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  1. /* strtoul example */
  2. #include <stdio.h>      /* printf, NULL */
  3. #include <stdlib.h>     /* strtoul */
  4. #include <errno.h>
  5.  
  6. signed int GetIdentifier(const char* idString)
  7. {
  8.   char *str_end;
  9.   int id = -1;
  10.   errno = 0;
  11.   id = strtoul(idString, &str_end, 16);
  12.   printf("Id (%s) - str_end %s - errno %d.\n", idString, str_end, errno);
  13.   if ( *str_end != '\0' || (errno == ERANGE))
  14.   {
  15.     printf("Error while converting Id (%s) - str_end %s - errno %d.\n", idString, str_end, errno);
  16.     return -1;
  17.   }
  18.  
  19.   // Return error if converted Id is more than 29-bit
  20.   if(id > 0x1FFFFFFF)
  21.   {
  22.     printf("Error: Id (%s) should fit on 29 bits (maximum value: 0x1FFFFFFF).\n", idString);
  23.     return -1;
  24.   }
  25.   printf("sucess\n");
  26.   return id;
  27. }
  28.  
  29.  
  30. int main ()
  31. {
  32.   GetIdentifier("inv");
  33.   GetIdentifier("0x210000000");
  34.   GetIdentifier("0x10000000");
  35.  
  36.   return 0;
  37. }
  38.  
  39.  
  40.  
  41.  
  42.  
Success #stdin #stdout 0s 2728KB
comments (?)
stdin 
Standard input is empty
stdout 
Id (inv) - str_end inv - errno 0.
Error while converting Id (inv) - str_end inv - errno 0.
Id (0x210000000) - str_end  - errno 34.
Error while converting Id (0x210000000) - str_end  - errno 34.
Id (0x10000000) - str_end  - errno 0.
sucess
https://ideone.com/LlcNWw
language:
C++ 4.3.2 (gcc-4.3.2)
created:
8 years ago
visibility:
public

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