src/bin/tools/apc.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 <stdio.h>  //print
  16 #include <errno.h>  //errors
  17 #include <string.h> //strnlen
  18 /* Posix */
  19 #include <stdlib.h> //exit
  20 #include <unistd.h> //getopt
  21 /* Internal */
  22 #include <apc/parser.tab.h> //bison
  23
  24 const char* cargs['Z'] = {0};
  25
  26 int main(int, char*[]);
  27
  28 extern //bison
  29 int yyparse(void);
  30 extern //lexer.c
  31 int  lexer_init(void);
  32
  33 extern //apc/parser.tab.c
  34 YYSTYPE yylval;
  35 extern //lexer.c
  36 int  lexer(void);
  37
  38 /* Main entry from terminal
  39    parses the command line and kicks off recursive scanning
  40 */
  41 int main
  42 ( int   argc,
  43   char* argv[]
  44 )
  45 #define $($)#$ //stringifier
  46 #define MAXSTR 255
  47 #define MAXERR "-%c allows at most " $(MAXSTR) " input characters\n", opt
  48 #define USAGE  "Usage: %s [-r root]\n", argv[0]
  49 #define DONE   -1
  50 { int   opt;
  51
  52  getopt:
  53   switch (opt = getopt(argc, argv, "r:o:"))
  54   { case DONE:
  55       break;
  56     case 'r' :
  57     case 'o' :
  58       if (strnlen(optarg, MAXSTR) != MAXSTR)
  59         { cargs[opt] = optarg;
  60           goto getopt;
  61         }
  62       fprintf(stderr, MAXERR);
  63     default :
  64       fprintf(stderr, USAGE);
  65       exit(EXIT_FAILURE);
  66   }
  67   if (lexer_init())
  68     { perror("lexer");
  69       exit(EXIT_FAILURE);
  70     }
  71   yyparse();
  72   exit(EXIT_SUCCESS);
  73 }
  74