %d bytes out %d runes in %d runesout %d\n", q.nbytesin, q.nbytesout, q.nrunesin, q.nrunesout); */
diff --git a/src/lib9/fmt/fmtrune.c b/src/lib9/fmt/fmtrune.c
index da8c5d746..2bc8d28e6 100644
--- a/src/lib9/fmt/fmtrune.c
+++ b/src/lib9/fmt/fmtrune.c
@@ -34,8 +34,8 @@ fmtrune(Fmt *f, int r)
 		n = 1;
 	}else{
 		t = (char*)f->to;
-		FMTRUNE(f, t, f->stop, r);
-		n = t - (char*)f->to;
+		FMTRUNE(f, t, f->stop, (Rune)r);
+		n = (int)(t - (char*)f->to);
 		f->to = t;
 	}
 	f->nfmt += n;
diff --git a/src/lib9/fmt/sprint.c b/src/lib9/fmt/sprint.c
index 38d430744..02655ad12 100644
--- a/src/lib9/fmt/sprint.c
+++ b/src/lib9/fmt/sprint.c
@@ -36,10 +36,10 @@ sprint(char *buf, char *fmt, ...)
 	 * optimizes the test away.  casting to uintptr works around this bug.
 	 */
 	if((uintptr)buf+len < (uintptr)buf)
-		len = -(uintptr)buf-1;
+		len = (uint)-(uintptr)buf-1;
 
 	va_start(args, fmt);
-	n = vsnprint(buf, len, fmt, args);
+	n = (int)vsnprint(buf, (int)len, fmt, args);
 	va_end(args);
 	return n;
 }
diff --git a/src/lib9/fmt/strtod.c b/src/lib9/fmt/strtod.c
index 6bb56c112..ec185d2d5 100644
--- a/src/lib9/fmt/strtod.c
+++ b/src/lib9/fmt/strtod.c
@@ -124,7 +124,7 @@ fmtstrtod(const char *as, char **aas)
 				continue;
 			}
 			if(na < Ndig-50)
-				a[na++] = c;
+				a[na++] = (char)c;
 			continue;
 		}
 		switch(c) {
@@ -240,7 +240,7 @@ fmtstrtod(const char *as, char **aas)
 	mid[0] = 0;
 	mid[1] = 1;
 	for(i=0; (c=a[i]) != '\0'; i++) {
-		mid[0] = mid[0]*10 + (c-'0');
+		mid[0] = mid[0]*10 + (ulong)(c-'0');
 		mid[1] = mid[1]*10;
 		if(i >= 8)
 			break;
@@ -287,13 +287,13 @@ fmtstrtod(const char *as, char **aas)
 		/* only hard part is if even/odd roundings wants to go up */
 		c = mid[Prec-1] & (Sigbit-1);
 		if(c == Sigbit/2 && (mid[Prec-1]&Sigbit) == 0)
-			mid[Prec-1] -= c;
+			mid[Prec-1] -= (ulong)c;
 		break;	/* exactly mid */
 	}
 
 	/* normal rounding applies */
 	c = mid[Prec-1] & (Sigbit-1);
-	mid[Prec-1] -= c;
+	mid[Prec-1] -= (ulong)c;
 	if(c >= Sigbit/2) {
 		mid[Prec-1] += Sigbit;
 		frnorm(mid);
@@ -317,7 +317,7 @@ retinf:
 out:
 	d = 0;
 	for(i=0; i<Prec; i++)
-		d = d*One + mid[i];
+		d = d*One + (double)mid[i];
 	if(flag & Fsign)
 		d = -d;
 	d = ldexp(d, bp - Prec*Nbits);
@@ -330,7 +330,8 @@ out:
 static void
 frnorm(ulong *f)
 {
-	int i, c;
+	int i;
+	ulong c;
 
 	c = 0;
 	for(i=Prec-1; i>0; i--) {
@@ -355,7 +356,7 @@ fpcmp(char *a, ulong* f)
 		for(i=0; i<Prec; i++)
 			tf[i] = tf[i]*10;
 		frnorm(tf);
-		d = (tf[0] >> Nbits) + '0';
+		d = (int)(tf[0] >> Nbits) + '0';
 		tf[0] &= One-1;
 
