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	Commit message (Expand)	Author	Age	Files	Lines
*	4709	Kartik Agaram	2018-10-17	1	-2/+2
*	4539	Kartik Agaram	2018-09-07	1	-6/+6
*	4447	Kartik Agaram	2018-07-27	1	-2/+2
*	4239	Kartik Agaram	2018-05-08	1	-6/+6
*	4199	Kartik K. Agaram	2018-01-25	1	-20/+19
*	4161	Kartik K. Agaram	2017-12-15	1	-7/+7
*	4155	Kartik K. Agaram	2017-12-07	1	-2/+2
*	4134 - 'input' = 'ingredient'	Kartik K. Agaram	2017-12-03	1	-2/+2
*	4109	Kartik K. Agaram	2017-11-05	1	-3/+3
*	4102	Kartik K. Agaram	2017-11-01	1	-2/+2
*	3990	Kartik K. Agaram	2017-09-03	1	-1/+1
*	3927	Kartik K. Agaram	2017-06-19	1	-2/+2
*	3897 - various updates to documentation	Kartik K. Agaram	2017-05-29	1	-6/+6
*	3877	Kartik K. Agaram	2017-05-26	1	-1/+1
*	3764 - better colors for cross-links	Kartik K. Agaram	2017-03-08	1	-4/+5
*	3761	Kartik K. Agaram	2017-03-07	1	-0/+129

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<title>Mu - apps/ex8.subx</title>
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<a href='https://github.com/akkartik/mu/blob/master/apps/ex8.subx'>https://github.com/akkartik/mu/blob/master/apps/ex8.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Example reading commandline arguments: compute length of first arg.</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run:</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment">#   $ ./subx translate init.linux examples/ex8.subx -o examples/ex8</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment">#   $ ./subx run examples/ex8 abc de fghi</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># Expected result:</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment">#   $ echo $?</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment">#   3  # length of 'abc'</span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment">#</span>
<span id="L10" class="LineNr">10 </span><span class="subxComment"># At the start of a SubX program:</span>
<span id="L11" class="LineNr">11 </span><span class="subxComment">#   argc: *esp</span>
<span id="L12" class="LineNr">12 </span><span class="subxComment">#   argv[0]: *(esp+4)</span>
<span id="L13" class="LineNr">13 </span><span class="subxComment">#   argv[1]: *(esp+8)</span>
<span id="L14" class="LineNr">14 </span><span class="subxComment">#   ...</span>
<span id="L15" class="LineNr">15 </span><span class="subxComment"># Locals start from esp-4 downwards.</span>
<span id="L16" class="LineNr">16 </span>
<span id="L17" class="LineNr">17 </span>== code
<span id="L18" class="LineNr">18 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L19" class="LineNr">19 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L20" class="LineNr">20 </span><span class="subxS1Comment"># . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes</span>
<span id="L21" class="LineNr">21 </span>
<span id="L22" class="LineNr">22 </span><span class="SpecialChar">Entry</span>:
<span id="L23" class="LineNr">23 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L24" class="LineNr">24 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span classpre { line-height: 125%; }
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.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
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.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */package svc // import "github.com/getwtxt/getwtxt/svc"

import (
	"context"
	"log"
	"net"
	"net/http"
	"strings"
)

// content-type consts
const txtutf8 = "text/plain; charset=utf-8"
const htmlutf8 = "text/html; charset=utf-8"
const cssutf8 = "text/css; charset=utf-8"

// ipCtxKey is the Context value key for user IP addresses
type ipCtxKey int

const ctxKey ipCtxKey = iota

// Attaches a request's IP address to the request's context.
// If getwtxt is behind a reverse proxy, get the last entry
// in the X-Forwarded-For or X-Real-IP HTTP header as the user IP.
func newCtxUserIP(ctx context.Context, r *http.Request) context.Context {

	base := strings.Split(r.RemoteAddr, ":")
	uip := base[0]

	if _, ok := r.Header["X-Forwarded-For"]; ok {
		proxied := r.Header["X-Forwarded-For"]
		base = strings.Split(proxied[len(proxied)-1], ":")
		uip = base[0]
	}

	xRealIP := http.CanonicalHeaderKey("X-Real-IP")
	if _, ok := r.Header[xRealIP]; ok {
		proxied := r.Header[xRealIP]
		base = strings.Split(proxied[len(proxied)-1], ":")
		uip = base[0]
	}

	return context.WithValue(ctx, ctxKey, uip)
}

// Retrieves a request's IP address from the request's context
func getIPFromCtx(ctx context.Context) net.IP {

	uip, ok := ctx.Value(ctxKey).(string)
	if !ok {
		log.Printf("Couldn't retrieve IP from request\n")
	}

	return net.ParseIP(uip)
}

// Shim function to modify/pass context value to a handler
func ipMiddleware(hop http.Handler) http.Handler {

	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		ctx := newCtxUserIP(r.Context(), r)
		hop.ServeHTTP(w, r.WithContext(ctx))
	})
}

func log200(r *http.Request) {
	useragent := r.Header["User-Agent"]

	uip := getIPFromCtx(r.Context())
	log.Printf("*** %v :: 200 :: %v %v :: %v\n", uip, r.Method, r.URL, useragent)
}

func log400(w http.ResponseWriter, r *http.Request, err string) {
	uip := getIPFromCtx(r.Context())
	log.Printf("*** %v :: 400 :: %v %v :: %v\n", uip, r.Method, r.URL, err)
	http.Error(w, "400 Bad Request: "+err, http.StatusBadRequest)
}

func log404(w http.ResponseWriter, r *http.Request, err error) {
	useragent := r.Header["User-Agent"]

	uip := getIPFromCtx(r.Context())
	log.Printf("*** %v :: 404 :: %v %v :: %v :: %v\n", uip, r.Method, r.URL, useragent, err.Error())
	http.Error(w, err.Error(), http.StatusNotFound)
}

func log500(w http.ResponseWriter, r *http.Request, err error) {
	useragent := r.Header["User-Agent"]

	uip := getIPFromCtx(r.Context())
	log.Printf("*** %v :: 500 :: %v %v :: %v :: %v\n", uip, r.Method, r.URL, useragent, err.Error())
	http.Error(w, err.Error(), http.StatusInternalServerError)
}

n>/disp8 54 $ascii-length:end: 55 # return eax 56 c3/return 57 58 == data 59 60 # . . vim:nowrap:textwidth=0 </pre> </body> </html>