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 yypstate* apc_pstate;
  28 yycstate* apc_cstate;
  29
  30 int main(int, char*[]);
  31
  32
  33 extern //bison
  34 int yyparse(void);
  35 extern //lexer.c
  36 int lexer_init(void);
  37 extern
  38 int scanner_init(void);
  39 extern
  40 int scanner();
  41 extern //ir.c
  42 int ir_init(void);
  43
  44 extern //apc/parser.tab.c
  45 YYSTYPE yylval;
  46 extern
  47 yycstate* yycstate_new(void);
  48
  49 extern //lexer.c
  50 int  lexer(void);
  51
  52 /* Main entry from terminal
  53    parses the command line and kicks off recursive scanning
  54 */
  55 int main
  56 ( int   argc,
  57   char* argv[]
  58 )
  59 #define $($)#$ //stringifier
  60 #define MAXSTR 255
  61 #define MAXERR "-%c allows at most " $(MAXSTR) " input characters\n", opt
  62 #define OPTS  "d:o:h-"
  63 #define USAGE "Usage %s [-d dir_root][-o output_file][-h]\n", argv[0]
  64 #define USAGE_LONG                                      \
  65   "\tOptions:\n"                                        \
  66   "\t\t-d\tRoot directory to parse from \t[./]\n"       \
  67   "\t\t-o\tOutput filename \t\t[a.asspak]\n"            \
  68   "\t\t-h\tPrint this help\n"
  69 #define DONE   -1
  70 { int   opt;
  71
  72  getopt:
  73   switch (opt = getopt(argc, argv, OPTS))
  74   { case DONE:
  75       break;
  76     case 'd' :
  77     case 'o' :
  78       if (strnlen(optarg, MAXSTR) != MAXSTR)
  79         { cargs[opt] = optarg;
  80           goto getopt;
  81         }
  82       fprintf(stderr, MAXERR);
  83     default :
  84       fprintf(stderr, USAGE);
  85       exit(EXIT_FAILURE);
  86     case 'h' :
  87       printf(USAGE);
  88       printf(USAGE_LONG);
  89       exit(EXIT_SUCCESS);
  90   }
  91   if ((sys_pagesize = sysconf(_SC_PAGESIZE)) == 0)
  92     sys_pagesize = DEFAULT_PAGESIZE;
  93
  94   apc_pstate = yypstate_new();
  95   apc_cstate = yycstate_new();
  96
  97   if (scanner_init() || ir_init())
  98     { perror("init");
  99       exit(EXIT_FAILURE);
 100     }
 101   scanner();
 102
 103   exit(EXIT_SUCCESS);
 104 }
 105