src/common/context.cpp

   1 /*
   2  * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #include "context.hpp"
   9 #include <stddef.h>
  10 #include <string.h>
  11 #include <common/error.hpp>
  12 #include <common/macros.hpp>
  13
  14 int parse_application_context(const char *str, char **out_provider_name,
  15                 char **out_ctx_name)
  16 {
  17         const char app_ctx_prefix[] = "$app.";
  18         char *provider_name = NULL, *ctx_name = NULL;
  19         size_t i, len, colon_pos = 0, provider_name_len, ctx_name_len;
  20
  21         if (!str || !out_provider_name || !out_ctx_name) {
  22                 goto not_found;
  23         }
  24
  25         len = strlen(str);
  26         if (len <= sizeof(app_ctx_prefix) - 1) {
  27                 goto not_found;
  28         }
  29
  30         /* String starts with $app. */
  31         if (strncmp(str, app_ctx_prefix, sizeof(app_ctx_prefix) - 1)) {
  32                 goto not_found;
  33         }
  34
  35         /* Validate that the ':' separator is present. */
  36         for (i = sizeof(app_ctx_prefix); i < len; i++) {
  37                 const char c = str[i];
  38
  39                 if (c == ':') {
  40                         colon_pos = i;
  41                         break;
  42                 }
  43         }
  44
  45         /*
  46          * No colon found or no ctx name ("$app.provider:") or no provider name
  47          * given ("$app.:..."), which is invalid.
  48          */
  49         if (!colon_pos || colon_pos == len ||
  50                         colon_pos == sizeof(app_ctx_prefix)) {
  51                 goto not_found;
  52         }
  53
  54         provider_name_len = colon_pos - sizeof(app_ctx_prefix) + 2;
  55         provider_name = calloc<char>(provider_name_len);
  56         if (!provider_name) {
  57                 PERROR("malloc provider_name");
  58                 goto not_found;
  59         }
  60         strncpy(provider_name, str + sizeof(app_ctx_prefix) - 1,
  61                         provider_name_len - 1);
  62
  63         ctx_name_len = len - colon_pos;
  64         ctx_name = calloc<char>(ctx_name_len);
  65         if (!ctx_name) {
  66                 PERROR("malloc ctx_name");
  67                 goto not_found;
  68         }
  69         strncpy(ctx_name, str + colon_pos + 1, ctx_name_len - 1);
  70
  71         *out_provider_name = provider_name;
  72         *out_ctx_name = ctx_name;
  73         return 0;
  74 not_found:
  75         free(provider_name);
  76         free(ctx_name);
  77         return -1;
  78 }
  79