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f6227721 SL |
1 | #ifndef lint |
2 | static char sccsid[] = "@(#)args.c 4.2 %G%"; | |
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[] = { | |
22 | 'x', 'n', 'v', 't', 's', 'i', 'e', 'r', 'k', 'u', 0 | |
23 | }; | |
24 | INT flagval[] = { | |
25 | execpr, noexec, readpr, oneflg, stdflg, intflg, errflg, rshflg, keyflg, setflg, 0 | |
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 | ||
58 | /* set up $- */ | |
59 | flagc=flagchar; | |
60 | flagp=flagadr; | |
61 | WHILE *flagc | |
62 | DO IF flags&flagval[flagc-flagchar] | |
63 | THEN *flagp++ = *flagc; | |
64 | FI | |
65 | flagc++; | |
66 | OD | |
67 | *flagp++=0; | |
68 | ||
69 | return(argc); | |
70 | } | |
71 | ||
72 | VOID setargs(argi) | |
73 | STRING argi[]; | |
74 | { | |
75 | /* count args */ | |
76 | REG STRING *argp=argi; | |
77 | REG INT argn=0; | |
78 | ||
79 | WHILE Rcheat(*argp++)!=ENDARGS DO argn++ OD | |
80 | ||
81 | /* free old ones unless on for loop chain */ | |
82 | freeargs(dolh); | |
83 | dolh=copyargs(argi,argn); /* sets dolv */ | |
84 | assnum(&dolladr,dolc=argn-1); | |
85 | } | |
86 | ||
87 | freeargs(blk) | |
88 | DOLPTR blk; | |
89 | { | |
90 | REG STRING *argp; | |
91 | REG DOLPTR argr=0; | |
92 | REG DOLPTR argblk; | |
93 | ||
94 | IF argblk=blk | |
95 | THEN argr = argblk->dolnxt; | |
96 | IF (--argblk->doluse)==0 | |
97 | THEN FOR argp=argblk->dolarg; Rcheat(*argp)!=ENDARGS; argp++ | |
98 | DO free(*argp) OD | |
99 | free(argblk); | |
100 | FI | |
101 | FI | |
102 | return(argr); | |
103 | } | |
104 | ||
105 | LOCAL STRING * copyargs(from, n) | |
106 | STRING from[]; | |
107 | { | |
108 | REG STRING * np=alloc(sizeof(STRING*)*n+3*BYTESPERWORD); | |
109 | REG STRING * fp=from; | |
110 | REG STRING * pp=np; | |
111 | ||
112 | np->doluse=1; /* use count */ | |
113 | np=np->dolarg; | |
114 | dolv=np; | |
115 | ||
116 | WHILE n-- | |
117 | DO *np++ = make(*fp++) OD | |
118 | *np++ = ENDARGS; | |
119 | return(pp); | |
120 | } | |
121 | ||
122 | clearup() | |
123 | { | |
124 | /* force `for' $* lists to go away */ | |
125 | WHILE argfor=freeargs(argfor) DONE | |
126 | ||
127 | /* clean up io files */ | |
128 | WHILE pop() DONE | |
129 | } | |
130 | ||
131 | DOLPTR useargs() | |
132 | { | |
133 | IF dolh | |
134 | THEN dolh->doluse++; | |
135 | dolh->dolnxt=argfor; | |
136 | return(argfor=dolh); | |
137 | ELSE return(0); | |
138 | FI | |
139 | } |