libbio: add casts to remove -Wconversion warnings

Update #5764

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/12388043

src/libbio/bflush.c

@@ -37,7 +37,7 @@ Bflush(Biobuf *bp)
 		n = bp->bsize+bp->ocount;
 		if(n == 0)
 			return 0;
-		c = write(bp->fid, bp->bbuf, n);
+		c = (int)write(bp->fid, bp->bbuf, (size_t)n);
 		if(n == c) {
 			bp->offset += n;
 			bp->ocount = -bp->bsize;

src/libbio/bgetc.c

@@ -49,7 +49,7 @@ loop:
 	 * buffer to allow that many ungets.
 	 */
 	memmove(bp->bbuf-Bungetsize, bp->ebuf-Bungetsize, Bungetsize);
-	i = read(bp->fid, bp->bbuf, bp->bsize);
+	i = (int)read(bp->fid, bp->bbuf, (size_t)bp->bsize);
 	bp->gbuf = bp->bbuf;
 	if(i <= 0) {
 		bp->state = Bracteof;
@@ -58,7 +58,7 @@ loop:
 		return Beof;
 	}
 	if(i < bp->bsize) {
-		memmove(bp->ebuf-i-Bungetsize, bp->bbuf-Bungetsize, i+Bungetsize);
+		memmove(bp->ebuf-i-Bungetsize, bp->bbuf-Bungetsize, (size_t)(i+Bungetsize));
 		bp->gbuf = bp->ebuf-i;
 	}
 	bp->icount = -i;

src/libbio/bgetrune.c

@@ -40,13 +40,13 @@ Bgetrune(Biobuf *bp)
 		bp->runesize = 1;
 		return c;
 	}
-	str[0] = c;
+	str[0] = (char)c;
 
 	for(i=1;;) {
 		c = Bgetc(bp);
 		if(c < 0)
 			return c;
-		str[i++] = c;
+		str[i++] = (char)c;
 
 		if(fullrune(str, i)) {
 			bp->runesize = chartorune(&rune, str);

src/libbio/bprint.c

@@ -49,7 +49,7 @@ bflush(Fmt *f)
 		return 0;
 
 	bp = f->farg;
-	bp->ocount = (char*)f->to - (char*)f->stop;
+	bp->ocount = (int)((char*)f->to - (char*)f->stop);
 	if(Bflush(bp) < 0) {
 		f->stop = nil;
 		f->to = nil;
@@ -76,7 +76,7 @@ Bvprint(Biobuf *bp, char *fmt, va_list arg)
 	n = fmtvprint(&f, fmt, arg);
 
 	if(f.stop != nil)
-		bp->ocount = (char*)f.to - (char*)f.stop;
+		bp->ocount = (int)((char*)f.to - (char*)f.stop);
 
 	return n;
 }

src/libbio/bputc.c

@@ -35,7 +35,7 @@ Bputc(Biobuf *bp, int c)
 	for(;;) {
 		i = bp->ocount;
 		if(i) {
-			bp->ebuf[i++] = c;
+			bp->ebuf[i++] = (unsigned char)c;
 			bp->ocount = i;
 			return 0;
 		}

src/libbio/bputrune.c

@@ -35,9 +35,9 @@ Bputrune(Biobuf *bp, long c)
 	char str[UTFmax];
 	int n;
 
-	rune = c;
+	rune = (Rune)c;
 	if(rune < Runeself) {
-		Bputc(bp, rune);
+		Bputc(bp, (int)rune);
 		return 1;
 	}
 	n = runetochar(str, &rune);

src/libbio/brdline.c

@@ -51,9 +51,9 @@ Brdline(Biobuf *bp, int delim)
 	 * first try in remainder of buffer (gbuf doesn't change)
 	 */
 	ip = (char*)bp->ebuf - i;
-	ep = memchr(ip, delim, i);
+	ep = memchr(ip, delim, (size_t)i);
 	if(ep) {
-		j = (ep - ip) + 1;
+		j = (int)((ep - ip) + 1);
 		bp->rdline = j;
 		bp->icount += j;
 		return ip;
@@ -63,7 +63,7 @@ Brdline(Biobuf *bp, int delim)
 	 * copy data to beginning of buffer
 	 */
 	if(i < bp->bsize)
-		memmove(bp->bbuf, ip, i);
+		memmove(bp->bbuf, ip, (size_t)i);
 	bp->gbuf = bp->bbuf;
 
