Richard Alpe | f043759 | 2015-05-07 15:07:36 +0200 | [diff] [blame] | 1 | /* |
| 2 | * cmdl.c Framework for handling command line options. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Richard Alpe <richard.alpe@ericsson.com> |
| 10 | */ |
| 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <string.h> |
| 14 | #include <errno.h> |
| 15 | |
| 16 | #include <libmnl/libmnl.h> |
| 17 | |
| 18 | #include "cmdl.h" |
| 19 | |
| 20 | const struct cmd *find_cmd(const struct cmd *cmds, char *str) |
| 21 | { |
| 22 | const struct cmd *c; |
| 23 | const struct cmd *match = NULL; |
| 24 | |
| 25 | for (c = cmds; c->cmd; c++) { |
| 26 | if (strstr(c->cmd, str) != c->cmd) |
| 27 | continue; |
| 28 | if (match) |
| 29 | return NULL; |
| 30 | match = c; |
| 31 | } |
| 32 | |
| 33 | return match; |
| 34 | } |
| 35 | |
| 36 | static struct opt *find_opt(struct opt *opts, char *str) |
| 37 | { |
| 38 | struct opt *o; |
| 39 | struct opt *match = NULL; |
| 40 | |
| 41 | for (o = opts; o->key; o++) { |
| 42 | if (strstr(o->key, str) != o->key) |
| 43 | continue; |
| 44 | if (match) |
| 45 | return NULL; |
| 46 | |
| 47 | match = o; |
| 48 | } |
| 49 | |
| 50 | return match; |
| 51 | } |
| 52 | |
| 53 | struct opt *get_opt(struct opt *opts, char *key) |
| 54 | { |
| 55 | struct opt *o; |
| 56 | |
| 57 | for (o = opts; o->key; o++) { |
| 58 | if (strcmp(o->key, key) == 0 && o->val) |
| 59 | return o; |
| 60 | } |
| 61 | |
| 62 | return NULL; |
| 63 | } |
| 64 | |
Richard Alpe | ed81dea | 2016-08-30 10:37:00 +0200 | [diff] [blame] | 65 | bool has_opt(struct opt *opts, char *key) |
| 66 | { |
| 67 | return get_opt(opts, key) ? true : false; |
| 68 | } |
| 69 | |
Richard Alpe | f043759 | 2015-05-07 15:07:36 +0200 | [diff] [blame] | 70 | char *shift_cmdl(struct cmdl *cmdl) |
| 71 | { |
| 72 | int next; |
| 73 | |
| 74 | if (cmdl->optind < cmdl->argc) |
| 75 | next = (cmdl->optind)++; |
| 76 | else |
| 77 | next = cmdl->argc; |
| 78 | |
| 79 | return cmdl->argv[next]; |
| 80 | } |
| 81 | |
| 82 | /* Returns the number of options parsed or a negative error code upon failure */ |
| 83 | int parse_opts(struct opt *opts, struct cmdl *cmdl) |
| 84 | { |
| 85 | int i; |
| 86 | int cnt = 0; |
| 87 | |
Richard Alpe | ed81dea | 2016-08-30 10:37:00 +0200 | [diff] [blame] | 88 | for (i = cmdl->optind; i < cmdl->argc; i++) { |
Richard Alpe | f043759 | 2015-05-07 15:07:36 +0200 | [diff] [blame] | 89 | struct opt *o; |
| 90 | |
| 91 | o = find_opt(opts, cmdl->argv[i]); |
| 92 | if (!o) { |
| 93 | fprintf(stderr, "error, invalid option \"%s\"\n", |
| 94 | cmdl->argv[i]); |
| 95 | return -EINVAL; |
| 96 | } |
Richard Alpe | ed81dea | 2016-08-30 10:37:00 +0200 | [diff] [blame] | 97 | if (o->flag & OPT_KEYVAL) { |
| 98 | cmdl->optind++; |
| 99 | i++; |
| 100 | } |
Richard Alpe | f043759 | 2015-05-07 15:07:36 +0200 | [diff] [blame] | 101 | cnt++; |
Richard Alpe | ed81dea | 2016-08-30 10:37:00 +0200 | [diff] [blame] | 102 | o->val = cmdl->argv[i]; |
| 103 | cmdl->optind++; |
Richard Alpe | f043759 | 2015-05-07 15:07:36 +0200 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | return cnt; |
| 107 | } |
| 108 | |
| 109 | int run_cmd(struct nlmsghdr *nlh, const struct cmd *caller, |
| 110 | const struct cmd *cmds, struct cmdl *cmdl, void *data) |
| 111 | { |
| 112 | char *name; |
| 113 | const struct cmd *cmd; |
| 114 | |
| 115 | if ((cmdl->optind) >= cmdl->argc) { |
| 116 | if (caller->help) |
| 117 | (caller->help)(cmdl); |
| 118 | return -EINVAL; |
| 119 | } |
| 120 | name = cmdl->argv[cmdl->optind]; |
| 121 | (cmdl->optind)++; |
| 122 | |
| 123 | cmd = find_cmd(cmds, name); |
| 124 | if (!cmd) { |
| 125 | /* Show help about last command if we don't find this one */ |
| 126 | if (help_flag && caller->help) { |
| 127 | (caller->help)(cmdl); |
| 128 | } else { |
| 129 | fprintf(stderr, "error, invalid command \"%s\"\n", name); |
| 130 | fprintf(stderr, "use --help for command help\n"); |
| 131 | } |
| 132 | return -EINVAL; |
| 133 | } |
| 134 | |
| 135 | return (cmd->func)(nlh, cmd, cmdl, data); |
| 136 | } |