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/*% cyntax -DTEST % && cc -DTEST -go # %
*/
#include "rc.h"
#include "getflags.h"
#include "fns.h"
char *flagset[] = {"<flag>"};
char **flag[NFLAG];
char cmdline[NCMDLINE+1];
char *cmdname;
static char *flagarg="";
static void reverse(char**, char**);
static int scanflag(int, char*);
static void errn(char*, int);
static void errs(char*);
static void errc(int);
static int reason;
#define RESET 1
#define FEWARGS 2
#define FLAGSYN 3
#define BADFLAG 4
static int badflag;
int
getflags(int argc, char *argv[], char *flags, int stop)
{
char *s, *t;
int i, j, c, count;
flagarg = flags;
if(cmdname==0)
cmdname = argv[0];
s = cmdline;
for(i = 0;i!=argc;i++){
for(t = argv[i];*t;t++)
if(s!=&cmdline[NCMDLINE])
*s++=*t;
if(i!=argc-1 && s!=&cmdline[NCMDLINE])
*s++=' ';
}
*s='\0';
i = 1;
while(i!=argc){
if(argv[i][0]!='-' || argv[i][1]=='\0'){
if(stop)
return argc;
i++;
continue;
}
s = argv[i]+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 = FEWARGS;
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;
}
static void
reverse(char **p, char **q)
{
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(*f<'0' || '9'<*f){ reason = FLAGSYN; return -1; }
count = 0;
while('0'<=*f && *f<='9') count = count*10+*f++-'0';
}
else
count = 0;
if(*f=='['){
do{
f++;
if(*f=='\0'){ reason = FLAGSYN; return -1; }
}while(*f!=']');
f++;
}
if(c==fc)
return count;
}
reason = BADFLAG;
badflag = c;
return -1;
}
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 FEWARGS:
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 = 0;
while('0'<=*s && *s<='9') count = count*10+*s++-'0';
}
else count = 0;
if(count==0){
if(nflag==0)
errs(" [-");
nflag++;
errc(c);
}
if(*s=='['){
s++;
while(*s!=']' && *s!='\0') s++;
if(*s==']')
s++;
}
}
if(nflag)
errs("]");
for(s = flagarg;*s;){
c=*s;
if(*s++==' ')
continue;
if(*s==':'){
s++;
count = 0;
while('0'<=*s && *s<='9') count = count*10+*s++-'0';
}
else count = 0;
if(count!=0){
errs(" [-");
errc(c);
if(*s=='['){
s++;
t = s;
while(*s!=']' && *s!='\0') s++;
errs(" ");
errn(t, s-t);
if(*s==']')
s++;
}
else
while(count--) errs(" arg");
errs("]");
}
else if(*s=='['){
s++;
while(*s!=']' && *s!='\0') s++;
if(*s==']')
s++;
}
}
if(tail){
errs(" ");
errs(tail);
}
errs("\n");
Exit("bad flags");
}
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;
}
}
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