lib: rename stdlib surface to Hare names; add endian/math

Sweeping rename so the lib/ surface mirrors Hare's stdlib spellings.
- ascii: rune-taking predicates; ishex -> isxdigit
- bufio: rinit -> init; take1/takeline -> readbyte/readline
- bytes: indexsub -> index
- encoding/utf8: runelen -> runesz
- errors: eEOF/eShortRead/... -> eof/underread/...
- fmt: errln -> errorln; println/fprintln return i64
- os: readfull/writefull -> readall/writeall; unlink -> remove
- path: isabs -> abs; drop lastindex (now strings.rbyteindex)
- strconv: u64toa/i64toa -> u64tos/i64tos; parse64/parseu64 -> stoi64/stou64
- strings: drop len/isempty; equal -> compare; indexbyte -> byteindex; +rbyteindex
- types: drop numeric helpers (moved to math)
- new lib/endian (htonu16/ntohu16), lib/math (absi32/absi64)
- net: drop htons (use endian.htonu16)

Callers in selfhost/, lib/ww/, cmd/w6c/cgen.c, and test/wcc/700_e2e.c
updated to match.

selfhost/cmd/w6l/dyn.ww

@@ -123,13 +123,13 @@ fn dbasename(p: *u8) *u8 = {
 
 // ---- file slurp --------------------------------------------------------
 
-fn readallso(path: *u8) (*u8, u64) = {
+fn slurpso(path: *u8) (*u8, u64) = {
 	let fd: i32 = os.open(path, os.O_RDONLY, 0i32);
 	if (fd < 0) { return nil, 0u64; };
 	let n: i64 = os.filesize(fd);
 	if (n < 0i64) { os.close(fd); return nil, 0u64; };
 	let buf: *u8 = os.alloc(n: u64): *u8;
-	let got: i64 = os.readfull(fd, buf, n: u64);
+	let got: i64 = os.readall(fd, buf, n: u64);
 	os.close(fd);
 	if (got != n) { return nil, 0u64; };
 	return buf, n: u64;
@@ -165,7 +165,7 @@ fn vdnameat(buf: *u8, verdefoff: u64, verdefsize: u64,
 export fn loadso(l: *lnk, path: *u8) i32 = {
 	let buf: *u8;
 	let blen: u64;
-	buf, blen = readallso(path);
+	buf, blen = slurpso(path);
 	if (buf == nil) {
 		os.write(2, "w6l: cannot read .so\n".ptr, 20u64);
 		return -1;

selfhost/cmd/w6l/dynout.ww

@@ -720,7 +720,7 @@ export fn emitdynelf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	dbcopy(filebuf, gotpltoff, gotpltbuf, gotpltsz);
 	dbcopy(filebuf, dynamicoff, dynamicbuf, dynamicsz);
 
-	let wrote: i64 = os.writefull(fd, filebuf, fileend);
+	let wrote: i64 = os.writeall(fd, filebuf, fileend);
 	if (wrote != fileend: i64) {
 		return 1;
 	};

selfhost/cmd/w6l/main.combined.ww

@@ -120,9 +120,11 @@ export fn filesize(fd: i32) i64 = {
 	return end;
 };
 
-// readfull — keep reading until `n` bytes have arrived or the fd
+// readall — keep reading until `n` bytes have arrived or the fd
 // closes early. Returns bytes read (0..=n) or -1 on read error.
-export fn readfull(fd: i32, buf: *u8, n: u64) i64 = {
+// Hare name (io::readall); the buffer is caller-supplied, matching
+// the Plan 9 subset convention.
+export fn readall(fd: i32, buf: *u8, n: u64) i64 = {
 	let got: u64 = 0u64;
 	for (got < n) {
 		let r: i64 = read(fd, buf + got, n - got);
@@ -133,9 +135,10 @@ export fn readfull(fd: i32, buf: *u8, n: u64) i64 = {
 	return got: i64;
 };
 
-// writefull — keep writing until `n` bytes have been accepted or the
-// fd refuses progress. Returns bytes written or -1.
-export fn writefull(fd: i32, buf: *u8, n: u64) i64 = {
+// writeall — keep writing until `n` bytes have been accepted or the
+// fd refuses progress. Returns bytes written or -1. Hare name
+// (io::writeall).
+export fn writeall(fd: i32, buf: *u8, n: u64) i64 = {
 	let sent: u64 = 0u64;
 	for (sent < n) {
 		let r: i64 = write(fd, buf + sent, n - sent);
@@ -154,8 +157,8 @@ export fn access(path: *u8, mode: i32) i32 = {
 	return syscall2(SYS_ACCESS, path: i64, mode: i64): i32;
 };
 
-// unlink(2).
-export fn unlink(path: *u8) i32 = {
+// remove — unlink(2). Hare name; the underlying syscall is unlink(2).
+export fn remove(path: *u8) i32 = {
 	return syscall1(SYS_UNLINK, path: i64): i32;
 };
 
@@ -497,13 +500,13 @@ def RELA_ADDEND:   u64 = 16u64;
 
