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