91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
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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(argc, argv, opts)
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int argc;
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char **argv, *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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