71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* This file is part of Jehanne.
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*
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* Copyright (C) 2016 Giacomo Tesio <giacomo@tesio.it>
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*
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* Jehanne is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* Jehanne is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <u.h>
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#include <lib9.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: flip [ -s skip ] [ -n flip ] cmd args ...\n");
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exits("usage");
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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 skip, flip, i;
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char **nargv;
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skip = 0;
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flip = 1;
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ARGBEGIN {
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case 's': skip = atoi(EARGF(usage())); break;
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case 'n': flip = atoi(EARGF(usage())); break;
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default: usage();
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} ARGEND;
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++skip; // cmd must be skipped too
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if(argc < skip + (flip * 2))
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usage();
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nargv = malloc(sizeof(char *) * (argc + 1));
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if(nargv == nil)
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sysfatal("malloc: %r");
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for(i = 0; i < argc; ++i){
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if(i < skip){
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nargv[i] = argv[i];
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} else if(i < skip + flip) {
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nargv[i] = argv[argc - i + skip - 1];
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} else if(i > argc - flip - 1){
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nargv[i] = argv[skip + argc - i - 1];
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} else {
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nargv[i] = argv[i];
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}
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}
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sys_exec(*nargv, (const char **)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("/cmd/%s", *nargv);
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sys_exec(*nargv, (const char **)nargv);
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}
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sysfatal("exec: %r");
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}
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