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 [-d dir_root][-o output_file][-h]\n", argv[0]
  49 #define USAGE_LONG                                      \
  50   "\tOptions:\n"                                        \
  51   "\t\t-d\tRoot directory to parse from \t[./]\n"       \
  52   "\t\t-o\tOutput filename \t\t[a.asspak]\n"            \
  53   "\t\t-h\tPrint this help\n"
  54 #define DONE   -1
  55 { int   opt;
  56
  57  getopt:
  58   switch (opt = getopt(argc, argv, "d:o:h-"))
  59   { case DONE:
  60       break;
  61     case 'd' :
  62     case 'o' :
  63       if (strnlen(optarg, MAXSTR) != MAXSTR)
  64         { cargs[opt] = optarg;
  65           goto getopt;
  66         }
  67       fprintf(stderr, MAXERR);
  68     default :
  69       fprintf(stderr, USAGE);
  70       exit(EXIT_FAILURE);
  71     case 'h' :
  72       printf(USAGE);
  73       printf(USAGE_LONG);
  74       exit(EXIT_SUCCESS);
  75   }
  76   if (lexer_init())
  77     { perror("lexer");
  78       exit(EXIT_FAILURE);
  79     }
  80   yyparse();
  81   exit(EXIT_SUCCESS);
  82 }
  83