 		/* compare next digit */
@@ -404,7 +405,7 @@ divby(char *a, int *na, int b)
 	for(;;) {
 		c = n>>b;
 		n -= c<<b;
-		*p++ = c + '0';
+		*p++ = (char)(c + '0');
 		c = *a++;
 		if(c == 0)
 			break;
@@ -416,7 +417,7 @@ xx:
 		n = n*10;
 		c = n>>b;
 		n -= c<<b;
-		*p++ = c + '0';
+		*p++ = (char)(c + '0');
 		(*na)++;
 	}
 	*p = 0;
@@ -447,7 +448,7 @@ divascii(char *a, int *na, int *dp, int *bp)
 		d = (int)(nelem(tab1))-1;
 	t = tab1 + d;
 	b = t->bp;
-	if(memcmp(a, t->cmp, t->siz) > 0)
+	if(memcmp(a, t->cmp, (size_t)t->siz) > 0)
 		d--;
 	*dp -= d;
 	*bp += b;
@@ -470,14 +471,14 @@ mulby(char *a, char *p, char *q, int b)
 		n = c/10;
 		c -= n*10;
 		p--;
-		*p = c + '0';
+		*p = (char)(c + '0');
 	}
 	while(n) {
 		c = n;
 		n = c/10;
 		c -= n*10;
 		p--;
-		*p = c + '0';
+		*p = (char)(c + '0');
 	}
 }
 
@@ -507,7 +508,7 @@ mulascii(char *a, int *na, int *dp, int *bp)
 		d = (int)(nelem(tab2))-1;
 	t = tab2 + d;
 	b = t->bp;
-	if(memcmp(a, t->cmp, t->siz) < 0)
+	if(memcmp(a, t->cmp, (size_t)t->siz) < 0)
 		d--;
 	p = a + *na;
 	*bp -= b;
diff --git a/src/lib9/fmt/vsmprint.c b/src/lib9/fmt/vsmprint.c
index 4bd0bc4b7..46086f9e2 100644
--- a/src/lib9/fmt/vsmprint.c
+++ b/src/lib9/fmt/vsmprint.c
@@ -28,10 +28,10 @@ fmtStrFlush(Fmt *f)
 
 	if(f->start == nil)
 		return 0;
-	n = (uintptr)f->farg;
+	n = (int)(uintptr)f->farg;
 	n *= 2;
 	s = (char*)f->start;
-	f->start = realloc(s, n);
+	f->start = realloc(s, (size_t)n);
 	if(f->start == nil){
 		f->farg = nil;
 		f->to = nil;
@@ -53,7 +53,7 @@ fmtstrinit(Fmt *f)
 	memset(f, 0, sizeof *f);
 	f->runes = 0;
 	n = 32;
-	f->start = malloc(n);
+	f->start = malloc((size_t)n);
 	if(f->start == nil)
 		return -1;
 	f->to = f->start;
diff --git a/src/lib9/fmt/vsnprint.c b/src/lib9/fmt/vsnprint.c
index 33d6bba4d..6b3877205 100644
--- a/src/lib9/fmt/vsnprint.c
+++ b/src/lib9/fmt/vsnprint.c
@@ -39,5 +39,5 @@ vsnprint(char *buf, int len, char *fmt, va_list args)
 	dofmt(&f, fmt);
 	VA_END(f.args);
 	*(char*)f.to = '\0';
-	return (char*)f.to - buf;
+	return (int)((char*)f.to - buf);
 }
diff --git a/src/lib9/getwd.c b/src/lib9/getwd.c
index 566d3f647..cbfd9d643 100644
--- a/src/lib9/getwd.c
+++ b/src/lib9/getwd.c
@@ -50,5 +50,5 @@ p9getwd(char *s, int ns)
 		return s;
 	}
 
