first commit -- hello from 9p

.clang-format

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+TabWidth: 2
+IndentWidth: 2
+ContinuationIndentWidth: 2
+UseTab: Never
+AllowShortBlocksOnASingleLine: Always
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortEnumsOnASingleLine: true
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+PenaltyReturnTypeOnItsOwnLine: 255
+IndentCaseLabels: true
+SpaceBeforeParens: ControlStatements
+AlignAfterOpenBracket: AlwaysBreak
+BinPackArguments: false
+BinPackArguments: false
+PointerAlignment: Left
+BreakBeforeBraces: Attach
+SortIncludes: false
+AllowAllArgumentsOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AlignEscapedNewlines: Left
+

.gitignore

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+*.o
+xrxs

build.sh

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+#!/bin/sh
+
+clang-format -i ./*.c
+
+mk o.xrxs
+mv o.xrxs xrxs

mkfile

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+<$PLAN9/src/mkhdr
+
+SHORTLIB=9p
+
+TARG=xrxs
+
+OFILES=\
+	xrxs.$O\
+
+<$PLAN9/src/mkone

xrxs.c

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+#include <u.h>
+#include <libc.h>
+#include <fcall.h>
+#include <thread.h>
+#include <9p.h>
+#include <stdio.h>
+
+/* clang-format off */
+
+char  clca(char c) { return c >= 'A' && c <= 'Z' ? c + ('a' - 'A') : c; } /* char to lowercase */
+char  cuca(char c) { return c >= 'a' && c <= 'z' ? c - ('a' - 'A') : c; } /* char to uppercase */
+int   slen(char *s) { int i = 0; while(s[i] && s[++i]) { ; } return i; } /* string length */
+char *st__(char *s, char (*fn)(char)) { int i = 0; char c; while((c = s[i])) s[i++] = fn(c); return s; }
+char *stuc(char *s) { return st__(s, cuca); } /* string to uppercase */
+char *stlc(char *s) { return st__(s, clca); } /* string to lowercase */
+char *scpy(char *src, char *dst, int len) { int i = 0; while((dst[i] = src[i]) && i < len - 2) i++; dst[i + 1] = '\0'; return dst; } /* string copy */
+int   scmp(char *a, char *b) { int i = 0; while(a[i] == b[i]) if(!a[i++]) return 1; return 0; } /* string compare */
+char *scsw(char *s, char a, char b) { int i = 0; char c; while((c = s[i])) s[i++] = c == a ? b : c; return s; } /* string char swap */
+char *scat(char *dst, const char *src) { char *ptr = dst + slen(dst); while(*src) *ptr++ = *src++; *ptr = '\0'; return dst; } /* string cat */
+int   ssin(char *s, char *ss) { int a = 0, b = 0; while(s[a]) { if(s[a] == ss[b]) { if(!ss[b + 1]) return a - b; b++; } else b = 0; a++; } return -1; } /* string substring index */
+char *ccat(char *dst, char c) { int len = slen(dst); dst[len] = c; dst[len + 1] = '\0'; return dst; }
+
+/* clang-format on */
+
+void fsread(Req* r) {
+  static int i = 0;
+  char numReads[16];
+  i = i + 1;
+  sprintf(numReads, "%d reads\n", i);
+  readstr(r, "Hello from 9P!\n");
+  readstr(r, numReads);
+  respond(r, nil);
+}
+
+Srv fs = {
+  .read = fsread,
+};
+
+void threadmain(int argc, char** argv) {
+  Tree* tree;
+  char* mtpt = argv[1];
+
+  if (argc < 1)
+    sysfatal("supply a mountpoint");
+
+  tree = alloctree(nil, nil, DMDIR | 0555, nil);
+  fs.tree = tree;
+  fs.foreground = 1;
+  createfile(tree->root, "hello", nil, 0555, nil);
+
+  if (mtpt && access(mtpt, AEXIST) < 0 && access(mtpt, AEXIST) < 0)
+    sysfatal("mountpoint %s does not exist", mtpt);
+
+  threadpostmountsrv(&fs, nil, mtpt, MREPL | MCREATE);
+  threadexits(0);
+}