 	/*
@@ -71,12 +71,12 @@ Brdline(Biobuf *bp, int delim)
 	 */
 	ip = (char*)bp->bbuf + i;
 	while(i < bp->bsize) {
-		j = read(bp->fid, ip, bp->bsize-i);
+		j = (int)read(bp->fid, ip, (size_t)(bp->bsize-i));
 		if(j <= 0) {
 			/*
 			 * end of file with no delim
 			 */
-			memmove(bp->ebuf-i, bp->bbuf, i);
+			memmove(bp->ebuf-i, bp->bbuf, (size_t)i);
 			bp->rdline = i;
 			bp->icount = -i;
 			bp->gbuf = bp->ebuf-i;
@@ -84,7 +84,7 @@ Brdline(Biobuf *bp, int delim)
 		}
 		bp->offset += j;
 		i += j;
-		ep = memchr(ip, delim, j);
+		ep = memchr(ip, delim, (size_t)j);
 		if(ep) {
 			/*
 			 * found in new piece
@@ -92,10 +92,10 @@ Brdline(Biobuf *bp, int delim)
 			 */
 			ip = (char*)bp->ebuf - i;
 			if(i < bp->bsize){
-				memmove(ip, bp->bbuf, i);
+				memmove(ip, bp->bbuf, (size_t)i);
 				bp->gbuf = (unsigned char*)ip;
 			}
-			j = (ep - (char*)bp->bbuf) + 1;
+			j = (int)((ep - (char*)bp->bbuf) + 1);
 			bp->rdline = j;
 			bp->icount = j - i;
 			return ip;

src/libbio/brdstr.c

@@ -37,14 +37,14 @@ Brdstr(Biobuf *bp, int delim, int nulldelim)
 		linelen = Blinelen(bp);
 		if(n == 0 && linelen == 0)
 			return nil;
-		nq = realloc(q, n+linelen+1);
+		nq = realloc(q, (size_t)(n+linelen+1));
 		if(nq == nil) {
 			free(q);
 			return nil;
 		}
 		q = nq;
 		if(p != nil) {
-			memmove(q+n, p, linelen);
+			memmove(q+n, p, (size_t)linelen);
 			n += linelen;
 			if(nulldelim)
 				q[n-1] = '\0';

src/libbio/bread.c

@@ -41,11 +41,11 @@ Bread(Biobuf *bp, void *ap, long count)
 	while(c > 0) {
 		n = -ic;
 		if(n > c)
-			n = c;
+			n = (int)c;
 		if(n == 0) {
 			if(bp->state != Bractive)
 				break;
-			i = read(bp->fid, bp->bbuf, bp->bsize);
+			i = (int)read(bp->fid, bp->bbuf, (size_t)bp->bsize);
 			if(i <= 0) {
 				bp->state = Bracteof;
 				if(i < 0)
@@ -55,13 +55,13 @@ Bread(Biobuf *bp, void *ap, long count)
 			bp->gbuf = bp->bbuf;
 			bp->offset += i;
 			if(i < bp->bsize) {
-				memmove(bp->ebuf-i, bp->bbuf, i);
+				memmove(bp->ebuf-i, bp->bbuf, (size_t)i);
 				bp->gbuf = bp->ebuf-i;
 			}
 			ic = -i;
 			continue;
 		}
-		memmove(p, bp->ebuf+ic, n);
+		memmove(p, bp->ebuf+ic, (size_t)n);
 		c -= n;
 		ic += n;
 		p += n;

src/libbio/bseek.c

@@ -62,9 +62,9 @@ Bseek(Biobuf *bp, vlong offset, int base)
 		 */
 		if(base == 0) {
 			d = n - Boffset(bp);
-			bufsz = bp->ebuf - bp->gbuf;
+			bufsz = (int)(bp->ebuf - bp->gbuf);
 			if(-bufsz <= d && d <= bufsz){
-				bp->icount += d;
+				bp->icount += (int)d;
 				if(d >= 0) {
 					if(bp->icount <= 0)
 						return n;

src/libbio/bwrite.c

@@ -41,11 +41,11 @@ Bwrite(Biobuf *bp, void *ap, long count)
 	while(c > 0) {
 		n = -oc;
 		if(n > c)
-			n = c;
+			n = (int)c;
 		if(n == 0) {
 			if(bp->state != Bwactive)
 				return Beof;
-			i = write(bp->fid, bp->bbuf, bp->bsize);
+			i = (int)write(bp->fid, bp->bbuf, (size_t)bp->bsize);
 			if(i != bp->bsize) {
 				bp->state = Binactive;
 				return Beof;
@@ -54,7 +54,7 @@ Bwrite(Biobuf *bp, void *ap, long count)
 			oc = -bp->bsize;
 			continue;
 		}
-		memmove(bp->ebuf+oc, p, n);
+		memmove(bp->ebuf+oc, p, (size_t)n);
 		oc += n;
 		c -= n;
 		p += n;