-	return getcwd(s, ns);
+	return getcwd(s, (size_t)ns);
 }
diff --git a/src/lib9/readn.c b/src/lib9/readn.c
index f39b4a4c2..3c80a4fc0 100644
--- a/src/lib9/readn.c
+++ b/src/lib9/readn.c
@@ -36,7 +36,7 @@ readn(int f, void *av, long n)
 	a = av;
 	t = 0;
 	while(t < n){
-		m = read(f, a+t, n-t);
+		m = read(f, a+t, (size_t)(n-t));
 		if(m <= 0){
 			if(t == 0)
 				return m;
diff --git a/src/lib9/rfork.c b/src/lib9/rfork.c
index 5a6eaeb94..c4ae90f97 100644
--- a/src/lib9/rfork.c
+++ b/src/lib9/rfork.c
@@ -82,7 +82,7 @@ p9rfork(int flags)
 					close(p[0]);
 					return -1;
 				}
-				n = readn(p[0], buf, sizeof buf-1);
+				n = (int)readn(p[0], buf, sizeof buf-1);
 				close(p[0]);
 				if(!WIFEXITED(status) || WEXITSTATUS(status)!=0 || n <= 0){
 					if(!WIFEXITED(status))
@@ -102,7 +102,7 @@ p9rfork(int flags)
 					werrstr("%s", buf+2);
 					return -1;
 				}
-				pid = strtol(buf, &q, 0);
+				pid = (int)strtol(buf, &q, 0);
 			}else{
 				/*
 				 * Child - fork a new child whose wait message can't
diff --git a/src/lib9/strecpy.c b/src/lib9/strecpy.c
index 389fdc8a0..03dc6ea50 100644
--- a/src/lib9/strecpy.c
+++ b/src/lib9/strecpy.c
@@ -32,7 +32,7 @@ strecpy(char *to, char *e, char *from)
 {
 	if(to >= e)
 		return to;
-	to = memccpy(to, from, '\0', e - to);
+	to = memccpy(to, from, '\0', (size_t)(e - to));
 	if(to == nil){
 		to = e - 1;
 		*to = '\0';
diff --git a/src/lib9/tokenize.c b/src/lib9/tokenize.c
index 52167ff2f..a9b593567 100644
--- a/src/lib9/tokenize.c
+++ b/src/lib9/tokenize.c
@@ -37,7 +37,7 @@ qtoken(char *s, char *sep)
 
 	quoting = 0;
 	t = s;	/* s is output string, t is input string */
-	while(*t!='\0' && (quoting || utfrune(sep, *t)==nil)){
+	while(*t!='\0' && (quoting || utfrune(sep, (Rune)*t)==nil)){
 		if(*t != '\''){
 			*s++ = *t++;
 			continue;
@@ -74,7 +74,7 @@ etoken(char *t, char *sep)
 
 	/* move to end of next token */
 	quoting = 0;
-	while(*t!='\0' && (quoting || utfrune(sep, *t)==nil)){
+	while(*t!='\0' && (quoting || utfrune(sep, (Rune)*t)==nil)){
 		if(*t != '\''){
 			t++;
 			continue;
@@ -104,7 +104,7 @@ gettokens(char *s, char **args, int maxargs, char *sep)
 	int nargs;
 
 	for(nargs=0; nargs<maxargs; nargs++){
-		while(*s!='\0' && utfrune(sep, *s)!=nil)
+		while(*s!='\0' && utfrune(sep, (Rune)*s)!=nil)
 			*s++ = '\0';
 		if(*s == '\0')
 			break;
@@ -121,7 +121,7 @@ tokenize(char *s, char **args, int maxargs)
 	int nargs;
 
 	for(nargs=0; nargs<maxargs; nargs++){
-		while(*s!='\0' && utfrune(qsep, *s)!=nil)
+		while(*s!='\0' && utfrune(qsep, (Rune)*s)!=nil)
 			s++;
 		if(*s == '\0')
 			break;
diff --git a/src/lib9/utf/rune.c b/src/lib9/utf/rune.c
index 913b786da..99f03eaa3 100644
--- a/src/lib9/utf/rune.c
+++ b/src/lib9/utf/rune.c
@@ -80,7 +80,7 @@ charntorune(Rune *rune, const char *str, int length)
 	 */
 	c = *(uchar*)str;
 	if(c < Tx) {
-		*rune = c;
+		*rune = (Rune)c;
 		return 1;
 	}
 
