src/system/libroot/posix/stdlib/getsubopt.cpp

   1 /*
   2  * Copyright 2010, Oliver Tappe <zooey@hirschkaefer.de>.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include <stdlib.h>
   8 #include <string.h>
   9
  10
  11 int
  12 getsubopt(char** optionPtr, char* const* keys, char** valuePtr)
  13 {
  14         if (optionPtr == NULL || valuePtr == NULL)
  15                 return -1;
  16
  17         char* option = *optionPtr;
  18         if (*option == '\0')
  19                 return -1;
  20
  21         char* startOfNextOption = strchr(option, ',');
  22         if (startOfNextOption != NULL)
  23                 *startOfNextOption++ = '\0';
  24         else
  25                 startOfNextOption = option + strlen(option);
  26         *optionPtr = startOfNextOption;
  27
  28         char* startOfValue = strchr(option, '=');
  29         if (startOfValue != NULL)
  30                 *startOfValue++ = '\0';
  31         *valuePtr = startOfValue;
  32
  33         for (int keyIndex = 0; keys[keyIndex] != NULL; ++keyIndex) {
  34                 if (strcmp(option, keys[keyIndex]) == 0)
  35                         return keyIndex;
  36         }
  37
  38         return -1;
  39 }