| 1 | /* expand.c 4.1 82/05/07 */ |
| 2 | |
| 3 | # |
| 4 | /* |
| 5 | * UNIX shell |
| 6 | * |
| 7 | * S. R. Bourne |
| 8 | * Bell Telephone Laboratories |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include "defs.h" |
| 13 | #include <sys/param.h> |
| 14 | #include <sys/stat.h> |
| 15 | #include <dir.h> |
| 16 | |
| 17 | |
| 18 | |
| 19 | /* globals (file name generation) |
| 20 | * |
| 21 | * "*" in params matches r.e ".*" |
| 22 | * "?" in params matches r.e. "." |
| 23 | * "[...]" in params matches character class |
| 24 | * "[...a-z...]" in params matches a through z. |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | PROC VOID addg(); |
| 29 | |
| 30 | |
| 31 | INT expand(as,rflg) |
| 32 | STRING as; |
| 33 | { |
| 34 | INT count; |
| 35 | DIR *dirf; |
| 36 | BOOL dir=0; |
| 37 | STRING rescan = 0; |
| 38 | REG STRING s, cs; |
| 39 | ARGPTR schain = gchain; |
| 40 | struct direct *dp; |
| 41 | STATBUF statb; |
| 42 | |
| 43 | IF trapnote&SIGSET THEN return(0); FI |
| 44 | |
| 45 | s=cs=as; |
| 46 | |
| 47 | /* check for meta chars */ |
| 48 | BEGIN |
| 49 | REG BOOL slash; slash=0; |
| 50 | WHILE !fngchar(*cs) |
| 51 | DO IF *cs++==0 |
| 52 | THEN IF rflg ANDF slash THEN break; ELSE return(0) FI |
| 53 | ELIF *cs=='/' |
| 54 | THEN slash++; |
| 55 | FI |
| 56 | OD |
| 57 | END |
| 58 | |
| 59 | LOOP IF cs==s |
| 60 | THEN s=nullstr; |
| 61 | break; |
| 62 | ELIF *--cs == '/' |
| 63 | THEN *cs=0; |
| 64 | IF s==cs THEN s="/" FI |
| 65 | break; |
| 66 | FI |
| 67 | POOL |
| 68 | IF stat(s,&statb)>=0 |
| 69 | ANDF (statb.st_mode&S_IFMT)==S_IFDIR |
| 70 | ANDF (dirf=opendir(s))>0 |
| 71 | THEN dir++; |
| 72 | FI |
| 73 | count=0; |
| 74 | IF *cs==0 THEN *cs++=0200 FI |
| 75 | IF dir |
| 76 | THEN /* check for rescan */ |
| 77 | REG STRING rs; rs=cs; |
| 78 | |
| 79 | REP IF *rs=='/' THEN rescan=rs; *rs=0; gchain=0 FI |
| 80 | PER *rs++ DONE |
| 81 | |
| 82 | WHILE (dp = readdir(dirf)) != NULL ANDF (trapnote&SIGSET) == 0 |
| 83 | DO IF (*dp->d_name=='.' ANDF *cs!='.') |
| 84 | THEN continue; |
| 85 | FI |
| 86 | IF gmatch(dp->d_name, cs) |
| 87 | THEN addg(s,dp->d_name,rescan); count++; |
| 88 | FI |
| 89 | OD |
| 90 | closedir(dirf); |
| 91 | |
| 92 | IF rescan |
| 93 | THEN REG ARGPTR rchain; |
| 94 | rchain=gchain; gchain=schain; |
| 95 | IF count |
| 96 | THEN count=0; |
| 97 | WHILE rchain |
| 98 | DO count += expand(rchain->argval,1); |
| 99 | rchain=rchain->argnxt; |
| 100 | OD |
| 101 | FI |
| 102 | *rescan='/'; |
| 103 | FI |
| 104 | FI |
| 105 | |
| 106 | BEGIN |
| 107 | REG CHAR c; |
| 108 | s=as; |
| 109 | WHILE c = *s |
| 110 | DO *s++=(c&STRIP?c:'/') OD |
| 111 | END |
| 112 | return(count); |
| 113 | } |
| 114 | |
| 115 | gmatch(s, p) |
| 116 | REG STRING s, p; |
| 117 | { |
| 118 | REG INT scc; |
| 119 | CHAR c; |
| 120 | |
| 121 | IF scc = *s++ |
| 122 | THEN IF (scc &= STRIP)==0 |
| 123 | THEN scc=0200; |
| 124 | FI |
| 125 | FI |
| 126 | SWITCH c = *p++ IN |
| 127 | |
| 128 | case '[': |
| 129 | {BOOL ok; INT lc; |
| 130 | ok=0; lc=077777; |
| 131 | WHILE c = *p++ |
| 132 | DO IF c==']' |
| 133 | THEN return(ok?gmatch(s,p):0); |
| 134 | ELIF c==MINUS |
| 135 | THEN IF lc<=scc ANDF scc<=(*p++) THEN ok++ FI |
| 136 | ELSE IF scc==(lc=(c&STRIP)) THEN ok++ FI |
| 137 | FI |
| 138 | OD |
| 139 | return(0); |
| 140 | } |
| 141 | |
| 142 | default: |
| 143 | IF (c&STRIP)!=scc THEN return(0) FI |
| 144 | |
| 145 | case '?': |
| 146 | return(scc?gmatch(s,p):0); |
| 147 | |
| 148 | case '*': |
| 149 | IF *p==0 THEN return(1) FI |
| 150 | --s; |
| 151 | WHILE *s |
| 152 | DO IF gmatch(s++,p) THEN return(1) FI OD |
| 153 | return(0); |
| 154 | |
| 155 | case 0: |
| 156 | return(scc==0); |
| 157 | ENDSW |
| 158 | } |
| 159 | |
| 160 | LOCAL VOID addg(as1,as2,as3) |
| 161 | STRING as1, as2, as3; |
| 162 | { |
| 163 | REG STRING s1, s2; |
| 164 | REG INT c; |
| 165 | |
| 166 | s2 = locstak()+BYTESPERWORD; |
| 167 | |
| 168 | s1=as1; |
| 169 | WHILE c = *s1++ |
| 170 | DO IF (c &= STRIP)==0 |
| 171 | THEN *s2++='/'; |
| 172 | break; |
| 173 | FI |
| 174 | *s2++=c; |
| 175 | OD |
| 176 | s1=as2; |
| 177 | WHILE *s2 = *s1++ DO s2++ OD |
| 178 | IF s1=as3 |
| 179 | THEN *s2++='/'; |
| 180 | WHILE *s2++ = *++s1 DONE |
| 181 | FI |
| 182 | makearg(endstak(s2)); |
| 183 | } |
| 184 | |
| 185 | makearg(args) |
| 186 | REG STRING args; |
| 187 | { |
| 188 | args->argnxt=gchain; |
| 189 | gchain=args; |
| 190 | } |
| 191 | |