 // ---- file slurp --------------------------------------------------------
 
-fn readall(path: *u8) (*u8, u64) = {
+fn slurp(path: *u8) (*u8, u64) = {
 	let fd: i32 = os.open(path, os.O_RDONLY, 0i32);
 	if (fd < 0) { return nil, 0u64; };
 	let n: i64 = os.filesize(fd);
 	if (n < 0i64) { os.close(fd); return nil, 0u64; };
 	let buf: *u8 = os.alloc(n: u64): *u8;
-	let got: i64 = os.readfull(fd, buf, n: u64);
+	let got: i64 = os.readall(fd, buf, n: u64);
 	os.close(fd);
 	if (got != n) { return nil, 0u64; };
 	return buf, n: u64;
@@ -756,7 +759,7 @@ fn loadarchive(l: *lnk, path: *u8, buf: *u8, len: u64) i32 = {
 export fn load(l: *lnk, path: *u8) i32 = {
 	let bufp: *u8;
 	let buflen: u64;
-	bufp, buflen = readall(path);
+	bufp, buflen = slurp(path);
 	if (bufp == nil) {
 		os.write(2, "w6l: cannot read object\n".ptr, 23u64);
 		return -1;
@@ -1033,13 +1036,13 @@ fn dbasename(p: *u8) *u8 = {
 
 // ---- file slurp --------------------------------------------------------
 
-fn readallso(path: *u8) (*u8, u64) = {
+fn slurpso(path: *u8) (*u8, u64) = {
 	let fd: i32 = os.open(path, os.O_RDONLY, 0i32);
 	if (fd < 0) { return nil, 0u64; };
 	let n: i64 = os.filesize(fd);
 	if (n < 0i64) { os.close(fd); return nil, 0u64; };
 	let buf: *u8 = os.alloc(n: u64): *u8;
-	let got: i64 = os.readfull(fd, buf, n: u64);
+	let got: i64 = os.readall(fd, buf, n: u64);
 	os.close(fd);
 	if (got != n) { return nil, 0u64; };
 	return buf, n: u64;
@@ -1075,7 +1078,7 @@ fn vdnameat(buf: *u8, verdefoff: u64, verdefsize: u64,
 export fn loadso(l: *lnk, path: *u8) i32 = {
 	let buf: *u8;
 	let blen: u64;
-	buf, blen = readallso(path);
+	buf, blen = slurpso(path);
 	if (buf == nil) {
 		os.write(2, "w6l: cannot read .so\n".ptr, 20u64);
 		return -1;
@@ -2146,7 +2149,7 @@ export fn emitdynelf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	dbcopy(filebuf, gotpltoff, gotpltbuf, gotpltsz);
 	dbcopy(filebuf, dynamicoff, dynamicbuf, dynamicsz);
 
-	let wrote: i64 = os.writefull(fd, filebuf, fileend);
+	let wrote: i64 = os.writeall(fd, filebuf, fileend);
 	if (wrote != fileend: i64) {
 		return 1;
 	};
@@ -2246,10 +2249,10 @@ export fn emitelf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	wru64(hdr, 112u64, TEXT_OFF);		// p_align
 
 	// Write [0..0x1000) then .text.
-	let n1: i64 = os.writefull(fd, hdr, TEXT_OFF);
+	let n1: i64 = os.writeall(fd, hdr, TEXT_OFF);
 	if (n1 != TEXT_OFF: i64) { return -1; };
 	if (l.textlen > 0u64) {
-		let n2: i64 = os.writefull(fd, l.text, l.textlen);
+		let n2: i64 = os.writeall(fd, l.text, l.textlen);
 		if (n2 != l.textlen: i64) { return -1; };
 	};
 	return 0;

selfhost/cmd/w6l/obj.ww

@@ -75,13 +75,13 @@ def RELA_ADDEND:   u64 = 16u64;
 
 // ---- file slurp --------------------------------------------------------
 
-fn readall(path: *u8) (*u8, u64) = {
+fn slurp(path: *u8) (*u8, u64) = {
 	let fd: i32 = os.open(path, os.O_RDONLY, 0i32);
 	if (fd < 0) { return nil, 0u64; };
 	let n: i64 = os.filesize(fd);
 	if (n < 0i64) { os.close(fd); return nil, 0u64; };
 	let buf: *u8 = os.alloc(n: u64): *u8;
-	let got: i64 = os.readfull(fd, buf, n: u64);
+	let got: i64 = os.readall(fd, buf, n: u64);
 	os.close(fd);
 	if (got != n) { return nil, 0u64; };
 	return buf, n: u64;
@@ -334,7 +334,7 @@ fn loadarchive(l: *lnk, path: *u8, buf: *u8, len: u64) i32 = {
 export fn load(l: *lnk, path: *u8) i32 = {
 	let bufp: *u8;
 	let buflen: u64;
-	bufp, buflen = readall(path);
+	bufp, buflen = slurp(path);
 	if (bufp == nil) {
 		os.write(2, "w6l: cannot read object\n".ptr, 23u64);
 		return -1;

selfhost/cmd/w6l/out.ww

@@ -90,10 +90,10 @@ export fn emitelf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	wru64(hdr, 112u64, TEXT_OFF);		// p_align
 
 	// Write [0..0x1000) then .text.
-	let n1: i64 = os.writefull(fd, hdr, TEXT_OFF);
+	let n1: i64 = os.writeall(fd, hdr, TEXT_OFF);
 	if (n1 != TEXT_OFF: i64) { return -1; };
 	if (l.textlen > 0u64) {
-		let n2: i64 = os.writefull(fd, l.text, l.textlen);
+		let n2: i64 = os.writeall(fd, l.text, l.textlen);
 		if (n2 != l.textlen: i64) { return -1; };
 	};
 	return 0;