Commit b2ccd693 authored by Kurt Zeilenga's avatar Kurt Zeilenga
Browse files

add public domain getopt(3)

parent 46dbdb86
/*
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
# ifdef __STDC__
extern int write (int fildes, char * buf, unsigned nbyte);
# else
extern int 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];
#ifdef DF_TRACE_DEBUG
printf("DF_TRACE_DEBUG: static void ERR () in getopt.c\n");
#endif
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, 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;
#ifdef DF_TRACE_DEBUG
printf("DF_TRACE_DEBUG: int getopt () in getopt.c\n");
#endif
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;
}
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