A getopt.c for your amusement

This commit is contained in:
Guido van Rossum 1994-04-14 14:08:22 +00:00
parent 26d86dba2f
commit 2508ade19e
1 changed files with 54 additions and 0 deletions

54
Python/getopt.c Normal file
View File

@ -0,0 +1,54 @@
/* An implementation of getopt() by Amrit Prem */
#include <stdio.h>
#include <string.h>
#define bool int
#define TRUE 1
#define FALSE 0
#define EOS '\0'
bool opterr = TRUE; /* generate error messages */
int optind = 1; /* index into argv array */
char * optarg = NULL; /* optional argument */
int getopt(int argc, char *argv[], const char optstring[])
{
static char *opt_ptr = "";
register char *ptr;
int option;
if (*opt_ptr == EOS) {
if (optind >= argc || argv[optind][0] != '-')
return -1;
else if (strcmp(argv[optind], "--") == 0) {
++optind;
return -1;
}
opt_ptr = argv[optind++] + 1;
}
if ((ptr = strchr(optstring, option = *opt_ptr++)) == NULL) {
if (opterr)
fprintf(stderr, "Unknown option: -%c\n", option);
return '?';
}
if (*(ptr + 1) == ':') {
if (optind >= argc) {
if (opterr)
fprintf(stderr, "Argument expected for the -%c option\n", option);
return '?';
}
optarg = argv[optind++];
}
return option;
}