Commit | Line | Data |
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fcf77ac5 | 1 | static char sccsid[] = "@(#)apply.c 4.2 (Berkeley) %G%"; |
8123553b KM |
2 | |
3 | /*%cc -s -O % | |
4 | * apply - apply a command to a set of arguments | |
5 | * | |
6 | * apply echo * == ls | |
7 | * apply -2 cmp A1 B1 A2 B2 compares A's with B's | |
8 | * apply "ln %1 /usr/fred/dir" * duplicates a directory | |
9 | */ | |
10 | #include <stdio.h> | |
11 | char *cmdp; | |
12 | #define NCHARS 512 | |
13 | char cmd[512]; | |
14 | char defargs=1; | |
15 | #define DEFARGCHAR '%' | |
16 | char argchar=DEFARGCHAR; | |
17 | int nchars; | |
fcf77ac5 SL |
18 | extern char *getenv(); |
19 | ||
8123553b KM |
20 | main(argc, argv) |
21 | char *argv[]; | |
22 | { | |
23 | register n; | |
24 | while(argc>2 && argv[1][0]=='-'){ | |
25 | if(argv[1][1]=='a'){ | |
26 | argchar=argv[1][2]; | |
27 | if(argchar=='\0') | |
28 | argchar=DEFARGCHAR; | |
29 | } else { | |
30 | defargs = atoi(&argv[1][1]); | |
31 | if(defargs < 0) | |
32 | defargs = 1; | |
33 | } | |
34 | --argc; ++argv; | |
35 | } | |
36 | if(argc<2){ | |
37 | fprintf(stderr, "usage: apply [-14] [-a%] cmd arglist\n"); | |
38 | exit(1); | |
39 | } | |
40 | argc -= 2; | |
41 | cmdp = argv[1]; | |
42 | argv += 2; | |
43 | while(n=docmd(argc, argv)){ | |
44 | argc -= n; | |
45 | argv += n; | |
46 | } | |
47 | } | |
48 | char | |
49 | addc(c) | |
50 | char c; | |
51 | { | |
52 | if(nchars++>=NCHARS){ | |
53 | fprintf(stderr, "apply: command too long\n"); | |
54 | exit(1); | |
55 | } | |
56 | return(c); | |
57 | } | |
58 | char * | |
59 | addarg(s, t) | |
60 | register char *s, *t; | |
61 | { | |
62 | while(*t = addc(*s++)) | |
63 | *t++; | |
64 | return(t); | |
65 | } | |
66 | docmd(argc, argv) | |
67 | char *argv[]; | |
68 | { | |
69 | register char *p, *q; | |
70 | register max, i; | |
71 | char gotit; | |
72 | if(argc<=0) | |
73 | return(0); | |
74 | nchars = 0; | |
75 | max = 0; | |
76 | gotit = 0; | |
77 | p = cmdp; | |
78 | q = cmd; | |
79 | while(*q = addc(*p++)){ | |
80 | if(*q++!=argchar || *p<'1' || '9'<*p) | |
81 | continue; | |
82 | if((i= *p++-'1') > max) | |
83 | max = i; | |
84 | if(i>=argc){ | |
85 | Toofew: | |
86 | fprintf(stderr, "apply: expecting argument(s) after `%s'\n", argv[argc-1]); | |
87 | exit(1); | |
88 | } | |
89 | q = addarg(argv[i], q-1); | |
90 | gotit++; | |
91 | } | |
92 | if(defargs!=0 && gotit==0){ | |
93 | if(defargs>argc) | |
94 | goto Toofew; | |
95 | for(i=0; i<defargs; i++){ | |
96 | *q++ = addc(' '); | |
97 | q = addarg(argv[i], q); | |
98 | } | |
99 | } | |
100 | i = system(cmd); | |
101 | if(i == 127){ | |
102 | fprintf(stderr, "apply: no shell!\n"); | |
103 | exit(1); | |
104 | } | |
105 | return(max==0? (defargs==0? 1 : defargs) : max+1); | |
106 | } | |
107 | system(s) | |
108 | char *s; | |
109 | { | |
110 | int status, pid, w; | |
111 | char *shell = getenv("SHELL"); | |
112 | ||
113 | if ((pid = fork()) == 0) { | |
114 | execl(shell ? shell : "/bin/sh", "sh", "-c", s, 0); | |
115 | _exit(127); | |
116 | } | |
117 | if(pid == -1){ | |
118 | fprintf(stderr, "apply: can't fork\n"); | |
119 | exit(1); | |
120 | } | |
121 | while ((w = wait(&status)) != pid && w != -1) | |
122 | ; | |
123 | if (w == -1) | |
124 | status = -1; | |
125 | return(status); | |
126 | } |