You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
76 lines
1.7 KiB
76 lines
1.7 KiB
/*
|
|
getopt.c
|
|
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
|
|
int xoptind = 1; /* index of which argument is next */
|
|
char *xoptarg; /* pointer to argument of current option */
|
|
int xopterr = 0; /* allow error message */
|
|
|
|
static char *letP = NULL; /* remember next option char's location */
|
|
char SW = '-'; /* DOS switch character, either '-' or '/' */
|
|
|
|
/*
|
|
Parse the command line options, System V style.
|
|
|
|
Standard option syntax is:
|
|
|
|
option ::= SW [optLetter]* [argLetter space* argument]
|
|
|
|
*/
|
|
|
|
int xgetopt(int argc, char *argv[], char *optionS)
|
|
{
|
|
unsigned char ch;
|
|
char *optP;
|
|
|
|
if (SW == 0) {
|
|
SW = '/';
|
|
}
|
|
|
|
if (argc > xoptind) {
|
|
if (letP == NULL) {
|
|
if ((letP = argv[xoptind]) == NULL ||
|
|
*(letP++) != SW) goto gopEOF;
|
|
if (*letP == SW) {
|
|
xoptind++; goto gopEOF;
|
|
}
|
|
}
|
|
if (0 == (ch = *(letP++))) {
|
|
xoptind++; goto gopEOF;
|
|
}
|
|
if (':' == ch || (optP = strchr(optionS, ch)) == NULL)
|
|
goto gopError;
|
|
if (':' == *(++optP)) {
|
|
xoptind++;
|
|
if (0 == *letP) {
|
|
if (argc <= xoptind) goto gopError;
|
|
letP = argv[xoptind++];
|
|
}
|
|
xoptarg = letP;
|
|
letP = NULL;
|
|
} else {
|
|
if (0 == *letP) {
|
|
xoptind++;
|
|
letP = NULL;
|
|
}
|
|
xoptarg = NULL;
|
|
}
|
|
return ch;
|
|
}
|
|
gopEOF:
|
|
xoptarg = letP = NULL;
|
|
return EOF;
|
|
|
|
gopError:
|
|
xoptarg = NULL;
|
|
errno = EINVAL;
|
|
if (xopterr)
|
|
perror ("get command line option");
|
|
return ('?');
|
|
}
|