122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/*
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* Copyright (c) 1984 through 2008, William LeFebvre
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* * Neither the name of William LeFebvre nor the names of other
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* "getopt" routine customized for top.
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*/
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/*
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* Many modern-day Unix implementations already have this function
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* in libc. The standard "getopt" is perfectly sufficient for top's
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* needs. If such a function exists in libc then you certainly don't
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* need to compile this one in. To prevent this function from being
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* compiled, define "HAVE_GETOPT". This is usually done in the "CFLAGS"
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* line of the corresponding machine module.
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*/
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/*
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* This empty declaration exists solely to placate overexhuberant C
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* compilers that like to warn you about content-free files.
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*/
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static void __empty();
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#ifndef HAVE_GETOPT
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/*LINTLIBRARY*/
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#include "os.h"
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#ifndef NULL
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#define NULL 0
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#endif
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#ifndef EOF
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#define EOF (-1)
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#endif
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#define ERR(s, c) if(opterr){\
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extern int write();\
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char errbuf[2];\
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errbuf[0] = c; errbuf[1] = '\n';\
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(void) write(2, argv[0], strlen(argv[0]));\
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(void) write(2, s, strlen(s));\
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(void) write(2, errbuf, 2);}
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int opterr = 1;
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int optind = 1;
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int optopt;
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char *optarg;
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int
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getopt(int argc, char **argv, char *opts)
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{
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static int sp = 1;
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register int c;
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register char *cp;
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if(sp == 1)
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if(optind >= argc ||
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argv[optind][0] != '-' || argv[optind][1] == '\0')
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return(EOF);
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else if(strcmp(argv[optind], "--") == 0) {
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optind++;
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return(EOF);
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}
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optopt = c = argv[optind][sp];
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if(c == ':' || (cp=strchr(opts, c)) == NULL) {
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ERR(": unknown option, -", c);
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if(argv[optind][++sp] == '\0') {
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optind++;
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sp = 1;
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}
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return('?');
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}
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if(*++cp == ':') {
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if(argv[optind][sp+1] != '\0')
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optarg = &argv[optind++][sp+1];
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else if(++optind >= argc) {
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ERR(": argument missing for -", c);
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sp = 1;
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return('?');
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} else
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optarg = argv[optind++];
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sp = 1;
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} else {
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if(argv[optind][++sp] == '\0') {
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sp = 1;
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optind++;
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}
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optarg = NULL;
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}
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return(c);
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}
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#endif /* HAVE_GETOPT */
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