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, sysconf
  21 /* Internal */
  22 #include "parser.tab.h" //bison
  23
  24 #define DEFAULT_PAGESIZE 4096
  25 const char* cargs['Z'] = {0};
  26 const long  sys_pagesize;
  27
  28 int main(int, char*[]);
  29
  30 extern //bison
  31 int yyparse(void);
  32 extern //lexer.c
  33 int lexer_init(void);
  34 extern //ir.c
  35 int ir_init(void);
  36
  37 extern //apc/parser.tab.c
  38 YYSTYPE yylval;
  39 extern //lexer.c
  40 int  lexer(void);
  41
  42 /* Main entry from terminal
  43    parses the command line and kicks off recursive scanning
  44 */
  45 int main
  46 ( int   argc,
  47   char* argv[]
  48 )
  49 #define $($)#$ //stringifier
  50 #define MAXSTR 255
  51 #define MAXERR "-%c allows at most " $(MAXSTR) " input characters\n", opt
  52 #define OPTS  "d:o:h-"
  53 #define USAGE "Usage %s [-d dir_root][-o output_file][-h]\n", argv[0]
  54 #define USAGE_LONG                                      \
  55   "\tOptions:\n"                                        \
  56   "\t\t-d\tRoot directory to parse from \t[./]\n"       \
  57   "\t\t-o\tOutput filename \t\t[a.asspak]\n"            \
  58   "\t\t-h\tPrint this help\n"
  59 #define DONE   -1
  60 { int   opt;
  61
  62  getopt:
  63   switch (opt = getopt(argc, argv, OPTS))
  64   { case DONE:
  65       break;
  66     case 'd' :
  67     case 'o' :
  68       if (strnlen(optarg, MAXSTR) != MAXSTR)
  69         { cargs[opt] = optarg;
  70           goto getopt;
  71         }
  72       fprintf(stderr, MAXERR);
  73     default :
  74       fprintf(stderr, USAGE);
  75       exit(EXIT_FAILURE);
  76     case 'h' :
  77       printf(USAGE);
  78       printf(USAGE_LONG);
  79       exit(EXIT_SUCCESS);
  80   }
  81   if ((sys_pagesize = sysconf(_SC_PAGESIZE)) == 0)
  82     sys_pagesize = DEFAULT_PAGESIZE;
  83   if (lexer_init() || ir_init())
  84     { perror("init");
  85       exit(EXIT_FAILURE);
  86     }
  87   yyparse();
  88   exit(EXIT_SUCCESS);
  89 }
  90