projects / J-u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 72eda507 SA |
1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* | |
| 3 | * getopt.c - a simple getopt(3) implementation. See getopt.h for explanation. | |
| 4 | * | |
| 5 | * Copyright (C) 2020 Sean Anderson <[email protected]> | |
| 6 | * Copyright (c) 2007 Sascha Hauer <[email protected]>, Pengutronix | |
| 7 | */ | |
| 8 | ||
| 9 | #define LOG_CATEGORY LOGC_CORE | |
| 10 | ||
| 72eda507 SA |
11 | #include <getopt.h> |
| 12 | #include <log.h> | |
| 467382ca | 13 | #include <linux/string.h> |
| 72eda507 SA |
14 | |
| 15 | void getopt_init_state(struct getopt_state *gs) | |
| 16 | { | |
| 17 | gs->index = 1; | |
| 18 | gs->arg_index = 1; | |
| 19 | } | |
| 20 | ||
| 21 | int __getopt(struct getopt_state *gs, int argc, char *const argv[], | |
| 22 | const char *optstring, bool silent) | |
| 23 | { | |
| 24 | char curopt; /* current option character */ | |
| 25 | const char *curoptp; /* pointer to the current option in optstring */ | |
| 26 | ||
| 27 | while (1) { | |
| 28 | log_debug("arg_index: %d index: %d\n", gs->arg_index, | |
| 29 | gs->index); | |
| 30 | ||
| 31 | /* `--` indicates the end of options */ | |
| 32 | if (gs->arg_index == 1 && argv[gs->index] && | |
| 33 | !strcmp(argv[gs->index], "--")) { | |
| 34 | gs->index++; | |
| 35 | return -1; | |
| 36 | } | |
| 37 | ||
| 38 | /* Out of arguments */ | |
| 39 | if (gs->index >= argc) | |
| 40 | return -1; | |
| 41 | ||
| 42 | /* Can't parse non-options */ | |
| 43 | if (*argv[gs->index] != '-') | |
| 44 | return -1; | |
| 45 | ||
| 46 | /* We have found an option */ | |
| 47 | curopt = argv[gs->index][gs->arg_index]; | |
| 48 | if (curopt) | |
| 49 | break; | |
| 50 | /* | |
| 51 | * no more options in current argv[] element; try the next one | |
| 52 | */ | |
| 53 | gs->index++; | |
| 54 | gs->arg_index = 1; | |
| 55 | } | |
| 56 | ||
| 57 | /* look up current option in optstring */ | |
| 58 | curoptp = strchr(optstring, curopt); | |
| 59 | ||
| 60 | if (!curoptp) { | |
| 61 | if (!silent) | |
| 62 | printf("%s: invalid option -- %c\n", argv[0], curopt); | |
| 63 | gs->opt = curopt; | |
| 64 | gs->arg_index++; | |
| 65 | return '?'; | |
| 66 | } | |
| 67 | ||
| 68 | if (*(curoptp + 1) != ':') { | |
| 69 | /* option with no argument. Just return it */ | |
| 70 | gs->arg = NULL; | |
| 71 | gs->arg_index++; | |
| 72 | return curopt; | |
| 73 | } | |
| 74 | ||
| 75 | if (*(curoptp + 1) && *(curoptp + 2) == ':') { | |
| 76 | /* optional argument */ | |
| 77 | if (argv[gs->index][gs->arg_index + 1]) { | |
| 78 | /* optional argument with directly following arg */ | |
| 79 | gs->arg = argv[gs->index++] + gs->arg_index + 1; | |
| 80 | gs->arg_index = 1; | |
| 81 | return curopt; | |
| 82 | } | |
| 83 | if (gs->index + 1 == argc) { | |
| 84 | /* We are at the last argv[] element */ | |
| 85 | gs->arg = NULL; | |
| 86 | gs->index++; | |
| 87 | return curopt; | |
| 88 | } | |
| 89 | if (*argv[gs->index + 1] != '-') { | |
| 90 | /* | |
| 91 | * optional argument with arg in next argv[] element | |
| 92 | */ | |
| 93 | gs->index++; | |
| 94 | gs->arg = argv[gs->index++]; | |
| 95 | gs->arg_index = 1; | |
| 96 | return curopt; | |
| 97 | } | |
| 98 | ||
| 99 | /* no optional argument found */ | |
| 100 | gs->arg = NULL; | |
| 101 | gs->arg_index = 1; | |
| 102 | gs->index++; | |
| 103 | return curopt; | |
| 104 | } | |
| 105 | ||
| 106 | if (argv[gs->index][gs->arg_index + 1]) { | |
| 107 | /* required argument with directly following arg */ | |
| 108 | gs->arg = argv[gs->index++] + gs->arg_index + 1; | |
| 109 | gs->arg_index = 1; | |
| 110 | return curopt; | |
| 111 | } | |
| 112 | ||
| 113 | gs->index++; | |
| 114 | gs->arg_index = 1; | |
| 115 | ||
| 116 | if (gs->index >= argc || argv[gs->index][0] == '-') { | |
| 117 | if (!silent) | |
| 118 | printf("option requires an argument -- %c\n", curopt); | |
| 119 | gs->opt = curopt; | |
| 120 | return ':'; | |
| 121 | } | |
| 122 | ||
| 123 | gs->arg = argv[gs->index++]; | |
| 124 | return curopt; | |
| 125 | } |