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 ----------------------------------------
 src/cmd/getflags/getflags.c     | 199 ------------------------------
 src/cmd/getflags/getflags.h     |  10 --
 src/cmd/getflags/mkfile         |   9 --
 4 files changed, 485 deletions(-)

(limited to 'src/cmd')

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
diff --git a/src/cmd/getflags/getflags.c b/src/cmd/getflags/getflags.c
index 781da33c..e69de29b 100644
--- a/src/cmd/getflags/getflags.c
+++ b/src/cmd/getflags/getflags.c
@@ -1,199 +0,0 @@
-/*% cyntax % && cc -go # %
- * getflags: process flags for command files
- * Usage: ifs='' eval `{getflags [-s] flagfmt [arg ...]}	# rc
- * Usage: IFS=   eval `getflags -b [-s] flagfmt [arg...]`	# Bourne shell
- *	-b means give Bourne-shell compatible output
- */
-#include <u.h>
-#include <libc.h>
-#include "getflags.h"
-
-/* predefine functions */
-void bourneprint(int, char *[]);
-void bournearg(char *);
-void rcprint(int, char *[]);
-void usmsg(char *);
-int count(int, char *);
-void rcarg(char *);
-
-void
-main(int argc, char *argv[])
-{
-	int bourne;
-	argc=getflags(argc, argv, "b");
-	if(argc<2) usage("flagfmt [arg ...]");
-	bourne=flag['b']!=0;
-	flag['b']=0;
-	if((argc=getflags(argc-1, argv+1, argv[1]))<0){
-		usmsg(argv[1]);
-		exits(0);
-	}
-	if(bourne) bourneprint(argc, argv);
-	else rcprint(argc, argv);
-	exits(0);
-}
-void
-bourneprint(int argc, char *argv[])
-{
-	register int c, i, n;
-	for(c=0;c!=NFLAG;c++) if(flag[c]){
-		print("FLAG%c=", c);		/* bug -- c could be a bad char */
-		n=count(c, argv[1]);
-		if(n==0)
-			print("1\n");
-		else{
-			print("'");
-			bournearg(flag[c][0]);
-			for(i=1;i!=n;i++){
-				print(" ");
-				bournearg(flag[c][i]);
-			}
-			print("'\n");
-		}
-	}
-	print("set --");
-	for(c=1;c!=argc;c++){
-		print(" ");
-		bournearg(argv[c+1]);
-	}
-	print("\n");
-}
-void
-bournearg(char *s)
-{
-	for(;*s;s++)
-		if(*s=='\'')
-			print("'\\''");
-		else
-			print("%c", *s);
-}
-void
-rcprint(int argc, char *argv[])
-{
-	int c, i, n;
-	for(c=0;c!=NFLAG;c++) if(flag[c]){
-		print("FLAG%c=", c);		/* bug -- c could be a bad char */
-		n=count(c, argv[1]);
-		if(n==0)
-			print("''");
-		else if(n==1)
-			rcarg(flag[c][0]);
-		else{
-			print("(");
-			rcarg(flag[c][0]);
-			for(i=1;i!=n;i++){
-				print(" ");
-				rcarg(flag[c][i]);
-			}
-			print(")");
-		}
-		print("\n");
-	}
-	print("*=");
-	if(argc==1) print("()");
-	else if(argc==2) rcarg(argv[2]);
-	else{
-		print("(");
-		rcarg(argv[2]);
-		for(c=2;c!=argc;c++){
-			print(" ");
-			rcarg(argv[c+1]);
-		}
-		print(")");
-	}
-	print("\n");
-}
-void
-usmsg(char *flagarg)
-{
-	char *s, *t, c;
-	int count, nflag=0;
-	print("echo Usage: $0'");
-	for(s=flagarg;*s;){
-		c=*s;
-		if(*s++==' ') continue;
-		if(*s==':')
-			count = strtol(s+1, &s, 10);
-		else count=0;
-		if(count==0){
-			if(nflag==0) print(" [-");
-			nflag++;
-			print("%c", c);
-		}
-		if(*s=='['){
-			int depth=1;
-			s++;
-			for(;*s!='\0' && depth>0; s++)
-				if (*s==']') depth--;
-				else if (*s=='[') depth++;
-		}
-	}
-	if(nflag) print("]");
-	for(s=flagarg;*s;){
-		c=*s;
-		if(*s++==' ') continue;
-		if(*s==':')
-			count = strtol(s+1, &s, 10);
-		else count=0;
-		if(count!=0){
-			print(" [-");
-			print("%c", c);
-			if(*s=='['){
-				int depth=1;
-				s++;
-				t=s;
-				for(;*s!='\0' && depth>0; s++)
-					if (*s==']') depth--;
-					else if (*s=='[') depth++;
-				print(" ");
-				write(1, t, s - t);
-			}
-			else
-				while(count--) print(" arg");
-			print("]");
-		}
-		else if(*s=='['){
-			int depth=1;
-			s++;
-			for(;*s!='\0' && depth>0; s++)
-				if (*s==']') depth--;
-				else if (*s=='[') depth++;
-		}
-	}
-	print("' $usage;\n");
-	print("exit 'usage'\n");
-}
-int
-count(int flag, char *flagarg)
-{
-	char *s, c;
-	int n;
-	for(s=flagarg;*s;){
-		c=*s;
-		if(*s++==' ') continue;
-		if(*s==':')
-			n = strtol(s+1, &s, 10);
-		else n=0;
-		if(*s=='['){
-			int depth=1;
-			s++;
-			for(;*s!='\0' && depth>0; s++)
-				if (*s==']') depth--;
-				else if (*s=='[') depth++;
-		}
-		if(c==flag) return n;
-	}
-	return -1;		/* never happens */
-}
-void
-rcarg(char *s)
-{
-	if(*s=='\0' || strpbrk(s, "\n \t#;&|^$=`'{}()<>?")){
-		print("\'");
-		for(;*s;s++)
-			if(*s=='\'') print("''");
-			else print("%c", *s);
-		print("\'");
-	}
-	else	print("%s", s);
-}
diff --git a/src/cmd/getflags/getflags.h b/src/cmd/getflags/getflags.h
index ca7167b2..e69de29b 100644
--- a/src/cmd/getflags/getflags.h
+++ b/src/cmd/getflags/getflags.h
@@ -1,10 +0,0 @@
-#define	NFLAG	128
-#define	NCMDLINE	512
-#define	NGETFLAGSARGV	256
-extern char **flag[NFLAG];
-extern char cmdline[NCMDLINE+1];
-extern char *cmdname;
-extern char *flagset[];
-extern char *getflagsargv[NGETFLAGSARGV+2];
-int getflags(int, char *[], char *);
-void usage(char *);
diff --git a/src/cmd/getflags/mkfile b/src/cmd/getflags/mkfile
index fab59aa5..e69de29b 100644
--- a/src/cmd/getflags/mkfile
+++ b/src/cmd/getflags/mkfile
@@ -1,9 +0,0 @@
-<$PLAN9/src/mkhdr
-
-TARG=getflags
-OFILES=\
-	getflags.$O\
-	funcgetflags.$O\
-
-<$PLAN9/src/mkone
-
-- 
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