4.3BSD - /usr/src/ucb/apply.c

   1: /*
   2:  * Copyright (c) 1983 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: char copyright[] =
   9: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
  10:  All rights reserved.\n";
  11: #endif not lint
  12: 
  13: #ifndef lint
  14: static char sccsid[] = "@(#)apply.c	5.1 (Berkeley) 5/31/85";
  15: #endif not lint
  16: 
  17: /*%cc -s -O %
  18:  * apply - apply a command to a set of arguments
  19:  *
  20:  *	apply echo * == ls
  21:  *	apply -2 cmp A1 B1 A2 B2   compares A's with B's
  22:  *	apply "ln %1 /usr/fred/dir" *  duplicates a directory
  23:  */
  24: #include <stdio.h>
  25: char    *cmdp;
  26: #define NCHARS 512
  27: char    cmd[512];
  28: char    defargs=1;
  29: #define DEFARGCHAR  '%'
  30: char    argchar=DEFARGCHAR;
  31: int nchars;
  32: extern  char *getenv();
  33: 
  34: main(argc, argv)
  35:     char *argv[];
  36: {
  37:     register n;
  38:     while(argc>2 && argv[1][0]=='-'){
  39:         if(argv[1][1]=='a'){
  40:             argchar=argv[1][2];
  41:             if(argchar=='\0')
  42:                 argchar=DEFARGCHAR;
  43:         } else {
  44:             defargs = atoi(&argv[1][1]);
  45:             if(defargs < 0)
  46:                 defargs = 1;
  47:         }
  48:         --argc; ++argv;
  49:     }
  50:     if(argc<2){
  51:         fprintf(stderr, "usage: apply [-14] [-a%] cmd arglist\n");
  52:         exit(1);
  53:     }
  54:     argc -= 2;
  55:     cmdp = argv[1];
  56:     argv += 2;
  57:     while(n=docmd(argc, argv)){
  58:         argc -= n;
  59:         argv += n;
  60:     }
  61: }
  62: char
  63: addc(c)
  64:     char c;
  65: {
  66:     if(nchars++>=NCHARS){
  67:         fprintf(stderr, "apply: command too long\n");
  68:         exit(1);
  69:     }
  70:     return(c);
  71: }
  72: char *
  73: addarg(s, t)
  74:     register char *s, *t;
  75: {
  76:     while(*t = addc(*s++))
  77:         *t++;
  78:     return(t);
  79: }
  80: docmd(argc, argv)
  81:     char *argv[];
  82: {
  83:     register char *p, *q;
  84:     register max, i;
  85:     char gotit;
  86:     if(argc<=0)
  87:         return(0);
  88:     nchars = 0;
  89:     max = 0;
  90:     gotit = 0;
  91:     p = cmdp;
  92:     q = cmd;
  93:     while(*q = addc(*p++)){
  94:         if(*q++!=argchar || *p<'1' || '9'<*p)
  95:             continue;
  96:         if((i= *p++-'1') > max)
  97:             max = i;
  98:         if(i>=argc){
  99:     Toofew:
 100:             fprintf(stderr, "apply: expecting argument(s) after `%s'\n", argv[argc-1]);
 101:             exit(1);
 102:         }
 103:         q = addarg(argv[i], q-1);
 104:         gotit++;
 105:     }
 106:     if(defargs!=0 && gotit==0){
 107:         if(defargs>argc)
 108:             goto Toofew;
 109:         for(i=0; i<defargs; i++){
 110:             *q++ = addc(' ');
 111:             q = addarg(argv[i], q);
 112:         }
 113:     }
 114:     i = system(cmd);
 115:     if(i == 127){
 116:         fprintf(stderr, "apply: no shell!\n");
 117:         exit(1);
 118:     }
 119:     return(max==0? (defargs==0? 1 : defargs) : max+1);
 120: }
 121: system(s)
 122: char *s;
 123: {
 124:     int status, pid, w;
 125:     char *shell = getenv("SHELL");
 126: 
 127:     if ((pid = fork()) == 0) {
 128:         execl(shell ? shell : "/bin/sh", "sh", "-c", s, 0);
 129:         _exit(127);
 130:     }
 131:     if(pid == -1){
 132:         fprintf(stderr, "apply: can't fork\n");
 133:         exit(1);
 134:     }
 135:     while ((w = wait(&status)) != pid && w != -1)
 136:         ;
 137:     if (w == -1)
 138:         status = -1;
 139:     return(status);
 140: }

Defined functions

Defined variables

Defined macros