| 1 | /* |
| 2 | * getopt.c |
| 3 | * |
| 4 | * getopt_long(), or at least a common subset thereof: |
| 5 | * |
| 6 | * - Option reordering is not supported |
| 7 | * - -W foo is not supported |
| 8 | * - First optstring character "-" not supported. |
| 9 | * |
| 10 | * This file was imported from the klibc library from hpa |
| 11 | */ |
| 12 | |
| 13 | #include <stdint.h> |
| 14 | #include <unistd.h> |
| 15 | #include <string.h> |
| 16 | |
| 17 | #include "getopt.h" |
| 18 | |
| 19 | char *optarg = NULL; |
| 20 | int optind = 0, opterr = 0, optopt = 0; |
| 21 | |
| 22 | static struct getopt_private_state { |
| 23 | const char *optptr; |
| 24 | const char *last_optstring; |
| 25 | char *const *last_argv; |
| 26 | } pvt; |
| 27 | |
| 28 | static inline const char *option_matches(const char *arg_str, |
| 29 | const char *opt_name) |
| 30 | { |
| 31 | while (*arg_str != '\0' && *arg_str != '=') { |
| 32 | if (*arg_str++ != *opt_name++) |
| 33 | return NULL; |
| 34 | } |
| 35 | |
| 36 | if (*opt_name) |
| 37 | return NULL; |
| 38 | |
| 39 | return arg_str; |
| 40 | } |
| 41 | |
| 42 | int getopt_long_only(int argc, char *const *argv, const char *optstring, |
| 43 | const struct option *longopts, int *longindex) |
| 44 | { |
| 45 | const char *carg; |
| 46 | const char *osptr; |
| 47 | int opt; |
| 48 | |
| 49 | optarg = NULL; |
| 50 | |
| 51 | /* getopt() relies on a number of different global state |
| 52 | variables, which can make this really confusing if there is |
| 53 | more than one use of getopt() in the same program. This |
| 54 | attempts to detect that situation by detecting if the |
| 55 | "optstring" or "argv" argument have changed since last time |
| 56 | we were called; if so, reinitialize the query state. */ |
| 57 | |
| 58 | if (optstring != pvt.last_optstring || argv != pvt.last_argv || |
| 59 | optind < 1 || optind > argc) { |
| 60 | /* optind doesn't match the current query */ |
| 61 | pvt.last_optstring = optstring; |
| 62 | pvt.last_argv = argv; |
| 63 | optind = 1; |
| 64 | pvt.optptr = NULL; |
| 65 | } |
| 66 | |
| 67 | carg = argv[optind]; |
| 68 | |
| 69 | /* First, eliminate all non-option cases */ |
| 70 | |
| 71 | if (!carg || carg[0] != '-' || !carg[1]) |
| 72 | return -1; |
| 73 | |
| 74 | if (carg[1] == '-') { |
| 75 | const struct option *lo; |
| 76 | const char *opt_end = NULL; |
| 77 | |
| 78 | optind++; |
| 79 | |
| 80 | /* Either it's a long option, or it's -- */ |
| 81 | if (!carg[2]) { |
| 82 | /* It's -- */ |
| 83 | return -1; |
| 84 | } |
| 85 | |
| 86 | for (lo = longopts; lo->name; lo++) { |
| 87 | if ((opt_end = option_matches(carg+2, lo->name))) |
| 88 | break; |
| 89 | } |
| 90 | if (!opt_end) |
| 91 | return '?'; |
| 92 | |
| 93 | if (longindex) |
| 94 | *longindex = lo-longopts; |
| 95 | |
| 96 | if (*opt_end == '=') { |
| 97 | if (lo->has_arg) |
| 98 | optarg = (char *)opt_end+1; |
| 99 | else |
| 100 | return '?'; |
| 101 | } else if (lo->has_arg == 1) { |
| 102 | if (!(optarg = argv[optind])) |
| 103 | return '?'; |
| 104 | optind++; |
| 105 | } |
| 106 | |
| 107 | if (lo->flag) { |
| 108 | *lo->flag = lo->val; |
| 109 | return 0; |
| 110 | } else { |
| 111 | return lo->val; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | if ((uintptr_t) (pvt.optptr - carg) > (uintptr_t) strlen(carg)) { |
| 116 | /* Someone frobbed optind, change to new opt. */ |
| 117 | pvt.optptr = carg + 1; |
| 118 | } |
| 119 | |
| 120 | opt = *pvt.optptr++; |
| 121 | |
| 122 | if (opt != ':' && (osptr = strchr(optstring, opt))) { |
| 123 | if (osptr[1] == ':') { |
| 124 | if (*pvt.optptr) { |
| 125 | /* Argument-taking option with attached |
| 126 | argument */ |
| 127 | optarg = (char *)pvt.optptr; |
| 128 | optind++; |
| 129 | } else { |
| 130 | /* Argument-taking option with non-attached |
| 131 | argument */ |
| 132 | if (osptr[2] == ':') { |
| 133 | if (argv[optind + 1]) { |
| 134 | optarg = (char *)argv[optind+1]; |
| 135 | optind += 2; |
| 136 | } else { |
| 137 | optarg = NULL; |
| 138 | optind++; |
| 139 | } |
| 140 | return opt; |
| 141 | } else if (argv[optind + 1]) { |
| 142 | optarg = (char *)argv[optind+1]; |
| 143 | optind += 2; |
| 144 | } else { |
| 145 | /* Missing argument */ |
| 146 | optind++; |
| 147 | return (optstring[0] == ':') |
| 148 | ? ':' : '?'; |
| 149 | } |
| 150 | } |
| 151 | return opt; |
| 152 | } else { |
| 153 | /* Non-argument-taking option */ |
| 154 | /* pvt.optptr will remember the exact position to |
| 155 | resume at */ |
| 156 | if (!*pvt.optptr) |
| 157 | optind++; |
| 158 | return opt; |
| 159 | } |
| 160 | } else { |
| 161 | /* Unknown option */ |
| 162 | optopt = opt; |
| 163 | if (!*pvt.optptr) |
| 164 | optind++; |
| 165 | return '?'; |
| 166 | } |
| 167 | } |