libuci.c

   1 /*
   2  * libuci - Library for the Unified Configuration Interface
   3  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 /*
  16  * This file contains some common code for the uci library
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <sys/types.h>
  21 #include <stdbool.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include "uci.h"
  26 #include "err.h"
  27
  28 static const char *uci_confdir = UCI_CONFDIR;
  29 static const char *uci_savedir = UCI_SAVEDIR;
  30
  31 static const char *uci_errstr[] = {
  32         [UCI_OK] =            "Success",
  33         [UCI_ERR_MEM] =       "Out of memory",
  34         [UCI_ERR_INVAL] =     "Invalid argument",
  35         [UCI_ERR_NOTFOUND] =  "Entry not found",
  36         [UCI_ERR_IO] =        "I/O error",
  37         [UCI_ERR_PARSE] =     "Parse error",
  38         [UCI_ERR_DUPLICATE] = "Duplicate entry",
  39         [UCI_ERR_UNKNOWN] =   "Unknown error",
  40 };
  41
  42 static void uci_cleanup(struct uci_context *ctx);
  43
  44 #include "uci_internal.h"
  45 #include "util.c"
  46 #include "list.c"
  47 #include "history.c"
  48 #include "file.c"
  49
  50 /* exported functions */
  51 struct uci_context *uci_alloc_context(void)
  52 {
  53         struct uci_context *ctx;
  54
  55         ctx = (struct uci_context *) malloc(sizeof(struct uci_context));
  56         memset(ctx, 0, sizeof(struct uci_context));
  57         uci_list_init(&ctx->root);
  58         uci_list_init(&ctx->history_path);
  59         ctx->flags = UCI_FLAG_STRICT;
  60
  61         ctx->confdir = (char *) uci_confdir;
  62         ctx->savedir = (char *) uci_savedir;
  63         ctx->backend = &uci_file_backend;
  64
  65         return ctx;
  66 }
  67
  68 void uci_free_context(struct uci_context *ctx)
  69 {
  70         struct uci_element *e, *tmp;
  71
  72         if (ctx->confdir != uci_confdir)
  73                 free(ctx->confdir);
  74         if (ctx->savedir != uci_savedir)
  75                 free(ctx->savedir);
  76
  77         uci_cleanup(ctx);
  78         UCI_TRAP_SAVE(ctx, ignore);
  79         uci_foreach_element_safe(&ctx->root, tmp, e) {
  80                 struct uci_package *p = uci_to_package(e);
  81                 uci_free_package(&p);
  82         }
  83         uci_foreach_element_safe(&ctx->history_path, tmp, e) {
  84                 uci_free_element(e);
  85         }
  86         free(ctx);
  87         UCI_TRAP_RESTORE(ctx);
  88
  89 ignore:
  90         return;
  91 }
  92
  93 int uci_set_confdir(struct uci_context *ctx, const char *dir)
  94 {
  95         char *cdir;
  96
  97         UCI_HANDLE_ERR(ctx);
  98         UCI_ASSERT(ctx, dir != NULL);
  99
 100         cdir = uci_strdup(ctx, dir);
 101         if (ctx->confdir != uci_confdir)
 102                 free(ctx->confdir);
 103         ctx->confdir = cdir;
 104         return 0;
 105 }
 106
 107 static void uci_cleanup(struct uci_context *ctx)
 108 {
 109         struct uci_parse_context *pctx;
 110
 111         if (ctx->buf) {
 112                 free(ctx->buf);
 113                 ctx->buf = NULL;
 114                 ctx->bufsz = 0;
 115         }
 116
 117         pctx = ctx->pctx;
 118         if (!pctx)
 119                 return;
 120
 121         ctx->pctx = NULL;
 122         if (pctx->package)
 123                 uci_free_package(&pctx->package);
 124
 125         if (pctx->buf)
 126                 free(pctx->buf);
 127
 128         free(pctx);
 129 }
 130
 131 void uci_perror(struct uci_context *ctx, const char *prefix)
 132 {
 133         int err;
 134
 135         if (!ctx)
 136                 err = UCI_ERR_INVAL;
 137         else
 138                 err = ctx->errno;
 139
 140         if ((err < 0) || (err >= UCI_ERR_LAST))
 141                 err = UCI_ERR_UNKNOWN;
 142
 143         if (prefix)
 144                 fprintf(stderr, "%s: ", prefix);
 145         if (ctx->func)
 146                 fprintf(stderr, "%s: ", ctx->func);
 147
 148         switch (err) {
 149         case UCI_ERR_PARSE:
 150                 if (ctx->pctx) {
 151                         fprintf(stderr, "%s (%s) at line %d, byte %d\n", uci_errstr[err], (ctx->pctx->reason ? ctx->pctx->reason : "unknown"), ctx->pctx->line, ctx->pctx->byte);
 152                         break;
 153                 }
 154                 /* fall through */
 155         default:
 156                 fprintf(stderr, "%s\n", uci_errstr[err]);
 157                 break;
 158         }
 159 }
 160
 161 int uci_list_configs(struct uci_context *ctx, char ***list)
 162 {
 163         UCI_HANDLE_ERR(ctx);
 164         UCI_ASSERT(ctx, list != NULL);
 165         UCI_ASSERT(ctx, ctx->backend && ctx->backend->list_configs);
 166         *list = ctx->backend->list_configs(ctx);
 167         return 0;
 168 }
 169
 170 int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 171 {
 172         UCI_HANDLE_ERR(ctx);
 173         UCI_ASSERT(ctx, package != NULL);
 174         UCI_ASSERT(ctx, *package != NULL);
 175         UCI_ASSERT(ctx, ctx->backend && ctx->backend->commit);
 176         ctx->backend->commit(ctx, package, overwrite);
 177         return 0;
 178 }
 179
 180 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
 181 {
 182         struct uci_package *p;
 183         UCI_HANDLE_ERR(ctx);
 184         UCI_ASSERT(ctx, ctx->backend && ctx->backend->load);
 185         p = ctx->backend->load(ctx, name);
 186         if (package)
 187                 *package = p;
 188
 189         return 0;
 190 }
 191
 192