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GETOPT.C
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C/C++ Source or Header
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1992-10-05
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2KB
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104 lines
/*
getopt.c
modified public-domain AT&T getopt(3)
*/
#include <stdio.h>
#include <string.h>
#ifdef _POSIX_SOURCE
# include <unistd.h>
#else
# define STDERR_FILENO 2
typedef signed int ssize_t;
# ifdef __STDC__
extern ssize_t write (int __fildes, const void *__buf, size_t __nbyte);
# else
extern ssize_t write ();
# endif
#endif
int opterr = 1;
int optind = 1;
int optopt;
char *optarg;
#ifdef __STDC__
static void ERR (char **argv, char *s, char c)
#else
static void ERR (argv, s, c)
char **argv, *s, c;
#endif
{
char errbuf[2];
if (opterr)
{
errbuf[0] = c;
errbuf[1] = '\n';
(void) write(STDERR_FILENO, argv[0], strlen(argv[0]));
(void) write(STDERR_FILENO, s, strlen(s));
(void) write(STDERR_FILENO, errbuf, sizeof errbuf);
}
}
#ifdef __STDC__
int getopt (int argc, char **argv, const char *opts)
#else
int getopt (argc, argv, opts)
int argc;
char **argv, *opts;
#endif
{
static int sp = 1, error = (int) '?';
static char sw = '-', eos = '\0', arg = ':';
register char c, *cp;
if (sp == 1)
if (optind >= argc || argv[optind][0] != sw
|| argv[optind][1] == eos)
return EOF;
else if (strcmp(argv[optind], "--") == 0)
{
optind++;
return EOF;
}
c = argv[optind][sp];
optopt = (int) c;
if (c == arg || (cp = strchr(opts, c)) == NULL)
{
ERR(argv, ": illegal option - ", c);
if (argv[optind][++sp] == eos)
{
optind++;
sp = 1;
}
return error;
}
else if (*++cp == arg)
{
if (argv[optind][sp + 1] != eos)
optarg = &argv[optind++][sp + 1];
else if (++optind >= argc)
{
ERR(argv, ": option requires an argument - ", c);
sp = 1;
return error;
}
else
optarg = argv[optind++];
sp = 1;
}
else
{
if (argv[optind][++sp] == eos)
{
sp = 1;
optind++;
}
optarg = NULL;
}
return (int) c;
}