From 3cd77ae67905c839ba2078e119f981d4f2284c7a Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Wed, 15 Jul 2009 02:48:37 -0400
Subject: getflags: import from 4e, with usage

fixes #6 http://bitbucket.org/rsc/plan9port/issue/6/

http://codereview.appspot.com/95043
---
 src/cmd/getflags/funcgetflags.c | 267 ----------------------------------------
 1 file changed, 267 deletions(-)

(limited to 'src/cmd/getflags/funcgetflags.c')

diff --git a/src/cmd/getflags/funcgetflags.c b/src/cmd/getflags/funcgetflags.c
index d0686679..e69de29b 100644
--- a/src/cmd/getflags/funcgetflags.c
+++ b/src/cmd/getflags/funcgetflags.c
@@ -1,267 +0,0 @@
-#include <u.h>
-#include <libc.h>
-#include <ctype.h>
-#include "getflags.h"
-
-char **flag[NFLAG];
-char cmdline[NCMDLINE+1];
-char *cmdname;
-char *flagset[];
-char *flagset[]={"<flag>"};
-static char *flagarg="";
-static void reverse(char **, char **);
-static int scanflag(int, char *);
-static int reason;
-#define	RESET	1
-#define	ARGCCOUNT	2
-#define	FLAGSYN	3
-#define	BADFLAG	4
-static int badflag;
-char *getflagsargv[NGETFLAGSARGV+2];	/* original argv stored here for people who need it */
-
-int
-getflags(int argc, char *argv[], char *flags)
-{
-	char *s, *t;
-	int i, j, c, count;
-	flagarg=flags;
-	if(cmdname==0){
-		cmdname=argv[0];
-		for(i=0;i!=argc && i!=NGETFLAGSARGV;i++) getflagsargv[i]=argv[i];
-		if(argc>NGETFLAGSARGV) getflagsargv[i++]="...";
-		getflagsargv[i]=0;
-	}
-	s=cmdline;
-	for(i=0;i!=argc;i++){
-		for(t=argv[i];*t;)
-			if(s!=&cmdline[NCMDLINE])
-				*s++=*t++;
-			else
-				break;
-		if(i!=argc-1 && s!=&cmdline[NCMDLINE])
-			*s++=' ';
-	}
-	*s='\0';
-	i=1;
-	while(i!=argc && argv[i][0]=='-'){
-		s=argv[i]+1;
-		if(*s=='\0'){	/* if argument is "-", stop scanning and delete it */
-			for(j=i+1;j<=argc;j++)
-				argv[j-1]=argv[j];
-			return argc-1;
-		}
-		while(*s){
-			c=*s++;
-			count=scanflag(c, flags);
-			if(count==-1) return -1;
-			if(flag[c]){ reason=RESET; badflag=c; return -1; }
-			if(count==0){
-				flag[c]=flagset;
-				if(*s=='\0'){
-					for(j=i+1;j<=argc;j++)
-						argv[j-1]=argv[j];
-					--argc;
-				}
-			}
-			else{
-				if(*s=='\0'){
-					for(j=i+1;j<=argc;j++)
-						argv[j-1]=argv[j];
-					--argc;
-					s=argv[i];
-				}
-				if(argc-i<count){
-					reason=ARGCCOUNT;
-					badflag=c;
-					return -1;
-				}
-				reverse(argv+i, argv+argc);
-				reverse(argv+i, argv+argc-count);
-				reverse(argv+argc-count+1, argv+argc);
-				argc-=count;
-				flag[c]=argv+argc+1;
-				flag[c][0]=s;
-				s="";
-			}
-		}
-	}
-	return argc;
-}
-
-void
-static reverse(char **p, char **q)
-{
-	register char *t;
-	for(;p<q;p++,--q){ t=*p; *p=*q; *q=t; }
-}
-
-static int
-scanflag(int c, char *f)
-{
-	int fc, count;
-	if(0<=c && c<NFLAG) while(*f){
-		if(*f==' '){
-			f++;
-			continue;