@@ -102,7 +102,7 @@ charntorune(Rune *rune, const char *str, int length)
 		l = ((c << Bitx) | c1) & Rune2;
 		if(l <= Rune1)
 			goto bad;
-		*rune = l;
+		*rune = (Rune)l;
 		return 2;
 	}
 
@@ -124,7 +124,7 @@ charntorune(Rune *rune, const char *str, int length)
 			goto bad;
 		if (SurrogateMin <= l && l <= SurrogateMax)
 			goto bad;
-		*rune = l;
+		*rune = (Rune)l;
 		return 3;
 	}
 
@@ -142,7 +142,7 @@ charntorune(Rune *rune, const char *str, int length)
 		l = ((((((c << Bitx) | c1) << Bitx) | c2) << Bitx) | c3) & Rune4;
 		if (l <= Rune3 || l > Runemax)
 			goto bad;
-		*rune = l;
+		*rune = (Rune)l;
 		return 4;
 	}
 
@@ -178,7 +178,7 @@ chartorune(Rune *rune, const char *str)
 	 */
 	c = *(uchar*)str;
 	if(c < Tx) {
-		*rune = c;
+		*rune = (Rune)c;
 		return 1;
 	}
 
@@ -195,7 +195,7 @@ chartorune(Rune *rune, const char *str)
 		l = ((c << Bitx) | c1) & Rune2;
 		if(l <= Rune1)
 			goto bad;
-		*rune = l;
+		*rune = (Rune)l;
 		return 2;
 	}
 
@@ -212,7 +212,7 @@ chartorune(Rune *rune, const char *str)
 			goto bad;
 		if (SurrogateMin <= l && l <= SurrogateMax)
 			goto bad;
-		*rune = l;
+		*rune = (Rune)l;
 		return 3;
 	}
 
@@ -227,7 +227,7 @@ chartorune(Rune *rune, const char *str)
 		l = ((((((c << Bitx) | c1) << Bitx) | c2) << Bitx) | c3) & Rune4;
 		if (l <= Rune3 || l > Runemax)
 			goto bad;
-		*rune = l;
+		*rune = (Rune)l;
 		return 4;
 	}
 
@@ -263,7 +263,7 @@ runetochar(char *str, const Rune *rune)
 	 */
 	c = *rune;
 	if(c <= Rune1) {
-		str[0] = c;
+		str[0] = (char)c;
 		return 1;
 	}
 
@@ -272,8 +272,8 @@ runetochar(char *str, const Rune *rune)
 	 *	0080-07FF => T2 Tx
 	 */
 	if(c <= Rune2) {
-		str[0] = T2 | (c >> 1*Bitx);
-		str[1] = Tx | (c & Maskx);
+		str[0] = (char)(T2 | (c >> 1*Bitx));
+		str[1] = (char)(Tx | (c & Maskx));
 		return 2;
 	}
 
@@ -293,9 +293,9 @@ runetochar(char *str, const Rune *rune)
 	 *	0800-FFFF => T3 Tx Tx
 	 */
 	if (c <= Rune3) {
-		str[0] = T3 |  (c >> 2*Bitx);
-		str[1] = Tx | ((c >> 1*Bitx) & Maskx);
-		str[2] = Tx |  (c & Maskx);
+		str[0] = (char)(T3 |  (c >> 2*Bitx));
+		str[1] = (char)(Tx | ((c >> 1*Bitx) & Maskx));
+		str[2] = (char)(Tx |  (c & Maskx));
 		return 3;
 	}
 
@@ -303,10 +303,10 @@ runetochar(char *str, const Rune *rune)
 	 * four character sequence (21-bit value)
 	 *     10000-1FFFFF => T4 Tx Tx Tx
 	 */
-	str[0] = T4 | (c >> 3*Bitx);
-	str[1] = Tx | ((c >> 2*Bitx) & Maskx);
-	str[2] = Tx | ((c >> 1*Bitx) & Maskx);
-	str[3] = Tx | (c & Maskx);
+	str[0] = (char)(T4 | (c >> 3*Bitx));
+	str[1] = (char)(Tx | ((c >> 2*Bitx) & Maskx));
+	str[2] = (char)(Tx | ((c >> 1*Bitx) & Maskx));
+	str[3] = (char)(Tx | (c & Maskx));
 	return 4;
 }
 
