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/* getopt.c -
getopt() for those systems that don't have it.
Derived from comp.sources.unix/volume3/att_getopt.
Modified by James Clark (jjc@jclark.com).
*/
#include <stdio.h>
#include <string.h>
#include "getopt.h"
#ifdef SWITCHAR
#include <dos.h>
#endif
int opterr = 1;
int optind = 1;
int optopt;
char *optarg;
#ifndef OPTION_CHAR
#define OPTION_CHAR '-'
#endif
int getopt(int argc, char **argv, char *opts)
{
#ifdef SWITCHAR
union REGS regs;
static char switchar = '\0';
#endif
static int sp = 1;
register int c;
register char *cp;
char *message;
#ifdef SWITCHAR
if (switchar == '\0') {
regs.x.ax = 0x3700;
intdos(®s, ®s);
if (!regs.x.cflag)
switchar = regs.h.dl;
else
switchar = '/';
}
#endif
if (sp == 1) {
if (optind >= argc)
return EOF;
if ((
#ifdef SWITCHAR
argv[optind][0] != switchar &&
#endif
argv[optind][0] != OPTION_CHAR) || argv[optind][1] == '\0') {
#ifdef REORDER_ARGS
int i;
for (i = optind; i < argc; i++)
if ((
#ifdef SWITCHAR
argv[i][0] == switchar ||
#endif
argv[i][0] == OPTION_CHAR) && argv[i][1] != '\0')
break;
if (i < argc) {
c = argv[i][1];
#ifdef CASE_INSENSITIVE_OPTIONS
if (isupper(c))
c = tolower(c);
#endif
if (c != ':' && c != OPTION_CHAR && (cp = strchr(opts, c)) != NULL
&& cp[1] == ':' && argv[i][2] == 0 && i < argc - 1) {
int j;
char *temp1 = argv[i];
char *temp2 = argv[i+1];
for (j = i - 1; j >= optind; j--)
argv[j+2] = argv[j];
argv[optind] = temp1;
argv[optind+1] = temp2;
}
else {
int j;
char *temp = argv[i];
for (j = i - 1; j >= optind; j--)
argv[j+1] = argv[j];
argv[optind] = temp;
}
}
else
#endif
return EOF;
}
if ((argv[optind][0] == OPTION_CHAR && argv[optind][1] == OPTION_CHAR
&& argv[optind][2] == '\0')
#ifdef SWITCHAR
|| (argv[optind][0] == switchar && argv[optind][1] == switchar
&& argv[optind][2] == '\0')
#endif
) {
optind++;
return(EOF);
}
}
optopt = c = argv[optind][sp];
#ifdef CASE_INSENSITIVE_OPTIONS
if (
#ifdef USE_ISASCII
isascii(c) &&
#endif /* USE_ISASCII */
isupper((unsigned char)c))
optopt = c = tolower((unsigned char)c);
#endif /* CASE_INSENSITIVE_OPTIONS */
if (c == ':' || (cp = strchr(opts, c)) == NULL) {
if (argv[optind][++sp] == '\0') {
optind++;
sp = 1;
}
message = ": illegal option -- ";
goto bad;
}
if (*++cp == ':') {
if (argv[optind][sp+1] != '\0')
optarg = &argv[optind++][sp+1];
else if (++optind >= argc) {
sp = 1;
message = ": option requires an argument -- ";
goto bad;
}
else
optarg = argv[optind++];
sp = 1;
}
else {
if (argv[optind][++sp] == '\0') {
sp = 1;
optind++;
}
optarg = NULL;
}
return c;
bad:
if (opterr) {
fputs(argv[0], stderr);
fputs(message, stderr);
fputc(optopt, stderr);
fputc('\n', stderr);
}
return '?';
}
/*
Local Variables:
c-indent-level: 4
c-continued-statement-offset: 4
c-brace-offset: 4
c-argdecl-indent: 4
c-label-offset: -4
tab-width: 4
End:
*/
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