73 lines
1.3 KiB
C
73 lines
1.3 KiB
C
#include <u.h>
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#include <libc.h>
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#include <bio.h>
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void
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usage(void)
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{
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fprint(2, "usage: xargs [ -n lines ] [ -p procs ] args ...\n");
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exits("usage");
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}
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void
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dowait(void)
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{
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while(waitpid() != -1)
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;
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}
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void
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main(int argc, char **argv)
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{
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int lines, procs, i, j, run;
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char **nargv, **args, **p;
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static Biobuf bp;
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lines = 10;
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procs = 1;
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ARGBEGIN {
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case 'n': lines = atoi(EARGF(usage())); break;
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case 'p': procs = atoi(EARGF(usage())); break;
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default: usage();
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} ARGEND;
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if(argc < 1)
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usage();
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nargv = malloc(sizeof(char *) * (argc + lines + 1));
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if(nargv == nil)
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sysfatal("malloc: %r");
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memcpy(nargv, argv, sizeof(char *) * argc);
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args = nargv + argc;
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if(Binit(&bp, 0, OREAD) < 0)
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sysfatal("Binit: %r");
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Blethal(&bp, nil);
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atexit(dowait);
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for(j = 0, run = 1; run; j++){
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if(j >= procs)
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waitpid();
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memset(args, 0, sizeof(char *) * (lines + 1));
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for(i = 0; i < lines; i++)
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if((args[i] = Brdstr(&bp, '\n', 1)) == nil){
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if(i == 0)
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exits(nil);
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run = 0;
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break;
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}
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switch(fork()){
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case -1:
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sysfatal("fork: %r");
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case 0:
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exec(*nargv, nargv);
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if(**nargv != '/' && strncmp(*nargv, "./", 2) != 0 &&
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strncmp(*nargv, "../", 3) != 0){
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*nargv = smprint("/bin/%s", *nargv);
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exec(*nargv, nargv);
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}
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sysfatal("exec: %r");
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}
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for(p = args; *p; p++)
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free(*p);
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}
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exits(nil);
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}
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