@@ -325,7 +325,7 @@ runenlen(const Rune *r, int nrune)
 
 	nb = 0;
 	while(nrune--) {
-		c = *r++;
+		c = (int)*r++;
 		if (c <= Rune1)
 			nb++;
 		else if (c <= Rune2)
diff --git a/src/lib9/utf/utfecpy.c b/src/lib9/utf/utfecpy.c
index 76fb571d3..2eca85ef6 100644
--- a/src/lib9/utf/utfecpy.c
+++ b/src/lib9/utf/utfecpy.c
@@ -23,7 +23,7 @@ utfecpy(char *to, char *e, const char *from)
 
 	if(to >= e)
 		return to;
-	end = memccpy(to, from, '\0', e - to);
+	end = memccpy(to, from, '\0', (size_t)(e - to));
 	if(end == nil){
 		end = e-1;
 		while(end>to && (*--end&0xC0)==0x80)
diff --git a/src/lib9/utf/utflen.c b/src/lib9/utf/utflen.c
index 843e6773f..42fcb33ab 100644
--- a/src/lib9/utf/utflen.c
+++ b/src/lib9/utf/utflen.c
@@ -18,7 +18,7 @@ int
 utflen(const char *s)
 {
 	int c;
-	long n;
+	int n;
 	Rune rune;
 
 	n = 0;
diff --git a/src/lib9/utf/utfnlen.c b/src/lib9/utf/utfnlen.c
index 4b02e6a33..d6ef5fa06 100644
--- a/src/lib9/utf/utfnlen.c
+++ b/src/lib9/utf/utfnlen.c
@@ -18,7 +18,7 @@ int
 utfnlen(const char *s, long m)
 {
 	int c;
-	long n;
+	int n;
 	Rune rune;
 	const char *es;
 
@@ -31,7 +31,7 @@ utfnlen(const char *s, long m)
 			s++;
 			continue;
 		}
-		if(!fullrune(s, es-s))
+		if(!fullrune(s, (int)(es-s)))
 			break;
 		s += chartorune(&rune, s);
 	}
diff --git a/src/lib9/utf/utfrrune.c b/src/lib9/utf/utfrrune.c
index 2273ec551..9e28af82a 100644
--- a/src/lib9/utf/utfrrune.c
+++ b/src/lib9/utf/utfrrune.c
@@ -24,7 +24,7 @@ utfrrune(const char *s, Rune c)
 	const char *s1;
 
 	if(c < Runesync)		/* not part of utf sequence */
-		return strrchr(s, c);
+		return strrchr(s, (char)c);
 
 	s1 = 0;
 	for(;;) {
diff --git a/src/lib9/utf/utfrune.c b/src/lib9/utf/utfrune.c
index 863a1846f..0136b2821 100644
--- a/src/lib9/utf/utfrune.c
+++ b/src/lib9/utf/utfrune.c
@@ -24,7 +24,7 @@ utfrune(const char *s, Rune c)
 	int n;
 
 	if(c < Runesync)		/* not part of utf sequence */
-		return strchr(s, c);
+		return strchr(s, (char)c);
 
 	for(;;) {
 		c1 = *(uchar*)s;
diff --git a/src/lib9/utf/utfutf.c b/src/lib9/utf/utfutf.c
index 79098535b..e46ddd923 100644
--- a/src/lib9/utf/utfutf.c
+++ b/src/lib9/utf/utfutf.c
@@ -25,7 +25,8 @@ char*
 utfutf(const char *s1, const char *s2)
 {
 	const char *p;
-	long f, n1, n2;
+	long f, n1;
+	size_t n2;
 	Rune r;
 
 	n1 = chartorune(&r, s2);
@@ -34,7 +35,7 @@ utfutf(const char *s1, const char *s2)
 		return strstr(s1, s2);
 
 	n2 = strlen(s2);
-	for(p=s1; (p=utfrune(p, f)) != 0; p+=n1)
+	for(p=s1; (p=utfrune(p, r)) != 0; p+=n1)
 		if(strncmp(p, s2, n2) == 0)
 			return p;
 	return 0;