src/apc/main.c

   1 /*!@file
   2   \brief   APC main driver
   3   \details The driver assumes the existence of a bison-generated parser,
   4            referenced by the external function 'yyparse'.
   5            It also assumes the existence of a lexer which must be initialized
   6            before parsing, referenced by the external function 'lexer_init'
   7            which assumes standard error handling.
   8            All input arguments are made available through the exposed (that is,
   9            non-static) array of character pointers 'cargs', which point
  10            to the non-duplicated strings in 'argv' directly from the system.
  11   \author  Jordan Lavatai
  12   \date    Aug 2016
  13   ----------------------------------------------------------------------------*/
  14 /* Standard */
  15 #include <errno.h>
  16 /* Posix */
  17 #include <unistd.h> //getopt
  18
  19 int main(int, char*[]);
  20
  21 const char* cargs['Z'] = {0};
  22
  23 extern //bison
  24 void yyparse(void);
  25 extern //lexer.c
  26 int  lexer_init(void);
  27
  28 /* Main entry from terminal
  29    parses the command line and kicks off recursive scanning
  30 */
  31 int main
  32 ( int   argc,
  33   char* argv[]
  34 )
  35 #define MAXERR "-%c allows at most " #MAX_STR_LEN " input characters", opt
  36 #define USAGE  "Usage: %s [-r root]\n", argv[0]
  37 #define DONE   -1
  38 { int   opt;
  39
  40  getopt:
  41   switch (opt = getopt(argc, argv, "r:o:"))
  42   { case DONE:
  43       break;
  44     case 'r' :
  45     case 'o' :
  46       if (strnlen(optarg, MAX_STR_LEN) != MAX_STR_LEN)
  47         { cargs[opt] = optarg;
  48           goto getopt;
  49         }
  50       fprintf(stderr, MAXERR);
  51     default :
  52       fprintf(stderr, USAGE);
  53       exit(EXIT_FAILURE);
  54   }
  55   if (lexer_init())
  56     { perror("lexer");
  57       exit(EXIT_FAILURE);
  58     }
  59   yyparse();
  60   exit(EXIT_SUCCESS);
  61 }
  62