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 #include "ir.h"
  24
  25 #define DEFAULT_PAGESIZE 4096
  26 const char** cargs;
  27 long  sys_pagesize;
  28
  29 int main(int, char*[]);
  30
  31 extern //lexer.c
  32 int  lexer_init(void);
  33 extern //scanner.c
  34 int  scanner_init(void);
  35 extern //scanner.c
  36 void scanner_quit(void);
  37 extern //scanner.c
  38 int  scanner_scanpath(char const*);
  39 extern //ir.c
  40 int  ir_init(void);
  41 extern //ir.c
  42 int  ir_linker(void);
  43 extern //ir.c
  44 int  ir_condenser(void);
  45 extern
  46 void     ir_test(void);
  47
  48 /* Main entry from terminal
  49    parses the command line and kicks off recursive scanning
  50 */
  51 int main
  52 ( int   argc,
  53   char* argv[]
  54 )
  55 #define $($)#$ //stringifier
  56 #define MAXSTR 255
  57 #define MAXERR "-%c allows at most " $(MAXSTR) " input characters\n", opt
  58 #define OPTS  "d:o:h-"
  59 #define USAGE "Usage %s [-d dir_root][-o output_file][-h]\n", argv[0]
  60 #define USAGE_LONG                                      \
  61   "\tOptions:\n"                                        \
  62   "\t\t-d\tRoot directory to parse from \t[./]\n"       \
  63   "\t\t-o\tOutput filename \t\t[a.asspak]\n"            \
  64   "\t\t-h\tPrint this help\n"
  65 #define DONE   -1
  66 #define SCANPATH (cargs['d'] ? cargs['d'] : "./")
  67 { int   opt;
  68   cargs = (const char**) malloc('Z');
  69  getopt:
  70   switch (opt = getopt(argc, argv, OPTS))
  71   { case 'd' :
  72     case 'o' :
  73       if (strnlen(optarg, MAXSTR) != MAXSTR)
  74         { cargs[opt] = optarg;
  75           goto getopt;
  76         }
  77       fprintf(stderr, MAXERR);
  78     default :
  79       fprintf(stderr, USAGE);
  80       exit(EXIT_FAILURE);
  81     case 'h' :
  82       printf(USAGE);
  83       printf(USAGE_LONG);
  84       exit(EXIT_SUCCESS);
  85     case DONE:
  86       break;
  87   }
  88   if ((sys_pagesize = sysconf(_SC_PAGESIZE)) == 0)
  89     sys_pagesize = DEFAULT_PAGESIZE;
  90   if (ir_init())
  91     { perror("init");
  92       free(cargs);
  93       exit(EXIT_FAILURE);
  94     }
  95   if (scanner_scanpath(SCANPATH))
  96     { perror("scanner");
  97       free(cargs);
  98       exit(EXIT_FAILURE);
  99     }
 100   ir_test();
 101   ir_linker();
 102   ir_condenser();
 103   free(cargs);
 104   exit(EXIT_SUCCESS);
 105 }