105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
|
/*
|
||
|
|
* * @(#)getopt.c 2.3 (smail) 5/30/87
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Here's something you've all been waiting for: the AT&T public domain
|
||
|
|
* source for getopt(3). It is the code which was given out at the 1985
|
||
|
|
* UNIFORUM conference in Dallas. I obtained it by electronic mail directly
|
||
|
|
* from AT&T. The people there assure me that it is indeed in the public
|
||
|
|
* domain.
|
||
|
|
*
|
||
|
|
* There is no manual page. That is because the one they gave out at UNIFORUM
|
||
|
|
* was slightly different from the current System V Release 2 manual page.
|
||
|
|
* The difference apparently involved a note about the famous rules 5 and 6,
|
||
|
|
* recommending using white space between an option and its first argument,
|
||
|
|
* and not grouping options that have arguments. Getopt itself is currently
|
||
|
|
* lenient about both of these things White space is allowed, but not
|
||
|
|
* mandatory, and the last option in a group can have an argument. That
|
||
|
|
* particular version of the man page evidently has no official existence,
|
||
|
|
* and my source at AT&T did not send a copy. The current SVR2 man page
|
||
|
|
* reflects the actual behavior of this getopt. However, I am not about to
|
||
|
|
* post a copy of anything licensed by AT&T.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifdef BSD
|
||
|
|
#include <strings.h>
|
||
|
|
#else
|
||
|
|
#define index strchr
|
||
|
|
#include <string.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* LINTLIBRARY */
|
||
|
|
#ifndef NULL
|
||
|
|
#define NULL 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define EOF (-1)
|
||
|
|
#define ERR(s, c) if(opterr){\
|
||
|
|
extern int write(int, void *, unsigned);\
|
||
|
|
char errbuf[2];\
|
||
|
|
errbuf[0] = (char)c; errbuf[1] = '\n';\
|
||
|
|
(void) write(2, strlwr(argv[0]), (unsigned)strlen(argv[0]));\
|
||
|
|
(void) write(2, s, (unsigned)strlen(s));\
|
||
|
|
(void) write(2, errbuf, 2);}
|
||
|
|
|
||
|
|
extern char *index();
|
||
|
|
|
||
|
|
int opterr = 1;
|
||
|
|
int optind = 1;
|
||
|
|
int optopt;
|
||
|
|
char *optarg;
|
||
|
|
|
||
|
|
int getopt(int argc, char *argv[], char *opts)
|
||
|
|
{
|
||
|
|
static int sp = 1;
|
||
|
|
register int c;
|
||
|
|
register char *cp;
|
||
|
|
|
||
|
|
if (sp == 1)
|
||
|
|
{
|
||
|
|
if (optind >= argc || argv[optind][0] != '-' ||
|
||
|
|
argv[optind][1] == '\0')
|
||
|
|
return (EOF);
|
||
|
|
else if (strcmp(argv[optind], "--") == 0)
|
||
|
|
{
|
||
|
|
optind++;
|
||
|
|
return (EOF);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
optopt = c = argv[optind][sp];
|
||
|
|
if (c == ':' || (cp = index(opts, c)) == NULL)
|
||
|
|
{
|
||
|
|
ERR(": illegal option -- ", c);
|
||
|
|
if (argv[optind][++sp] == '\0')
|
||
|
|
{
|
||
|
|
optind++;
|
||
|
|
sp = 1;
|
||
|
|
}
|
||
|
|
return ('?');
|
||
|
|
}
|
||
|
|
if (*++cp == ':')
|
||
|
|
{
|
||
|
|
if (argv[optind][sp + 1] != '\0')
|
||
|
|
optarg = &argv[optind++][sp + 1];
|
||
|
|
else if (++optind >= argc)
|
||
|
|
{
|
||
|
|
ERR(": option requires an argument -- ", c);
|
||
|
|
sp = 1;
|
||
|
|
return ('?');
|
||
|
|
}
|
||
|
|
else optarg = argv[optind++];
|
||
|
|
sp = 1;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (argv[optind][++sp] == '\0')
|
||
|
|
{
|
||
|
|
sp = 1;
|
||
|
|
optind++;
|
||
|
|
}
|
||
|
|
optarg = NULL;
|
||
|
|
}
|
||
|
|
return (c);
|
||
|
|
}
|