27656a0cbc
1) Shorten synopsis and reflect this in the manual 2) Use argv0 in usage() 3) Decrement argc in argv-loop for consistency 4) Make it clearer which error-code results from which errno in enprintf 5) Use idiomatic for-loop also for environ. Don't increment these pointers in the loop itself!
46 lines
737 B
C
46 lines
737 B
C
/* See LICENSE file for copyright and license details. */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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extern char **environ;
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static void
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usage(void)
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{
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eprintf("usage: %s [-i] [-u var] ... [var=value] ... [cmd [arg ...]]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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ARGBEGIN {
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case 'i':
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if (environ)
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*environ = NULL;
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break;
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case 'u':
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unsetenv(EARGF(usage()));
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break;
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default:
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usage();
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} ARGEND;
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for (; *argv && strchr(*argv, '='); argc--, argv++)
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putenv(*argv);
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if (*argv) {
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execvp(*argv, argv);
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enprintf(126 + (errno == EEXIST), "execvp: %s:", *argv);
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}
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for (; environ && *environ; environ++)
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puts(*environ);
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return 0;
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}
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