ref: 606901dc5da9cb09acb5593c5cf74ce1b52ca6e2
dir: /utils/rcsh/glob.c/
#include "rc.h"
char *globname;
Word *globv;
int matchfn(char *s, char *p);
int globsize(char *p);
/*
* delete all the GLOB marks from s, in place
*/
void
deglob(char *s)
{
char *t=s;
do{
if(*t==GLOB) t++;
*s++=*t;
}while(*t++);
}
int
globcmp(void *s, void *t)
{
return strcmp(*(char**)s, *(char**)t);
}
void
globsort(Word *left, Word *right)
{
char **list;
Word *a;
int n=0;
for(a=left;a!=right;a=a->next) n++;
list=(char **)malloc(n*sizeof(char *));
for(a=left,n=0;a!=right;a=a->next,n++) list[n]=a->word;
qsort((void*)list, (size_t)n, sizeof(char*), globcmp);
for(a=left,n=0;a!=right;a=a->next,n++) a->word=list[n];
free(list);
}
/*
* Push names prefixed by globname and suffixed by a match of p onto the astack.
* namep points to the end of the prefix in globname.
*/
void
globdir(char *p, char *namep)
{
char *t, *q, *newp;
Direntry *dp, *dq;
Dir *dir;
/* scan the pattern looking for a component with a metacharacter in it */
if(*p=='\0'){
globv=newword(globname, globv);
return;
}
t=namep;
newp=p;
while(*newp){
if(*newp==GLOB)
break;
*t=*newp++;
if(*t++=='/'){
namep=t;
p=newp;
}
}
/* If we ran out of pattern, append the name if accessible */
if(*newp=='\0'){
*t='\0';
if(access(globname, 0)==0)
globv=newword(globname, globv);
return;
}
/* read the directory and recur for any entry that matches */
*namep='\0';
t = globname;
if(*t == 0)
t = ".";
q = strdup(t);
if (q[strlen(q)-1] == '/')
q[strlen(q)-1] = 0;
if((dir=dirstat(q)) == nil || !(dir->mode&0x80000000)){
free(dir);
return;
}
free(dir);
dq = readdirect(q);
if(dq == 0){
fprint(2, "could not open %s: %r\n", q);
return;
}
while(*newp!='/' && *newp!='\0')
newp++;
for(dp = dq;dp->name; dp++){
strcpy(namep, dp->name);
if(matchfn(namep, p))
globdir(newp, namep+strlen(namep));
free(dp->name);
}
free(dq);
}
/*
* Push all file names matched by p on the current thread's stack.
* If there are no matches, the list consists of p.
*/
void
glob(char *p)
{
Word *svglobv=globv;
int globlen=globsize(p);
if(globlen == 0){
deglob(p);
globv=newword(p, globv);
return;
}
globname=malloc(globlen);
globname[0]='\0';
globdir(p, globname);
free(globname);
if(svglobv==globv){
deglob(p);
globv=newword(p, globv);
}
else
globsort(globv, svglobv);
}
/*
* Do p and q point at equal utf codes
*/
int
equtf(char *p, char *q)
{
if(*p!=*q)
return 0;
if(twobyte(*p)) return p[1]==q[1];
if(threebyte(*p)){
if(p[1]!=q[1]) return 0;
if(p[1]=='\0') return 1; /* broken code at end of string! */
return p[2]==q[2];
}
return 1;
}
/*
* Return a pointer to the next utf code in the string,
* not jumping past nuls in broken utf codes!
*/
char *
nextutf(char *p)
{
if(twobyte(*p))
return p[1]=='\0'?p+1:p+2;
if(threebyte(*p))
return p[1]=='\0'?p+1:p[2]=='\0'?p+2:p+3;
return p+1;
}
/*
* Convert the utf code at *p to a unicode value
*/
int
unicode(char *p)
{
int u=*p&0xff;
if(twobyte(u))
return ((u&0x1f)<<6)|(p[1]&0x3f);
if(threebyte(u))
return (u<<12)|((p[1]&0x3f)<<6)|(p[2]&0x3f);
return u;
}
/*
* Does the string s match the pattern p
* . and .. are only matched by patterns starting with .
* * matches any sequence of characters
* ? matches any single character
* [...] matches the enclosed list of characters
*/
int
matchfn(char *s, char *p)
{
if(s[0]=='.' && (s[1]=='\0' || s[1]=='.' && s[2]=='\0') && p[0]!='.')
return 0;
return match(s, p, '/');
}
int
match(char *s, char *p, int stop)
{
int compl, hit, lo, hi, t, c;
for(;*p!=stop && *p!='\0';s=nextutf(s),p=nextutf(p)) {
if(*p!=GLOB){
if(!equtf(p, s)) return 0;
}
else switch(*++p){
case GLOB:
if(*s!=GLOB) return 0;
break;
case '*':
for(;;){
if(match(s, nextutf(p), stop)) return 1;
if(!*s) break;
s=nextutf(s);
}
return 0;
case '?':
if(*s=='\0') return 0;
break;
case '[':
if(*s=='\0') return 0;
c=unicode(s);
p++;
compl=*p=='~';
if(compl) p++;
hit=0;
while(*p!=']'){
if(*p=='\0') return 0; /* syntax error */
lo=unicode(p);
p=nextutf(p);
if(*p!='-') hi=lo;
else{
p++;
if(*p=='\0') return 0; /* syntax error */
hi=unicode(p);
p=nextutf(p);
if(hi<lo){ t=lo; lo=hi; hi=t; }
}
if(lo<=c && c<=hi) hit=1;
}
if(compl) hit=!hit;
if(!hit) return 0;
break;
}
}
return *s=='\0';
}
void
globlist1(Word *gl)
{
if(gl){
globlist1(gl->next);
glob(gl->word);
}
}
void
globlist(void)
{
Word *a;
globv=0;
globlist1(runq->argv->words);
poplist();
pushlist();
if(globv){
for(a=globv;a->next;a=a->next);
a->next=runq->argv->words;
runq->argv->words=globv;
}
}
#define NDIR 128
int
globsize(char *p)
{
ulong isglob=0, globlen=NDIR+1;
for(;*p;p++){
if(*p==GLOB){
p++;
if(*p!=GLOB) isglob++;
globlen+=*p=='*'?NDIR:1;
}
else
globlen++;
}
return isglob?globlen:0;
}