mrsh/getopt.c -rw-r--r-- 1.5 KiB View raw
                                                                                
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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <mrsh/getopt.h>
#include <stdio.h>

char *mrsh_optarg = NULL;
int mrsh_optind = 1;
int mrsh_opterr = 1;
int mrsh_optopt = 0;
int mrsh_optpos = 1;

int mrsh_getopt(int argc, char *const argv[], const char *optstring) {
14 references
assert(argv[argc] == NULL); mrsh_optarg = NULL; if (mrsh_optind == 0) { mrsh_optind = 1; mrsh_optpos = 1; } if (mrsh_optind >= argc) { return -1; } if (argv[mrsh_optind][0] != '-') { return -1; } if (argv[mrsh_optind][1] == '\0') { return -1; } if (argv[mrsh_optind][1] == '-') { mrsh_optind++; return -1; } const char *c = optstring; if (*c == ':') { c++; } mrsh_optopt = 0; int opt = argv[mrsh_optind][mrsh_optpos]; for (; *c != '\0'; c++) { if (*c != opt) { continue; } if (c[1] != ':') { if (argv[mrsh_optind][mrsh_optpos + 1] == '\0') { mrsh_optind++; mrsh_optpos = 1; } else { mrsh_optpos++; } return opt; } if (argv[mrsh_optind][mrsh_optpos + 1] != '\0') { mrsh_optarg = &argv[mrsh_optind][mrsh_optpos + 1]; } else { if (mrsh_optind + 2 > argc) { mrsh_optopt = opt; if (mrsh_opterr != 0 && optstring[0] != ':') { fprintf(stderr, "%s: Option '%c' requires an argument.\n", argv[0], mrsh_optopt); } return optstring[0] == ':' ? ':' : '?'; } mrsh_optarg = argv[++mrsh_optind]; } mrsh_optind++; return opt; } if (mrsh_opterr != 0 && optstring[0] != ':') { fprintf(stderr, "%s: Option '%c' not found.\n", argv[0], opt); } return '?'; }