util.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 wrappers to standard functions, which
  17  * throw exceptions upon failure.
  18  */
  19 #include <stdbool.h>
  20 #include <ctype.h>
  21
  22 static void *uci_malloc(struct uci_context *ctx, size_t size)
  23 {
  24         void *ptr;
  25
  26         ptr = malloc(size);
  27         if (!ptr)
  28                 UCI_THROW(ctx, UCI_ERR_MEM);
  29         memset(ptr, 0, size);
  30
  31         return ptr;
  32 }
  33
  34 static void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size)
  35 {
  36         ptr = realloc(ptr, size);
  37         if (!ptr)
  38                 UCI_THROW(ctx, UCI_ERR_MEM);
  39
  40         return ptr;
  41 }
  42
  43 static char *uci_strdup(struct uci_context *ctx, const char *str)
  44 {
  45         char *ptr;
  46
  47         ptr = strdup(str);
  48         if (!ptr)
  49                 UCI_THROW(ctx, UCI_ERR_MEM);
  50
  51         return ptr;
  52 }
  53
  54 static bool uci_validate_name(const char *str)
  55 {
  56         if (!*str)
  57                 return false;
  58
  59         while (*str) {
  60                 if (!isalnum(*str) && (*str != '_'))
  61                         return false;
  62                 str++;
  63         }
  64         return true;
  65 }
  66
  67 int uci_parse_tuple(struct uci_context *ctx, char *str, char **package, char **section, char **option, char **value)
  68 {
  69         char *last = NULL;
  70
  71         UCI_HANDLE_ERR(ctx);
  72         UCI_ASSERT(ctx, str && package && section && option);
  73
  74         *package = strtok(str, ".");
  75         if (!*package || !uci_validate_name(*package))
  76                 goto error;
  77
  78         last = *package;
  79         *section = strtok(NULL, ".");
  80         if (!*section)
  81                 goto lastval;
  82
  83         last = *section;
  84         *option = strtok(NULL, ".");
  85         if (!*option)
  86                 goto lastval;
  87
  88         last = *option;
  89
  90 lastval:
  91         last = strchr(last, '=');
  92         if (last) {
  93                 if (!value)
  94                         goto error;
  95
  96                 *last = 0;
  97                 last++;
  98                 if (!*last)
  99                         goto error;
 100                 *value = last;
 101         }
 102
 103         if (*section && !uci_validate_name(*section))
 104                 goto error;
 105         if (*option && !uci_validate_name(*option))
 106                 goto error;
 107
 108         goto done;
 109
 110 error:
 111         UCI_THROW(ctx, UCI_ERR_PARSE);
 112
 113 done:
 114         return 0;
 115 }
 116