ref: 814c5bcd2efc3bb9139a56a1e0eae177437f4f56
dir: /lib/std/strbuf.myr/
use "alloc" use "die" use "extremum" use "slcp" use "types" use "utf" use "memops" pkg std = type strbuf = struct buf : byte[:] len : size fixed : bool ;; const mksb : (-> strbuf#) const mkbufsb : (buf : byte[:] -> strbuf#) const sbfin : (sb : strbuf# -> byte[:]) const sbfree : (sb : strbuf# -> void) const sbpeek : (sb : strbuf# -> byte[:]) const sbputc : (sb : strbuf#, v : char -> bool) const sbputs : (sb : strbuf#, v : byte[:] -> bool) const sbputb : (sb : strbuf#, v : byte -> bool) const sbtrim : (sb : strbuf#, len : size -> void) ;; const mksb = { var sb sb = zalloc() sb.buf = slalloc(1) -> sb } const mkbufsb = {buf var sb sb = zalloc() sb.buf = buf sb.fixed = true -> sb } const sbfin = {sb var sl sl = sb.buf[:sb.len] free(sb) -> sl } const sbfree = {sb if !sb.fixed slfree(sb.buf) ;; free(sb) } const sbpeek = {sb : strbuf# -> sb.buf[:sb.len] } const sbputc = {sb, v if !ensure(sb, charlen(v)) -> false ;; sb.len += encode(sb.buf[sb.len:], v) -> true } const sbputs = {sb, v var ok var len ok = ensure(sb, v.len) /* copy what we can */ len = min(sb.buf.len - sb.len, v.len) slcp(sb.buf[sb.len:sb.len + len], v[:len]) sb.len += len -> ok } const sbputb = {sb, v if !ensure(sb, 1) -> false ;; sb.buf[sb.len++] = v -> true } const sbtrim = {sb, len len = min(sb.len, len) if len < 0 sb.len -= abs(len) else sb.len = len ;; } const ensure = {sb, len if sb.fixed && sb.len + len > sb.buf.len -> false ;; while sb.buf.len < sb.len + len slgrow(&sb.buf, 2*sb.buf.len) ;; -> true }