-		}
-		fc=*f++;
-		if(*f==':'){
-			f++;
-			if(!isdigit((uchar)*f)){ reason=FLAGSYN; return -1; }
-			count=strtol(f, &f, 10);
-		}
-		else
-			count=0;
-		if(*f=='['){
-			int depth=1;
-			do{
-				f++;
-				if(*f=='\0'){ reason=FLAGSYN; return -1; }
-				if(*f=='[') depth++;
-				if(*f==']') depth--;
-			}while(depth>0);
-			f++;
-		}
-		if(c==fc) return count;
-	}
-	reason=BADFLAG;
-	badflag=c;
-	return -1;
-}
-
-static void errn(char *, int), errs(char *), errc(int);
-
-void
-usage(char *tail)
-{
-	char *s, *t, c;
-	int count, nflag=0;
-	switch(reason){
-	case RESET:
-		errs("Flag -");
-		errc(badflag);
-		errs(": set twice\n");
-		break;
-	case ARGCCOUNT:
-		errs("Flag -");
-		errc(badflag);
-		errs(": too few arguments\n");
-		break;
-	case FLAGSYN:
-		errs("Bad argument to getflags!\n");
-		break;
-	case BADFLAG:
-		errs("Illegal flag -");
-		errc(badflag);
-		errc('\n');
-		break;
-	}
-	errs("Usage: ");
-	errs(cmdname);
-	for(s=flagarg;*s;){
-		c=*s;
-		if(*s++==' ') continue;
-		if(*s==':'){
-			s++;
-			count=strtol(s, &s, 10);
-		}
-		else count=0;
-		if(count==0){
-			if(nflag==0) errs(" [-");
-			nflag++;
-			errc(c);
-		}
-		if(*s=='['){
-			int depth=1;
-			s++;
-			for(;*s!='\0' && depth>0; s++)
-				if (*s==']') depth--;
-				else if (*s=='[') depth++;
-		}
-	}
-	if(nflag) errs("]");
-	for(s=flagarg;*s;){
-		c=*s;
-		if(*s++==' ') continue;
-		if(*s==':'){
-			s++;
-			count=strtol(s, &s, 10);
-		}
-		else count=0;
-		if(count!=0){
-			errs(" [-");
-			errc(c);
-			if(*s=='['){
-				int depth=1;
-				s++;
-				t=s;
-				for(;*s!='\0' && depth>0; s++)
-					if (*s==']') depth--;
-					else if (*s=='[') depth++;
-				errs(" ");
-				errn(t, s-t);
-			}
-			else
-				while(count--) errs(" arg");
-			errs("]");
-		}
-		else if(*s=='['){
-			int depth=1;
-			s++;
-			for(;*s!='\0' && depth>0; s++)
-				if (*s==']') depth--;
-				else if (*s=='[') depth++;
-		}
-	}
-	if(tail){
-		errs(" ");
-		errs(tail);
-	}
-	errs("\n");
-	exits("usage");
-}
-
-static void
-errn(char *s, int count)
-{
-	while(count){ errc(*s++); --count; }
-}
-
-static void
-errs(char *s)
-{
-	while(*s) errc(*s++);
-}
-
-#define	NBUF	80
-static char buf[NBUF], *bufp=buf;
-
-static void
-errc(int c){
-	*bufp++=c;
-	if(bufp==&buf[NBUF] || c=='\n'){
-		write(2, buf, bufp-buf);
-		bufp=buf;
-	}
-}
-
-#ifdef TEST
-#include <stdio.h>
-main(int argc, char *argv[])
-{
-	int c, i, n;
-	if(argc<3){
-		fprint(2, "Usage: %s flags cmd ...\n", argv[0]);
-		exits("usage");
-	}
-	n=getflags(argc-2, argv+2, argv[1]);
-	if(n<0) usage("...");
-	putchar('\n');
-	for(c=0;c!=128;c++) if(flag[c]){
-		print("\t-.%c. ", c);
-		n=scanflag(c, argv[1]);
-		for(i=0;i!=n;i++) print(" <%s>", flag[c][i]);
-		putchar('\n');
-	}
-}
-#endif
-- 
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