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f6227721 | 1 | #ifndef lint |
7406c10f | 2 | static char sccsid[] = "@(#)args.c 4.4 %G%"; |
f6227721 | 3 | #endif |
67c48f0a KM |
4 | |
5 | # | |
6 | /* | |
7 | * UNIX shell | |
8 | * | |
9 | * S. R. Bourne | |
10 | * Bell Telephone Laboratories | |
11 | * | |
12 | */ | |
13 | ||
14 | #include "defs.h" | |
15 | ||
16 | PROC STRING *copyargs(); | |
17 | LOCAL DOLPTR dolh; | |
18 | ||
19 | CHAR flagadr[10]; | |
20 | ||
21 | CHAR flagchar[] = { | |
b363d33e | 22 | 'x', 'n', 'v', 't', 's', 'i', 'e', 'r', 'k', 'u', 'b', 0 |
67c48f0a KM |
23 | }; |
24 | INT flagval[] = { | |
b363d33e | 25 | execpr, noexec, readpr, oneflg, stdflg, intflg, errflg, rshflg, keyflg, setflg, batchflg, 0 |
67c48f0a KM |
26 | }; |
27 | ||
28 | /* ======== option handling ======== */ | |
29 | ||
30 | ||
31 | INT options(argc,argv) | |
32 | STRING *argv; | |
33 | INT argc; | |
34 | { | |
35 | REG STRING cp; | |
36 | REG STRING *argp=argv; | |
37 | REG STRING flagc; | |
38 | STRING flagp; | |
39 | ||
40 | IF argc>1 ANDF *argp[1]=='-' | |
41 | THEN cp=argp[1]; | |
42 | flags &= ~(execpr|readpr); | |
43 | WHILE *++cp | |
44 | DO flagc=flagchar; | |
45 | ||
46 | WHILE *flagc ANDF *flagc != *cp DO flagc++ OD | |
47 | IF *cp == *flagc | |
48 | THEN flags |= flagval[flagc-flagchar]; | |
49 | ELIF *cp=='c' ANDF argc>2 ANDF comdiv==0 | |
50 | THEN comdiv=argp[2]; | |
51 | argp[1]=argp[0]; argp++; argc--; | |
52 | ELSE failed(argv[1],badopt); | |
53 | FI | |
54 | OD | |
55 | argp[1]=argp[0]; argc--; | |
56 | FI | |
57 | ||
b363d33e S |
58 | IF !(flags&batchflg) ANDF (getuid()!=geteuid() ORF getgid()!=getegid()) |
59 | THEN | |
60 | failed("sh","Permission denied"); | |
61 | FI | |
62 | ||
67c48f0a KM |
63 | /* set up $- */ |
64 | flagc=flagchar; | |
65 | flagp=flagadr; | |
66 | WHILE *flagc | |
67 | DO IF flags&flagval[flagc-flagchar] | |
68 | THEN *flagp++ = *flagc; | |
69 | FI | |
70 | flagc++; | |
71 | OD | |
72 | *flagp++=0; | |
73 | ||
74 | return(argc); | |
75 | } | |
76 | ||
77 | VOID setargs(argi) | |
78 | STRING argi[]; | |
79 | { | |
80 | /* count args */ | |
81 | REG STRING *argp=argi; | |
82 | REG INT argn=0; | |
83 | ||
84 | WHILE Rcheat(*argp++)!=ENDARGS DO argn++ OD | |
85 | ||
86 | /* free old ones unless on for loop chain */ | |
87 | freeargs(dolh); | |
88 | dolh=copyargs(argi,argn); /* sets dolv */ | |
89 | assnum(&dolladr,dolc=argn-1); | |
90 | } | |
91 | ||
92 | freeargs(blk) | |
93 | DOLPTR blk; | |
94 | { | |
95 | REG STRING *argp; | |
96 | REG DOLPTR argr=0; | |
97 | REG DOLPTR argblk; | |
98 | ||
99 | IF argblk=blk | |
100 | THEN argr = argblk->dolnxt; | |
101 | IF (--argblk->doluse)==0 | |
102 | THEN FOR argp=argblk->dolarg; Rcheat(*argp)!=ENDARGS; argp++ | |
103 | DO free(*argp) OD | |
104 | free(argblk); | |
105 | FI | |
106 | FI | |
107 | return(argr); | |
108 | } | |
109 | ||
110 | LOCAL STRING * copyargs(from, n) | |
111 | STRING from[]; | |
112 | { | |
113 | REG STRING * np=alloc(sizeof(STRING*)*n+3*BYTESPERWORD); | |
114 | REG STRING * fp=from; | |
115 | REG STRING * pp=np; | |
116 | ||
117 | np->doluse=1; /* use count */ | |
118 | np=np->dolarg; | |
119 | dolv=np; | |
120 | ||
121 | WHILE n-- | |
122 | DO *np++ = make(*fp++) OD | |
123 | *np++ = ENDARGS; | |
124 | return(pp); | |
125 | } | |
126 | ||
127 | clearup() | |
128 | { | |
129 | /* force `for' $* lists to go away */ | |
130 | WHILE argfor=freeargs(argfor) DONE | |
131 | ||
132 | /* clean up io files */ | |
133 | WHILE pop() DONE | |
134 | } | |
135 | ||
136 | DOLPTR useargs() | |
137 | { | |
138 | IF dolh | |
139 | THEN dolh->doluse++; | |
140 | dolh->dolnxt=argfor; | |
141 | return(argfor=dolh); | |
142 | ELSE return(0); | |
143 | FI | |
144 | } |