Usermode/Libraries/libc.so_src/stdlib.c

   1 /*\r
   2  * AcessOS Basic C Library\r
   3  * stdlib.c\r
   4  */\r
   5 /**\r
   6  * \todo Move half of these to stdio\r
   7  */\r
   8 #include <acess/sys.h>\r
   9 #include <stdlib.h>\r
  10 #include <stdio.h>\r
  11 #include "lib.h"\r
  12 \r
  13 #define _stdout 1\r
  14 #define _stdin  0\r
  15 \r
  16 // === IMPORTS ===\r
  17 extern int      fprintfv(FILE *fp, const char *format, va_list args);\r
  18 \r
  19 // === PROTOTYPES ===\r
  20 EXPORT int      atoi(const char *str);\r
  21 EXPORT void     exit(int status);\r
  22 \r
  23 // === CODE ===\r
  24 /**\r
  25  * \fn EXPORT void exit(int status)\r
  26  * \brief Exit\r
  27  */\r
  28 EXPORT void exit(int status)\r
  29 {\r
  30         _exit(status);\r
  31 }\r
  32 \r
  33 /**\r
  34  */\r
  35 EXPORT int atoi(const char *str)\r
  36 {\r
  37          int    neg = 0;\r
  38          int    ret = 0;\r
  39         \r
  40         // NULL Check\r
  41         if(!str)        return 0;\r
  42         \r
  43         while(*str == ' ' || *str == '\t')      str++;\r
  44         \r
  45         // Check for negative\r
  46         if(*str == '-') {\r
  47                 neg = 1;\r
  48                 str++;\r
  49         }\r
  50         \r
  51         if(*str == '0') {\r
  52                 str ++;\r
  53                 if(*str == 'x') {\r
  54                         str++;\r
  55                         // Hex\r
  56                         while( ('0' <= *str && *str <= '9')\r
  57                                 || ('A' <= *str && *str <= 'F' )\r
  58                                 || ('a' <= *str && *str <= 'f' )\r
  59                                 )\r
  60                         {\r
  61                                 ret *= 16;\r
  62                                 if(*str <= '9') {\r
  63                                         ret += *str - '0';\r
  64                                 } else if (*str <= 'F') {\r
  65                                         ret += *str - 'A' + 10;\r
  66                                 } else {\r
  67                                         ret += *str - 'a' + 10;\r
  68                                 }\r
  69                                 str++;\r
  70                         }\r
  71                 } else {\r
  72                         // Octal\r
  73                         while( '0' <= *str && *str <= '7' )\r
  74                         {\r
  75                                 ret *= 8;\r
  76                                 ret += *str - '0';\r
  77                                 str++;\r
  78                         }\r
  79                 }\r
  80         } else {\r
  81                 // Decimal\r
  82                 while( '0' <= *str && *str <= '9' )\r
  83                 {\r
  84                         ret *= 10;\r
  85                         ret += *str - '0';\r
  86                         str++;\r
  87                 }\r
  88         }\r
  89         \r
  90         // Negate if needed\r
  91         if(neg) ret = -ret;\r
  92         return ret;\r
  93 }\r