src/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> //strndupa
  18 /* Posix */
  19 #include <stdlib.h> //exit
  20 #include <unistd.h> //getopt
  21 /* Internal */
  22 #include "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 extern //ir.c
  33 int ir_init(void);
  34
  35 extern //apc/parser.tab.c
  36 YYSTYPE yylval;
  37 extern //lexer.c
  38 int  lexer(void);
  39
  40 /* Main entry from terminal
  41    parses the command line and kicks off recursive scanning
  42 */
  43 int main
  44 ( int   argc,
  45   char* argv[]
  46 )
  47 #define $($)#$ //stringifier
  48 #define MAXSTR 255
  49 #define MAXERR "-%c allows at most " $(MAXSTR) " input characters\n", opt
  50 #define OPTS  "d:o:h-"
  51 #define USAGE "Usage %s [-d dir_root][-o output_file][-h]\n", argv[0]
  52 #define USAGE_LONG                                      \
  53   "\tOptions:\n"                                        \
  54   "\t\t-d\tRoot directory to parse from \t[./]\n"       \
  55   "\t\t-o\tOutput filename \t\t[a.asspak]\n"            \
  56   "\t\t-h\tPrint this help\n"
  57 #define DONE   -1
  58 { int   opt;
  59
  60  getopt:
  61   switch (opt = getopt(argc, argv, OPTS))
  62   { case DONE:
  63       break;
  64     case 'd' :
  65     case 'o' :
  66       if (strnlen(optarg, MAXSTR) != MAXSTR)
  67         { cargs[opt] = optarg;
  68           goto getopt;
  69         }
  70       fprintf(stderr, MAXERR);
  71     default :
  72       fprintf(stderr, USAGE);
  73       exit(EXIT_FAILURE);
  74     case 'h' :
  75       printf(USAGE);
  76       printf(USAGE_LONG);
  77       exit(EXIT_SUCCESS);
  78   }
  79   if (lexer_init() || ir_init())
  80     { perror("init");
  81       exit(EXIT_FAILURE);
  82     }
  83   yyparse();
  84   exit(EXIT_SUCCESS);
  85 }
  86